Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1984-02-16
1985-05-07
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C22B 1506
Patent
active
045156310
ABSTRACT:
The invention relates to a method for producing blister copper from copper-iron sulphide concentrates, and particularly from concentrates whose sulphur content is insufficient to effect autogenous smelting of the concentrates to matte. The invention is characterized in that the concentrate, together with slag former, is smelted with oxygen-gas or air rich in oxygen in a top blown rotary converter, to form a mixture of a contaminated copper metal phase, magnetite and fayalite slag, whereafter a reductant, preferably coke, is supplied for the reduction of magnetite while supplying heat. After the reduction process, the slag is separated from the formed copper metal phase, which is then refined to blister copper in a manner known per se.
In this respect, a preferred method of refining the copper metal phase, or black copper, is to refine the black copper, subsequent to separating the slag, in the converter by an oxidizing process with the addition of a further slag former, to form blister copper and a slag containing oxidized impurities from the ingoing copper metal phase.
REFERENCES:
patent: 3281236 (1966-10-01), Meissner
patent: 3669646 (1972-06-01), Cullom
patent: 4030915 (1977-06-01), Aaltonen et al.
patent: 4072507 (1978-02-01), Rajcevic et al.
patent: 4144055 (1979-03-01), Petersson et al.
Lindquist Bjorn K. V.
Petersson Stig A.
Andrews M. J.
Boliden Aktiebolag
Ljungman Nils H.
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