Abstract
Selectivity in the froth zone of two industrial flotation columns in a Mo-cleaning circuit has been studied and modelled. Froth depth is shown to be a significant factor. Froths deeper than 1 m gave selective recovery of Mo, with upgrading of 10–15% absolute. Froths less than 50 cm showed no selectivity. This difference between deep and shallow froths is attributed to mixing caused by the wash water input. A model based on plug flow was developed and shown to fit the grade profiles through the froth.
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