Electrochemical processing

Details Electrochemical processing Electrochemical processing

C - Chemistry, Metallurgy

25

C

C25C 1/18 (2006.01) C22B 3/16 (2006.01) C25B 1/18 (2006.01) C25B 1/21 (2006.01) C25B 1/30 (2006.01) C25C 1/16 (2006.01) C25C 7/06 (2006.01) E21C 41/00 (2006.01)

Patent

CA 2364953

Using a solution mining procedure, an ore (10) is treated with a solution of acetic acid and hydrogen peroxide so as to form a leachate containing lead ions. Lead ions (and other metal ions such as zinc and manganese) are stripped (22, 24, 26) by solvent extraction from the leachate to form separate aqueous solutions. The aqueous solution containing lead ions is treated electrochemically in the anodic compartment of a separated electrochemical cell (42) to form a precipitate of lead oxide. Manganese dioxide can be produced similarly (72). A precipitate of zinc hydroxide can be formed in the cathode compartment of a separated electrochemical cell (56). In the cells (42, 72) extracting lead ions and manganese ions, the cathode compartment is used to generate hydrogen peroxide (for use in making the leachant), either directly or indirectly.

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