Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1978-04-13
1982-05-25
Hearn, Brian E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423109, 423150, 75103, C22B 1510, C22B 1924, C01G 3312, C01G 3900
Patent
active
043316352
ABSTRACT:
Copper, nickel and zinc are recovered from sulfide minerals or concentrates thereof by leaching with ammonia at or near atmospheric pressure. A slurry of such minerals or concentrates in an aqueous solution containing free ammonia is passed into a closed leaching vessel or a series of such vessels into which oxygen is admitted. The slurry in such vessel or vessels is mechanically agitated with a vigor input of at least 0.05 horsepower per cubic foot and preferably while recirculating oxygen from above the slurry to well below its surface. The temperature of the slurry is maintained between 50.degree. and 100.degree. C. or up to the boiling temperature at the prevailing pressure, and the pH preferably is in the range from 9 to 11. Solids separated from the leach solution at the conclusion of such leaching operation may be releached for additional copper recovery by a similar leaching procedure in one or a series of leaching vessels. Recoveries of copper, nickel and zinc in the range from 90% to 95% can in many cases be obtained in a leaching time of 3 to 6 hours from ores and concentrates containing one or more of the minerals chalcocite, chalcopyrite, pentlandite and sphalerite. By similarly releaching the solid residue from the primary leaching operation, overall recoveries may in many cases be increased to 99%.
REFERENCES:
patent: 2822263 (1958-02-01), Forward
patent: 3954450 (1976-05-01), Kuhn et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, 2nd Edition, John Wiley, NY (1967), vol. 13, pp. 582-589.
Transactions of AIME-Journal of Metals-Mar. 1955-pp. 457-463.
Forward et al., "Chemistry of the Ammonia Pressure Process for Leaching Ni, Cu and Co from Sherritt Gordon Sulphide Concentrates", Journal of Metals, Mar. 1955, pp. 457-463.
Boldt, J., The Winning of Nickel, Longmans Canada Ltd., Toronto (1967), pp. 290-297, 299-305.
Snyder et al., "Operation and Performance of Bench Scale Reactors", Industrial and Engineering Chemistry, vol. 49, No. 4, Apr. 1957, pp. 689-695.
Perry et al., Chemical Engineer's Handbook, 4th Edition.
Arbiter Nathaniel
Kuhn Martin C.
Atlantic Richfield Company
Hearn Brian E.
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