Precious metals recovery

摘要

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.

主权项

1. A method comprising processing steps:
contacting a stream comprising at least one of palladium, rhodium, and platinum and being substantially free of copper, iron, nickel, lead, cobalt, aluminum, calcium, bismuth zinc, sulfur, selenium, tellurium, arsenic, ruthenium, silver and gold, with a substituted quaternary amine and alkali metal chloride to form a solids-containing stream and a liquid stream; recovering at least one of the palladium, rhodium and platinum; recovering the substituted quaternary amine and alkali metal chloride from the solids-containing and liquid streams; recycling the recovered substituted quaternary amine and the alkali metal chloride to the contacting step.