On the cathodic reaction coupled with the oxidation of xanthates at the pyrite/aqueous solution interface

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• 作者：A. Ló ; pez Valdivieso ; A.A. Sá ; nchez Ló ; pez and S. Song
• 关键词：Pyrite ; Flotation ; Mineral processing ; Xanthate ; Adsorption
• 刊名：International Journal of Mineral Processing
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：77
• 期：3
• 页码：154-164
• 全文大小：331 K

文摘

The adsorption of ethyl, propyl and butyl xanthates on pyrite has been studied through electrokinetics, batch adsorption tests, and quantification of Fe²⁺ ions in solution. Adsorption isotherms for the three alkyl xanthates indicate that their adsorption to dixanthogen produces Fe²⁺ 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.