To analyze the performance characteristics of bauxite-based mullite from typical production areas in China,eight kinds of bauxite-based mullite raw materials were obtained from Shanxi,Henan and Hunan,among which Shanxi A,Henan A,Shanxi B and Shanxi C were fired in tunnel kilns,Henan B,Shanxi D and Hunan A were fired in rotary kilns,and Hunan B was fired in electric arc furnaces.The apparent porosity,bulk density,water absorption,microstructure and phase composition of the raw materials were studied.The results show that:(1)the water absorption of mullite calcined in tunnel kilns is 2.5％-3.5％,and the mullite grains are fully developed as columnar,with large length-diameter ratios;(2)the water absorption of mullite calcined in rotary kilns is ≤2.0％,and the grain size of mullite is small;(3)fused mullite is the densest,with the water absorption＜1.0％as well as completely developed sturdy crystals;(4)the main phase of all the bauxite-based mullite raw materials is mullite,and some of them contain a small amount of corundum and rutile;among them,fused mullite has a low glass phase content,and sintered mullite con-tains 8 mass％-14 mass％glass phases.
synthetic mullitephase compositionmicrostructurephysical properties and chemical composi-tion
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维普
