Abstract
The effect of solids and chemical addition on column flotation of coal was investigated by examining the changes in the flow characterization and flotation performance. It was found that larger feed particles reduce the stability and the thickness of froth zone. While the addition of collectors (kerosene) increases the coal particle surface hydrophobicity, thus accelerating the froth collapse, bubble coalescence, and reducing the gas holdup; adding a frother increases the ratio of recovery of coarse particles (+200 μm) to that of fines. Using Dowfroth 250 as frother resulted in higher recovery and flotation rate constants, as well as the recovery of larger particles than in the case of MIBC. A method for predicting the bubble loading in flotation columns is proposed.
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