Nickel recovery from sulfur-deficient mattes

Details Nickel recovery from sulfur-deficient mattes Nickel recovery from sulfur-deficient mattes

1979-04-02

1980-05-06

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25C 108

Patent

active

042016487

ABSTRACT:
A nickel matte in which the atomic ratio of S:(Ni+Co+Cu) is less than 0.7 is fragmented and slurried with water or an aqueous nickel sulfate solution to ensure that the S:(Ni+Co+Cu) ratio for the slurry as a whole exceeds 0.4, the slurry is heated under pressure in the presence of oxygen to form a basic nickel sulfate and the reacted slurry is treated with lime to convert the basic nickel sulfate to nickel hydroxide. The nickel hydroxide is then separated from gypsum by physical separation and thereafter dissolved in spent sulfate electrolyte to generate fresh electrolyte from which nickel can be electrowon.

REFERENCES:
patent: 3909248 (1975-09-01), Ryan et al.
patent: 3975190 (1976-08-01), Meulen et al.
patent: 4153522 (1979-05-01), Arbiter et al.
"Dev. of Pressure Oxidation Leaching of High Grade Ni Matte" by G. Nakazawa et al., 3-1973.

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