Process for recovery of copper

Details Process for recovery of copper Process for recovery of copper

1976-06-30

1977-06-28

Ozaki, George T.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75104, 75115, 75117, 423 41, C22B 1508

Patent

active

040323307

ABSTRACT:
A process for the leaching and recovery of copper values from copper-containing material which comprises vat leaching a sulfidic copper-containing material with an aqueous acidic ferric sulfate leach solution initially containing at least 10 gpl ferric ion to form a copper pregnant leach solution containing substantially less than 10 gpl ferric ion and a corresponding increase in ferrous ion concentration, extracting said leach solution with an extractant selective to copper and non-selective to iron to strip the copper values from said leach solution, adjusting the acid content of the stripped leach solution to between about 10 to 20 gpl to form an acidic leach solution, passing said acidic stripped leach solution through at least one mineral dump containing oxidized copper for a time sufficient to cause reoxidation of ferrous ion to restore the concentration of ferric ion to at least about 10 gpl, adding sufficient sulfuric acid to the dump off-solution to cause said solution to have an acid concentration of from about 10 to about 20 gpl, and recycling said acidic ferric sulfate leach solution to the vat leaching operation.

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patent: 3753691 (1973-08-01), Grover et al.
patent: 3886257 (1975-05-01), Snell

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