Process for upgrading copper sulphide residues containing nickel

Details Process for upgrading copper sulphide residues containing nickel Process for upgrading copper sulphide residues containing nickel

1997-10-24

1999-11-30

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 37, 4231504, C22B 308, C01G 312, C01G 4902

Patent

active

059935146

ABSTRACT:
There is disclosed a process for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte undergoes one or more steps of sulphuric acid leaching at atmospheric pressure to produce a nickel sulphate solution and an iron and/or arsenic containing copper-rich sulphide residue. The copper-rich sulphide residue is repulped in sulphuric acid solution to selectively redissolve most of the iron and arsenic and the iron and arsenic containing solution is separated from the copper-rich residue. The iron and arsenic are largely precipitated from the leach solution in a pressure hydrolysis step and the iron and arsenic containing precipitate is separated and discarded. The iron and arsenic-depleted solution is recombined with the copper-rich sulphide residue from the acid repulp step and the resulting slurry is treated in a non-oxidizing pressure leach in which nickel arsenic and iron are extracted. The process produces a nickel sulphate solution containing low levels of copper, iron and arsenic and a copper sulphide product containing low levels of nickel, iron, arsenic and other impurities.

REFERENCES:
patent: 3616331 (1971-10-01), O'Neill
patent: 3741752 (1973-06-01), Evans et al.
patent: 4323541 (1982-04-01), Saarinen et al.
patent: 5344479 (1994-09-01), Kerfoot et al.
patent: 5628817 (1997-05-01), Fugleberg et al.

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