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Pyrite Flotation With Xanthate Under Alkaline Conditions --Application to Environmental Desulfurisation

Summary: Pyrite Flotation With Xanthate Under Alkaline Conditions --
Application to Environmental Desulfurisation
R Mermillod-Blondin1,2
, M Kongolo1
, P de Donato1
, M Benzaazoua2,3
, O Barrès1
B Bussière2,3
and M Aubertin4
The extensive literature on sulfide flotation indicates that pyrite poorly
floats under alkaline condition. Xanthate concentration has a positive
effect on pyrite flotation, but above a pH of 11, pyrite seems to be
strongly depressed, independently of the concentration in xanthate. In this
investigation, aeration and xanthate concentration effects were studied for
pyrite flotation conditioned at pH 11 with lime. Results presented in this
paper include surface infrared analyses and pulp chemistry measurements
which have showed that aeration had a dual effect on pyrite flotation. It
induced pyrite surface activation by oxygen, and oxidation of ferrous iron


Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal


Collections: Engineering; Environmental Management and Restoration Technologies