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 PDF

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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
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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Withdrawn
Application number
EP11813915.3A
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German (de)
English (en)
French (fr)
Inventor
Gretchen Terri Lapidus Lavine
Alejandro Rafael ALONSO GÓMEZ
Ricardo Benavides Perez
Javier Alejandro Silva Alonso
Carlos Lara Valenzuela
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universidad Autonoma Metropolitana (UAM)
Servicios Administrativos Penoles SA de CV
Original Assignee
Universidad Autonoma Metropolitana (UAM)
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Publication date
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Application filed by Universidad Autonoma Metropolitana (UAM) filed Critical Universidad Autonoma Metropolitana (UAM)
Publication of EP2653590A2 publication Critical patent/EP2653590A2/en
Withdrawn legal-status Critical Current

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    • 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP11813915.3A 2010-12-13 2011-12-09 Electro-recovery of gold and silver from leaching solutions by means of simultaneous cathodic and anodic deposition Withdrawn EP2653590A2 (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016018409A1 (en) * 2014-07-31 2016-02-04 Hewlett-Packard Development Company, L.P. Process image according to mat characteristic
WO2018104803A1 (en) * 2016-12-08 2018-06-14 Metoxs 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
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
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

Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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.

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Title
See also references of WO2012081952A2 *

Also Published As

Publication number Publication date
PE20140494A1 (es) 2014-04-30
AU2011341844A1 (en) 2013-08-01
MX2010013717A (es) 2012-06-13
CN103380234A (zh) 2013-10-30
JP2014505788A (ja) 2014-03-06
BR112013014874A2 (pt) 2016-10-18
AU2011341844A2 (en) 2013-10-17
WO2012081952A3 (es) 2012-12-06
CA2821421A1 (en) 2012-06-21
WO2012081952A2 (es) 2012-06-21
US20140076735A1 (en) 2014-03-20
WO2012081952A4 (es) 2013-01-24
CO6801793A2 (es) 2013-11-29
RU2013132451A (ru) 2015-01-20

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