Refractory bricks for electric furnace wall are a kind of refractory material specially used for electric furnace wall, which has the characteristics of high temperature resistance, thermal shock resistance, wear resistance and so on. There are many types of refractory bricks for electric furnace walls, mainly including the following:
High-alumina bricks: High-alumina bricks are refractory bricks made of alumina as the main raw material, adding an appropriate amount of additives, and sintering at high temperature. High alumina brick has excellent high temperature resistance, and its refractory degree can reach 1750-1800, which is suitable for the high temperature part of the electric furnace wall. At the same time, high-alumina bricks also have good thermal shock resistance and wear resistance, and can withstand the thermal expansion and contraction of the furnace wall at high temperatures, as well as the wear of materials on the furnace wall.
Clay bricks: Clay bricks are refractory bricks made of kaolin as the main raw material, adding an appropriate amount of additives, and going through molding, drying, sintering and other processes. The refractory of clay bricks is low, generally between 1350-1450, but its ** is low, and it is suitable for the wall of the electric furnace with a lower temperature. Clay bricks have poor thermal shock resistance and wear resistance, but they have good thermal insulation properties and can reduce the energy consumption of electric furnaces.
Magnesia-chrome brick: magnesia-chrome brick is a refractory brick made of magnesia and chromite as the main raw materials, adding an appropriate amount of additives, and sintering at high temperature. Magnesia chrome brick has extremely high refractoriness, its refractory degree can reach 2000-2200, suitable for the high temperature part of the electric furnace wall. At the same time, magnesia-chrome bricks also have good thermal shock resistance and wear resistance, and can withstand the thermal expansion and contraction of the furnace wall at high temperature, as well as the wear of materials on the furnace wall. However, magnesia-chrome bricks have a high ** and are easy to react with alkaline substances at high temperatures, so care should be taken when using them.
Carbon brick: Carbon brick is a refractory brick made of graphite as the main raw material, adding an appropriate amount of additives, and going through molding, drying, sintering and other processes. Carbon brick has excellent high temperature resistance, and its refractory degree can reach 2500-3000, which is suitable for the high temperature part of the electric furnace wall. At the same time, carbon bricks also have good thermal shock resistance and wear resistance, and can withstand the thermal expansion and contraction of the furnace wall at high temperatures, as well as the wear of materials on the furnace wall. However, carbon bricks are high in ** and are prone to oxidation at high temperatures, so care should be taken when using them.
Zircon bricks: Zircon bricks are refractory bricks made of zircon as the main raw material, adding an appropriate amount of additives, and after molding, drying, sintering and other processes. Zircon bricks have extremely high refractoriness, and their refractory degree can reach 2700-3000, which is suitable for the high temperature parts of the electric furnace wall. At the same time, zircon stone bricks also have good thermal shock resistance and wear resistance, and can withstand the thermal expansion and contraction of the furnace wall at high temperatures, as well as the wear of materials on the furnace wall. However, zircon bricks are higher and easily react with certain oxides at high temperatures, so care should be taken when using them.
In short, there are many types of refractory bricks for electric furnace walls, and different refractory bricks have different properties and application ranges. When choosing refractory bricks for electric furnace walls, the most suitable refractory bricks should be selected according to the working conditions, temperature requirements, cost and other factors of the electric furnace. At the same time, the wear and tear of the furnace wall should also be checked regularly, and the damaged refractory bricks should be replaced in time to ensure the normal operation and service life of the electric furnace.
The lining of the electric furnace is composed of a lining, a thermal insulation layer and a working lining, and the lining is made of refractory bricks, ramming materials, gunning materials, etc., so what are the refractory bricks used for the wall of the electric furnace?You can find the answer you want by reading this article.
What are the refractory bricks used for the wall of the electric furnace?
According to the location of the furnace wall of the electric furnace: 1. The main furnace wall adopts direct combination of magnesia-chrome bricks, pre-reaction magnesia-chrome bricks, and magnesia bricks2. The slag line is made of oil-impregnated magnesia bricks, directly combined magnesia-chrome bricks, fused cast magnesia-chrome bricks, and magnesia-carbon bricks3. The hot spot is made of refractory bricks and the slag line is the same.
Directly bonded magnesia-chrome brick is a refractory material made by special processes such as magnesia and chromium concentrate and increasing the firing temperature. This product has good high temperature resistance, erosion resistance and thermal shock resistance, and is a refractory brick used for the main furnace wall of the electric furnace, and can also be used for slag line and hot spots
Cast magnesia-chrome bricks, add a certain amount of admixtures with magnesia and chrome ore, mix, press blanks and plain firing, crush into blocks, melt into electric arc furnaces, and then inject into the mold for annealing to produce mother bricksThe mother brick can be cut and ground to make the required fused brick model. This product has good resistance to melt erosion, penetration and erosion, and can be used in the electric slag line
Magnesia carbon brick is made of high melting point alkaline oxide magnesium oxide (melting point 2800) and high melting point carbon material that is difficult to be infiltrated by slag as raw materials, and various non-oxide additives are added. A non-charcoal composite refractory made by combining carbonaceous binders. It can be used for the lining of converters, AC arc furnaces, DC electric arc furnaces, and the slag line of ladles.
What are the technical measures to improve the life of refractory bricks on the furnace wall of electric furnace?
1. Large crystalline magnesia: high purity, low SiO2, B2O3, high Cao SiO2, grain greater than 150 m;
2. High-purity graphite: type, particle size distribution, purity;
3. Additives: Al, Si, MG, alloy, boride (ZRB2, CAB2, MG2B3), B4C;
4. Vacuum oil immersion: it can close the pores and improve the erosion resistance
5. Binder: phenolic resin (higher carbon residue 50 60), asphalt, asphalt resin composite;