Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1986-09-05
1988-03-29
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204128, C25C 114
Patent
active
047341726
ABSTRACT:
The invention relates to a method for selectively recovering lead from complex sulphidic non-ferrous metal concentrates in an electrolytic cell incorporating at least one anode and one cathode and an electrolyte containing chlorine ions, at a temperature beneath the boiling point of the concentrate-containing electrolyte and at a pH beneath 7. Sulphur present in the concentrate is converted substantially into elementary form, and at least the major part of the lead content passes into solution and is then precipitated selectively by cathodic processes. The invention is characterized in that the concentrate is slurried in an electrolyte having a chloride-ion strength above about 2 M, preferably in the range 3-5 M, to form a suspension which is caused to flow into contact with or adjacent the surface of anodes located in the cell; and in that the highest possible anodic current density considering required selectivity is maintained during the electro-winning process.
REFERENCES:
patent: 3673061 (1972-06-01), Kruesl
patent: 4204922 (1980-05-01), Fraser et al.
patent: 4381225 (1983-04-01), Everett
Hedstrom Lars A.
Lindstrom Nils F. R.
Sjoberg Kenneth A. S.
Andrews R. L.
Boliden Aktiebolag
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