Abstract
A kinetic model for leaching particulate metals in a batch system was developed. The leaching mechanism was analyzed by solving a series of ordinary differential equations relating heterogeneous reaction kinetics at the solid/liquid interface to mass transfer of reactant and products. Special emphasis was given to the effects of substrate surface area changes and initial particle distribution on the overall leaching rate. The dissolution of gold powders in acidic solution with bromine as an oxidant was used as a model system. The effects of particle size. particle distribution, chemical reaction order, rate constant and mass transfer coefficient on the overall metal powder dissolution rate are analyzed and discussed.
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