Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1975-03-28
1977-04-12
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75116, 75117, 75120, 75121, 423 20, 423 27, 423 41, 299 5, C22B 100
Patent
active
040173097
ABSTRACT:
A technique is provided for leaching particulate ores for recovering metal values. Ore is crushed to less than about one inch with at least 25% being greater than 4 mesh. The crushed ore is mixed with a small amount of acid and the moistened mixture is kept in a curling pile for about two days for dehydration and induration of the ore. The induration is sufficient that the ore can sustain the weight of a thin layer of about one-half to one meter thick without appreciable compacting. The indurated ore is spread on a permeable substrate in a thin layer about one-half to one meter thick. A leaching solution is then percolated through this thin layer to remove the metal values. The initial effluent leach liquor has high metal values and low acid content and is passed to a solvent extraction system where the metal values are recovered. The solvent extraction raffinate, which is high in acid, is recirculated as a leach liquid. Leaching of the thin layer is essentially countercurrent since progressively leaner leach liquids are used.
Leaching of extremely fine ore is provided by mixing with at least 50% particles larger than about 4 mesh.
REFERENCES:
patent: 1825752 (1931-10-01), Mott
patent: 3260593 (1966-07-01), Zimmerley et al.
patent: 3777004 (1973-12-01), Lankenau et al.
patent: 3808306 (1974-04-01), Smith et al.
patent: 3840365 (1974-10-01), Hammes et al.
Holmes & Narver, Inc.
Ozaki G.
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