Thermal Analysis and Kinetics of the Chalcopyrite-pyrite Concentrate Oxidation Process
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چکیده
A. Mitovski, N. Štrbac, D. Manasijević, D. Živković, Lj. Balanović, University of Belgrade, Technical Faculty in Bor, Serbia, M. Sokić, A. Daković, ITNMS, Belgrade, Serbia The paper presents the results of experimental investigation of the chalcopyrite-pyrite concentrate oxidation in the air. Characterisation of the initial sample and oxidation products was done by ICP-AES, XRD, EDXRF methods. Phase stability diagrams were constructed for Cu-Fe-S-O system at 25, 450, 650 and 900 °C. Equilibrium composition of the charge for the optimal oxidation process was calculated. DTA-TG analysis was used for monitoring the oxidation process. Kinetic parameters in non-isothermal conditions were determined, based on Kissinger and Ozawa methods. Values of activation energies showed that all stages of the oxidation process occur in the kinetic field.
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