Recovery of copper

Details Recovery of copper Recovery of copper

1976-08-25

1978-05-23

Ozaki, G.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

75101R, 75104, 75117, C22B 1508

Patent

active

040910709

ABSTRACT:
Copper is recovered from ores containing sulfidic copper minerals by forming the ore into a dump leach heap, and substantially saturating (i.e. thoroughly wetting) the ore in the heap with an aqueous strong acid solution containing 100 to 400 g/l H.sub.2 SO.sub.4 and 5 to 50 g/l ferric ion. The ore thus saturated is cured in contact with the strong acid solution for a curing period of at least 2 days, and generally from 5 days to 6 months or even longer, depending on the character of the ore and its permeability by the acid solution. The ore in the heap may be run of mine size, or may be coarsely crushed, again depending on permeability to the strong acid solution. After the curing period, the ore in the heap is washed by percolating through it a weak acid solution containing up to 50 g/l H.sub.2 SO.sub.4 and 5 to 50 g/l ferric ion. The wash solutions are collected and treated for copper recovery. Washing is continued until the copper content of the heap has been largely extracted.

REFERENCES:
patent: 2563623 (1951-08-01), Scott
patent: 3260593 (1966-07-01), Zimmerley et al.
patent: 3441316 (1969-04-01), Hannifan et al.
patent: 3574599 (1971-04-01), Ortloff et al.
patent: 3669651 (1972-06-01), Spedden et al.
patent: 3726667 (1973-04-01), Fuchs
patent: 3728430 (1973-04-01), Clitheroe et al.
patent: 3777004 (1973-12-01), Lankenau et al.
patent: 3808306 (1974-04-01), Smith et al.
patent: 3886257 (1975-05-01), Snell
patent: 4017309 (1977-04-01), Johnson

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