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1. (WO2014195586) METHOD OF RECOVERING COPPER AND PRECIOUS METALS

Pub. No.:    WO/2014/195586    International Application No.:    PCT/FI2014/050461
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Sat Jun 07 01:59:59 CEST 2014
IPC: C22B 3/26
C22B 3/00
C22B 15/00
Applicants: OUTOTEC (FINLAND) OY
Inventors: VALKAMA, Kari
SINISALO, Pia
KARONEN, Janne
HIETALA, Kari
Title: METHOD OF RECOVERING COPPER AND PRECIOUS METALS
Abstract:
The present invention relates to a method of recovering copper and one or more precious metals from copper-bearing sulfide ore or concentrate comprising leaching copper-bearing ore and/or concentrate under atmospheric or slightly pressurized conditions at a temperature below the boiling point of the leach solution in a sulfuric acidic solution in the presence of one or more alkali metal or alkali earth metal halides, whereby the total halide concentration is from 30 to 115 g/L, to dissolve copper and to obtain a leaching liquor comprising copper, sulfur species, and halides in solution. The leaching liquor is then subjected to a solid-liquid separation after which a first aqueous pregnant leach solution and a copper depleted leaching residue are obtained. Copper is purified by solvent extraction from the first aqueous pregnant leach solution to obtain a first copper-containing loaded organic solution and a first aqueous raffinate. The copper containing loaded organic solution is stripped and copper is recovered from a stripping solution that contains trace amounts of chlorides.