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Recovery of Lead and Sulfur from Galena Concentrate Using a Ferric Sulfate Leach.

Haver FP; Uchida K; Wong MM

NTIS: PB 190 968 :13 pages

10008961

A procedure is described for recovering both lead and sulfur from galena flotation concentrate, comprising the following steps: (1) aqueous oxidation of the concentrate, using ferric sulfate to convert lead sulfide to sulfate and to give elemental sulfur; (2) regeneration of the ferric sulfate by electrolysis in a diaphragm cell; (3) treatment of the leach residue with ammonium carbonate solution to change the lead to an acid-soluble form and to produce ammonium sulfate as a byproduct; (4) solution of the lead carbonate in hydrofluosilicic acid followed by electrolysis to recover the lead as metal and regenerate the acid; and (5) extraction of the elemental sulfur from the final residue with an organic solvent. About 90 percent of the lead can be recovered by the above method as 99.9-percent-pure metal, together with two-thirds of the sulfur-- half in the elemental form and half as ammonium sulfate.

19700101

IH; Report of Investigation;

1970

PB-190968

A03

RI 7360

RERC;

NTIS: PB 190 968