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Effects of Ca2+ and SO4 2- ions on fluorite flotation

Xun Luobing, Hu Jiacheng, Shi Qing, Zhang Guofan

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 2

95--104

The effects of Ca2+ and SO4 2- on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of SO4 2- and Ca2+ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of SO4 2- on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more SO4 2- are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.