Purification of aqueous solutions

Details Purification of aqueous solutions Purification of aqueous solutions

C - Chemistry, Metallurgy

25

C

C25C 1/00 (2006.01) C01G 45/02 (2006.01) C22B 3/44 (2006.01) C25B 1/00 (2006.01) C25B 15/08 (2006.01) C25C 1/16 (2006.01) C25C 7/06 (2006.01)

Patent

CA 2134586

ABSTRACT The invention provides a process for the purification of an aqueous solution containing metal ions and which contains divalent manganese cations as an impurity. The process comprises, at a hydrogen ion concentration in the solution of 1 x 10-7- 2 moles/?, oxidizing the divalent manganese (Mn2+) cations to Mn4+ cations to precipitate MnO2 from the solution. The oxidising of the MnO2 cations is catalyzed by carrying out the oxidation in the presence of catalytically active manganese dioxide.

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