Method of treating the slag from a copper converter

Details Method of treating the slag from a copper converter Method of treating the slag from a copper converter

1986-01-29

1987-11-17

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 63, 75 73, 75 74, C22B 704

Patent

active

047071850

ABSTRACT:
A method of treating the slag from a copper converter comprises introducing the molten slag from a copper converter into a furnace having tuyeres through which air can be blown into the molten slag, blowing into the slag through the tuyeres at least 6% by weight of pulverized coal with air or oxygen-enriched air having an oxygen content of 21 to 40% by volume to separate molten metallic copper from the slag, the amount of the air having a ratio of 0.3 to 0.7 to theoretical combustion of the coal, adding a source of sulfur to the separated copper to form a molten matte, maintaining the matte at a reduced pressure not exceeding 0.6 mm Hg for at least five minutes in a vacuum refining apparatus to remove impurities from the matte by volatilization, and treating the refined matte in a copper converter used for the treatment of a matte produced by a smelting furnace.

REFERENCES:
patent: 3767383 (1973-10-01), Bell et al.
patent: 3984235 (1976-10-01), Petersson et al.
patent: 4032327 (1977-06-01), Donaldson et al.
patent: 4054446 (1977-10-01), Makipirtti
patent: 4199352 (1980-04-01), Jaquay
patent: 4252560 (1981-02-01), Vanjukov et al.

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