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ABSTRACT
Fine-mineral separation has been a difficult problem in the mineral-processing field. A new cyclonic-flotation system was designed to solve the fine-mineral-recovery problem. Its design and operation are different from those of other cyclonic-flotation columns. In this study for the new cyclonic column, optimal reagent dosages, solid concentration, and aeration rate were determined. Many factors influence the operation of column flotation; however, in this study, mainly the effect of the circulation rate on the flotation behavior of the wide and narrow particle-size ranges of coal was investigated. The chosen circulation rates were 0.895, 1.044, 1.210, 1.369, 1.461, 1.578, 1.653, and 1.752 m/s. The wide particle size refers to a value of less than 0.5 mm. The narrow particle-size ranges refer to values from −250 to +75 μm, −75 to +45 μm, −45 μm, and +250 μm. The results showed that the combustible recovery of the narrow-size particles increased first and then decreased with the increasing circulation rate. The combustible recovery order of the narrow-size ranges in the same flotation time was as follows: −250 to +75 μm > −75 to +45 μm > −45 μm > +250 μm.
Funding
The Authors would like to thank the support from “National Key Basic Research Program of China” (Grant No. 2012CB214905), “Key project of science and technology research of Education Department of Henan Province” (Grant No. 16A440002), and “The doctoral foundation of Henan Polytechnic University” (Grant No. B2015-13).