Abstract
The adhesion of aggregates of galena particles to an air-solution interface was investigated experimentally by measuring the critical centrifugal force necessary to detach and sink the aggregates. Theoretical detachment-force calculations based on the Nutt (1960) and Scheludko (1968/69) theory for a single spherical particle could be correlated with the experiment results but the quantitative theoretical predictions appeared to give values one order of magnitude less than the experimental data. In addition, a series of flotation experiments were carried out with the same particle-size fractions using a small-scale flotation cell. It was found that the flotation efficiency could be directly related to the experimentally determined detachment forces for a series of particle-size fractions in the absence and presence of xanthate collector. It is suggested that the adhesion forces may play a more important role than the capture forces in determining the flotation performance of rough and angular particles. Finally the centrifuge technique could prove to be a useful method for characterizing the floatability of minerals.
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