CA2449467A1 - Method for thiosulfate leaching of precious metal-containing materials - Google Patents
Method for thiosulfate leaching of precious metal-containing materials Download PDFInfo
- Publication number
- CA2449467A1 CA2449467A1 CA 2449467 CA2449467A CA2449467A1 CA 2449467 A1 CA2449467 A1 CA 2449467A1 CA 2449467 CA2449467 CA 2449467 CA 2449467 A CA2449467 A CA 2449467A CA 2449467 A1 CA2449467 A1 CA 2449467A1
- Authority
- CA
- Canada
- Prior art keywords
- metal
- precious metal
- containing material
- calcium
- 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
- 238000000034 method Methods 0.000 title claims abstract 38
- 239000010970 precious metal Substances 0.000 title claims abstract 31
- 238000002386 leaching Methods 0.000 title claims abstract 3
- 239000000463 material Substances 0.000 title claims 25
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 title abstract 2
- 239000003795 chemical substances by application Substances 0.000 claims abstract 7
- 239000002184 metal Chemical class 0.000 claims 18
- 229910052751 metal Chemical class 0.000 claims 18
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 claims 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 10
- 239000011575 calcium Substances 0.000 claims 10
- 229910052791 calcium Inorganic materials 0.000 claims 10
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims 7
- 229910001882 dioxygen Inorganic materials 0.000 claims 7
- 239000002244 precipitate Substances 0.000 claims 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 4
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims 4
- 239000007790 solid phase Substances 0.000 claims 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 3
- 239000003153 chemical reaction reagent Substances 0.000 claims 3
- 229910052802 copper Inorganic materials 0.000 claims 3
- 239000010949 copper Substances 0.000 claims 3
- 239000007791 liquid phase Substances 0.000 claims 3
- 239000000047 product Substances 0.000 claims 3
- 239000002002 slurry Substances 0.000 claims 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims 2
- 239000002253 acid Substances 0.000 claims 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 2
- 239000001110 calcium chloride Substances 0.000 claims 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims 2
- 239000000920 calcium hydroxide Substances 0.000 claims 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims 2
- 239000000292 calcium oxide Substances 0.000 claims 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims 2
- FAYYUXPSKDFLEC-UHFFFAOYSA-L calcium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [Ca+2].[O-]S([O-])(=O)=S FAYYUXPSKDFLEC-UHFFFAOYSA-L 0.000 claims 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 2
- 239000011707 mineral Substances 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000002245 particle Substances 0.000 claims 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims 2
- LDMOEFOXLIZJOW-UHFFFAOYSA-N 1-dodecanesulfonic acid Chemical class CCCCCCCCCCCCS(O)(=O)=O LDMOEFOXLIZJOW-UHFFFAOYSA-N 0.000 claims 1
- 229920002907 Guar gum Chemical class 0.000 claims 1
- 229910019142 PO4 Inorganic materials 0.000 claims 1
- 229920002472 Starch Chemical class 0.000 claims 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims 1
- 150000001298 alcohols Chemical class 0.000 claims 1
- 150000001299 aldehydes Chemical class 0.000 claims 1
- 229910021529 ammonia Inorganic materials 0.000 claims 1
- 239000010953 base metal Substances 0.000 claims 1
- 239000001913 cellulose Chemical class 0.000 claims 1
- 229920002678 cellulose Chemical class 0.000 claims 1
- 235000010980 cellulose Nutrition 0.000 claims 1
- 239000004568 cement Substances 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 239000000665 guar gum Chemical class 0.000 claims 1
- 229960002154 guar gum Drugs 0.000 claims 1
- 235000010417 guar gum Nutrition 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 claims 1
- 150000002430 hydrocarbons Chemical class 0.000 claims 1
- 229910052976 metal sulfide Inorganic materials 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- 239000007800 oxidant agent Substances 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 235000021317 phosphate Nutrition 0.000 claims 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 238000004064 recycling Methods 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 239000008107 starch Chemical class 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000004094 surface-active agent Chemical class 0.000 claims 1
- 239000011819 refractory material Substances 0.000 abstract 1
Classifications
-
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ leap leaching or lixiviants that include one or more blinding agents.
Claims (36)
1. A process for recovering a precious metal from a precious metal-containing material, comprising:
(a) providing a heap of the precious metal-containing material; and (b) passing a thiosulfate lixiviant and molecular oxygen through the heap to form a pregnant leach solution comprising dissolved precious metals, wherein the molecular oxygen is at a pressure greater than its ambient atmospheric pressure before introduction into the heap.
(a) providing a heap of the precious metal-containing material; and (b) passing a thiosulfate lixiviant and molecular oxygen through the heap to form a pregnant leach solution comprising dissolved precious metals, wherein the molecular oxygen is at a pressure greater than its ambient atmospheric pressure before introduction into the heap.
2. The process of claim 1, wherein the molecular oxygen is in the form of a gas and the thiosulfate lixiviant and molecular oxygen flow countercurrently through the heap.
3. The process of claim 1, wherein the molecular oxygen is introduced under pressure into the heap by a network of conduits positioned in the base of the heap.
4. The process of claim 1, wherein the thiosulfate lixiviant has a pH of no more than about 9 before introduction to the heap and wherein the precious metal-containing material is agglomerated.
5. The process of claim 1, wherein the thiosulfate lixiviant has a free ammonia content of no more than about 2,000 ppm and a dissolved copper content of no more than about 20 mg/L.
6. The process of claim 1, wherein at least about 0.5 kg of molecular oxygen/ton of heap material is introduced into the heap during leaching.
7. The process of claim 1, wherein a dissolved molecular oxygen content of the lixiviant is at least about 1 mg/L.
8. A precious metal recovered by the process of claim 1.
9. A process for recovering a precious metal from a carbonaceous precious metal-containing material, comprising:
(a) providing a refractory, carbonaceous precious metal-containing material;
and (b) contacting the carbonaceous precious metal-containing material with a thiosulfate-containing lixiviant, wherein the lixiviant contains a blinding agent.
(a) providing a refractory, carbonaceous precious metal-containing material;
and (b) contacting the carbonaceous precious metal-containing material with a thiosulfate-containing lixiviant, wherein the lixiviant contains a blinding agent.
10. The process of claim 9, wherein the blinding agent includes one or more of hydrocarbons, alcohols, esters, aldehydes, surfactants, lauryl sulfonates, phosphates;
guar gum, starch, cellulose, and metal salts.
guar gum, starch, cellulose, and metal salts.
11. The process of claim 9, wherein the thiosulfate lixiviant includes at least about 0.1 mg/L blinding agent.
12. The process of claim 9, wherein the thiosulfate lixiviant includes at least about 1 mg/L blinding agent.
13. The process of claim 9, wherein the thiosulfate lixiviant includes from about 2 to about 200 mg/L blinding agent.
14. A precious metal recovered by the process of claim 9.
15. A process for recovering a precious metal from a precious metal-containing material, comprising:
(a) providing a particulate precious metal-containing material;
(b) contacting the precious metal-containing material with a thiosulfate lixiviant and a calcium-containing material;
(c) after the contacting step, forming the precious metal-containing material into agglomerates, wherein the agglomerates comprise particles of the precious metal-containing material, thiosulfate lixiviant, and calcium-containing material;
(d) forming the agglomerates into a heap; and (e) thereafter passing the thiosulfate lixiviant through the heap to form a pregnant leach solution in which at least most of the precious metal content of the precious metal-containing material is dissolved.
(a) providing a particulate precious metal-containing material;
(b) contacting the precious metal-containing material with a thiosulfate lixiviant and a calcium-containing material;
(c) after the contacting step, forming the precious metal-containing material into agglomerates, wherein the agglomerates comprise particles of the precious metal-containing material, thiosulfate lixiviant, and calcium-containing material;
(d) forming the agglomerates into a heap; and (e) thereafter passing the thiosulfate lixiviant through the heap to form a pregnant leach solution in which at least most of the precious metal content of the precious metal-containing material is dissolved.
16. The process of claim 15, wherein the calcium-containing material is a base.
17. The process of claim 15, wherein the calcium-containing material is at least one of calcium carbonate, calcium oxide, calcium chloride, calcium nitrate, calcium thiosulfate, calcium hydroxide, and mixtures thereof.
18. The process of claim 15, wherein the agglomerates further comprise copper.
19. The process of claim 15, wherein the agglomerates further comprise a base other than the calcium-containing material.
20. The process of claim 15, wherein the calcium content of the agglomerates is at least about 0.1 kg/tonne of agglomerates.
21. The process of claim 18, wherein the agglomerates comprise at least about 1 gram/tonne of added copper.
22. The process of claim 15, wherein the agglomerates comprise at least one of particles of cement and a blinding agent.
23. A precious metal recovered by the process of claim 15.
24. A process for recovering a precious metal from a precious metal-containing material, comprising:
(a) contacting a thiosulfate lixiviant with a precious metal-containing material to form a pregnant leach solution, the pregnant leach solution comprising a dissolved precious metal, thiosulfate, polythionate, and sulfate; and (b) maintaining a dissolved sulfate concentration in the pregnant leach solution of no more than about 150 g/L.
(a) contacting a thiosulfate lixiviant with a precious metal-containing material to form a pregnant leach solution, the pregnant leach solution comprising a dissolved precious metal, thiosulfate, polythionate, and sulfate; and (b) maintaining a dissolved sulfate concentration in the pregnant leach solution of no more than about 150 g/L.
25. The pmcess of claim 24, wherein the maintaining step comprises:
(c) precipitating sulfates with calcium.
(c) precipitating sulfates with calcium.
26. The process of claim 24, wherein the maintaining step comprises:
(c) removing sulfates from at least a portion of the pregnant leach solution and/or a solution derived therefrom.
(c) removing sulfates from at least a portion of the pregnant leach solution and/or a solution derived therefrom.
27. The process of claim 25, wherein the calcium is selected from the group consisting essentially of calcium carbonate, calcium oxide, calcium chloride, calcium nitrate, calcium thiosulfate, calcium hydroxide, and mixtures thereof.
28. The process of claim 25, further comprising:
(d) contacting the calcium with the pregnant leach solution and/or a solution derived therefrom, and wherein the amount of calcium is at least about 0.1 kg/tonne of precious metal-containing material.
(d) contacting the calcium with the pregnant leach solution and/or a solution derived therefrom, and wherein the amount of calcium is at least about 0.1 kg/tonne of precious metal-containing material.
29. A precious metal recovered by the process of claim 24.
30. A process for recovering a precious metal from a metal-containing material, comprising:
(a) contacting a metal-containing material with thiosulfate to form a pregnant leach solution comprising thiosulfate and at least a portion of the metal in the metal-containing material;
(b) contacting the pregnant leach solution and/or a solution derived therefrom with a sulfide reagent to form a precipitate-containing slurry comprising the metal sulfide precipitates and elemental sulfur; and (c) contacting at least one of the precipitate-containing slurry and the metal precipitates with a sulfite reagent to convert at least most of the elemental sulfur into thiosulfate.
(a) contacting a metal-containing material with thiosulfate to form a pregnant leach solution comprising thiosulfate and at least a portion of the metal in the metal-containing material;
(b) contacting the pregnant leach solution and/or a solution derived therefrom with a sulfide reagent to form a precipitate-containing slurry comprising the metal sulfide precipitates and elemental sulfur; and (c) contacting at least one of the precipitate-containing slurry and the metal precipitates with a sulfite reagent to convert at least most of the elemental sulfur into thiosulfate.
31. The process of claim 29, further comprising, before step (c):
{d) separating the metal precipitates from the precipitate-containing slurry and wherein the metal precipitates are contacted with the sulfite reagent.
{d) separating the metal precipitates from the precipitate-containing slurry and wherein the metal precipitates are contacted with the sulfite reagent.
32. The process of claim 29, wherein the metal is a precious metal and further comprising:
(d) separating a liquid phase of the product of step (c) from a solid phase thereof, wherein the liquid phase comprises at least most of the thiosulfate in the product and the solid phase comprises at least most of the metal in the product.
(d) separating a liquid phase of the product of step (c) from a solid phase thereof, wherein the liquid phase comprises at least most of the thiosulfate in the product and the solid phase comprises at least most of the metal in the product.
33. The process of claim 31, further comprising:
(e) recycling the liquid phase to the contacting step (a).
(e) recycling the liquid phase to the contacting step (a).
34. The process of claim 31, wherein the solid phase comprises first and second metals and further comprising:
(e) contacting the solid phase with at least one of a mineral acid and an oxidant other than the mineral acid to precipitate the first metal but not the second metal;
and separating the precipitated first metal from the dissolved second metal.
(e) contacting the solid phase with at least one of a mineral acid and an oxidant other than the mineral acid to precipitate the first metal but not the second metal;
and separating the precipitated first metal from the dissolved second metal.
35. The process of claim 33, wherein the first metal is a base metal and the second metal is a precious metal.
36. A metal recovered by the process of claim 29.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2691607A CA2691607C (en) | 2002-11-15 | 2003-11-14 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2449467A CA2449467C (en) | 2002-11-15 | 2003-11-14 | Method for thiosulfate leaching of precious metal-containing materials |
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42634302P | 2002-11-15 | 2002-11-15 | |
| US60/426343 | 2002-11-18 | ||
| CA2,412,352 | 2002-11-21 | ||
| CA002412352A CA2412352A1 (en) | 2002-11-18 | 2002-11-21 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2,424,714 | 2003-04-01 | ||
| CA2424714A CA2424714C (en) | 2002-11-15 | 2003-04-01 | Method for thiosulfate leaching of precious metal-containing materials |
| USUNKNOWN | 2003-08-20 | ||
| US10/713,640 US7722840B2 (en) | 2002-11-15 | 2003-11-13 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2449467A CA2449467C (en) | 2002-11-15 | 2003-11-14 | Method for thiosulfate leaching of precious metal-containing materials |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2691607A Division CA2691607C (en) | 2002-11-15 | 2003-11-14 | Method for thiosulfate leaching of precious metal-containing materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2449467A1 true CA2449467A1 (en) | 2004-05-15 |
| CA2449467C CA2449467C (en) | 2010-03-23 |
Family
ID=32511832
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2424714A Expired - Lifetime CA2424714C (en) | 2002-11-15 | 2003-04-01 | Method for thiosulfate leaching of precious metal-containing materials |
| CA2449467A Expired - Lifetime CA2449467C (en) | 2002-11-15 | 2003-11-14 | Method for thiosulfate leaching of precious metal-containing materials |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2424714A Expired - Lifetime CA2424714C (en) | 2002-11-15 | 2003-04-01 | Method for thiosulfate leaching of precious metal-containing materials |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2424714C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119566A (en) * | 2016-08-18 | 2016-11-16 | 紫金矿业集团股份有限公司 | A kind of hot pressing recovery method of the difficult gold mine of arsenic-containing sulphur-containing |
| US10597752B2 (en) | 2013-05-29 | 2020-03-24 | Barrick Gold Corporation | Method for pre-treatment of gold-bearing oxide ores |
| CN112863611A (en) * | 2021-01-14 | 2021-05-28 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for determining iron salt dosage extreme value in cyanide-containing wastewater treatment by iron salt precipitation method |
| US11639540B2 (en) | 2019-01-21 | 2023-05-02 | Barrick Gold Corporation | Method for carbon-catalysed thiosulfate leaching of gold-bearing materials |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2021203211B2 (en) * | 2020-05-22 | 2022-04-07 | Anglo American Technical & Sustainability Services Ltd | Heap Leaching |
-
2003
- 2003-04-01 CA CA2424714A patent/CA2424714C/en not_active Expired - Lifetime
- 2003-11-14 CA CA2449467A patent/CA2449467C/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10597752B2 (en) | 2013-05-29 | 2020-03-24 | Barrick Gold Corporation | Method for pre-treatment of gold-bearing oxide ores |
| US11401580B2 (en) | 2013-05-29 | 2022-08-02 | Barrick Gold Corporation | Method for pre-treatment of gold-bearing oxide ores |
| CN106119566A (en) * | 2016-08-18 | 2016-11-16 | 紫金矿业集团股份有限公司 | A kind of hot pressing recovery method of the difficult gold mine of arsenic-containing sulphur-containing |
| US11639540B2 (en) | 2019-01-21 | 2023-05-02 | Barrick Gold Corporation | Method for carbon-catalysed thiosulfate leaching of gold-bearing materials |
| CN112863611A (en) * | 2021-01-14 | 2021-05-28 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for determining iron salt dosage extreme value in cyanide-containing wastewater treatment by iron salt precipitation method |
| CN112863611B (en) * | 2021-01-14 | 2022-03-08 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for determining iron salt dosage extreme value in cyanide-containing wastewater treatment by iron salt precipitation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2449467C (en) | 2010-03-23 |
| CA2424714A1 (en) | 2004-05-18 |
| CA2424714C (en) | 2011-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20231114 |