CA2617415A1 - Method for thiosulfate leaching of precious metal-containing materials - Google Patents
Method for thiosulfate leaching of precious metal-containing materials Download PDFInfo
- Publication number
- CA2617415A1 CA2617415A1 CA002617415A CA2617415A CA2617415A1 CA 2617415 A1 CA2617415 A1 CA 2617415A1 CA 002617415 A CA002617415 A CA 002617415A CA 2617415 A CA2617415 A CA 2617415A CA 2617415 A1 CA2617415 A1 CA 2617415A1
- Authority
- CA
- Canada
- Prior art keywords
- leach solution
- precious metal
- thiosulfate leach
- pregnant
- thiosulfate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010970 precious metal Substances 0.000 title claims abstract 33
- 238000000034 method Methods 0.000 title claims abstract 30
- 239000000463 material Substances 0.000 title claims 7
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 title abstract 2
- 238000002386 leaching Methods 0.000 title 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract 6
- 229910021529 ammonia Inorganic materials 0.000 claims abstract 3
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 claims 48
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims 10
- 229910001882 dioxygen Inorganic materials 0.000 claims 10
- 239000003463 adsorbent Substances 0.000 claims 5
- 239000003638 chemical reducing agent Substances 0.000 claims 5
- 239000007789 gas Substances 0.000 claims 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 claims 3
- 239000003153 chemical reaction reagent Substances 0.000 claims 3
- RWSOTUBLDIXVET-UHFFFAOYSA-M hydrosulfide Chemical compound [SH-] RWSOTUBLDIXVET-UHFFFAOYSA-M 0.000 claims 3
- KRURGYOKPVLRHQ-UHFFFAOYSA-L trithionate(2-) Chemical compound [O-]S(=O)(=O)SS([O-])(=O)=O KRURGYOKPVLRHQ-UHFFFAOYSA-L 0.000 claims 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims 2
- 229910001431 copper ion Inorganic materials 0.000 claims 2
- 239000007800 oxidant agent Substances 0.000 claims 2
- 229920001021 polysulfide Polymers 0.000 claims 2
- 239000005077 polysulfide Substances 0.000 claims 2
- 150000008117 polysulfides Polymers 0.000 claims 2
- 230000001172 regenerating effect Effects 0.000 claims 2
- 150000004763 sulfides Chemical class 0.000 claims 2
- 125000000101 thioether group Chemical group 0.000 claims 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- 238000005363 electrowinning Methods 0.000 claims 1
- 150000002500 ions Chemical class 0.000 claims 1
- 239000002244 precipitate Substances 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 239000008151 electrolyte solution Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000011819 refractory material Substances 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
- C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/42—Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
Claims (27)
1. A process for recovering a precious metal from a precious metal-containing material, comprising:
(a) contacting the precious metal-containing material with a thiosulfate leach solution to solubilize the precious metal and form a pregnant thiosulfate leach solution containing solubilized precious metal;
(b) maintaining a dissolved molecular oxygen content in at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution at or below about 1 ppm to inhibit the formation of trithionate and tetrathionate; and (c) recovering the solubilized precious metal from the pregnant thiosulfate leach solution.
(a) contacting the precious metal-containing material with a thiosulfate leach solution to solubilize the precious metal and form a pregnant thiosulfate leach solution containing solubilized precious metal;
(b) maintaining a dissolved molecular oxygen content in at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution at or below about 1 ppm to inhibit the formation of trithionate and tetrathionate; and (c) recovering the solubilized precious metal from the pregnant thiosulfate leach solution.
2. The process of Claim 1, wherein, in the maintaining step (b), the at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution is maintained in an atmosphere that is at least substantially free of molecular oxygen, the atmosphere is substantially inert and includes at least about 85 vol. %
molecular nitrogen.
molecular nitrogen.
3. The process of Claim 1, wherein the contacting step (a) occurs in a reactor and the pregnant thiosulfate leach solution is maintained in a molecular oxygen depleted atmosphere after removal from the reactor.
4. The process of Claim 1, wherein, in the maintaining step (b), a gas containing no more than about 5 vol. % oxidants is sparged through the pregnant thiosulfate leach solution.
5. The process of Claim 1, wherein, in the contacting step (a), the thiosulfate lixiviant contains less than 20 ppm of copper ion and less than 0.05 M of ammonia.
6. The process of Claim 1, wherein the pregnant thiosulfate leach solution comprises polythionates and further comprising after contacting step (a) and before maintaining step (b):
(c) maintaining the pregnant thiosulfate leach solution at a temperature in the range of from about 60 to about 150 °C in an environment that is substantially free or completely free of molecular oxygen to convert at least most of the polythionate to thiosulfate.
(c) maintaining the pregnant thiosulfate leach solution at a temperature in the range of from about 60 to about 150 °C in an environment that is substantially free or completely free of molecular oxygen to convert at least most of the polythionate to thiosulfate.
7. A precious metal recovered by the process of Claim 1.
8. A process for recovering a precious metal from a precious metal-containing material, comprising:
(a) contacting the precious metal-containing material with a thiosulfate leach solution to solubilize the precious metal and form a pregnant thiosulfate leach solution containing solubilized precious metal;
(b) maintaining a dissolved molecular oxygen content in at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution at or below about 1 ppm to inhibit the formation of trithionate and tetrathionate; and (c) recovering the solubilized precious metal from the pregnant thiosulfate leach solution, wherein the pregnant thisoulfate leach solution during step (c) comprises at least about 0.01M sulfite.
(a) contacting the precious metal-containing material with a thiosulfate leach solution to solubilize the precious metal and form a pregnant thiosulfate leach solution containing solubilized precious metal;
(b) maintaining a dissolved molecular oxygen content in at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution at or below about 1 ppm to inhibit the formation of trithionate and tetrathionate; and (c) recovering the solubilized precious metal from the pregnant thiosulfate leach solution, wherein the pregnant thisoulfate leach solution during step (c) comprises at least about 0.01M sulfite.
9. A process for recovering a precious metal from a precious metal-containing material, comprising:
(a) contacting the precious metal-containing material with a thiosulfate leach solution to dissolve the precious metal and form a pregnant thiosulfate leach solution containing dissolved precious metal;
(b) after the contacting step (a), maintaining a dissolved molecular oxygen content in at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution at or below about 1 ppm to inhibit the formation of trithionate and tetrathionate; and (c) recovering the dissolved precious metal from the pregnant thiosulfate leach solution.
(a) contacting the precious metal-containing material with a thiosulfate leach solution to dissolve the precious metal and form a pregnant thiosulfate leach solution containing dissolved precious metal;
(b) after the contacting step (a), maintaining a dissolved molecular oxygen content in at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution at or below about 1 ppm to inhibit the formation of trithionate and tetrathionate; and (c) recovering the dissolved precious metal from the pregnant thiosulfate leach solution.
10. The process of Claim 9, wherein, in the maintaining step (b), the at least one of the thiosulfate leach solution and the pregnant thiosulfate leach solution is maintained in an atmosphere that is at least substantially free of molecular oxygen, the atmosphere is substantially inert and includes at least about 85 vol. %
molecular nitrogen.
molecular nitrogen.
11. The process of Claim 9, wherein the contacting step occurs in a reactor and the pregnant thiosulfate leach solution is maintained in a molecular oxygen depleted atmosphere after removal from the reactor.
12. The process of Claim 9, wherein, in the maintaining step (b), a gas containing no more than about 5 vol. % oxidants is sparged through the pregnant thiosulfate leach solution.
13. The process of Claim 9, wherein, in the contacting step (a), the thiosulfate lixiviant contains less than 20 ppm of copper ion and less than 0.05M of ammonia.
14. The process of Claim 9, wherein at least one of the pregnant thiosulfate leach solution and a barren thiosulfate leach solution derived therefrom comprises polythionates and further comprising:
(d) converting the polythionates in the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution to thiosulfate by performing at least one of the following substeps:
(D1) contacting the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution with a polythionate reductant; and (D2) maintaining the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution at a temperature of from about 60 to about 150°C.
(d) converting the polythionates in the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution to thiosulfate by performing at least one of the following substeps:
(D1) contacting the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution with a polythionate reductant; and (D2) maintaining the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution at a temperature of from about 60 to about 150°C.
15. The process of Claim 14, wherein substep (D1) is performed.
16. The process of Claim 15, wherein the reductant is a sulfide-containing reagent.
17. The process of Claim 16, wherein the sulfide-containing reagent is at least one of (i) a polysulfide other than a bisulfide, (ii) a bisulfide, and (iii) a sulfide other than a bisulfide and a polysulfide.
18. The process of Claim 17, further comprising:
(e) adjusting at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution to a pH of from about pH 7 to about pH 12;
and (f) contacting the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution with a gas including at least about 5 vol. %
molecular oxygen to oxidize any of the sulfides remaining.
(e) adjusting at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution to a pH of from about pH 7 to about pH 12;
and (f) contacting the at least one of the pregnant thiosulfate leach solution and the barren thiosulfate leach solution with a gas including at least about 5 vol. %
molecular oxygen to oxidize any of the sulfides remaining.
19. The process of Claim 18, wherein at least a portion of the dissolved precious metal is precipitated during step (D1) and wherein at least most of the precipitated precious metal is redissolved in step (f).
20. The process of Claim 19, wherein at least most of the dissolved precious metal is adsorbed by an adsorbent and further comprising:
(g) stripping with a polythionate-containing eluant the adsorbed precious metals from the adsorbent to form a precious metal-containing eluate, and (h) thereafter regenerating the adsorbent by contacting the adsorbent with the polythionate reductant to reduce any adsorbed polythionate ions on the adsorbent to thiosulfate and/or sulfate ions.
(g) stripping with a polythionate-containing eluant the adsorbed precious metals from the adsorbent to form a precious metal-containing eluate, and (h) thereafter regenerating the adsorbent by contacting the adsorbent with the polythionate reductant to reduce any adsorbed polythionate ions on the adsorbent to thiosulfate and/or sulfate ions.
21. The process of Claim 20, wherein, in the thereafter regenerating step (h), the polythionate reductant is a sulfide and/or sulfite.
22. The process of Claim 20, wherein, in the recovering step (c), the dissolved precious metal is recovered from the precious metal-containing eluate by electrowinning.
23. The process of Claim 22, wherein at least most of the dissolved precious metal is maintained in solution in substep (D1).
24. The process of Claim 15, wherein the polythionate reductant is a sulfite-containing reagent.
25. The process of Claim 16, wherein step (D1) is performed at a pH of from about pH 5.5 to about pH 12 and wherein at least most of the dissolved precious metal is precipitated during step (D1) and further comprising:
(e) removing at least most of the precious metal-containing precipitate from the pregnant thiosulfate leach solution to form the barren thiosulfate leach solution;and (f) contacting the barren thiosulfate leach solution with a gas including at least about 5 vol. % molecular oxygen to oxidize any of the sulfides remaining.
(e) removing at least most of the precious metal-containing precipitate from the pregnant thiosulfate leach solution to form the barren thiosulfate leach solution;and (f) contacting the barren thiosulfate leach solution with a gas including at least about 5 vol. % molecular oxygen to oxidize any of the sulfides remaining.
26. The process of Claim 15, wherein step (D2) is performed.
27. A precious metal recovered by the process of Claim 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20547200P | 2000-05-19 | 2000-05-19 | |
| US60/205,472 | 2000-05-19 | ||
| CA002409378A CA2409378C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002409378A Division CA2409378C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2617415A1 true CA2617415A1 (en) | 2001-11-22 |
| CA2617415C CA2617415C (en) | 2010-01-12 |
Family
ID=22762320
Family Applications (11)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2620644A Expired - Lifetime CA2620644C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA002617415A Expired - Lifetime CA2617415C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2745806A Expired - Lifetime CA2745806C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2664756A Expired - Fee Related CA2664756C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA002409378A Expired - Fee Related CA2409378C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2745933A Expired - Lifetime CA2745933C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2864359A Expired - Fee Related CA2864359C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2756715A Expired - Fee Related CA2756715C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2745928A Abandoned CA2745928A1 (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2617457A Expired - Fee Related CA2617457C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2698578A Expired - Lifetime CA2698578C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2620644A Expired - Lifetime CA2620644C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
Family Applications After (9)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2745806A Expired - Lifetime CA2745806C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2664756A Expired - Fee Related CA2664756C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA002409378A Expired - Fee Related CA2409378C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2745933A Expired - Lifetime CA2745933C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2864359A Expired - Fee Related CA2864359C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2756715A Expired - Fee Related CA2756715C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2745928A Abandoned CA2745928A1 (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2617457A Expired - Fee Related CA2617457C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2698578A Expired - Lifetime CA2698578C (en) | 2000-05-19 | 2001-05-18 | Method for thiosulfate leaching of precious metal-containing materials |
Country Status (12)
| Country | Link |
|---|---|
| US (7) | US6660059B2 (en) |
| AP (3) | AP1714A (en) |
| AR (1) | AR029927A1 (en) |
| AU (4) | AU2001274393B2 (en) |
| CA (11) | CA2620644C (en) |
| CL (2) | CL2014001620A1 (en) |
| GB (1) | GB2379212B (en) |
| MX (4) | MX347624B (en) |
| OA (1) | OA12272A (en) |
| PE (1) | PE20020002A1 (en) |
| WO (1) | WO2001088212A2 (en) |
| ZA (1) | ZA200209063B (en) |
Families Citing this family (63)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6660059B2 (en) * | 2000-05-19 | 2003-12-09 | Placer Dome Technical Services Limited | Method for thiosulfate leaching of precious metal-containing materials |
| US20050126923A1 (en) * | 2001-07-25 | 2005-06-16 | Phelps Dodge Corporation | Process for recovery of copper from copper-bearing material using medium temperature pressure leaching, direct electrowinning and solvent/solution extraction |
| US6451088B1 (en) * | 2001-07-25 | 2002-09-17 | Phelps Dodge Corporation | Method for improving metals recovery using high temperature leaching |
| US6451089B1 (en) * | 2001-07-25 | 2002-09-17 | Phelps Dodge Corporation | Process for direct electrowinning of copper |
| CA2363762A1 (en) * | 2001-11-23 | 2003-05-23 | Golden Wave Resources Inc. | Electromagnetic pyrolysis metallurgy |
| AUPS334402A0 (en) * | 2002-07-02 | 2002-07-25 | Commonwealth Scientific And Industrial Research Organisation | Process for recovering precious metals |
| JP4144311B2 (en) * | 2002-10-08 | 2008-09-03 | 住友金属鉱山株式会社 | Methods for separating and recovering platinum group elements |
| AU2007211912B2 (en) * | 2002-11-15 | 2008-01-31 | Placer Dome Technical Services Limited | Method for thiosulfate leaching of precious metal-containing materials |
| US7722840B2 (en) * | 2002-11-15 | 2010-05-25 | Placer Dome Technical Services Limited | Method for thiosulfate leaching of precious metal-containing materials |
| EP1433860A1 (en) * | 2002-12-23 | 2004-06-30 | Paques B.V. | Process for regenerating thiosulphate from a spent thiosulphate gold leachant |
| US7285256B2 (en) * | 2003-04-04 | 2007-10-23 | Newmont Usa Limited | Precious metal recovery using thiocyanate lixiviant |
| US20040237721A1 (en) * | 2003-05-29 | 2004-12-02 | Morteza Baghalha | Anoxic leaching of precious metals with thiosulfate and precious metal oxidants |
| MXPA03006955A (en) * | 2003-08-04 | 2005-02-09 | Univ Autonoma Metropolitana | Silver and gold leaching and recovery process with electro-oxidised thiourea solutions. |
| US7736487B2 (en) | 2004-10-29 | 2010-06-15 | Freeport-Mcmoran Corporation | Process for recovery of copper from copper-bearing material using pressure leaching, direct electrowinning and solution extraction |
| EP1805336B1 (en) | 2004-10-29 | 2012-08-15 | Freeport-McMoran Corporation | Process for recovery of copper from copper-bearing material using pressure leaching, direct electrowinning and solvent/solution extraction |
| US7604783B2 (en) | 2004-12-22 | 2009-10-20 | Placer Dome Technical Services Limited | Reduction of lime consumption when treating refractor gold ores or concentrates |
| DOP2006000250A (en) * | 2005-11-10 | 2007-07-15 | Barrick Gold Corp | GENERATION OF IN SITU TIOSULFATE IN PRECIOUS METAL RECOVERY |
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| US7985277B2 (en) * | 2006-03-03 | 2011-07-26 | Metal Asia International, Ltd. | Process for extracting gold from gold-bearing ore |
| US8061888B2 (en) | 2006-03-17 | 2011-11-22 | Barrick Gold Corporation | Autoclave with underflow dividers |
| US7972413B2 (en) * | 2006-04-07 | 2011-07-05 | Metal Asia International Ltd. | Precious metal recovery from solution |
| AU2007266303B2 (en) * | 2006-05-25 | 2012-03-29 | Commonwealth Scientific & Industrial Research Organisation | Process for recovering metals from resins |
| US8252254B2 (en) | 2006-06-15 | 2012-08-28 | Barrick Gold Corporation | Process for reduced alkali consumption in the recovery of silver |
| US20090056501A1 (en) * | 2007-08-29 | 2009-03-05 | Vale Inco Limited | Hydrometallurgical process using resin-neutralized-solution of a heap leaching effluent |
| EA020950B1 (en) | 2007-09-17 | 2015-03-31 | Баррик Гольд Корпорейшн | Method to improve recovery of gold from double refractory gold ores |
| TR201002190T1 (en) * | 2007-09-18 | 2010-08-23 | Barrick Gold Corporation | Process for the recovery of gold and silver from refractory ores |
| US8262770B2 (en) | 2007-09-18 | 2012-09-11 | Barrick Gold Corporation | Process for controlling acid in sulfide pressure oxidation processes |
| WO2009069005A2 (en) * | 2007-11-28 | 2009-06-04 | Barrick Gold Corporation | Microbial pre-treatment of double refractory gold ores |
| DE102007061806A1 (en) * | 2007-12-19 | 2009-06-25 | Mettler-Toledo Ag | Process for the regeneration of amperometric sensors |
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