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US 11,788,170 B2Granted
Precious metals recovery
AssigneeStillwater Mining Company
InventorsDave Shuck, Jerry Kolstad, Mark Rapkoch, Grenvil Marquis Dunn
Life of this patent
Estimating the term…
Abstract
Discloses a hydrometallurgical process and system for the recovery of precious metals; specifically palladium, rhodium, and platinum metals, at high purity and with limited waste and environmental fouling.
Claims16
A method comprising:
- evaporating a liquid stream comprising an alkali metal chloride and a substituted quaternary amine to form a crystal slurry in at least one evaporator maintained at a boiling temperature between 100° C. and 150° C.;
- contacting the crystal slurry with a stream comprising at least one of palladium, rhodium, and platinum and comprising negligible amounts of copper, iron, nickel, lead, cobalt, aluminum, calcium, bismuth zinc, sulfur, selenium, tellurium, arsenic, ruthenium, silver and gold.
Dependencies are inferred from the claim text.