Dry Separation of Iron Minerals from Low-Grade Coal-series Kaolin
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第5期
论文作者：黄腾 雷绍民 LIU Mochou JI Mengjiao LIU Yuanyuan YIN Xudong PENG Yongjun
文章页码：935 - 940
摘 要：Dry separation of iron mineral from low-grade coal-series kaolin in Hubei Province of China was investigated. The structure and chemical composition of the kaolin ore were determined by X-ray diffraction（XRD） and X-ray Fluorescence（XRF） analyses. The narrow particle size range classification, dry magnetic separation and calcination were carried out to evaluate the particle size distribution, and the relation between the content of iron and the whiteness. Experimental results revealed that the highest content of iron（3.70%） in kaolin ore was in the particle size range from 60 to 74 μm, and pyrite was the main occurrence of iron in the kaolin ore. Dry magnetic separation showed that the removal rate of iron in kaolin ore could be increased obviously after calcination, and the rate of iron removal was 60% in the particle size range from 60 to 74 μm. As pyrite can be transformed into hematite through calcination, thermodynamic studies and XRD analysis showed that the maximum content of hematite was obtained at 900 ℃, which would be more beneficial to magnetic separation.
黄腾1，雷绍民1，LIU Mochou1，JI Mengjiao1，LIU Yuanyuan1，YIN Xudong2，PENG Yongjun1,3
1. School of Resources and Environmental, Wuhan University of Technology2. Yichang Huilong Science and Technology Co., Ltd.3. The University of Queensland
摘 要：Dry separation of iron mineral from low-grade coal-series kaolin in Hubei Province of China was investigated. The structure and chemical composition of the kaolin ore were determined by X-ray diffraction（XRD） and X-ray Fluorescence（XRF） analyses. The narrow particle size range classification, dry magnetic separation and calcination were carried out to evaluate the particle size distribution, and the relation between the content of iron and the whiteness. Experimental results revealed that the highest content of iron（3.70%） in kaolin ore was in the particle size range from 60 to 74 μm, and pyrite was the main occurrence of iron in the kaolin ore. Dry magnetic separation showed that the removal rate of iron in kaolin ore could be increased obviously after calcination, and the rate of iron removal was 60% in the particle size range from 60 to 74 μm. As pyrite can be transformed into hematite through calcination, thermodynamic studies and XRD analysis showed that the maximum content of hematite was obtained at 900 ℃, which would be more beneficial to magnetic separation.
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