Cyanide leaching method for recovering platinum group metals from a catalytic converter catalyst.
Atkinson-GB; Kuczyns-RJ; Desmond-DP
U S Patent 5,160,711 1992 Nov :1-8
A method for recovering platinum group metals from a catalyst material comprises leaching the material with a cyanide solution at a temperature greater than about 100.degree. C. to form soluble platinum group metal-cyanide complexes in solution. Solids are removed from the resulting pregnant leach solution, and the pregnant leach solution is then heated to a temperature sufficient to decompose the platinum group metal-cyanide complexes and precipitate the platinum group metals.
Mining-industry; Environmental-contamination; Platinum-compounds; Cyanides; Cyanide-compounds; Metal-compounds; Metallurgical-processes; Metallurgy
U.S. Patent No. 5,160,711, Nov. 3, 1992