Magnesia chrome brick is mainly used in metallurgy industry, such as building open hearth furnace roof, electric furnace roof, furnace refining furnace and a variety of non-ferrous metal smelting furnace. Generally speaking, the high-temperature part of the wall of the ultra-high power electric furnace adopts fused cast magnesia chrome brick, the high-erosion area of the refining furnace outside the furnace adopts the magnesia chrome brick made of synthetic materials, and the high-erosion area of the non-ferrous metal melting furnace adopts the fused cast magnesia chrome brick and the magnesia chrome brick made of synthetic materials. In addition, magnesia chrome refractory bricks is also used in cement rotary kiln firing belt and glass kiln regenerator and other parts.
Magnesia chrome refractory bricks with MgO and Cr2O3 as the main components, magnesite and spinel as the main mineral components of refractory products. This kind of brick has high refractory, high temperature strength, strong resistance to alkali slag erosion, good thermal stability, and a certain degree of adaptability to acid slag. The main raw materials of magnesia chrome brick are sintered magnesia and chromite. The purity of magnesia raw material should be as high as possible. The requirements of chromite chemical composition are: Cr2O3:30 ~ 45%, CaO: ≤1.0 ~ 1.5%. The firing process of magnesia chrome brick is similar to that of magnesia brick. In order to eliminate the loose effect caused by the expansion of MgO and Cr2O3, Al2O3 or iron oxide to generate spinel during the firing process of the brick, magnesia chrome brick can also be made by the synthetic common sintered material.
In addition, there are magnesia chrome free bricks, for example, magnesia chrome free bricks with inorganic magnesium salt solution. The production process of magnesia chrome brick is simple, the cost is low, the thermal stability is good, but the high temperature strength is far less than that of burnt brick. In the late 1950s, a so-called “direct-bonded” magnesium-chrome brick was developed. This kind of brick characteristic is raw material is pure, firing temperature is high, the high temperature phase such as magnesite, spinel is combined directly between, the low molten phase such as silicate is island shape distribution, accordingly, improved the high temperature strength and slag resistance of refractory brick remarkably.
Finally, magnesia chrome refractory bricks is mainly used in metallurgy industry, such as building open furnace top, electric furnace top, furnace outside refining furnace and a variety of non-ferrous metal smelting furnace, in addition to magnesia chrome brick is also used in cement rotary kiln firing zone and glass kiln regenerator and other parts. Its quality is divided into ordinary magnesia chrome brick, directly combined magnesia chrome brick, half recombined magnesia chrome brick, recombined magnesia chrome brick and so on.
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