Selective hydrometallurgical separation of lead from complex lea

Details Selective hydrometallurgical separation of lead from complex lea Selective hydrometallurgical separation of lead from complex lea

1975-06-03

1976-07-13

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75101BE, 75114, 75115, 75120, 423 98, 423 89, C22B 1304

Patent

active

039691063

ABSTRACT:
A quantitative hydrometallurgical process for the selective conversion of lead sulfide (galena) to its sulfate form under ambient conditions of temperature and pressure. The process works in the presence of associated zinc - copper - iron sulfides which survive the process in a relatively unaltered condition. It is directly applicable to ores or derived concentrates of complex sulfide systems. The lead sulfate is isolated from the ore or concentrate system by a brine wash with subsequent conversion to lead chloride. A free concentration of cupric ion is maintained during the leaching stages to act as an oxidation catalyst and to inhibit the dissolution of zinc sulfide. The forward reaction in terms of lead sulfation is controlled by a chlorite-type mineral with both anion and cation exchange capacity added to, or maintained in a dilute sulfuric acid leach cycle. The evolution of hydrogen sulfide is inhibited by the reaction rate under aeration conditions in the presence of a rigidly controlled concentration of soluble iron programmed into the leach system by imposed reducing and oxidizing conditions.

REFERENCES:
patent: 1539714 (1925-05-01), Christensen
patent: 3231503 (1966-01-01), Laue
patent: 3434947 (1969-03-01), Steintreit
patent: 3776826 (1973-12-01), Atadan
patent: 3785944 (1974-01-01), Atwood et al.
patent: 3923616 (1975-12-01), Atadan et al.

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