C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/279, 53/300
C22B 15/06 (2006.01) C22B 7/04 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1085620
ABSTRACT OF THE DISCLOSURE In the processing of sulphidic copper ores containing as impurities other valuable metals, it is desirable to first try to separate the copper from the other metals. The copper may then be more easily purified and the remaining metals may be recovered. There is no hydro- or pyro-metallurgical process for so treating these ores. The present in- vention seeks to overcome this drawback by providing a process for the production of blister copper from copper ores or concentrates which contain harmful or economically significant amounts of other nonferrous metals com- prising using flash smelting, known per se, for the primary smelting of the concentrate to produce a matte or metal or both containing 70-98% Cu and a slag containing less than 1% S from the concentrate; recycling flying dust to the feed, reducing the produced slag containing less than 1% S in an electric furnace by means of coke at a temperature of 1300-1550°C to a copper concentration of less than 0.5% and mainly into a copper-lead-iron alloy; converting mattes, raw metals or raw metal alloys or a mixture thereof produced in the flash smelting furnace and the electric furnace into blister copper; feeding slag produced therein and containing less than 1% S together with the slag from the flash smelting furnace into the electric slag purification furnace; purifying the blister copper obtained from the converter into anode copper in an anode furnace; and feeding the produced flying dust, which has a high nonferrous metal content including zinc and lead, but a low content of copper, as a raw material into the process for producing the metal.
272384
Aaltonen Olavi A.
Juusela Jyrki T.
Saari Heikki P.
Tuominen Tapio K.
Fetherstonhaugh & Co.
Outokumpu Oy
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