Process for cooper electrowinning and electrorefining
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United States of America Patent
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Oct 23, 2012
Grant Date -
Feb 4, 2010
app pub date -
Aug 23, 2005
filing date -
Aug 23, 2004
priority date (Note) -
Expired
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Abstract
A method of electrowinning or electrorefining copper from a copper electrolyte solution which contains chloride ions, the method comprising the steps of: (a) forming a polyacrylamide solution by dissolving polyacrylamide, having a molecular weight range of 5,000 to 20,000,000 Daltons, in an acidic medium and under conditions to form a polyacrylamide block copolymer having blocks of carboxyl groups dispersed along the polymer backbone; (b) introducing the polyacrylamide solution into an electrolytic cell containing the copper electrolyte solution at a polyacrylamide concentration of 0.01-10 mg/L; and (c) electroplating copper from the copper electrolyte solution to form a copper cathode.
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