Sillimanite brick is a kind of refractory which is made by silimanite and other minerals. It mainly consists of Al2O3 and SiO2. Its physical and chemical properties are better than high alumina brick. Its refractoriness is high from refractoriness 1770 to 1830 ℃. Sillimanite is one of three Alumino-Silicate Polymorphs, the other two being Andalusite and Kyanite. A common variety of Sillimanite is known as Fibrolite, so named because the Mineral appears like a bunch of fibers twisted together when viewed under thin section or even by the naked eye. Sillimanite is the best raw material for the manufacture of high alumina refractories or 55-60% alumina bricks. Sillimanite brick is a kind of high grade refractory mineral, it has the characteristics of low thermal expansion rate, resistance to metallurgical slag and various glass liquid, good wear resistance of high temperature. Its physical and chemical property is better than high alumina brick, the refractoriness is 1770～1830℃, refractory under load starting point is 1500～1650℃.The sillimanite bricks are used in throat formation of glass kiln, liner of blast furnace, furnace throat and ceramic industry kiln furniture, furnace throat. And the refractory which are mainly made of natural sillimanite also have these advantages. So, siliimanite refractory material is widely used in metallurgy, chemical industry and building materials, etc.
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