Upgrading the nickel content from low grade nickel lateritic iro

Details Upgrading the nickel content from low grade nickel lateritic iro Upgrading the nickel content from low grade nickel lateritic iro

1976-03-25

1977-01-11

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 3, 423138, 423493, C22B 108

Patent

active

040024636

ABSTRACT:
The nickel content from low grade nickel lateritic iron ore is upgraded by a combined process of segregation and magnetic separation or flotation. Ground ore is thoroughly mixed with a small quantity of calcium carbonate, calcium sulfate and coke and is sprayed with a solution of sodium chloride to make appropriate pellets. These pellets are gradually heated under a neutral or a slightly reducing atmosphere to a temperature of 1050.degree. C maximum for up to 90 minutes. Roasting at this temperature is carried out for a predetermined period of time so as to convert all the nickel from the ore to a metallic condition. The roasted material is cooled, ground in a water medium and finally subjected to a wet or dry magnetic separation or flotation separation treatment so as to obtain a rich nickel concentrate.
The process may be carried without forming pellets merely by thoroughly mixing the ground ore with sodium chloride, limestone, gypsum and coke.

REFERENCES:
patent: 3656935 (1972-04-01), Iwaski
patent: 3701647 (1972-10-01), Yasui et al.
patent: 3725039 (1973-04-01), Jepsen
patent: 3754896 (1973-08-01), Iwaski
patent: 3801306 (1974-04-01), Rey et al.
patent: 3841864 (1974-10-01), Rey et al.
patent: 3856505 (1974-12-01), Ogawa et al.
patent: 3876415 (1975-04-01), Bell et al.
patent: 3914124 (1975-10-01), O'Neill et al.

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