Abstract
Oxygen mixed with SO 2 can function as a powerful oxidant in acid solution. This paper summarises basic studies on the mechanism of SO 2/O 2 oxidation, the kinetics of oxidation in acidic media, and potential applications in hydrometallurgy. The SO 2/O 2 system readily oxidises Fe(II) to Fe(III) and provides a simple method of regenerating Fe(III) for leaching minerals like Cu 2S or U 3O 8. It also oxidises As(III), which in the presence of iron(III) enables a stable ferric arsenate compound to be precipitated. A method for the leaching and removal of arsenic from smelter fumes is proposed. Oxidation of Mn(II) to Mn(III)/Mn(IV) oxides by SO 2/O 2 allows manganese impurity to be removed from leach liquors and electrolytes.
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