Electrochemical Characterization of Galena Under Simulated Carbonate Rich Weathering Conditions

An electrochemical and mineralogical study of galena oxidation was carried out under similar conditions to those found on semiarid carbonate rich soils, which are characteristic of important Mexican mining sites. Investigation of galena behavior in calcareous and alkaline conditions is important to establish strategies for remediation, prevention or control of pollution associated with weathering of this mineral. Voltammetric analyses of galena oxidation lead to the proposition that Pb(OH)2 and Pb1-xS1-y layers are formed initially. Subsequently, oxidation of these species produces a PbO2 layer and SO42-. Electrochemical and mineralogical results indicate a low mobility of Pb, due to Pb(OH)2 and PbCO3 formation during a slow oxidation process