Extraction of zinc and lead from their sulfides

Details Extraction of zinc and lead from their sulfides Extraction of zinc and lead from their sulfides

C - Chemistry, Metallurgy

22

B

53/319, 53/333

C22B 19/00 (2006.01) C22B 13/02 (2006.01)

Patent

CA 1069318

ABSTRACT OF THE DISCLOSURE Sulfidic ores of lead or zinc such as galena or sphaler- ite are smelted under vacuum in the absence of CO2 and oxygen with a flux consisting of solid NaOH or KOH to free the lead or zinc as free metal and to form sodium or potassium disulfides which are used as flux in smelting additional sulfidic ores to liberate more metal and form still higher polysulfides of sodium or potassium also usable as flux up to the pentasulfide form. By the process of the invention, substantially complete use is made of the sulfur atoms initially combined with the lead or zinc to remove the sul- fur combined with said metals. Potassium hydroxide, its lower sul- fur content polysulfides can be reconstituted by exposing to air a leach solution of potassium pentasulfide. -1-

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