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Biooxidation of sulphide minerals has become an important method for the pretreatment of refractory gold ores. More over, bioleaching of the mi nerals with thermophilic microorganisms is attracting increasing interest as a promising alternative process. In this study, the biooxidation of an arsenical refractory gold sulphide concentrate using extreme thermophiles is examined. The concentrate contained 100.84 g/t Au, 31.8% pyrite (FeS2), 10.9% arsenopyrite (FeAsS), 0.2% chalcopyrite (CuFeS 2), 37.3% quartz (SiO2) a...

In this study, the boric aci d extraction from colemanite in ammonium chloride was studied and the effects of parameters such as the leaching temperature, ammonium chloride concentration, solid/liquid ratio a nd leaching time were investigated on the boric acid extraction from colemanite. Statistical design of experiments and the analysis of variance were carried out. The experiments were performed in a 500-mL cylindrical glass reactor equipped with a mechanical stirrer, a thermostat for controlling the leaching t...