Effect of Physisorption of Collecting Agent on Flotation of Pyrite in the Presence of Fe2+ and Fe3+ Ions
S. A. Kondrat'ev, I. A. Konovalov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
Keywords: Pyrite flotation, physisorbed collector, flotation suppression, medium pH
Abstract
Flotation of pyrite is examined as function of pH and ferrous ion concentration. To explain depression of pyrite flotation in the neutral pH range and at high concentration of ferrous ions, the mechanism of physisorption of a collecting agent is used. It is experimentally determined that interaction products of xanthate and ferrous ions possess different velocities of spreading over the gas-water interface dep0ending on their concentrations and on the solution pH. Furthermore, they have different influence on the velocity of liquid removal from the interlayer between mineral particle and gas bubble. The mechanism of physisorption of a collecting agent discloses the causes of suppressed flotation of pyrite in the neutral pH zone and increased pyrite flotation in the alkaline medium.
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