One step process for the treatment of parkes desilvering...

Details One step process for the treatment of parkes desilvering... One step process for the treatment of parkes desilvering...

C - Chemistry, Metallurgy

22

B

C22B 19/04 (2006.01) C22B 11/02 (2006.01) C22B 13/08 (2006.01) C22B 19/30 (2006.01)

Patent

CA 2041066

A process of treating argentiferous alloy variously called "zinc crust" or "silver crust", obtained in the separation of silver from lead, removes sufficient zinc in one apparatus and process step to ensure the product is suitable as feed to cupellation. Suitable feed is defined as material, when partially oxidised in a cupel to remove impurities from silver, results in a litharge that is liquid at typical cupellation temperatures. The process requires that care be taken to avoid excessive oxidation of the crust during its formation. No preliminary step to upgrade the crust is necessary, avoiding the associated expense and effort.

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