Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1985-09-12
1986-08-26
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 75, C22B 1100
Patent
active
046080830
ABSTRACT:
The invention relates to a method for recovering the valuable metal content of a mix of contaminated copper raw materials, of which materials at least one is sulphide bearing, and which contain one or more impurities forming the group arsenic, antimony, bismuth, mercury, tin, chlorine and other halogens. The invention is characterized by adjusting the halogen content of the mix so that it is substantially at least stoichiometric in relation to remaining impurities in the group, whereafter the mix is charged to a furnace in which melting can take place and in which the mix is heated to at least 500.degree. C., but beneath the melting points of respective ingredients of the mix, while maintaining good contact with hot gas therewith to expel substantially all of the aforementioned impurities present. The mix is then heated to completely smelt the ingredients present, to form a slag and a copper matte, which latter contains the valuable metal content, whereafter this valuable metal content is recovered with the aid of a suitable, conventional method.
At least one of the copper raw materials present in the mix comprises suitably a halogen-bearing valuable-metal containing product, for example chlorine-bearing ash or slag.
REFERENCES:
patent: 1107310 (1914-08-01), Johnson
patent: 3938989 (1976-02-01), Bell
patent: 4242124 (1980-12-01), Makipirtti
patent: 4344792 (1982-08-01), O'Neill
patent: 4416690 (1983-11-01), Richards
The Institution of Mining and Metallurgy, Advances in Extractive Metallurgy 1977, "Study of Stibnite Chlorination: Thermodynamic and Experimental Aspects", R. Bloise et al, pp. 53-56.
The Institution of Mining and Metallurgy, Advances in Extractive Metallurgy 1977, "Segregation Roasting of Antimony Raw Materials", Ivan Imris, pp. 161-167.
Holmstrom Sven A.
Johansson Leif
Boliden Aktiebolag
Rosenberg Peter D.
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