Abstract
To optimize the industrial processes involving chemical or biological oxidation of arsenopyrite and to control acid rock drainage it is necessary to perform a precise characterization of the mineral surfaces. In this work we have demonstrated that a voltammetric study with carbon paste electrodes (CPE) provide a possible alternative method to allow a rough characterization of the arsenopyrite surface. By these means the presence of sulfur or FeAsO 4 passive layers on the surface is shown, when arsenopyrite is previously oxidized by either chemical, biological and biological assisted methods. The presence of sulfur or FeAsO 4 was confirmed by XRD and IRD surface determinations. On the other hand the heterogeneity of the precipitates formed during the previous oxidation process was detected by CPE-mineral voltammetry studies. These observations were confirmed by SEM photomicrographs of the surface treated arsenopyrite.
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