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Kyanite
1. Thermal expansion: volume expansion at high temperature. When the temperature is lowered, the volume change is small, that is, the volume expansion characteristics caused by irreversible transformation; stability: refractory stability of kyanite production is better than clay refractory 1.5 times higher; high refractoriness: general clay refractory refractoriness is 1670-1770 ° C, while kyanite refractory material is usually greater than 1790 ° C, the highest is greater than 1 kyanite 850 ° C; also has good chemical corrosion resistance .
2, use: due to the characteristics of kyanite minerals, it is used to manufacture excellent advanced refractory materials, refractory mortar, cement and foundry resistant products, as well as plastic beaten mixes, technical ceramics, spark plugs for automotive engines, insulators, ball mill spheres , test vessels, shock-resistant items, etc., and can be refining silicon-aluminum alloy by electrothermal method, used in aircraft, automobiles, trains, ships parts. In recent years, with the development of the iron and steel industry, such mines are used to manufacture hot blast stoves, hot air towers, reheat furnaces, soaking furnaces, etc. in the form of refractory bricks, profiles, etc. Sipping and operating equipment. They can be used to produce sprayed membranes, to make the front edge of crystalline fluorspar and supersonic aircraft, metal attachments for spacecraft, and some as gemstones. It can also be used as an abrasive, as a glaze component and as a non-slip flooring material.
Therefore, the world is paying more and more attention to the development and utilization of kyanite minerals, especially in several developed countries. For example, in Japan, kyanite is an important raw material for refractory concrete, plastic and high alumina cement; the United States and some countries. Various grades of mullite clinker are prepared by calcining kyanite, which is widely used in ceramics and precision casting departments; lightweight bricks made by the Soviet Union with kyanite-silica concentrate. The trial of the amorphous refractory material prepared by using kyanite as the expansion agent on the heating furnace is successful, and the surface crack is small, the running fire phenomenon is small in use, and the use effect is good. In short, kyanite is a good expansion agent for amorphous refractories.
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