Optimization of Coal Washery Tailings by Flotation Process

Changliang Shi, Gan Cheng and Shengnan Wang
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Changliang Shi: College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Gan Cheng: College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Shengnan Wang: College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Energies, 2019, vol. 12, issue 20, 1-12

Abstract: Flotation tailings are by-products of coal preparation plants, which do not only occupy cultivated land but also cause pollution. The high ash content and low calorific value of tailings limit their applications. Deashing is the precondition for the reutilization of flotation tailings. However, it is more difficult to remove ash content from flotation tailings compared with raw coal. Based on the analysis of coal properties, the flotation performance of different collectors was compared in this study. Flotation flows and the mechanism of depressants were explored. The optimized flotation conditions were as follows: pulp concentration of 100 g/L, inflation rate of 0.25 m 3 /(m 2 ·min), collector (C4) dosage of 300 g/t, frother dosage of 500 g/t, and revolving speed of 2200 rpm. The ash content of clean coal was also reduced by adding a depressant. The flotation performance was best when the amount of sodium hexametaphosphate (used as the depressant) was 4 kg/t; the recovery of clean coal was 71.88%, and the ash content was 10.64%.

Keywords: coal washery tailings; flotation; ash reduction; collector (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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