| The selection of tiny coal has played more and more important roal in the coal industry. It is becoming one of the important point in clean coal technology, and a valid way to make use of coal resources and protect environment comprehensively. As a main technique to separate coals mine, floatation need to be further perfect in its theories and practice.The paper study on the higher ash content in clean coal from flotation process than gravity concentration. Lab and industrial Experimenting is based on the flotation technology of Wangfenggang coal preparation plant Doing some flotation experiments including raw coal property, pulp consistency regime of agent, flotation circuit , inhibitor addition and so on, to study the factors affecting the ash content of Clean Coal. Putting forward a feasible technological measures to improve the coal flotation efficiency. The scheme is adopt cleaning circuit and adding arboxymethylcellulose (CMC) as depressant in the refine process to reduce the ash content of Clean Coal.The result shows that the ash content can be reduced by 2-5%, and it has a important realistic meaning for Wangfenggang coal preparation plantMake use of modern test technique including X-ray diffraction, FTER(Fourier transform Infrared Spectroscopy) and contact angle measurement, to analyze the depressant mechanism of CMC.The result show that :the contact angle of gangue in CMC is much smaller than in water while the contact angle of coal is almost the same in two liquor; the main mineral composition in coal and gangue is kaolinite, quartz, pyrite, illite and so on; the -C-H of CMC can selectively absorb to gangue while the -OH and C-O-C contact water, to enlarge the hydrophilic characteristics between coal and gangue and enlarge the surface properties difference between coal and gangue, in order to inhibit gangue.The research on flotation technology and depressant mechanism support a dependable foundation for coal flotation both in theory and practice.
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