Effect of two-stage stirred pulp-mixing on coal flotation
Xiahui Gui 1  
,   Yongtian Wang 2,   Haijun Zhang 2,   Shulei Li 1
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China University of Mining & Technology
Chinese National Engineering Research Center of Coal Preparation and Purification
Xiahui Gui   

School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
Publication date: 2014-01-01
Physicochem. Probl. Miner. Process. 2014;50(1):299–310
Stirred pulp-mixing is performed before coal flotation. In this study, a two-stage stirred pulp-mixing tank was designed based on the single-stirred process to intensify the mixing effect of pulp and flotation reagents. A tank has a pitched-impeller opening-type turbine. Stirred pulp-mixing and flotation experiments were conducted on a sample of anthracite fine coal (-0.5mm) from the Xuehu Coal Preparation Plant in Henan Province, China. The results of the two-stage stirred pulp-mixing were compared with those of a single-stage stirred pulp-mixing in terms of flotation performance. Compared with the single-stage stirred pulp-mixing, two mixing areas and double-layer impeller were able to strengthen the energy input to the stirred system, thereby improving the mixing efficiency of flotation reagents and coal particles in the pulp. The two-stage stirred pulp-mixing significantly increased the flotation feed rate of the cyclone-static micro-bubble flotation column and concentrate yield, enhanced the combustible matter recovery effect of coarse particles at a suitable flotation feed rate, and ensured the recovery effect of fine particles at high flotation feed rate.