Method for recovering zinc from a sulfidic zinc source

Details Method for recovering zinc from a sulfidic zinc source Method for recovering zinc from a sulfidic zinc source

1983-11-08

1984-10-16

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204114, 75 86, 75109, 75120, 23304, 23305F, 23295R, C25C 116

Patent

active

044773234

ABSTRACT:
A method for processing a sulfidic zinc source to recover metallic zinc wherein the source is leached with an electrolysis cell acid, the leaching product is separated into a liquor and a primary leaching residue, followed by drying and smelting of the dried leaching residue. The improvements of the present invention are directed primarily to the treatment of the liquor recovered from the leaching stage, and involve crystallizing out Fe.sup.2+ from the liquor as a ferrous sulfate hydrate in a crystallization stage, separating the filtrate from the crystallization stage in a first separation stage to produce a filtrate and a residue, neutralizing and oxidizing the separated filtrate from the crystallization stage to precipitate the remaining Fe.sup.2+ in a precipitation stage, separating the filtrate from the precipitation stage in a second separation stage and purifying the separated filtrate from the second separation stage before passing it to the electrolysis cell.

REFERENCES:
patent: 4379037 (1983-04-01), Bolton et al.

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