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Peroxygens find use in a number of different applications within the cobalt/ nickel processing sector.
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In the Sheritt-Gordon process for nickel and cobalt recovery, hydrogen peroxide is used to destroy excess unrecovered sulphide which can cause potential health and safety hazards in downstream processing of waste streams from the process.
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Hydrogen peroxide can also be used to as a pretreatment polishing step to ensure complete removal of iron from the leach solutions generated in the acid pressure leach stage as well as ensuring all cobalt present in the pregnant liquor is in the lowest oxidation state prior to solvent extraction.
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Hydrogen peroxide is used to pre-treat alkali pregnant liquor prior to solvent extraction for the separation of cobalt from nickel. The peroxide is used to ensure full conversion of the Co(II) to Co(III) and maximize the extraction of cobalt into the organic phase.
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Caro’s acid can be used to ensure quantitative dissolution of cobalt sulphides for subsequent purification stages such as electro-refining for the production of cobalt metal.
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Caro’s acid can be used to condition acid nickel and cobalt solutions to remove manganese impurities prior to solvent extraction to ensure a pure final product.
By controlling the pH of the solution it is possible to selectively precipitate a readily filterable pure manganese dioxide.
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