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US 8,992,759 B1Granted
Metal refining process using mixed electrolyte
AssigneeHoneywell International Inc.
InventorsPaul P. Silinger, Brett M. Clark, Mark B. Fery
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Abstract
An electrorefining process is disclosed for producing high purity tin having reduced short-term and long-term alpha particle emissions and reduced lead levels. The process may use a mixed acidic electrolytic solution including at least a first electrolyte that provides sulfate ions in the mixed electrolytic solution, such as sulfuric acid, and a second electrolyte that provides halide ions in the mixed electrolytic solution, such as hydrochloric acid.
Claims10
A method for electrorefining tin, the method comprising:
- providing an acidic electrolytic solution comprising:
- a first concentration of sulfate ions;
- a second concentration of halide ions of about 100 ppm to about 1000 ppm;
- and
- a third concentration of stannous ions, wherein the third concentration of stannous ions exceeds 50 g/L;
- and
- electrodepositing the stannous ions from the electrolytic solution onto a substrate to produce a refined tin.
4 more elements
Dependencies are inferred from the claim text.