Abstract
The kinetics of adsorption of ethyl xanthate at the pyrite-aqueous solution interface have been studied by UV-visible spectroscopy at pH values of 5.5, 7, and 9 under oxidizing conditions. The concentrations of ethyl xanthate and three of its derivatives—ethyl perxanthate, diethyl dixanthogen, and ethyl mono-thiocarbonate—have been monitored in solution as a function of time and pH. Ethyl perxanthate and diethyl dixanthogen are dominant under acidic conditions while ethyl monothiocarbonate is dominant under basic conditions. An adsorption-desorption mechanism has been proposed and tested against the experimental kinetic data. Both the kinetic data and existing microelectrophoresis and flotation studies are consistent with the proposed mechanism. The reactions occurring at the aqueous-mineral interface depend on the solution pH and also on electrical interactions between xanthate and hydroxide groups on the pyrite surface.
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