Electrochemical study of adsorption of sodium ethylxanthate on coal pyrite and mineral pyrite

摘要

An electrochemical study of coal pyrite and mineral pyrite was carried out in the presence of various concentrations of sodium ethylxanthate in solutions of pH 3.4 and pH 9.3. A mechanism of charge-transfer adsorption of sodium ethylxanthate has been suggested on the basis of electrochemical cyclic voltammetric (CV) data on mineral pyrite at pH 3.4. This charge-transfer adsorption occurs through a double-electron-transfer oxidation of two xanthate ions to form an adsorbed dixanthogen molecule on the pyrite surface. No clear peak of adsorption of sodium ethylxanthate was observed on mineral pyrite in pH 9.3.