Method of recovering metals and producing a secondary slag from

Details Method of recovering metals and producing a secondary slag from Method of recovering metals and producing a secondary slag from

1996-06-14

1997-05-06

Marcheschi, Michael

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75627, 75629, 75640, 106789, 501155, C21B 1500

Patent

active

056266464

ABSTRACT:
A method of recovering metals and producing a secondary slag from base metal smelter slag produced by a copper or nickel smelter includes mixing the smelter slag with at least one reducing agent selected from the group consisting of carbon and aluminum, said carbon (if present) being from about 1% to about 10% by weight of the slag and said aluminum (if present) being from about 5 to about 30% by weight of the slag, and with from zero to about 60% calcium oxide by weight of the slag. The mixture is heated above the eutectic melting point thereof directly and to ignition temperature aluminothermically (if aluminum is present as reducing agent) to reduce the iron silicate to ferrosilicon containing substantially all the copper, nickel and cobalt which was in the smelter slag and form a secondary slag comprising at least one compound selected from the group consisting of calcium silicate, calcium aluminate and calcium iron aluminum silicate. The ferrosilicon is then separated from the secondary slag.

REFERENCES:
patent: 3857700 (1974-12-01), Ammann et al.
patent: 4001011 (1977-01-01), Agarwal et al.
patent: 4036636 (1977-07-01), Ammann et al.
patent: 4043804 (1977-08-01), Lindblad

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