Kinetic Studies on the Non-Isothermal Oxidation of Copper Concentrate Particles

摘要

The copper concentrate particles were oxidized in N_2-O_2 gas stream. The effect of oxygen partial pressure and wall temperature on the oxidation behavior of copper concentrate were examined. The desulfurization rate was enhanced by the oxygen partial pressure, and the desulfurization occurred markedly in the region of 30 to 60 cm below the top of the reaction tube. On the basis of X-ray diffraction analysis of the cinder, unreacted core model of copper concentrate covered with an outer product layer of boronite and magnetite was applied to the calculation of the progress of non-isothermal oxidation of copper concentrate particles. The frequency factor k_0 of the interfacial reaction rate constant was determined so as to fit the calculated desulfurization curve to the observed curve. The calculated particle temperature attained the maximum value in the upper part of reaction tube of 30 to 60 cm below the top of the reaction tube. The maximum particle temperature increased with the oxygen partial pressure.