Silicon mullite brick for cement kiln and preparation method thereof

The invention discloses a silicon mullite brick for a cement kiln and a preparation method thereof. The silicon mullite brick comprises the following materials by weight percent: 70-85 percent of superfine bauxite, 0.5-15 percent of silicon carbide, 0.5-15 percent of industrial waste and 3-8 percent of bonding clay; in addition, based on the total weight of the four materials, 0.2-0.7 percent of industrial dextrin and 2-5 percent of water are added. According to the method, firstly the raw materials are mixed, then aged and formed, and subsequently dried and sintered to obtain the product. In the silicon mullite brick, the industrial waste containing silicon carbide and metal silicon is introduced to replace a part or the whole part of carbon carbide of the materials; with the silicon mullite brick and the preparation method thereof, the problem of high cost caused by the rising of the prices of carbon carbide materials as well as the problem of pollution generated by the industrial waste are solved; the physical and chemical indexes of the silicon mullite brick prepared according to the method meet the application requirements, and the production cost problem of a refractory material enterprise is solved, so that the silicon mullite brick and the preparation method thereof have remarkable economic benefit and social benefit.