The main crystal phases in high alumina products are mullite and corundum, and the content of corundum increases with the increase of alumina content. Corundum products containing over 95% alumina are a high-quality refractory material with a wide range of uses. Chromium bricks are mainly made from chromite as raw material, and the main crystalline phase is chromite. It has good corrosion resistance to steel slag, but poor thermal shock resistance and lower deformation temperature under high temperature and load. Chromium magnesium bricks made from chromium ore and magnesium sand in different proportions have good thermal shock resistance and are mainly used as alkaline top bricks for open hearth furnaces.
Carbon based products are another type of neutral refractory material, which can be divided into three categories based on the composition of carbon containing raw materials and the mineral composition of the products: carbon bricks, graphite products, and silicon carbide products. Carbon bricks are made from high-grade petroleum coke as raw material, with tar and asphalt as binders, and fired under air isolation conditions at 1300 ℃. Graphite products (excluding natural graphite) are made from carbon materials by graphitization treatment at 2500-2800 ℃ in an electric furnace. Silicon carbide products are made from silicon carbide as raw material and fired at 1350-1400 ℃ with binders such as clay and silicon oxide. Silicon nitride silicon carbide products can also be made by adding silicon carbide and silicon powder in a nitrogen atmosphere in an electric furnace.
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