EP2653590A2 - Electro-recovery of gold and silver from leaching solutions by means of simultaneous cathodic and anodic deposition - Google Patents
Electro-recovery of gold and silver from leaching solutions by means of simultaneous cathodic and anodic deposition Download PDFInfo
- Publication number
- EP2653590A2 EP2653590A2 EP11813915.3A EP11813915A EP2653590A2 EP 2653590 A2 EP2653590 A2 EP 2653590A2 EP 11813915 A EP11813915 A EP 11813915A EP 2653590 A2 EP2653590 A2 EP 2653590A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- silver
- gold
- thiosulfate
- leaching
- recovery
- 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.)
- Withdrawn
Links
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 38
- 239000004332 silver Substances 0.000 title claims abstract description 38
- 239000010931 gold Substances 0.000 title claims abstract description 20
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 19
- 238000002386 leaching Methods 0.000 title claims description 20
- 238000011084 recovery Methods 0.000 title claims description 5
- 230000008021 deposition Effects 0.000 title 1
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 6
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 claims abstract 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 31
- 239000000203 mixture Substances 0.000 claims description 6
- 239000003446 ligand Substances 0.000 claims description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 2
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- 238000011282 treatment Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000004070 electrodeposition Methods 0.000 description 16
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- -1 silver metals Chemical class 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 238000009854 hydrometallurgy Methods 0.000 description 3
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 150000002739 metals Chemical group 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GJLUFTKZCBBYMV-UHFFFAOYSA-N carbamimidoylsulfanyl carbamimidothioate Chemical compound NC(=N)SSC(N)=N GJLUFTKZCBBYMV-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- OYNOOANKSLJSCV-UHFFFAOYSA-N silver;thiourea Chemical compound [Ag].NC(N)=S OYNOOANKSLJSCV-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/22—Electrolytic production, recovery or refining of metals by electrolysis of solutions of metals not provided for in groups C25C1/02 - C25C1/20
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/06—Operating or servicing
- C25C7/08—Separating of deposited metals from the cathode
Definitions
- the present invention is related to the mining industry for treatment of minerals and materials which contain gold and silver. Specifically, it is related to a process to recover gold and silver, from leaching solutions with a simultaneous anodic and cathodic electrodeposition process, after which the poor solution is recycled back to the leaching stage.
- both complexing agents can oxidize at potentials near the reduction potential of silver ( Figures 1 and 2 ).
- the diagrams of both ligands with gold are similar. This originates the formation of a narrow potential region where Ag(I) and Au(I) ions are soluble and because of this, both the leaching as well as the electroseparation conditions should be controlled with precision. This could imply a great disadvantage with respect to other systems and has motivated the use of membrane reactors, in order to avoid contact of these solutions with the anode.
- One objective of the present invention is to provide a method to separate gold and silver from thiosulfate or thiourea solutions by simultaneous anodic and cathodic electrodeposition, increasing in this manner the velocity of the process. Another is to accomplish this with a minimum affectation of the solution composition, so that it may be recirculated back to the leaching stage. Yet another is to promote efficient energy use.
- the present invention is intended to solve the problem of gold ans silver separation from thiosulfate and thiourea leaching solutions, providing an improvement over the traditional electro-chemical reactors now in use.
- This improvement is characterizes by a novel process to simultaneously deposit metals in on the anode and cathode in a one compartment reactor, using a commercial copper sheet as the anode and a titanium sheet as the cathode.
- the electrodeposition is performed in a recirculation scheme, illustrated in Figure 4 , in which the solution is charged to the reservoir (320) from which it is pumped (330) to the electrochemical reactor (310) and then returned by gravity to the reservoir.
- the first stage is gold and silver leaching from the mineral or concentrate, using a thiosulfate solution, in this case, whose composition is presented in Table 1.
- the pH was adjusted to 10.0 with NH 4 OH.
- Table 1 Composition of the leaching solution
- the solutions were prepared with reagent grade chemicals using deionized water (1x10 10 M ⁇ cm -1 ). 500 mL of this solution was placed in contact with 3.75 g of a flotation concentrate, with a particle size less than 10 ⁇ m, containing 21 kg/ton of silver. After six hours in continuous agitation, the solution was separated from the solid by filtration and placed in a reactor such as that represented in Figures 4 and 5 .
- Figure 6 shows a graphic representation of the silver concentration with respect to the leaching time. A maximum value was attained in 120 minutes, after which time the concentration remained relatively constant.
- the solution was recycled back to the leaching stage, where it was contacted with fresh unleached concentrate, under the same conditions as described previously. The entire procedure was repeated until three full cycles were completed.
- Figure 8 shows a graphic representation of the leaching results for all three cycles; an increase in the leaching velocity and the maximum silver concentration may be observed in the second and third leach, relative to the first, possibly due to the stabilization of the equilibria between the thiosulfate and the Cu(II) and Cu(I) ions.
- the second and third electrolyses show similar tendencies to that of the first (solid line), only differentiable by the initial value, which depends on the previous leaching stage. In all three cases, the values reached below 10 mg/L in approximately 4 hours.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MX2010013717A MX2010013717A (es) | 2010-12-13 | 2010-12-13 | Electrorecuperacion de oro y plata a partir de soluciones lixiviantes mediante deposito catodico y anodico simultaneo. |
| PCT/MX2011/000151 WO2012081952A2 (es) | 2010-12-13 | 2011-12-09 | Electrorecuperación de oro y plata a partir de soluciones lixiviantes mediante depósito catódico y anódico simultáneo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2653590A2 true EP2653590A2 (en) | 2013-10-23 |
Family
ID=45558362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11813915.3A Withdrawn EP2653590A2 (en) | 2010-12-13 | 2011-12-09 | Electro-recovery of gold and silver from leaching solutions by means of simultaneous cathodic and anodic deposition |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20140076735A1 (zh) |
| EP (1) | EP2653590A2 (zh) |
| JP (1) | JP2014505788A (zh) |
| CN (1) | CN103380234A (zh) |
| AU (1) | AU2011341844A1 (zh) |
| BR (1) | BR112013014874A2 (zh) |
| CA (1) | CA2821421A1 (zh) |
| CO (1) | CO6801793A2 (zh) |
| MX (1) | MX2010013717A (zh) |
| PE (1) | PE20140494A1 (zh) |
| RU (1) | RU2013132451A (zh) |
| WO (1) | WO2012081952A2 (zh) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10331275B2 (en) * | 2014-07-31 | 2019-06-25 | Hewlett-Packard Development Company, L.P. | Process image according to mat characteristic |
| AU2017371918A1 (en) | 2016-12-08 | 2019-07-04 | Clean Resources PTE. LTD. | Recovery of gold and silver from precious metals-containing solids |
| US10807085B2 (en) * | 2017-11-17 | 2020-10-20 | University Of Massachusetts | Silver recovery as Ag0nanoparticles from ion-exchange regenerant solution |
| CN113621995B (zh) * | 2021-07-16 | 2023-12-26 | 武汉理工大学 | 一种基于电化学联合催化技术回收硫代硫酸盐浸出液中贵金属的方法 |
| CN113652554B (zh) * | 2021-07-16 | 2022-12-27 | 武汉理工大学 | 一种基于电容去离子技术回收溶液中贵金属的方法 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010002235A2 (es) * | 2008-07-02 | 2010-01-07 | Universidad Autónoma Metropolitana | Reactor electroquímico tipo filtro prensa para la recuperación de valores de oro (au) y plata (ag) en forma de polvo |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3616332A (en) * | 1969-12-17 | 1971-10-26 | Texas Instruments Inc | Process for recovering silver from scrap materials and electrolyte composition for use therein |
| US4280884A (en) * | 1980-04-07 | 1981-07-28 | Demco, Inc. | Method and apparatus for recovery of silver employing an electrolytic cell having improved solution movement |
| CN85103707B (zh) * | 1985-05-13 | 1987-05-06 | 华东化工学院 | 从金矿中综合提取金、银 、铜的工艺过程 |
| GB8927964D0 (en) * | 1989-12-11 | 1990-02-14 | Kodak Ltd | Method and apparatus for recovering silver from a photographic fixing solution |
| JP3816241B2 (ja) * | 1998-07-14 | 2006-08-30 | 株式会社大和化成研究所 | 金属を還元析出させるための水溶液 |
| JP2001192878A (ja) * | 2000-01-11 | 2001-07-17 | Yuken Industry Co Ltd | 金属組成物からの貴金属回収法 |
| US8025859B2 (en) * | 2007-05-18 | 2011-09-27 | Cesl Limited | Process for gold and silver recovery from a sulphide concentrate |
| MX2008003602A (es) * | 2008-03-14 | 2009-02-25 | Univ Autonoma Metropolitana | Proceso de lixiviacion y recuperacion de plata y oro con soluciones de tiosulfato amoniacales de cobre. |
-
2010
- 2010-12-13 MX MX2010013717A patent/MX2010013717A/es active IP Right Grant
-
2011
- 2011-12-09 US US13/993,247 patent/US20140076735A1/en not_active Abandoned
- 2011-12-09 RU RU2013132451/02A patent/RU2013132451A/ru not_active Application Discontinuation
- 2011-12-09 CN CN2011800674437A patent/CN103380234A/zh active Pending
- 2011-12-09 PE PE2013001408A patent/PE20140494A1/es not_active Application Discontinuation
- 2011-12-09 JP JP2013544412A patent/JP2014505788A/ja active Pending
- 2011-12-09 EP EP11813915.3A patent/EP2653590A2/en not_active Withdrawn
- 2011-12-09 CA CA2821421A patent/CA2821421A1/en not_active Abandoned
- 2011-12-09 BR BR112013014874A patent/BR112013014874A2/pt not_active IP Right Cessation
- 2011-12-09 AU AU2011341844A patent/AU2011341844A1/en not_active Abandoned
- 2011-12-09 WO PCT/MX2011/000151 patent/WO2012081952A2/es active Application Filing
-
2013
- 2013-07-10 CO CO13164020A patent/CO6801793A2/es not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010002235A2 (es) * | 2008-07-02 | 2010-01-07 | Universidad Autónoma Metropolitana | Reactor electroquímico tipo filtro prensa para la recuperación de valores de oro (au) y plata (ag) en forma de polvo |
| EP2439315A2 (en) * | 2008-07-02 | 2012-04-11 | Universidad Autónoma Metropolitana | Filter-press-type electrochemical reactor for recovering gold (au) and silver (ag) values in powder form |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2012081952A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| MX2010013717A (es) | 2012-06-13 |
| AU2011341844A2 (en) | 2013-10-17 |
| WO2012081952A2 (es) | 2012-06-21 |
| US20140076735A1 (en) | 2014-03-20 |
| CN103380234A (zh) | 2013-10-30 |
| BR112013014874A2 (pt) | 2016-10-18 |
| AU2011341844A1 (en) | 2013-08-01 |
| RU2013132451A (ru) | 2015-01-20 |
| JP2014505788A (ja) | 2014-03-06 |
| PE20140494A1 (es) | 2014-04-30 |
| CO6801793A2 (es) | 2013-11-29 |
| WO2012081952A4 (es) | 2013-01-24 |
| CA2821421A1 (en) | 2012-06-21 |
| WO2012081952A3 (es) | 2012-12-06 |
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