Abstract
ABSTRACTOxidized coal is difficult to float with common oily collectors because oxidation processes occurring on the coal surface reduces the surface hydrophobicity of coal. Grinding pretreatment has been widely applied in the improvement in the floatability of oxidized coal. However, there is no sufficient investigation into the optimization of grinding conditions for the effective flotation of oxidized coal. This paper is to reveal the effects of grinding conditions, such as grinding time, pulp density, and feed amount on the flotation behavior of oxidized coal. The optimum grinding conditions are as follows: the feed amount is 70 g, the pulp density is 40%, and the grinding time is 15 min. Under the optimum grinding conditions, 62.53% combustible matter recovery with 12.99% clean coal ash content is obtained.
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