Measurement of reaction enthalpy during pressure oxidation of sulphide minerals |
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| Authors: | I Bylina L Trevani S C Mojumdar P Tremaine V G Papangelakis |
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| Institution: | 1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada
2. Chemistry Department, University of Guelph, Guelph, ON, N1G 2W1, Canada
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| Abstract: | A calorimetric method for determining the enthalpy of the aqueous oxidation of sulfide minerals at high temperatures and oxygen pressures has been developed and evaluated under conditions relevant to industrial pressure oxidation operations. This information is important for heat balance calculation and optimization of the pressure reactor design. Experiments were carried out on a differential scanning calorimeter (DSC) with a commercial mixing cell. Enthalpy measured during oxidative dissolution of pyrite (Valdenegrillos, Spain), pentlandite with pyrrhotite (Sudbury, Ontario, Canada) and impure chalcopyrite (Victoria, Australia) minerals at 150°C and partial oxygen pressures of 3.4 and 5.5 MPa have been performed and found to be consistent with theoretical estimations. |
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