Amorphous matter in kaolins and its geological implications |
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| Authors: | Shen Xiao-hua Shen Zhong-yue Yang Shuai-jie Fang Da-jun |
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| Institution: | (1) Dept of Earth Sciences, Zhejiang University, 310027 Hangzhou, China |
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| Abstract: | Selective dissolution with ammonium oxalate was carried out to extract amorphous matter in some kaolins from China. Ammonium
oxalate extraction is an effective method to extract amorphous constituents without destroying the kaolinite crystalline structure.
The study showed that, absolute amounts of amorphous constituents in kaolins are in the order Al>Si>Fe, but that relative
amounts are in the order Fe>Al>Si. The amorphous phases are probably mainly in the form of separate particles, or colloidal
particles absorbed on the surface of kaolinite particles. Compared to older kaolins, younger kaolins contain much more amorphous
iron content.
Project (49974016) supported by NSFC. |
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| Keywords: | amorphous matter kaolin extraction |
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