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.

Article source:
The maintenance of induction furnace - continuous smelting and repair

Email: sales@ruizhirefractory.com

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.

Article source:

How to identify bentonite

Email: sales@ruizhirefractory.com

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.

Article source:
New trends of China refractory materials

Email: sales@ruizhirefractory.com

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.

Article source:
Advantages and application of ladle covering agent
Email: sales@ruizhirefractory.com

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.

Article source:
How to prevent ladle refractory material sticky slag

Email: sales@ruizhirefractory.com

Refractory definition

Refractory material

Refractory material refer to inorganic nonmetallic materials with a refractoriness of not less than 1580 ° C.
Refractory materials are generally made of natural minerals and rocks of aluminum silicate as the main refractory raw material. Its basic processes and certain basic characteristics are similar to those of other products of the silicate system. Therefore, refractories are listed as one of the silicate systems Product and important part of the silicate industry. Refractory product same to cement, ceramics, glass and other silicate industry has a very important position and role in the national economy.
Because it has a special performance of resistance to high temperature  in the thermal equipment, then it occupies a very important position in the development of modern industry. With the discovery and need of science and technology, the use of refractory materials for furnace is expanding, from metallurgy (including steel and nonferrous metallurgy, etc.), silicate (cement, ceramics, etc.), chemical, power, machinery and other industries, extended to everything High-temperature operation of the industrial and mining enterprises, the kiln (combustion kiln, molten pool, fire, crucible) and other heat parts of thermal equipment, refractories are indispensable important building structural materials. In the field of cutting-edge science (such as rockets, atomic reactors, etc.) is also an indispensable high temperature resistant materials or parts.
As the refractory material used in a variety of different heating conditions of high temperature equipment, it is subject to high temperature and other different conditions, by the complex physical and chemical reactions and damage. Therefore, the refractory material must have the following important performance.
1.Refractory material is not easy to melt when in the case of high temperature
The working temperature of modern industrial kiln furnace is generally between 1000 ~ 1800 ℃, therefore the refractory for sale material must first be not easy to melt in this temperature.
2.Refractory material does not soften when in the case of high temperature pressure
The melting temperature of Most refractory material more than 1650 ~ 1700 ℃, but it reached the melting temperature before the deformation (softening), loss of structural strength, so the refractory material supply not only have a high melting temperature, but also with high temperature Under the conditions of the load does not occur deformation performance.
3.Volume stability in high temperature environment
Refractory materials used in high temperature conditions, due to physical and chemical reactions within the material and make the volume changes. Most of this change in refractory material is volume shrinkage, and a few are inflated. Whether it is volume shrinkage or expansion, such as beyond a certain range can cause damage to the furnace. So the refractory material is required to have good high temperature volumetric stability.
4.Refractory product can resist the sudden change and uneven heating of temperature to avoid damage to the furnace
In the intermittent operation of the kiln, the high temperature, the rapid changes in the various parts of the masonry heat uneven, brick body will produce stress inside the material cracking, resulting in furnace damage. So the refractory material should be able to withstand the rapid changes in furnace temperature and fluctuations do not crack the performance of thermal stability.
5.Refractory can resist the erosion of slag when in the case of high temperature
in the use of the process, due to disguised contact with fuel ash, molten slag and molten metal and other effects were eroded. Therefore, the refractory material should have the ability to resist this erosion. In the use of refractory materials, according to the main requirements of the use of various refractory materials and have the characteristics of a reasonable choice.

Article source:

Refractory definition

Email: sales@ruizhirefractory.com