Abstract
Abstract The oxygen pressure leaching of pyrite has been studied with regard to reaction mechanism by oxygen-18 tracer tests, electrochemical simulation and actual leaching experiments over a range of variables; temperature, 85 to 130°C; pressure, 0 to 976 psi O2 (66.4 atm); and acid concentration, 0.01 to 3M H2SO4. The dissolution mechanism has been found to be electrochemical and is a potentiostatically controlled steady state between sulphate-forming and elemental sulphur-forming anodic reactions:1. FeS2+8H2O→Fe+2+2SO4 =+16H++14e− 2. FeS2+Fe+2+2SOo+2e− Ferric ions are produced primarily by a slow homogeneous reaction:4Fe+2+O2+4H+→4Fe+3+2H2OThe cathodic reaction initially involves the reduction of oxygen:1/2O2+2H++2e−→H2OThis reaction is supplemented by cathodic reduction of ferric ions after these have built up to a significant concentrationThe electrochemical model has been cited to explain the effect of oxygen pressure on the system and acid production or consumption by pyrite during leaching. Resume...
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