Abstract
The kinetics of the selective oxidation of Sb in molten Pb-Sb, Pb-Sb-Ag and Pb-Sb-Bi alloys have been examined with the aim of improving methods of treatment of anode slimes from the electrolytic refining of lead. The rate of oxidation was determined by a thermobalance; the results indicate that the rate of oxidation is controlled at the gas-melt interface with an activation energy of 25 ± 2 kcal/mole. A mechanism for the oxidation reaction, involving the intermediate gaseous compound SbO, is proposed and a rate expression has been derived therefrom; rates calculated from this expression are fully in accord with those determined experimentally.
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