Exploration of the mechanism of rhodium(III) co-precipitation with copper sulfide (at low rhodium concentrations) incorporating the cationic substitution reaction path
Master Thesis
2007
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University of Cape Town
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Abstract
This study is a preliminary investigation into the mechanism and kinetics of Rh3+ coprecipitation with CuS upon aqueous thiosulphate addition to acidic base metal sulphate solutions, where Rh3+ concentration is two orders of magnitude lower than Cu2+, over 50 - 150 °C. The heterogeneous cationic substitution has been identified as a new precipitation path in metal sulfide co-precipitation, namely, the reaction between more soluble, co-precipitated metal sulphide (CuS) and the less soluble cation in solution (Rh3+), with the large KSP difference providing the chemical driving force.
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McGeorge, B. 2007. Exploration of the mechanism of rhodium(III) co-precipitation with copper sulfide (at low rhodium concentrations) incorporating the cationic substitution reaction path. University of Cape Town.