High alumina clay is often used for calcining mature material at high temperature (1400～1800℃). Refractory clay is used in the building materials industry to make high alumina bricks, phosphate high alumina refractory bricks, and high alumina cast bricks for cement kilns and glass melting kilns. High-alumina clay is calcined and then mixed with limestone to make aluminum-containing cement.
Refractory clay refers to clay that has a refractoriness greater than 1580°C and can be used as a refractory material and bauxite used as a refractory material. In addition to their high refractoriness, they can maintain volume stability under high temperature conditions, and have slag resistance, resistance to rapid cold and rapid heat, and certain mechanical strength, so they are extremely firm after calcination.
high alumina clay Al2O3 content is relatively high, hardness and specific gravity are relatively large, high refractoriness, commonly used to make high-grade clay products.
High alumina clay is melted in an electric arc furnace to produce abrasive materials. Among them, fused corundum abrasive is currently the most widely used abrasive, accounting for 2/3 of all abrasive products. High alumina clay can be used to produce various aluminum compounds, such as aluminum sulfate, aluminum hydroxide, aluminum chloride, potassium aluminum sulfate and other chemical products. In the ceramic industry, hard clay and semi-hard clay can be used as raw materials for the manufacture of daily ceramics, architectural ceramics and industrial ceramics.
high alumina clay is also used in oil wells, as a proppant for purifying petroleum, as a fertilizer promoter in agriculture, and as an anti-skid and anti-wear paving material, etc. Hard clay is also used to make a new type of refractory insulation material-refractory fiber. It has the advantages of high temperature resistance, low thermal conductivity, acid and alkali resistance, sound absorption and light weight. It is used in metallurgy, machinery, electronics, glass, ceramics and other industries. widely.
Process properties of high alumina clay
Refractory clay can obtain certain density and strength properties after being calcined. It is an important process property for bonding clay or high alumina clay and hard clay used for firing clinker.
Generally speaking, the sinterability of a raw material depends on its mineral composition and chemical composition. A high content of Al2O3 has a good sinterability, while a high content of impurities will reduce its sinterability.
①Desiliconization of refractory clay: A single flotation method is generally used for desiliconization.
②Removal of iron and titanium impurities from high-alumina clay: the coarse-grained embedded iron impurities in the presence of pyrite are removed by flotation; the fine-particle embedded iron and titanium impurities can be removed by high-gradient magnetic separation technology; The selective chlorination and volatilization method of iron and titanium impurities in the form of fine particles, ultra-microscopic inclusions and isomorphic forms is a more effective way.
③Removal of potassium and sodium from high-alumina clay. Impurities: potassium and sodium mainly exist in the ore in the form of hydromica and muscovite, which can be removed by flotation.
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