Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1983-07-20
1985-05-28
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 26, 75 77, C22B 1300
Patent
active
045198365
ABSTRACT:
A method of processing lead sulphate or lead-zinc sulphide ores, or sulphide concentrates, or mixtures thereof, residing in that said lead sulphide or lead-zinc sulphide ores, or sulphide concentrates, or mixtures thereof are subjected to roasting-and-reduction in an atmosphere of industrial oxygen in the presence of fluxes with addition of recycle products to a desulphurization of 85 to 100%, with the obtaining of a molten slag, in which the weight ratio of the sum of silicon dioxide and aluminium oxide to ferrous oxide is 0.67-1.22:1 and that of the sum of calcium oxide and magnesium oxide to ferrous oxide is 0.22-0.75:1, with subsequent separation of lead and zinc by way of a selective reduction of lead oxides to metal in the course of filtration of the resulting dispersed slag at a temperature of 1100.degree. to 1400.degree. C. through a bed of a carboniferous material.
REFERENCES:
patent: 2820705 (1958-01-01), Warner
patent: 3281237 (1960-10-01), Meissner et al.
patent: 3847595 (1974-11-01), Liang et al.
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patent: 4214897 (1980-07-01), Verhulst et al.
patent: 4388110 (1983-06-01), Jensfelt et al.
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Abdeev Jury M.
Grinin Jury A.
Polyakov Ivan P.
Sannikov Jury I.
Sychev Anatoly P.
Andrews Melvyn J.
Vsesojuzny Nauchno-Issledovatelsky Institut Tsvetnoi Metallurgii
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