Process for metal recovery and compositions useful therein
AssigneeGreat Lakes Chemical Corporation
InventorsRodney H. Sergent, Kenneth N. Thanstrom
Life of this patent
Estimating the term…
Abstract
A process for extracting a precious metal or base metal from a source material containing the metal. The process comprises contacting the source material with an aqueous leaching solution containing a leaching agent comprising an N-halohydantoin compound, thereby producing an aqueous leachate containing said metal. Aqueous leaching compositions, and novel electrowinning and other electrodeposition processes are also disclosed.
Claims50
A process for extracting a precious metal or base metal from a source material containing said metal, the process comprising contacting said source material with an aqueous leaching solution containing a leaching agent comprising an N-halohydantoin compound, thereby producing an aqueous leachate containing said metal.
A composition useful in the leaching of a precious or base metal from a source material containing such metal, the composition comprising an aqueous solution containing an acid and a leaching agent comprising an N-halohydantoin, said acid being selected from the group consisting of hydrochloric acid, hydrobromic acid, hydrofluoric acid, hydroiodic acid, nitric acid, sulfuric acid, and acetic acid, the pH of said solution being between about 1 and about 5.
A composition useful in leaching of a precious or base metal from a source of material containing such metal, said composition comprising an aqueous solution containing a base and a leaching agent comprising an N-halohydantoin, said base being selected from the group consisting of potassium hydroxide, sodium hydroxide, calcium hydroxide, and barium hydroxhide, the pH of said solution being between about 7.5 and about 9.5.
A composition which is subject to electrolysis for the electrodeposition of a metal, said composition comprising an N-halohydantoin compound and an anion comprising said metal complexed with halogens derived from reaction of the halohydantalyn compound with a source of the metal.
A process for recovery of a precious metal or base metal comprising direct current electrolysis of an electrowinning solution containing a halohydantoin compound and anions comprising said metal complexed with halogens derived from the reaction of said halohydantoin compound with said metal.
A process for electrodeposition of a precious metal or base metal comprising direct current electrolysis of an electrolytic solution containing an N-halohydantoin compound and anions comprising said metal complexed with halogens.
Dependencies are inferred from the claim text.