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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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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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.

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Refractory definition

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