(1. School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;2. State Key Lab of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China)
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Published
2011-03-31
Issue Date
2011-03-31
Abstract
This research investigated the preparation of mullite with an Al2O3∶SiO2 ratio of 3∶2 from Suzhou lowgrade kaolin by direct calcination and the calcination with the addition of Al(OH)3. The phase transformations of samples calcined between 1 000 ℃ and 1 500 ℃ for an hour were investigated using XRF, DTA, XRD and IR measurements. The results showed that a 3∶2 type mullite without the presence of cristobalite was formed in kaolin calcined at 1 500 ℃. The formation temperature of mullite was lowered down to 1 300 ℃ after adding Al(OH)3, however, the crystalline degree of mullite formed was lower. Although the increase in calcination temperature can increase the crystalline degree of mullite, the alumina content of mullite decreased due to the formation of corundum.
ZHOU Huamei, QIAO Xiuchen, YU Jianguo.
Preparation of Mullite from Lowgrade Kaolin. Journal of Wuhan University of Technology. 2011, 33(3): 121-125
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References
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