2.3.2. Flotation equipment
Samples were floated in a 3 dm3 modified stainless steel Denver cell (Guy, 1992) in which the impeller was fitted with a variable speed drive and was driven from below to allow the whole surface of the froth to be scraped with a paddle at a constant depth and rate. The cell was fitted with a rubber diaphragm, sight tube, and electronic sensor for automatic detection and control of the pulp level.