Sherritt Gordon Mines Limited

Nicolaus Zubryckyj

Verner B Sefton

Gerald L Bolton

A process for removing manganese and chloride ions from an aqueous acidic sulphate solution containing zinc, manganese and chloride ions without removing a substantial amount of zinc ions from the solution includes adjusting the free acidity of the solution if necessary to at least about 0.1 molar. The solution is then treated with ozone to oxidize manganese ions to manganese dioxide, and the ozone treatment is continued after the manganese concentration has fallen to a low level to oxidize chloride ions to chlorine gas. The precipitated manganese dioxide is removed from the solution.

Removal of manganese and chloride ions from aqueous acidic zinc sulphate

A process for removing manganese ions from aqueous acidic sulphate solutions containing zinc and manganese ions, without removing a substantial amount of zinc ions from solution, includes treating the solution with ozone to oxidize manganese ions to manganese dioxide, and removing the manganese dioxide from the solution.

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Nicolaus Zubryckyj