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US 7,582,136 B2Granted
Recovery of gold from potassium iodide-iodine etching solution
AssigneeUnion Etchants International Inc.
InventorRobert E. Union
Life of this patent
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Abstract
A process for the recovery of gold from a potassium iodide-iodine solution is provided. The gold is precipitated from the solution using a weak acid, (e.g. ascorbic acid), a buffer, (e.g. sodium bicarbonate), and a dye. The precipitate is then removed from the solution resulting in the recovery the gold precipitate and the potassium iodide-iodine solution.
Claims5
A process to recover a precious metal from an etching solution comprising:
- providing a iodine-iodide solution wherein said iodine-iodide solution contains a precious metal;
- providing an acid including ascorbic acid and a buffer and treating said iodine-iodide solution with said acid and said buffer;
- and
- precipitating said precious metal from said iodine-iodide solution to form a precipitate.
1 more element
Dependencies are inferred from the claim text.