The flotation of very fine ores is desirable because of the occurrence of some ores that require fine grinding to achieve liberation. The literature has been concerned with electrical and chemical effects at the interface of finely ground minerals. The writer proposed to investigate the effect of increasing gravity by the use of centrifugal force on the collection and separation of finely ground ores.

The collection of minerals appeared to be hindered by increased gravity, but the separation was enhanced by increased gravity in the tests where conditions were conducive to froth flotation.