Abstract
Adsorption of ethyl xanthate on galena, previously treated with various concentrations of Pb 2+, was examined. The changes resulting on the galena surface were determined by infrared attenuated total reflection spectroscopy (ATR-IR). The results were correlated with electrokinetic and conductivity measurements and UV data of changes in solution. The adsorption of a charged lead-containing species on galena surface was demonstrated over the pH range tested. The maximum of adsorption was observed in the middle pH region, where, according to the distribution diagram for lead, Pb 2+ and Pb (OH) + were the dominant lead species in the solution. Also, an adsorption of EX − ions occurred, regardless of the lead ion species previously adsorbed on the surface. Surface sites available for EX − ion adsorption increased in the presence of Pb 2+, probably relative to the decreased release of lead ions from the galena surface, and to the filling the free cation surface sites. A consequent increase in peak intensity, characteristics of lead ethyl xanthate, was observed. Depending on [Pb 2+] or [KEX] concentration in the solution and on other conditions of the adsorption experiments, the monolayer or multilayer form of lead ethyl xanthate was identified as a dominant product in the galena surface layer.
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