Sulfate precipitation during oxidative ammonium leach of Cu, Ni,

Details Sulfate precipitation during oxidative ammonium leach of Cu, Ni, Sulfate precipitation during oxidative ammonium leach of Cu, Ni,

1978-05-31

1979-05-08

Hearn, Brian

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204112, 204115, 75103, 75117, 75119, 75120, 423 33, 423109, 423150, C22B 1510, C22B 1924, C22B 2304

Patent

active

041535227

ABSTRACT:
In the recovery of copper, nickel or zinc from sulfide ores by leaching with ammonium sulfate solution containing free ammonia in the presence of oxygen to form a leach solution containing dissolved copper, nickel or zinc ammonia sulfate complex, an alkaline metal hydroxide (preferably calcium hydroxide) is introduced into the leaching operation to precipitate the sulfate ion formed and to release ammonia combined therewith as ammonium ion.

REFERENCES:
patent: 648354 (1900-04-01), Collins
patent: 2576314 (1951-11-01), Forward
patent: 2647830 (1953-08-01), Allen et al.
patent: 2670273 (1954-02-01), Munn
patent: 2726934 (1955-12-01), Forward et al.
patent: 2822263 (1958-02-01), Forward
patent: 2871116 (1959-01-01), Clark
Forward et al. "Chemistry of the Ammonia Pressure Process for Leaching Ni, Cu, Co from Sherritt Gordon Sulphide Concentrates" in Journal of Metals, Mar. 1955 pp. 457-463.

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