Effect of Calcination Temperature on Phase and Structure of Low-Grade Clay

Abstract

Abstract: The changes of phase and structure of low-grade clay at different calcination temperatures (650, 700, 750, 800, 850 ℃) were studied by DSC-TG, XRD, IR, Raman and NMR. The results show that the low-grade clay is mainly composed of quartz with high crystallinity, and contains a small amount of phengite, kaolinite, illite, calcite, pyrite and microcline with low crystallinity. After calcination at 650~850 ℃, kaolinite and illite decompose into amorphization SiO₂ and Al₂O₃, and some quartz transform into amorphous SiO₂. The adsorbed water and the structure water in the low-grade clay decompose, the aluminoxy octahedron gradually transforms into aluminoxy tetrahedron, and the short-range order structure of Si—O—Si in quartz is also destroyed to a certain extent.

Key words: low-grade clay, calcination temperature, phase composition, structural change, amorphization

CLC Number:

TD985

SUN Yue, LIU Xiaoqing, HE Feng, DENG Yuhua, LI Runguo, ZHANG Chao, ZHENG Xianming, XIE Junlin. Effect of Calcination Temperature on Phase and Structure of Low-Grade Clay[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1309-1314.

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