Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1995-10-10
1997-10-21
McCarthy, Neil
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210724, 210912, 75726, C02F 162
Patent
active
056792590
ABSTRACT:
A method for recovering metals from solutions is described. A particular embodiment of the method concerns recovering copper metal from aqueous solutions containing copper ions, such as ammoniacal circuit-board etching solutions. A working embodiment of the invention comprises first treating a solution containing copper ions with a sufficient amount of an acid to obtain a solution pH of from about 1 to less than about 2.5. A reducing metal, such as iron, is then added to the solution to precipitate metal ions as metals. The reducing metal has a mesh size of about 230 or greater. The metal precipitate is recovered from the solution. The method is generally sufficiently efficient to allow discharge of solutions treated according to the method of the invention into public waste waters wherein the solution has less than about 5 ppm, and preferably less than 2 ppm, metal ions.
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Great Western Chemical Company
McCarthy Neil
Morrison Betsey J.
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