Abstract
Tests on the aggregative flotation of coal of rank 33 have been carried out with different particle sizes and collector concentrations. The results are correlated with the contact angle, the detachment force of an air bubble from the coal surface, the work of adhesion of water to coal surface precovered with n-alkanes, and the ratio of the detachment force to the work of adhesion. Increasing collector concentration increases coal recovery and concentrate mass. Changes in ash reduction are not proportional to collector concentration. The increase in flotation efficiency with increasing non-polar collector concentration results from increasing contact area between coal particles and air bubbles and decreasing work of adhesion of water to the coal surface.
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