Copper recovery from ammoniacal solutions using extraction...

Details Copper recovery from ammoniacal solutions using extraction... Copper recovery from ammoniacal solutions using extraction...

B - Operations, Transporting

01

J

53/291, 252/30

B01J 20/22 (2006.01) C22B 3/00 (2006.01) C22B 15/08 (1985.01)

Patent

CA 1223242

TITLE COPPER RECOVERY FROM AMMONIACAL SOLUTIONS USING EXTRACTION MIXTURE INVENTORS Gordon N. Ritcey En Wei Wong ABSTRACT OF THE DISCLOSURE Improved extraction of copper from aqueous ammoniacal solutions is achieved using a mixed extractant comprising a tertiary carboxylic acid and a 5-alkyl salicylaldoxime. Preferably the loaded organic phase is scrubbed to remove ammonia, stripped with sulfuric acid solution and, after stripping, again scrubbed to remove sulfate and then recycled to the extraction. The process is particularly suitable for treating loaded copper etch solutions which can then be recycled to the etching.

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