Abstract
Tests on agglomeration/flotation of coal rank 32.1 for different size fractions (−0.15, −0.25, −0.385 and −0.5 mm) were made using kerosene as the collector. The overall flotation results were correlated with the contact angle, the detachment force and the work of adhesion of water to the coal surface in the system coal/n-undecane film-air bubble — water. It was found that the mass of concentrate and the amount of coal in the concentrate increased as the dosage of kerosene increased. This increase depended on the size fraction of the flotation feed. These flotation indices were improved by increasing the contact angle and the detachment force of an air bubble from the coal surface, by increasing the thickness of the apolar liquid film on the coal surface. This increase of the film thickness also caused a decrease in the work of adhesion to the coal/film surface. The efficiency of coal beneficiation in agglomeration/flotation processes was strongly influenced by contact angle, detachment force and work of adhesion of water to the coal surface.
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