Abstract
The reaction for the ammonia, oxidation leaching of chalcopyrite, CuFeS2 + 4NH3 + 17/4 O2 + 2 OH- = Cu(NH3)4 +2 + l/2Fe2O3 + 2 SO4 + H2O was studied using monosize particles in an intensely stirred reactor at moderate oxygen pressures. For dilute solids concentration, the rate is controlled by an electrochemical surface reaction. Under conditions of low stirring speeds and low oxygen pressure, the hematite reaction product passivates the surface and the reaction virtually stops. Even though stirring speed influences the rate of the electrochemical reaction, this effect is due to changes in the morphology of the hematite deposit which alters the surface reaction kinetics, rather than being indicative of mass transfer limitations.
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Formerly Metallurgy Graduate Student, University of Utah,
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Beckstead, L.W., Miller, J.D. Ammonia, oxidation leaching of chalcopyrite —surface deposit effects. Metall Trans B 8, 31–38 (1977). https://doi.org/10.1007/BF02656348
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DOI: https://doi.org/10.1007/BF02656348