초록 ▼

A method for separating gold and/or silver from copper or other contaminant metals is provided in which a suitable filter membrane (64), particularly a nanofilter, is used to form a retentate (134) containing most of the multivalent metal cyanide complexes and a permeate (135) containing most of the

A method for separating gold and/or silver from copper or other contaminant metals is provided in which a suitable filter membrane (64), particularly a nanofilter, is used to form a retentate (134) containing most of the multivalent metal cyanide complexes and a permeate (135) containing most of the precious metal cyanide complexes. The process is particularly applicable to the recovery of gold and/or silver from ores containing these metals and one or more contaminant metals. The precious metal can thereafter be recovered from the permeate (135) and the metal in the multivalent metal cyanide complex from the retentate (134).

대표청구항 ▼

1. A process for recovering a precious metal from an ore containing the precious metal and a metal other than the precious metal, comprising:contacting the ore with a cyanide-containing leach solution to form a liquid product containing a dissolved monovalent precious metal-cyanide complex and one o

1. A process for recovering a precious metal from an ore containing the precious metal and a metal other than the precious metal, comprising:contacting the ore with a cyanide-containing leach solution to form a liquid product containing a dissolved monovalent precious metal-cyanide complex and one or more dissolved multivalent metal-cyanide complexes and having a pH ranging from about pH 9 to about pH 11; passing at least a portion of the liquid product through a nanofiltration membrane to form a retentate containing a portion of the dissolved monovalent precious metal-cyanide complex and at least most of the one or more dissolved multivalent metal-cyanide complexes and a permeate containing at least most of the dissolved monovalent precious metal-cyanide complex; and thereafter recovering the precious metal in the dissolved monovalent precious metal-cyanide complex from the permeate to form a precious metal product.