How to use taphole filler

refractory suppliers

During the period of electric furnace smelting, the taphole filler of the contact part with the molten steel produced the sintering layer, thus preventing the molten steel from penetrating downwards. refractory brick manufacturers The non sintered taphole filler under the sintering layer can flow smoothly when the steel plate is opened by the tapping, and the sintering layer is broken by the pressure of the molten steel to achieve the purpose of automatic pouring. When the electric furnace is finished tapping, when the stuffing is put into the EBT platform, the refractory material taphole filler can flow out of the tapping hole automatically, and the molten steel flows into the ladle. refractory brick china The automatic casting rate can reach more than 90%.

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The selection or refractory material for silicon package

refractory

At present, the most common silicon package is a ton of garden cone silicon package, the diameter of 1.2-1.5 meters, the mouth diameter of about meters.

Although this silicon package with refractory material is not much, but it is very particular about. General silicon package with two castables, one is silicon package with corundum refractory castable, used in the silicon package pouring hole site. One is the silicon package with high-performance castable, used in the package along the silicon package parts.
Silicon package pouring hole, high temperature, impact larger. Optional silicon package special corundum castable, this castable has excellent high temperature performance, and anti-erosion, high temperature state volume stability, when used in silicon package can be cast with corundum castable prefabricated parts (prefabricated general mouth Diameter of 250-300cm height, the mouth diameter of about 150cm. Park cone). This easy to use excellent construction.
Silicon package with high-performance castable silicon package castable silicon package corundum castable 1 ton of silicon package refractory
Silicon cladding is made of refractory alumina brick, refractory brick suppliers thickness of about 150cm. The total weight of about 1 ton.
Silicon package along the 10-15 cm at the silicon package with high castable, high-performance castable wear resistance, thermal shock, high strength, heat resistance and strong features, so the package along the edge of high performance Casting material, but also cheap, extremely reasonable.
Although the small package of silicon material is small, but very particular about, such as the wrong choice of refractory brick manufacturers. It is a waste of materials, a waste of costs. Therefore, the choice of materials, it is recommended or use the above materials as well. In this way, that is economical and practical.


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The impact of sintering temperature and holding time for refractory materials

refractory

Sintering temperature and holding time is an important external sintering refractory material. With the increase of temperature, the vapor pressure of the material increases, the diffusion coefficient increases, and the viscosity of the liquid phase decreases, thus facilitating the process of material transfer such as evaporation-aggregation, diffusion of ions and vacancies, particle rearrangement, viscous and plastic flow. So that sintering speed. Prolonging the sintering time can also promote the completion of sintering. However, in the latter stage of sintering, unreasonably prolonging the sintering time can sometimes aggravate the secondary recrystallization, but can not obtain a sufficiently dense product.
The firing temperature of refractory products should be controlled within the sintering temperature range, at this temperature should maintain the appropriate sintering time to complete the sintering, if continue to increase the temperature deformation of the body.

The impact of the atmosphere:
Atmosphere directly affects the firing effect and product quality. Burning atmosphere can be divided into general oxidizing atmosphere, neutral atmosphere and reducing atmosphere. Different materials for the green body should choose a different atmosphere to ensure the physical and chemical reactions in the body smoothly. At the end of sintering, the atmosphere (the type of gas in the pores) has an influence on the sintering when the pores are closed. Study of Al2O3 sintering found that when the gas solubility in the lattice is small and slow diffusion, the isolated pores is not easy to discharge from the body. For example, Al2O3 is sintered in argon and air. On the contrary, when the diffusion rate of gas in the lattice is fast enough, the atmosphere has no effect on the sintering end. If the atmosphere to control the defect structure has a certain role, you can speed up the proliferation and conducive to sintering.

It must be pointed out that the influence of firing atmosphere depends on the material composition, sintering conditions, the type and amount of additives, and other factors. Therefore, specific analysis should be conducted for different temperatures.

In the actual sintering process, the impact of the above factors are interrelated and mutually restrictive. The factors that play a major role under different conditions may be different.


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Cement rotary kiln refractory materials magnesium aluminum spinel brick

refractory materials

Magnesia-alumina spinel brick is high purity magnesia and pre-synthesized magnesium spinel as the main 6 material, the reasonable grading, high pressure molding, high temperature firing obtained products. Its characteristics are high, high strength, corrosion resistance, low coefficient of thermal expansion, thermal shock resistance, is the ideal transition from cement transition zone refractory materials for sale.
Magnesia-alumina spinel production of ingredients in the amount of magnesium aluminate spinel is not more good female, with the increase in the amount of spinel thermal shock resistance becomes better, but due to mismatch expansion will make g degrees (especially anti-fracture Strength) to Alz05 as the standard, the product A120: should not be large; 15% -20%, preferably 10% -18%, which is consistent with the experimental data of magnesia aluminum brick.
Magnesium aluminum tip stone brick main impurity is so z, should not exceed 1.5%.
Over the past twenty years, people have been seeking to replace magnesia-chrome bricks in addition to six valence-polluting technology, first of all, looking to the periclase spinel brick. The initial report was optimistic but gradually came the different message from the cement plant: "The kiln skin is not found." The eutectic temperature of the original spinel brick 4 cement is close to (slightly lower) the firing temperature of the cement. This is fatal, so spinel brick kiln lining in our cement kiln back to 15 ~ 20m to reach the transition zone, occupy the original high-alumina brick or ordinary magnesia-chrome brick position.
The academic community agreed that re20J affect the product's resistance to atmospheric changes, spinel brick in the transition zone is better than magnesia-chrome brick, one of the explanations is k205 content Below the M-K line, however, the addition of 4% re20J to spinel bricks improves the brittleness of bricks. When the expansion rate of only 113%, flexural strength 12MPa, will be. 05P kiln 38-40m area use 8 months wear 30mm, and commonly used spinel brick wear amount is 80 "120mm, and said that this high-speed rail bricks for burning belt can hang the kiln skin.
Spinel thermal shock resistance, anti-B 'alkali corrosion, acid gas erosion resistance, anti-atmospheric ability to change are better than ordinary magnesia chrome brick, but on the cement rotary kiln transition belt and discharge belt with refractory brick suppliers, Should also have a small thermal conductivity, good wear resistance, anti-shear fracture capacity, which determines the availability of spinel brick.
Wear resistance is poor, in the 2500t kiln can run stably for more than 8 months Feng Mao Wei angle.
China periclase spinel brick ingredients, the use of sintered high purity magnesia, mid-range magnesia and synthetic spinel sand (5i020 6% -20%), thermal shock resistance indicators are generally more than 10 times, the best of 2D Times or more. However, the high temperature flexural strength (1400Y, o.5h), roughly 2-3MPa, most products less than 3MPa, which is spinel brick to be improved technology. There are no national standards for the sharp stone blocks used in cement kilns, and all the manufacturing enterprises use each other for reference to form the spinel brick used in China's cement rotary kiln.
Spinel brick has the advantage of good thermal shock resistance, the use of clinker reaction during the spinel can form a thin layer of calcium aluminate protective layer, so that the liquid is not easy to penetrate, anti-spalling performance ratio Direct combination of magnesium chrome brick good. In the cement rotary kiln cooling zone and transition zone service life than the direct combination of magnesia-chrome brick to double. But slightly less resistant to erosion in the direct combination of magnesia-chrome brick. At the same time, spinel brick easy hydration, thermal conductivity larger kiln cylinder temperature than the use of direct combination of magnesia-chrome brick high.

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Coke oven repair with refractory materials

refractory materials

Coke oven repair with refractory materials
Coke oven refractory masonry minor repair is the preventive maintenance of coke oven masonry and routine repair. The project is small, generally do not stop production conditions, by the workshop repair personnel repair masonry defects. Ovens for minor repairs in coke ovens include: repair of gaps, cracks and holes, compacting of gaps between masonry and equipment, reworking of loose iron pieces embedded in masonry, replacement of adjustment equipment, opening of blocked ramps and burners Brick, replace the stove at the bottom with refractory brick, repair coke oven door refractory lining brick. Primary repair of coke oven masonry wet repair, semi-dry repair and dry repair three types.
Repair parts by the repair items are:
① roof area, including the top surface of the furnace roof sealing and renovation, flue cleaning, ramp opening, burner brick and conditioning brick replacement, stopper brick gunning and riser refractory lining material brick replacement.
③ Taiwan, including stoves, furnace walls and walls of the front wall to resist various types of damage to the repair and spraying, the furnace at the end of the refractory brick suppliers floor and door repair and replacement of furnace linings, furnace shoulder seam repair and so on. )
③ regenerator area includes both sides of the flue corridor and basement. Repair projects have refractory brick gas pipeline and dredging, sealing walls, gas pipe fittings and exchange switch and the furnace at the junction of the seal, a small amount of replacement and replacement of lattice bricks, regenerator wall furnace renovation of the furnace head and so on.
1. Wet repair wet method of making up mainly by gunning and wiping, these methods are used tools and operations are relatively simple, and the use of a wider range, regardless of hot, cold, or carbonization chamber walls, fire fighters Internal, regenerative room, ramp and furnace roof can be used in all parts. The main disadvantage of wet-fill furnaces is that while repairing old defects, they can cause new damage to the masonry.
(1) Spray gun Put the prepared mud into the shotcrete machine, use the pressure of the compressed air to press the mud out of the shotcrete machine and spray it on the damaged wall to repair the damaged parts. Spray a wide range of applications, regardless of the size of the cracks, peeling, Ma face, depression, etc., can be sprayed, can complement the red hot wall, but also make up for the lower temperature of the roof and regenerator area. The advantages are: simple operation, high speed and high efficiency, wide range of applications, can make the formation of scattered slurry sprayed on the masonry, the general requirements of the thickness of each layer of pulp is not more than 7mm, after the first layer of dry Second floor. The disadvantages of this method are as follows: the water content of mud is as high as 40%. When the mud touches the wall, the pressure of water vapor will affect the bonding between the mud and the wall due to the violent evaporation of water. At the same time, the sudden cooling of red-hot wall due to the mud with large water content caused the cracking of silica brick masonry and directly affected the life of the coke oven. Therefore, this method is currently not used, only for use with wiping or wiping more difficult to use.
(2) wiping first with a shovel shovel furnace wall to eliminate defects in the site of deposition of carbon, and compressed air purge, and then to be rubbed spray a layer of 3 ~ 5mm thick mud, and then use a large shovel to wipe the mud Press the wall of the defect site, stay for a few seconds and then slide the trowel along the parallel direction of the wall, each time the wall of the mud should not be too thick, so as not to mud due to gravity and fall off, mud After adhering to the wall, use a spatula to wipe the wall with the wiping layer.
Mud fill with mud water content than the mud is much smaller, so the side effects of masonry is relatively small. Wipe up is not suitable for smaller cracks, but for large cracks, holes, etc. make up quickly. Therefore, wiping is the current wet method of making up the main means. Wiping operation technology is more difficult to grasp, wiping well, hanging time can be long, therefore, need to repair hot in practice constantly sum up experience and find good methods of operation, in order to prolong a repair linked to the time.
2. Wet method of making up the mud
There are two main types of wet-fill muds; one is a siliceous or clay-based mud with water glass as the binder; the other is a clay mud with phosphate or phosphate as the binder. The former was widely used by various coking plants until the 1960s. Each time a subsidy was applied, the time was relatively short, usually two and a half months to one month or so. The latter started in the early 1960s. Due to its long hanging material (about the former 8 to 10 times), it is quickly adopted, instead of water glass mortar.
(1) Silicate Mortar Silicone mortar containing water-based glass absorbs CO2 and precipitates SiO2 gel at room temperature and high temperature. It not only adheres the mud material to the wall to be filled, but also has Higher intensity. In addition, Na2O (or K2O) in water glass can reduce the melting temperature of the clay to make it appear in advance of the liquid phase at high temperatures, and also promote the adhesion of the clay to the furnace wall. The bonding between the water glass gypsum and the wall is a physical combination. As the water in the gypsum is more watery, the water shrinks greatly after it evaporates, and the bond with the wall is not strong, so the hanging time is short.
Water glass preparation of clay fire clay, except for the mechanism of making up the same with the water glass of silicon fire mud, water glass at high temperatures, clay and clay brick can make kaolinite rapid formation of mullite crystals, thereby increasing the mud Strength and stability. However, clay prepared by using water glass must be used promptly. Otherwise, the SiO2 gel precipitated from water glass will lose its bonding ability with Al2O3. In the water glass mortar, by adding a certain amount of sodium carbonate (Na2CO3), the mud can appear early in the liquid phase at high temperatures, increasing the bond capacity of the mud.
Borax with a particle size of 0.2mm and talcum powder were mixed at a mass ratio of 3:10 and then mixed with a fine clay clinker powder in a mass ratio of 1: 6, and then prepared with a water glass solution having a density of 1.11 The required consistency. It will be better to use this clay to fill the furnace wall. ?
(2) phosphate cement phosphate (H3PO4) and refractories in aluminum, silicon and other oxides chemical reaction, can generate phosphate cementitious materials. The cementitious material has the advantages of plasticity, low temperature curing, high temperature sintering, high refractoriness, good thermal stability and strong adhesive force. Therefore, it is widely used in the hot repair of industrial furnaces.
In the coke oven repair mortar material, phosphoric acid as a binder clay material, with the most solid combination of silica brick masonry. Because of the action of phosphoric acid and Al2O3 in clay fire clay, a good cementitious material of aluminum phosphate cement is formed, which belongs to a fire-hardening binder that hardens when heated. Al2O3 (about 40%) in clay fire clay does not react with phosphoric acid at room temperature (has a slow action with Al2O3? 2H2O in the clay raw material) and dehydrates at about 200 DEG C to produce aluminum dihydrogen phosphate Al (H2PO4 ) 3 and aluminum phosphate (AlPO4) at 250-280 ° C to form an amorphous substance, which becomes H2 (AlP3O10) at 300-400 ° C and dehydrates to aluminum metaphosphate [Al (PO3) 3] at 500 ° C n, aluminum tetraphosphate [Al (PO3) 3] 4 is formed at 800 ° C, phosphorus pentoxide is partially decomposed and precipitated into cristobalite (AlPO4) at 1000-1200 ° C, while the major part Still tetra-aluminum trimetaphosphate [Al (PO3)
3〕 4, at 1300 ~ 1500 ℃ under the conditions of the reaction is relatively strong, long-term high temperature, AlPO4 will become pure corundum (Al2O3). The aluminum phosphate monobasic and the aluminum metaphosphate produced in the reaction of phosphoric acid and Al2O3 are good gelling materials. They are well integrated with the silica brick wall and gradually sintered to harden, and finally change the square quartz-shaped aluminum phosphate, not only high melting point, but also with a similar wall of silica brick crystal transition. When the temperature changes, it is relatively close to the expansion (or shrinkage) of the silica brick, which reduces the internal stress between the phosphoric acid mud layer and the silica brick wall, so that the repair layer can extend the hanging time.
Since phosphoric acid can work with impurities (MgO, CaO, Fe2O3 and other basic oxides) in clay fire clay at room temperature to form compounds such as magnesium phosphate, calcium phosphate and iron phosphate, the clay material has certain properties at room temperature Sticky. However, when the content of magnesium phosphate in the mud exceeds 1.5%, the mud will lose its plasticity at normal temperature, which is not conducive to the construction work of spraying and wiping. Therefore, it is usually required that the clay in the clay should be less than 0.5% MgO, CaO should be less than 1%, Fe2O3 the smaller the better. SiO 2 (about 50%) in clay fire clay and phosphoric acid at above 260 ° C will form SiO 2 [SiO (PO2) 2). Although SiO 2 and SiO 2 also belong to cementitious material , But they do not have the same crystalline conversion properties as silica bricks, so the bonding to silica bricks is far less than that of aluminum phosphate cementitious materials. Therefore, the current wet repair silica brick coke oven masonry using phosphate - clay mud instead of phosphate - siliceous mud.
Preparation of phosphoric acid-clay clay material: clay fire clay is prepared from clay clinker and raw materials. Clinker does not work with phosphoric acid at room temperature, so the low viscosity is not good for the spray and wipe, but its residual shrinkage is small, strength is good; raw material residual shrinkage, but the porosity is low, but also can improve the mud The adhesion, which is conducive to construction operations.
Clay sprinkler, generally 20% of the raw materials and 80% of the clinker with, and is the use of fine-grained mud; wiping mud with the ratio and size of the plant varies, Anshan Chemical The plant is made with 50% gunning material and 50% particle size less than 3mm clinker; while WISCO coking plant is made of 80% clay clinker with particle size less than 3mm and 20% clay raw material. Spray water content is generally 30% to 40%, while wiping material is about 17%.
Phosphoric acid in the amount of clay in the mud is: each 100kg spray material added to the relative density of 1.25 to 1.3 orthophosphoric acid solution (ie orthophosphoric acid and water diluted) 37 ~ 42kg; each 100kg wadding added relative density of 1.3 ~ 1.4 of orthophosphoric acid solution 26kg.
In the preparation of mud, in order to make full use of phosphoric acid and mud, and discharge the gas generated, the mud stir should be trapped after a day to use. But the test shows that the bonding strength of mud and silica brick decreased significantly with the storage time of the mud, so the mud should not be stored for too long after the modulation so as to prevent the mud from losing its chemical activity.
(3) Plastic Plastic Plastic is often used in the form of wiping and ramming for the repair of various industrial furnaces. Because it still needs to be mixed with liquid gelling agent before use, it still belongs to the type of wet wiping. Plastic materials can be divided into clay, aluminum, corundum, silicon, chromium, zirconium, silicon carbide, etc., of which clay and high aluminum used more generally. Plastic construction facilitation, repair part of the overall good, less gap, wear resistance, thermal stability, slag resistance, impact resistance are better. Its low thermal conductivity, but thermal storage ability.


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Molten steel temperature and carbon corrosion of aluminum-magnesium spinel refractories

refractory materials

With the progress of metallurgical technology, the performance of refractories material also put forward higher requirements. Because aluminum-magnesium spinel refractory material has the advantages of high melting point, low thermal expansion coefficient, thermal shock resistance and slag resistance, it is widely used in electric furnace, refined ladle and skateboard and other major parts. In high temperature conditions, the refractory materials for sale reacts not only with slag and reacts with molten steel, but also has an important effect on the refractory process.

Production practice shows that the molten steel temperature and its carbon mass fraction are the main factors that affect the reaction between refractory and molten steel. Therefore, it is very important to study the effect of molten steel temperature and its mass fraction on the erosion of aluminum-magnesium spinel refractory.

In this paper, Mg-Al spinel refractory brick suppliers were prepared by fused magnesia and fused corundum as raw materials. The effects of molten steel temperature and carbon mass fraction on the erosion of refractory materials were studied by thermodynamic calculation and thermal experiment. The chemical analysis of carbon in molten steel before and after the experiment was carried out, and the microstructure of the refractory suppliers was observed by scanning electron microscope.

(1) Thermodynamics analysis shows that Mg (g) and A1 produced by the reaction of magnesium oxide and aluminum oxide components with carbon in the refractory material with the increase of temperature. o (g) of the equilibrium sub-pressure increases.

(2) The experimental study shows that the erosion index of refractory increases with the temperature of molten steel, especially when the temperature is higher than 1630 ℃, the erosion index of refractory is affected by temperature. The corrosion index of refractory material decreases with the increase of carbon in molten steel when the boron (C) 0.12% of molten steel decreases, thus alleviating the erosion degree of refractory material.

(3) The erosion mechanism of molten steel to spinel refractories can be summarized as follows: First, the carbon and refractory components of molten steel react chemically with eroded refractory materials: secondly. The penetration of molten steel into the refractory material and the analysis of the low melting point phase in the refractory particles reduce the binding force between the refractory particles and exacerbate the degree of damage to the refractory material.

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Performance and application of paraffin refractories

refractories

Paraffin brick products contain a certain amount of acidic substances (quartz variants), semi-acidic, high temperature performance and clay products similar. Wax stone refractory brick manufacturers in addition to the fire resistance of high quality clay brick low (fluctuations in 1670 ~ 1710 ℃), the other indicators can meet the national standards of clay brick. In particular, as the use of the temperature of the most valuable reference to the load softening start temperature, wax stone brick for the 1300 ~ 1430 ℃, significantly higher than the clay refractory brick suppliers. Therefore, where the clay refractory brick china, you can use wax stone brick to replace.
The biggest feature of wax stone products is the use of a slight expansion, is conducive to maintaining the integrity of the masonry, can reduce the slag on the erosion of the joints. In addition, the slag and refractory brick surface contact, can be formed in the refractory materials for sale brick surface 1 ~ 2mm thick viscosity of the large enamel (SiO2 content of the higher silicate melt), can prevent the slag to the brick infiltration , Thereby improving the product's anti-slag erosion ability.


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The requirements of refractory materials for shaft kilns

refractory brick

① high temperature heat loss: refractoriness of not less than 1580 ℃ inorganic non-metallic materials and products called refractory materials. In the kiln under high temperature, do not soften, insoluble; in normal or abnormal circumstances, can maintain a certain structural strength and bulk density stability. This kind of refractory masonry lining of the kiln in order to maintain the normal operation and production.
② anti-acid and alkali chemical erosion: the material in the kiln of the calcination process, to go through a series of complex physical and chemical reactions, different parts of the acid gas or alkaline slag will erode the kiln lining. Especially in the firing zone, the reaction material in the high temperature liquid phase, the chemical effect of refractory material is more intense. So the material can not participate in chemical reactions, does not appear sticky phenomenon.
③ anti-material movement wear: shaft kiln calcination process, the material from top to bottom, from low temperature to high temperature, to the low temperature kept moving. The lining of the inner wall of the kiln body is always subjected to the movement of the material, especially the clinker formed after calcination is stronger and the wear of the lining is more serious. Therefore, masonry in the kiln body of the refractory material must have a strong anti-wear ability.
④ specifications of the size: refractory masonry quality of the kiln calcination process has an important impact. Shaft kiln is not round, calcined easily lead to "partial fire" phenomenon; brick surface uneven, contact is not close, in the kiln bottom position is unstable, due to thermal shock phenomenon will occur loose lining, reduce service life and kiln heat loss Increase and so on. Therefore, the shape and shape of the refractory brick must be standardized and accurate, which is to ensure the quality of the most basic conditions of masonry.

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Refractory materials for cement kilns

refractory brick

1,cement kiln working environment and the requirements of refractory
The new dry cement kiln is a large system. From raw materials preheating, decomposition, to high temperature calcination to produce clinker, until the cooling out of the material, before and after the total length of several hundred meters. And this is only the main system, there are a large auxiliary system, such as ventilation systems, waste heat power generation systems, are at high temperatures, need to protect the refractory material. However, such a large main and auxiliary system in addition to the work in a serious chemical erosive atmosphere, the other conditions are different, the temperature is not only different levels, there are varying degrees of variation and frequency. Force situation is different, have been washed by the air, there are raw clinker wear, there are mechanical stress. The air erosion strength, wear and mechanical stress and the size of the different, the situation is very complex. Therefore, the performance requirements for refractory materials is also very complex. It is not possible to use only one material to meet all requirements. Must use a series of refractory materials. In view of the above situation, cement kiln refractory use environment although vary widely, but in general there are a few common, that is: a serious chemical erosive atmosphere; greater mechanical stress and wear, strong thermal stress. The difference is mainly due to the difference in temperature. The main requirements for refractory materials are: resistance to chemical attack, high strength, wear resistance, thermal shock resistance, different parts of the refractoriness are quite different. If combined with the actual cement company repair work, it is best to early hardening easy early sintering high strength, it would be better.
2,several commonly used refractory performance comparison
Cement kiln refractory castables are the following: Alkaline castables, high-silicon castables, high-alumina castables.
Alkaline castable refers to the magnesium, magnesium aluminum spinel material based on a class of castables. This material is particularly alkaline resistance, the inadequacies of the thermal expansion coefficient is greater, less thermal shock resistance, such as to solve the thermal shock problem, the application effect in the cement kiln is also good.
High siliceous material refers to the alumina content of less than 30% of the aluminum siliceous material, such materials at a certain temperature and kiln materials and kiln gas in the alkali compounds in the surface of the material quickly formed a closed dense protective glaze Layer, to prevent the continued infiltration of alkali, so as to protect the material inside the alkali is no longer continue to attack, the formation of good resistance to alkaline. However, the weakness of such materials is that the soft temperature is low, low strength, poor wear resistance.
Performance of Alkaline Castables for Kiln Kiln
High alumina refractory brick refers to the formation of a class of alumina-based materials. Mainly including a variety of corundum mullite and so on. The common characteristics of these materials are high hardness, high wear resistance, the inadequacies are not alkali, because the alumina and (K, Na) 2O reaction can form β-alumina, resulting in volume expansion, destruction of material structure, when there is Silica material in the presence of nepheline can form, not only volume expansion, and the lower melting point, the use of a significant decline in performance.
3,Analysis of Damage Mechanism of Refractories for Cement Kiln
1: Alkaline peeling
2: Thermal shock cracks and mechanical stress damage
3: wear air erosion material wear
4: damage caused by non-material properties
Construction defects: construction caused by poor performance of the material caused by defects, poor mobility, material segregation, construction cracks, etc.
Maintenance did not meet the process requirements: baking, no sintering strength low auxiliary equipment: mixing machine, tire mold, vibration anchor welding, bandage, structure, set the size of each location
4, high strength and high wear resistance castable performance analysis
1: high strength and high wear resistance analysis: performance from the nature of the material itself. The cast material is made of high-alumina corundum material, corundum we all know that high hardness and high strength of the material, wear resistance is yes. But in the castable only grain wear is useless, but also must be binding agent and the same part of the matrix wear-resistant Caixing. In the matrix is ??added with corundum homogeneous material @ -AL2O3 powder, so the castable overall wear resistance is very good.
2: thermal shock resistance analysis: pure corundum material wear resistance is good, but the thermal shock is poor, but also part of the sio2, to produce part of the mullite, mullite thermal expansion coefficient of only magnesia three One by one, corundum half, coupled with the thermal expansion coefficient of corundum caused by the micro-cracks toughening effect, which improves the thermal shock resistance of the material.
3: alkali-resistant problem solving: If the corundum is also barely alkaline resistance in the past, mullite in alkaline conditions is very unstable. So ordinary high-alumina materials used in the cement kiln is certainly not work. But the high strength and high wear-resistant castable due to the formation of anti-alkaline protective film can be formed on the material, the corundum mullite from the protective effect, so the corundum mullite to maintain its excellent characteristics, but also have a very good Alkali resistance. Therefore, the full satisfaction of the cement kiln on the requirements of refractories.


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Other refractory materials for industrial furnaces

refractory materials

Other industrial furnaces include boilers, gas stoves, heating furnaces. Building materials industry, the use of refractories furnace up, such as calcined cement industrial furnace and glass melting furnace.
Calcined cement rotary kiln working temperature in the firing zone for the 1450 ~ 1500 ℃, masonry subjected to high temperature and alkali erosion, the production of frequent rotation caused by masonry vibration, while the wear and impact of sports load, masonry Laying layer to make the brick temperature fluctuations, so the use of cement masonry with high refractoriness, good alkali resistance, high compressive strength, good thermal stability of refractories. Generally in the firing zone with the use of magnesia bricks or magnesia-alumina bricks, the calcining belt uses good quality high alumina bricks or phosphates high alumina bricks, and other places use clay tiles.
Glass kiln masonry suffered 1600 ~ 1700 ℃ high temperature role, with the material and glass chemical erosion and mechanical action, as well as dust, air erosion and so on. So the refractory material must have the ideal anti-erosion performance, and should avoid the glass in the stones, stripes, bubbles and other defects. According to this requirement glass melting furnace generally use high-quality silica brick, fused zirconia corundum brick, fused α-β corundum brick, thermal storage room using magnesia or magnesia chrome brick. Refractory industrial kiln, according to the calcined raw materials and firing products, common shaft kiln, rotary kiln, inverted flame kiln and tunnel kiln and so on. Shaft kiln masonry is subjected to high temperature and abrasive wear. Therefore, the refractory used should have substantially the same chemical properties as the calcined raw material, the refractoriness suitable for the calcination temperature of the raw material, and the good high temperature volumetric stability, mechanical strength and slag resistance. For example, calcined limestone and clay clinker can be used in clay kiln lining, calcined magnesite and dolomite shaft kiln lining magnesium, calcined bauxite with high alumina brick or high alumina brick.
Rotary kiln masonry due to rotation leaving the masonry vibration, while the movement of the charge also wear and impact masonry, masonry in addition to meet the requirements of the production process, but also should have high strength and wear resistance.
The flame-resistant kiln is affected by the high temperature effect and the scouring effect of the combustion air flow and the abrupt change in the temperature of the kiln cooling. Therefore, the refractory used has high refractoriness and mechanical strength as well as good thermal stability and high temperature volumetric stability Wait. Masonry use of refractory materials and firing products should be consistent, such as firing high-alumina refractory bricks and magnesia brick masonry using high alumina brick, magnesia brick and silicon brick.
Tunnel kiln due to the high temperature of the firing zone, masonry quality requirements. Therefore, the masonry should be used refractory, fire resistance, mechanical strength and load softening temperature are high, high temperature stability and good dimensional dimensions of the refractory material. At the same time the performance of masonry and firing performance should be adapted.

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Refractory materials for induction furnaces

Refractory materials

Refractory materials for induction furnaces:
The furnace lining is usually made of clay brick or ternary high alumina brick masonry. The bottom of the furnace is sometimes the first high-alumina refractory castable watering grass, and then in the high aluminum brick. When the induction furnace capacity is less than 10t, the lining can be made of high alumina refractory castable or refractory ramming material with about Al2O3 content of about 75%. It can also be made of corundum refractory castable or dry vibration material. Stove sensor coil around the lining, the general use of corundum refractory castable as a whole watering or vibration with dry vibration compact. As the type of raw materials and operating conditions are different, the furnace life is also different, the general furnace age of 0.5 to 4 years. In the use of the coil around the coil and other vulnerable parts should be carried out 1 to 5 times minor repair.
Insulation materials for holding furnaces and aluminum tanks:
Aluminum insulation furnace is divided into slot induction furnace, resistance heating pool furnace and gas furnace furnace. The working temperature of such equipment due to lower operating temperature, generally with clay refractory brick and other materials for the lining, also obtained a higher service life.
Refractory material for rotary drums:
The non-working layer of the drum is made of clay or heat-resistant brick or floating brick masonry, and can also be made of lightweight refractory castable with a bulk density of 1.0g / cm3 or made of prefabricated masonry. The working layer is made of dense clay refractory bricks or Al2O3 content of more than 55% of high alumina refractory masonry. Rotor furnace furnace age is generally 300 ~ 500 furnace times. When the addition of salt solvent smelting aluminum, due to increased chemical erosion, the furnace age has decreased.

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Ruizhi Refractory, refractory material, refractory manufacturer, refractory company, refractories: Classification and main properties of high aluminu...

Ruizhi Refractory, refractory material, refractory manufacturer, refractory company, refractories: Classification and main properties of high aluminu...: High Alumina Brick (1) cement kiln with high alumina brick Cement kiln combined with high alumina brick is a high bauxite clinker a...

Advantages and disadvantages of carbon blast furnace refractory material

refractories used in blast furnace

The main carbon refractories used in blast furnace are carbon brick, graphite carbon brick, graphite silicon carbide brick, self-bonding or nitrogen-bonded silicon carbide brick and ramming materials.

(1) Characteristics of carbon refractory for iron making

1) Carbon refractory is the ideal blast furnace refractory lining material, it has the following advantages:

① Carbon refractory  has high refractoriness, it will neither melts nor soften in blast furnace.

② Carbon refractory’s thermal expansion coefficient is small, it has a good volume stability in large temperature range.

③ Carbon-saturated molten iron will not erode carbon brick, in certain cooling condition, the corrosion of the slag to the Carbon lining is also small.

④ Carbon refractory has high thermal conductivity and electrical conductivity, using carbon refractory in the furnace bottom and hearth can make cooler play full performance, thereby extending the life of blast furnace lining material to prevent burning through.

⑤ Carbon refractory has excellent cutting performance, it can be made into shaped products in a very small size to meet the masonry requirements.

2) The biggest drawback of carbon refractories is that carbon and graphite burn in oxidizing atmosphere. When temperature reaches 700℃, carbon refractories begin react with carbon dioxide, and 500℃ it will react with water, and higher than 400℃ it will be oxidized. So for carbon brick’s exposed part, a protective layer should be built.


(2) Silicon carbide brick

Silicon carbide brick is a kind of inert material, it has good thermal conductivity, small expansion coefficient, high temperature strength, small creep deformation, and also silicon carbide brick has good anti-slag, anti-iron scouring and corrosion resistance, besides, silicon carbide’s oxidation resistance is better than carbon materials. The main problem is to find a combination of alkali-resistant metal corrosion. Also useful in nitride-bonded or self-bonded silicon carbide refractories. To extend the life of lower part of furnace, it is better to use silicon carbide brick.


(3) Aluminum carbon brick

Blast furnace aluminum carbon brick uses high quality bauxite and graphite as main raw material, being added a small amount of silicon carbide and additives, using resin as binder, and finally burnt through a compression-molding process. Aluminum carbon brick has the characteristics of high temperature resistance, good thermal conductivity, good alkali resistance, low porosity, small dimensional deviation and low price. It can be used in blast furnace heart, furnace waist, furnace body, iron mouth area, bottom of the furnace and other parts.

The characteristics of unshaped refractory are as follows.

Compared with shaped refractory, due to can celled the complex firing process, unshaped refractory suppliers production process is simpler, it is easy to use. Unshaped refractory has the advantage of plasticity, easy complex product molding, and conducive to mechanized construction, and low cost, and unshaped refractory’s using life is similar to that of refractory bricks. Its refractoriness and chemical stability is close to or can reach the level of similar refractory bricks. Besides, unshaped refractories can be prefabricated into large pieces.

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Advantages and disadvantages of carbon blast furnace refractory material

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Advantages and disadvantages of refractory bricks

refractory bricks

Refractory materials are generally divided into two types, unshaped refractories and shaped refractories. The most widely used refractory bricks are as follows:
1. Dolomite brick
Dolomite brick has good hanging kiln skin performance, good resistance to erosion, but it is easy to hydration and difficult to transport and custody.
2. Magnesia chrome brick
Magnesia chrome brick’s hanging kiln skin performace is good, it is used for firing belt. And its disadvantage is that magnesia chrome refractory brick manufacturers performs not quite well in thermal shock resistance.
3. Phosphate brick
Phosphate brick’s refractoriness is low, but it has high strength and high thermal shock resistance, it is usually used for kiln hood and so on.
4. Silicon carbide brick
Silicon carbide brick has good resistance to high temperature (1800 degrees centigrade, load softening temperature 1620-1640 degrees centigrade). Its thermal expansion coefficient is small, and silicon carbide brick has good resistance to acute cold and hot, good abrasion resistance. Silicon carbide brick is suitable for furnace cooling zone and kiln mouth.
5. Silicon mullite brick
Silicon mullite brick has good thermal shock resistance, high strength and good abrasion resistance. Silicon mullite brick is suitable for furnace transition zone.
6. Spinel brick
Spinel brick is mainly used for transition zone. It has good thermal shock resistance, good anti-reducibility, but its refractoriness is a little low.
7. High alumina brick
High alumina brick’s Al2O3 content is more than 75%, its refractoriness is higher than that of clay brick for sale. High alumina brick has good anti-acid and alkali erosion, it is suitable for cement kiln burning belt, etc. High alumina brick’s using life is long but its price is a little high.
8. Anti-peeling brick
Anti-peeling brick contains a small amount of ZrO. It has excellent resistance to alkaline, good anti-peeling performace and good slag resistance.

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Advantages and disadvantages of refractory bricks
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Advantages and disadvantages of carbon blast furnace refractory material

blast furnace refractory material

The main carbon refractory material used for blast furnace are carbon brick, graphite carbon brick, graphite silicon carbide ladle brick, self-bonding or nitrogen-bonded silicon carbide brick and ramming materials.

(1) Characteristics of carbon refractory materials for iron making

1) Carbon refractory is the ideal refractory for blast furnace refractory lining material, it has the following advantages:

① Carbon refractory  has high refractoriness, it will neither melts nor soften in blast furnace.

② Carbon refractory’s thermal expansion coefficient is small, it has a good volume stability in large temperature range.

③ Carbon-saturated molten iron will not erode carbon brick, in certain cooling condition, the corrosion of the slag to the Carbon lining is also small.

④ Carbon refractory has high thermal conductivity and electrical conductivity, using carbon refractory in the furnace bottom and hearth can make cooler play full performance, thereby extending the life of furnace lining material to prevent burning through.

⑤ Carbon refractory has excellent cutting performance, it can be made into shaped products in a very small size to meet the masonry requirements.

2) The biggest drawback of carbon refractories is that carbon and graphite burn in oxidizing atmosphere. When temperature reaches 700℃, carbon refractories begin react with carbon dioxide, and 500℃ it will react with water, and higher than 400℃ it will be oxidized. So for carbon brick’s exposed part, a protective layer should be built.


(2) Silicon carbide brick

Silicon carbide brick is a kind of inert material, it has good thermal conductivity, small expansion coefficient, high temperature strength, small creep deformation, and also silicon carbide brick has good anti-slag, anti-iron scouring and corrosion resistance, besides, silicon carbide’s oxidation resistance is better than carbon materials. The main problem is to find a combination of alkali-resistant metal corrosion. Also useful in nitride-bonded or self-bonded silicon carbide refractories. To extend the life of lower part of furnace, it is better to use silicon carbide brick.


(3) Aluminum carbon brick

Blast furnace aluminum carbon brick uses high quality bauxite and graphite as main raw material, being added a small amount of silicon carbide and additives, using resin as binder, and finally burnt through a compression-molding process. Aluminum carbon brick has the characteristics of high temperature resistance, good thermal conductivity, good alkali resistance, low porosity, small dimensional deviation and low price. It can be used in blast furnace heart, furnace waist, furnace body, iron mouth area, bottom of the furnace and other parts.

The characteristics of unshaped refractory are as follows.

Compared with shaped refractory, due to can celled the complex firing process, unshaped refractory suppliers production process is simpler, it is easy to use. Unshaped refractory has the advantage of plasticity, easy complex product molding, and conducive to mechanized construction, and low cost, and unshaped refractory’s using life is similar to that of refractory bricks. Its refractoriness and chemical stability is close to or can reach the level of similar refractory bricks. Besides, unshaped refractories can be prefabricated into large pieces.

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Advantages and disadvantages of carbon blast furnace refractory material
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Grade and characteristics of high alumina brick

high alumina bricks

Aluminum oxide (Al2O3) content higher than 48% of alumina silicate refractory products. An alumina content of more than 48% of a neutral refractory material. Of alumina or other high alumina content of raw materials by forming and calcination. High thermal stability, Refractoriness above 1770 ℃, Slag resistance good, used for  the lining of masonry furnace, glass furnaces, cement rotary kiln, etc.

Alumina bricks is a refractory materials, the main ingredient of such a refractory brick is AL2O3. Such as Al2O3 content higher than 90%, called corundum brick. Due to the different resources, national standards are not entirely consistent. European countries such as high alumina refractories prescribed limit of 42% Al2O3 content. In China, according to the high alumina bricks Al2O3 content is usually divided into three classes: Ⅰ Grade ──Al2O3 content> 75%;  Ⅱ Grade──Al2O3 content 60 ~ 75%; Ⅲ Grade ──Al2O3 content 48 to 60%.

Soft high load, low creep high alumina brick is a premium alumina, fused alumina, fused mullite refractory materials as the main raw material. The product has a small temperature creep, corrosion resistance, good thermal shock resistance, etc., suitable for large and medium-sized stove, it is required for our new high-quality stove, imports of high-grade refractory localization open next Road to Success.

Characteristic as follows:

a, refractoriness; high alumina bricks refractoriness are higher than clay and semi-silica brick refractoriness up to 1750 ~ 1790 ℃, belonging to high-grade refractory.

b, load softening temperature; high aluminum products because of high Al2O3, less impurities, less fusible vitreous formed, so load softening temperature is higher than the clay brick, but not formed mullite crystalline , so load softening temperature silica brick is still not high.

c, slag resistance; Al2O3 in alumina bricks are more close to neutral refractories, resistant to erosion of acid and alkaline slag slag, because it contains SiO2, so resistance to alkaline slag ratio of acid slag ability weaker.

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Grade and characteristics of high alumina brick
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Corundum brick introduction

Corundum brick

Alumina content of corundum brick is more than 90%, it is refractory material using corundum as the main crystalline phase. High cold crushing strength (up to 340MPa), high refractoriness under load. Good chemical stability, strong resistance to acid or alkaline slag, metal, and glass liquid. Corundum brick can be divided into two kinds refractory brick, namely sintered corundum brick and fused corundum brick. It can use sintered alumina and fused corundum as raw materials, produced by sintering method. It can also be made of phosphoric acid or other binders into non -fired corundum refractory brick. Refractory Suppliers corundum bricks is mainly used in blast furnaces, vod furnaces, blast furnaces, water heaters, glass furnaces and petrochemical furnaces.

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Corundum brick introduction

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Purpose and related properties of magnesia brick

Magnesia Brick

The main components of the magnesia brick：

The magmesia bricks' main composition is magnesia, and the main crystal is periclase, accounting for 80% of the magnesia bricks quality - 90%, its matrix compound for magnesium, magnesium aluminate spinel ferrite, magnesium olivine, calcium magnesium olivine, etc.

The classification of magnesia brick:

Magnesia bricks generally divided into sintered magnesia refractory brick and chemical combination of two kinds of magnesia bricks. And sintering temperature of high purity magnesite bricks, because the periclase grains, direct contact is called direct combination of magnesite bricks; Electric fused magnesia as raw material made of brick is called reunited fused magnesia brick.

The uses of the magnesite brick:

Because of the high temperature performance is good, the alkaline slag resistance is strong, so the magnesia bricks properties widely used in steel industry steelmaking furnace lining, the ferroalloy fiber cable furnace, mixer; Non-ferrous metallurgical industry furnace, such as copper, lead, zinc, tin, lining; Building materials industry kiln; Glass industry body and heat exchanger regenerator grid; refractory material industry of high temperature calcination kiln, shaft kiln, tunnel kiln, etc.

The important thing:

While the high-temperature calcined magnesite raw materials and products are, but it still has the hydration. Magnesite brick hydration resistance ability at high temperature is lower. So should pay attention to waterproof under any circumstances.

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Purpose and related properties of magnesia brick
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Dolomite brick and magnesia dolomite brick

Dolomite brick and magnesia dolomite brick

The main component of dolomite is calcium magnesium carbonate. Mohs hardness (MOH) is between 3.5 and 4.
 
Dolomite bricks is made as refractory products from calcined dolomite sand. Generally refractory materials dolomite brick has more than 40% CaO, more than 35% MgO and some SiO2, Al2O3, Fe2O3 and some other impurities. The ratio of CaO/MgO in natural dolomite is little large. If the ratio of CaO/MgO is less than 1.39, it will be called magnesite dolomite brick.

In China, Chinese mainly use resin bonded dolomite refractory bricks and resin bonded magnesite dolomite brick for converter furnace . Some factories use light burning oil and oil fired magnesia refractory products for sale dolomite brick in easily damaged part. In Western Europe and Japan, people usually use resin bonded and oil fired dolomite brick and magnesite material dolomite brick for their converter furnace. Besides, magnesite dolomite bricks also can be used for lining of some refining furnaces.

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Dolomite brick and magnesia dolomite brick
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The maintenance of induction furnace - continuous smelting and repair

induction furnace refractory lining materials

1.Continuous furnace
To reduce the repeated heat that caused by quenching refractory material for induction furnace lining cracking, continuous furnace for the extension of lining life is very important, it has caused enough attention of many users. If can't continuous use, intermediate frequency furnace in after a single use, want to join metals refractory material in furnace burden, and cover the furnace cover, it can not only give metal furnace refractory induction furnace charge preheating, also can prevent the lining cracks caused by rapid cooling.

2.The repair
(1) The intermediate frequency furnace to about 20 heats then need to tear down all of my throat opening, purpose is to check whether the refractory products induction furnace lining is drill iron, and check the dry induction furnace loosening clearance. To repair the oven, it is best to high metal front ring, and pay special attention to the old and new interface should be cleaned up. During the next furnace operation, it should open first time below the fettling interface, and so on.
(2) The refractory suppliers induction furnace mouth and throat opening is often slagging, impact erosion and burden, it need constant maintenance and repair, to ensure the normal dimensions of intermediate frequency furnace.

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The maintenance of induction furnace - continuous smelting and repair

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How to identify bentonite

Bentonite use montmorillonite as the main mineral composition of nonmetallic minerals refractory raw material.Bentonite use montmorillonite as the main mineral composition of nonmetallic minerals refractory raw material

Bentonite use montmorillonite as the main mineral composition of nonmetallic minerals refractory material raw material.Bentonite use montmorillonite as the main mineral composition of nonmetallic minerals refractory raw material, it’s also called spot to take off the rock. It’s the main mineral composition of montmorillonite, which content in 85-90%, some properties of bentonite clay are also determined by the montmorillonite. It can display a variety of color, such as yellow, green, gray, white, and so on. It can be dense patches, also be used for the loose soil, you have slippery feeling by hand grinding, small block water volume swell after several times to 20-30 times, are suspended in the much water, paste in the little water. The properties of the montmorillonite based on its chemical composition and internal structure.


To the naked eye, the identification of a high quality of refractory products bentonite is pure white, generally also have gray or pale yellow white, often because of the suction or contains impurities and was weak green, weak, rosy color, etc. Dried still is pure white, gray or pale yellow white. With the hand break after cross section is uneven, and frozen gel. Have oily luster, touching the slippery feeling. Can swell, good can become colloid. If after long-term dry moisture loss, it can become incompact again. Bentonite by a strong force of ion exchange, so it will adsorption or absorption of all sorts of color. It is mixed with oil, can make the oil glossy. Its fine powder and water suspension, dispersion (divergence) is very good, not easy to sink in. Natural bentonite clay powder type, mainly by the montmorillonite relative content is divided into the type of cation that calcium, sodium, hydrogen, lithium montmorillonite, etc., which is given priority to with calcium montmorillonite clay called calcium base bentonite.

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How to identify bentonite

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New trends of China refractory materials

New trends of China refractory materials

Refractory industry, a serious excess capacity is more prominent in the current situation. Therefore, we must resolutely control the production, firmly grasp the domestic and abroad markets. China is a large consumer of refractory material, refractory brick suppliers consumption accounts is about 60% of the total global consumption, is still the leading market for refractories. Therefore, no matter how the economic situation changes, the domestic market is still a large market for refractory consumption. At the same time, refractory production need to expand the international market.

Chinese refractory products exported to more than 150 countries and regions. It is noteworthy that Vietnam, Indonesia, the demand of refractory brick china is increasing. In 2016, the export volume of alkaline refractory materials up to 877,600 tons. refractory company  Silicate Alumina refractory material up to 662,400 tons. In this regard, refractory production and export enterprises need to stabilize the existing export market, at the same time, tracking changes of the international market timely, and further expand the market space, increase exports.

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New trends of China refractory materials

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Advantages and application of ladle covering agent

Advantages and application of ladle covering agent

Ladle covering agent adopts the composite carbon, free carbon technology to improve itself refractoriness, which makes this products with longer insulation time, small capacity, refractory company  good spread porosity, and small termal conductivity, and the net rate is even more than 90%. Also, dust float rate is small, and this refractory material don't bond to the furnace lining, especially for those high alkaline magnesia based, calcium magnesia based covering agent. ladle refractories covering agents have good effect in absorbing impurity for the alkaline magnesia and magnesia calcium type furnace lining in the processs of casting super low carbon clean steel, thus to improve the slag's stability and refractory brick china guarantee the steel quality.

Features of ladle covering agents:
1. Insulation effect is good, the molten steel temperature drop is less than 0.5 ℃ / min.
2. Proportion of it is small, ladle brick adding no steel splash, operating environment is good, pollution-free, safe, no adverse effects on the quality of molten steel.
3. Round particles, swimming is good, after the release was loose state, good spread, can quickly cover the full range of molten steel, adding no dust flying, do not pollute the environment.
4. No crust phenomenon after pouring.

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Advantages and application of ladle covering agent
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Performance and Production Process of non burned magnesia chrome brick

Magnesia chrome brick is made of some preliminary synthesis high purity raw materials. The high purity raw refractories should be high pressure formed

Do not burn magnesia chrome brick  to magnesia and chrome ore as raw materials, adding a binder to burn the refractory products, also known as chemical combination of magnesia chrome brick.


Do not burn magnesia chrome brick performance:

Does not burn the performance of magnesia chrome refractory brick china, in addition to particles and fine powder refractory raw materials, but also with the performance of the binder, the number is closely related. Compared with the same material of the refractory materials firing brick, high temperature volumetric stability slightly less sintering. Before and after the structure of the product and some of the nature of the chemical reaction and fluctuations. High temperature strength has been reduced, but the thermal shock resistance is higher.


Do not burn magnesia chrome brick production process:

Do not burn magnesia chrome fire bricks manufacturers is a different size of the magnesia and chrome ore in proportion, by adding the right amount of chemical binder, the mixing, molding, drying, low temperature and prepared. Commonly used binders are water glass, sulfate, chloride, phosphoric acid or polyphosphate and other organic binders.

Do not burn magnesia carbon bricks with iron and not including two kinds of iron, iron package in the product outsourcing a layer of iron, according to the product size made of iron, the mud into the iron box, stamped The Tie and cover are with teeth, through molding, iron into the mud material, in order to improve the iron and the product of the binding force. Iron can also be with iron ditch, clip or insert and other accessories. Production of iron shell thickness of 0.5mm, 1.0mm, 1.6mm, 2.3 mm, 3.2mm5 kinds.


Do not burn magnesia chrome brick application:

Do not burn MgO Cr brick for steelmaking furnace side wall, cement rotary kiln firing zone and other industrial furnaces. In the use of the process, the metal and magnesium sand reaction and sintering, strengthening the kiln body integrity, improve the structural strength. There is also a direct package of iron does not burn magnesite chrome bricks welded into a whole, easy to hang, the use can reduce the crack. Do not burn magnesium chrome brick production is simple, energy saving, low cost.

In addition, it should be noted that, because not burning magnesia chrome brick without high temperature firing, brick in the magnesia will occur hydration, so this refractory brick can not be long-term storage.

Yingkou Ruizhi Refractories Co., Ltd. is a professional China manufacturer of refractory material for high temperature melting furnaces.Ruizhi Refractories supply main products are: Refractory material, refractory brick, refractory castable,refractory nozzle, ceramic fiber, fire brick, insulation material, for converter, electric arc furnace, ladle, LF furnace, tundish, foundry ladle, torpedo ladle, etc. Ruizhi has established technical cooperation relationship with some refractory research institutions and universities. Ruizhi Refractories products have been exported to such as South Africa, Australia, Canada, Malaysia, Bangladesh, Iran, Saudi Arabia, UAE, Iraq, Pakistan, Philippines, Vietnam, Singapore, Tajikistan, Indonesia, South Korea, Sri Lanka, Nigeria, Kenya, Ethiopia, etc.

How to prevent ladle refractory material sticky slag

Our Ladle Refractories has Ladle magnesia carbon brick,Alumina-magnesite Carbon Brick for Ladle, Ladle Unshaped Refractory Material, Ladle Permanent Layer Castable.

With the following proper methods, we could prevents the ladle refractory material sticky slag from steel making.
It will guarantee the better quality of steel.
1. Increasing the hot turnover of ladle and decreasing the quantity and time of turnover of ladle.
2. Do better cleaning work of ladle bricks ladle, clean the ladle timely and fully, especially for the ladle month part.
3. Repair the damaged parts of the ladle lining timely, to prevent the molten steel and slag from entering into the lining.
4. Pour the slag out timely after work, shorten the time from pouring to turning over of the ladle.
5. Improve the performance of the pouring molten steel from the converter, prevent the converter slag into the ladle. And added the lime when do refining, to make sure the steel is fully melted.
6. Control the quantity of ladle, shorten the time of ladle keep for waiting, and do preheating before put the ladle into work.
7. On ladle refractories material, better the masonry quality, use the suitale size of fire bricks and improve the capacity of thermal shock resistance.
8. With suitable ladel covering agent, the use of it will keep the ladle insulated and with less ladle slag.
9. Choose the same grade of mortar to refractory bricks, such as with clay mortar for clay firebrick and magnesia mortar for magnesia firebricks.

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How to prevent ladle refractory material sticky slag

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