Treatment of high nickel slimes

Details Treatment of high nickel slimes Treatment of high nickel slimes

1991-02-26

1992-04-28

Niebling, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

75714, 204DIG13, 4236585, B01F 100, C01G 5310

Patent

active

051087219

ABSTRACT:
A two-stage process for treating anode slimes and other residues containing a substantial amount of nickel without significant dissolution of silver and/or selenium in a single autoclave is disclosed. The process comprises, in a first stage, leaching the anode slimes at 15-30% solids in dilute sulphuric acid at a pressure between 4.0 and 5.5 bars and a temperature between 155.degree. C. to 170.degree. C. in the absence of oxygen to solubilize nickel, and in a second stage, without performing a solid liquid separation, leaching the remaining solids at a pressure between 2 and 3.5, preferably about 2.8 bars and a temperature between 110.degree. and 140.degree. C., preferably about 120.degree. C. with oxygen sparging such that the final sulphuric acid concentration is not less than 50 gpl to solubilize copper and tellurium.

REFERENCES:
patent: 2322786 (1943-06-01), Betterton et al.
patent: 4002544 (1977-01-01), Heimala et al.
patent: 4229270 (1980-10-01), Subramanian
patent: 4293332 (1981-10-01), Wang et al.
patent: 4666514 (1987-05-01), Bertha

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