Preparation Of Cordierite Material With Rare-Earth Tail

Industrial waste is one of the most important factors for environment pollution and resource waste. Properly use industrial waste not only can induce cyclic utilization of resource but also relief the pollution of industrial waste. It was necessary to confirm the chemical composition for synthesizing a new kind of material with other raw material.Cordierite was widely used in kiln、aviation、electromagnetic, infrared material、 biological material industrial, etc, for its low thermal expansion coefficient and high thermal shock resistant. But content of cordierite in nature was rare, so it may have special significance and widely prospect for compounding cordierite with industrial waste.In this paper, cordierite was synthesized with industrial waste, light-burned magnesia, alumina bauxite as materials. Influence factors such as chemical composition, raw material, sintering temperature, soaking time, additives for thermal expansion coefficients of cordierite synthesized were approached. Synthesized cordierite samples were characterized mainly with thermal expansion coefficient. Additives used in experiment were cordierite, raw spodumene and calcined spodumene.Experiment results showed that suitable firing temperature was 1320℃, suitable socking time was 30 min, cordierite samples were synthesized with low thermal expansion coefficient(a< 3.0×10-6/℃) with rare-earth tail, industrial magnesia, light-burned magnesia, Henan bauxite, etc as materials, The amount of rare-earth tail used could reach to 50%. Calcined spodumene as additive could reduce thermal expansion coefficient of the cordierite samples, its optimum use level was 4wt%.