On the cathodic reaction coupled with the oxidation of xanthates at the pyrite/aqueous solution interface
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The adsorption of ethyl, propyl and butyl xanthates on pyrite has been studied through electrokinetics, batch adsorption tests, and quantification of Fe2%2b ions in solution. Adsorption isotherms for the three alkyl xanthates indicate that their adsorption to dixanthogen produces Fe2%2b ions in solution and decreases the pyrite zeta potential negatively. It seems that the oxidation reaction of xanthates to dixanthogen on pyrite is coupled with the reduction reaction of surface-ferric hydroxide to ferrous ions, leading to the dissolution of hydrophilic ferric hydroxide and growth of hydrophobic dixanthogen on the surface of pyrite. Flotation of pyrite is presented as a function of pH using various ethyl xanthate concentrations. The floatability results are explained in terms of the surface coverage relationship between ferric hydroxide and dixanthogen, which is pH dependent. © 2005 Elsevier B.V. All rights reserved.
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Adsorption; Flotation; Mineral processing; Pyrite; Xanthate Adsorption; Flotation; Hydrophilicity; Hydrophobicity; Iron; Isotherms; Oxidation; pH effects; Positive ions; Reduction; Batch adsorption tests; Electrokinetics; Mineral processing; Xanthate; Pyrites
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