ZHOU Zhou1, ZHOU Han-wen1,2, CUI Xiao-mei1, ZENG Wei-neng3, YANG Zeng-liang3,
MEI Ming-jun3, YIN ke1
(1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;
2. State Key Laboratory of Geological Processes and Mineral Resources (GPMR), Wuhan 430074, China;
3. Kaolinite Science and Technology Limited Company, Maoming 525026, China)
Abstract: Four different kaolin samples from Xinwumian of Hepu Area, Guangxi Province, China were studied as primary materials to determinate their particle size distribution, whiteness, chemical components, mineral association and morphological characteristics. Then the transformation heats and phase changes during thermal treatment were revealed by DSC-TG-DTG measurements. Results indicate that grain classification, impurity elements, mineral facies and kaolinite crystallinity restrict phase transformations of kaolin during heating. A series of parameters in DSC-TG-DTG curve including weight loss in TG curve, temperature and area of endothermic valley in DTG curve and temperature, area and shape index of thermal reaction in DSC curve reveal clearly the difference caused by these factors.
Keywords: kaolin; phase transformation; thermal analysis; Hepu; Guangxi Province
Email: hwzhou@cug.edu.cn
ACTA MINERALOGICA SINICA Vol. 35, No. 3, 2015, Page 384-394
