Experimental study on intensified flotation of low-rank coal pro-duced in Inner Mongolia region using highly effective collector
In order to promote high-efficiency utilization of the low-rank coal resource in Inner Mongolia Autonomous region,based on proximate,ultimate,size and densimetric analysis,a study is conducted on sur-face properties of the coal by X-ray diffraction and Fourier transform infrared spectroscopy examination,as well as on the effectiveness and mechanism of the high-efficiency collector through comparative flotation,contact angle and adsorption testing.As evidenced by study results,the minerals in the coal are predominately kaolinite,and on surface of the coal are different hydrophilic oxygen-containing functional groups,such as—OH,C=O,C—O,etc.,plus a large amounts of fissures and pores—all unfavorable factors causing the poor flotability of the coal;with the use of the BK610 collector at a dosage of 1 kg/t,the yield and ash of flotation concentrate are 65.35％and 13.58％,respectively,a result much better than the case using the conventional collector diesel(at a dosage of 3 kg/t,the yield and ash of concentrate are 60.82％and 13.37％,respectively);compared with the use of diesel,the use of BK610 can lead to an improved flotation efficiency with drastically reduced consumption by 66％;when BK610 and diesel are used at a respective dosage of 1 kg/t and 3 kg/t,the use of the former can give rise to larger contact angle of coal and agent adsorption rate,which are 9° and 4.75 percentage points higher than the case of using the latter,well demonstrating the efficiency of BK610 in improvement of flotation perform-ance.The study made in the paper contributes to the development of collectors for high-efficiency flotation of low-rank coal and enhancement of the rate of utilization of such coal products in Inner Mongolia district.
flotation of low-rank coalhigh-efficiency collectorsurface propertyflotation testcontact angledosage of collectoradsorption rate
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