Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1986-07-18
1988-01-05
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 40, 75 72, 75 82, 75 84, C22B 704
Patent
active
047174196
ABSTRACT:
The present invention relates to a method for treating iron-bearing slags containing precious metals, particularly slags created in copper and nickel smelting processes, by reducing the slag so that by means of adding a possible sulphidizing agent, the composition of the molten slag is regulated in solidified state to fall within the area where the metallicized, iron-bearing molten copper sulphide is in balance with the metallic copper and the iron-base metal alloy. By means of controlled cooling, the precious metals contained in this molten sulphide having an advantageous liquidus temperature are concentrated into the iron-base metal phase, whereafter the phase containing the precious metals can be separated by means of magnetic separation. After the magnetic separation, a selective hydrometallurgic treatment is carried out in order to recover the precious metals.
REFERENCES:
patent: 3506435 (1970-04-01), Themelis et al.
patent: 4110107 (1978-08-01), Paulson et al.
patent: 4304596 (1981-12-01), Makipirtti et al.
patent: 4334925 (1982-06-01), Kim et al.
patent: 4349383 (1982-09-01), Chaudhuri
Makinen Juho K.
Murden Keith B.
Saari Heikki P.
Andrews Melvyn J.
Outokumpu Oy
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