Process for metal-enrichment of lead bullion

Details Process for metal-enrichment of lead bullion Process for metal-enrichment of lead bullion

C - Chemistry, Metallurgy

22

B

53/338

C22B 13/06 (2006.01) C22B 7/04 (2006.01)

Patent

CA 1221549

ABSTRACT OF THE DISCLOSURE "A Process for Metal-Enrichment of Lead Bullion" A process for metal-enrichment of lead bullion, wherein an alkali metal-desired metal intermetallic, such as sodium-antimony intermetallic, is added as a refining dross to the bullion and the desired metal is stripped from the dross and recovered as an enriched bullion. The process includes the steps of heating the lead bullion, in which the desired metal is to be recovered, to a temperature between 650°F and 900°F; agitating the molten bullion; adding said alkali metal-desired metal intermetallic to said bullion; mixing said intermetallic into said bullion; adding a stripping reagent for stripping said desired metal from said intermetallic; forming a desired metal-enriched lead bullion and a residue dross substantially void of said desired metal; and separating said enriched bullion from said residue dross. The process may also require a cleansing step to cleanse said enriched lead bullion of any said alkali metal in solution. Through the control of temperaure, additions of stripping and cleansing reagents and agitation, the process provides economies of materials, energy, time and labor over conventional metal recovery processes.

439977

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