EP 1185717 A1 20020313 - OXIDATIVE PRESSURE LEACH RECOVERY OF PRECIOUS METALS USING HALIDE IONS
Title (en)
OXIDATIVE PRESSURE LEACH RECOVERY OF PRECIOUS METALS USING HALIDE IONS
Title (de)
GEWINNUNG VON EDELMETALLEN MITTELS OXIDIERENDER HALID-LAUGUNG UNTER DRUCK
Title (fr)
RECUPERATION DE METAUX PRECIEUX PAR LIXIVIATION OXYDATIVE SOUS PRESSION AU MOYEN D'IONS HALOGENURE
Publication
Application
Priority
- CA 0000438 W 20000427
- CA 2303661 A 20000403
- US 30087899 A 19990428
Abstract (en)
[origin: WO0065111A1] A method for recovering a precious metal from a host material, comprises the steps of subjecting the host material to an oxidative pressure leach process, in the presence of a halide ion constituent, preferably a chloride ion, which is reactive with the precious metal, and at an elevated temperature of at least 170 DEG C to cause at least a portion of the precious metal to be extracted by a leach solution in the form of a precious metal-bearing chloride complex, and recovering the precious metal from the leach solution. When the host material is a smelt malte material including a base metal and a precious metal, said malte is subjected to a first oxidative pressure leach process to recover substantially all of said base metal in the form of at least one sulphate complex into a first leach solution, and then said malte material is subjected to a second oxidative pressure leach process in the presence of a halide ion constituent and at a temperature sufficient to cause at least a portion of said precious metal to be recovered into a second leach solution, from which the precious metal is extracted.
IPC 1-7
C22B 11/00; C22B 11/06; C22B 3/08; C22B 3/10; C22B 7/04; C22B 23/00
IPC 8 full level
C22B 3/08 (2006.01); C22B 3/10 (2006.01); C22B 7/04 (2006.01); C22B 11/00 (2006.01)
CPC (source: EP)
C22B 3/08 (2013.01); C22B 3/10 (2013.01); C22B 7/04 (2013.01); C22B 11/04 (2013.01); C22B 11/044 (2013.01); Y02P 10/20 (2015.11)
Citation (search report)
See references of WO 0065111A1
Designated contracting state (EPC)
FI GR
DOCDB simple family (publication)
WO 0065111 A1 20001102; WO 0065111 B1 20010125; AU 4529500 A 20001110; AU 763167 B2 20030717; EP 1185717 A1 20020313
DOCDB simple family (application)
CA 0000438 W 20000427; AU 4529500 A 20000427; EP 00926596 A 20000427