Abstract
The article addresses the role of products of interaction between xanthate and iron ions in flotation of pyrite at different pH values. It is shown that derivatives of butyl xanthate and iron chloride feature a high spreading rate at the gas-liquid interface and can contribute to removal of the kinetic constraint of the particle-bubble attachment. The effect on the rate of water removal from the interlayer between a mineral particle and a gas bubble depends on the ratio of concentrations and on pH values of the solution. The mechanism of physisorption of a collecting agent is used to explain the suppression of pyrite flotation in a pH-neutral medium and the increased floatability of pyrite in the alkaline range of pH.
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