Utilization of coal slime: Coal and kaolinite separation by classification, forward and reverse flotation method
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State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines
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Anhui University of Technology
CORRESPONDING AUTHOR
Liang Shen   

State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines
Publication date: 2022-03-29
 
Physicochem. Probl. Miner. Process. 2022;58(3):147742
 
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ABSTRACT
Coal slime is not only a solid waste, but also a source of energy. With the improvement of environmental protection requirements, the comprehensive utilization of slime has become an urgent problem for coal preparation plants. In this paper, we put forward a promising way of coal slime resource utilization. X-ray diffraction (XRD), X-ray fluorescence spectrometer (XRF) and laser particle sizer was used to analyze the properties of coal slime. Obtained results showed that the slime was mainly composed of the coal, kaolinite and quartz with a particle size of -100 μm. Most kaolinite minerals can be enriched in overflow when the feed pressure is 0.2 MPa by using hydrocyclone. 21.3% clean coal with ash content of 12.3% and 33.46% kaolinite with particle size of -5 μm can be recovered by forward flotation and reverse flotation respectively. Coal water slurry with 61% concentration can be prepared from reject of forward flotation and concentrate of reverse flotation at shear rate of 100 s-1. This study has an important practical application value in clean and efficient utilization of coal.
eISSN:2084-4735
ISSN:1643-1049