MX2007002330A Process for copper
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