One step process for the treatment of Parkes desilvering crust t

Details One step process for the treatment of Parkes desilvering crust t One step process for the treatment of Parkes desilvering crust t

1991-12-17

1993-08-03

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Process control responsive to sensed condition

75 103, 75634, 75665, C22B 1904

Patent

active

052324869

ABSTRACT:
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 oxidized 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.

REFERENCES:
patent: 3774892 (1973-11-01), Althabegoity
patent: 4734129 (1988-03-01), Knight

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