National Research Institute for Metals

Aiko Aoki

Hiroshi Kametani

A method for winning lead from a powdery material consisting of a lead sulfide concentrate or a powdery material containing lead sulfide by passing an electric current across the anode and the cathode of an electrolytic cell partitioned into an anode compartment and a cathode compartment by a diaphragm; which comprises filling the anode compartment with a suspension of the aforesaid powdery material in an aqueous solution of a water-soluble chloride, electrolytically forming the crystalline particles of lead chloride by the anodic oxidation of the suspended particles, separating and refining the crystalline particles of lead chloride from the aqueous solution of the water-soluble chloride, and filling the cathode compartment with a solution of the separated and refined crystalline particles of lead chloride dissolved in an aqueous solution of a water-soluble chloride thereby to deposit lead electrically on the cathode.

Method for electrolytic winning of lead

A method for electrochemically refining copper, which comprises placing a catholyte solution consisting of a copper ion aqueous solution and an anolyte solution consisting of an aqueous dispersion of particles of matte, white metal or blister copper or particles of ferrous hydroxide in an electrolyte in a cathode compartment and the anode compartment, respectively of a galvanic cell partitioned into the cathode compartment and the anode compartment by a diaphragm; and short-circuiting a cathode dipped in the catholytic solution and an anode dipped in the anolyte solution by means of a conductor while maintaining the pH of the catholyte solution at -1 to 5 and the pH of the anolyte solution at 8 to 14, thereby to precipitate pure copper on the cathode.

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Chofu, Japan

Aiko Aoki