Considering the effect of pulp chemistry during flotation on froth stability

Within the flotation process the pulp phase chemistry has a strong effect on the froth phase and therefore the manipulation of pulp chemistry factors such as the pulp potential (Eh), pH, dissolved oxygen (DO) and ionic strength (IS) can improve flotation performance. Stability column and batch flotation tests were performed in the presence and absence of depressant at high dosages; 500 g/t Carboxymethyl Cellulose (CMC) to investigate the effects of these pulp factors on froth stability and entrainment of the froth phase through PGM flotation of a South African PGM bearing ore. The base metal containing minerals chalcopyrite and pentlandite were also targeted for recovery. Increased IS, pH and Eh, and decreased DO resulted in improved froth stability and changes in the bubble size in the froth, with the exception of changes in DO resulting in no perceived effect on bubble size. Entrainment was found to only be significantly affected by an increase in Eh.