I. Characteristics
1. Excellent high temperature resistance: magnesia-chrome bricks are mainly composed of magnesium oxide (MgO) and chromium oxide (Cr₂O₃), which have high melting points and stability at high temperatures. Generally, its refractoriness can reach 1700℃ - 1800℃, and it can work stably for a long time in high temperature industrial environments such as steel and non-ferrous metal smelting, and effectively resist the erosion of high temperature melts and furnace gases.
2. Good slag resistance: The combination of magnesium oxide and chromium oxide gives magnesia-chrome bricks excellent slag resistance. In the metallurgical process, the slag composition is complex and has strong corrosiveness. Magnesia-chrome bricks can resist the chemical erosion of acidic and alkaline substances and various oxides in the slag, reduce the loss of bricks, maintain the integrity of the furnace lining, and thus extend the service life of the kiln.
3. High mechanical strength: After high temperature firing and special process molding, magnesia-chrome bricks have high compressive and flexural strength. This makes it less likely to break or fracture when subjected to the impact, friction and gravity of materials at high temperatures, providing reliable structural support for the kiln and ensuring the smooth progress of the production process.
4. Good thermal shock stability: Although not as good as some specially designed refractory materials with super strong thermal shock stability, magnesia-chrome bricks can adapt to the temperature fluctuations of the kiln to a certain extent. Its internal structure and mineral composition enable it to buffer the thermal stress generated during repeated heating and cooling cycles to a certain extent, reducing the risk of cracking due to thermal expansion and contraction.
2. Application
1. Iron and steel industry: widely used in key equipment such as steelmaking converters and electric furnaces. The temperature of the steelmaking process is extremely high, and molten steel, slag, etc. seriously erode the furnace lining. Magnesia-chrome bricks, with their high temperature resistance and slag resistance, can effectively protect the furnace body as a furnace lining material, reduce the number of maintenance times, and improve production efficiency. For example, in the trunnion area and slag line of a large converter, the use of magnesia-chrome bricks can ensure that these vulnerable parts maintain good working conditions within a furnace service cycle.
2. Nonferrous metal smelting: Magnesia-chrome bricks are also indispensable for smelting furnaces of nonferrous metals such as copper and nickel. The smelting processes of nonferrous metals are diverse, and the atmosphere and melt properties in the furnace are complex. Magnesia-chrome bricks can adapt to different chemical environments, prevent the lining from being corroded and penetrated prematurely, ensure the smooth progress of the smelting process, improve the metal recovery rate, and reduce production costs.
3. Cement rotary kiln: During the cement production process, the temperature in the rotary kiln is high and the material moves frequently, which places high demands on the kiln lining materials. Magnesia-chrome bricks are used as lining materials here. On the one hand, they must withstand the erosion of high-temperature clinker, and on the other hand, they must resist the erosion of the alkaline atmosphere in the kiln. Their excellent properties can be fully utilized to help the efficient and stable production of cement.
Magnesia-chrome bricks have become key refractory materials in many high-temperature industrial fields with their unique performance advantages, safeguarding the stable operation of industrial production.
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