EP3155135A1 - Procédé permettant d'extraire de l'or et de l'argent à partir de minerais et de sous-produits d'exploitation minière - Google Patents

Procédé permettant d'extraire de l'or et de l'argent à partir de minerais et de sous-produits d'exploitation minière

Info

Publication number
EP3155135A1
EP3155135A1 EP15749894.0A EP15749894A EP3155135A1 EP 3155135 A1 EP3155135 A1 EP 3155135A1 EP 15749894 A EP15749894 A EP 15749894A EP 3155135 A1 EP3155135 A1 EP 3155135A1
Authority
EP
European Patent Office
Prior art keywords
ppm
gold
silver
mining
temperature
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.)
Pending
Application number
EP15749894.0A
Other languages
German (de)
English (en)
Inventor
Jack Goldstein
Liana Rozica OSANU
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP3155135A1 publication Critical patent/EP3155135A1/fr
Pending legal-status Critical Current

Links

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
    • C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
    • C22B3/14—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions containing ammonia or ammonium salts
    • 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
    • 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
    • C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of 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
    • C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
    • 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

Definitions

  • the invention relates to a process for the extraction of gold and silver from ores or mining by-products consisting of pyrite concentrates, flotation tailings and metallurgical slags, chemically, using as reagent a solution of ammonium thiosulphate in an alkaline medium and a catalyst consisting of an amine of copper, provided the reagents are recirculated in the leaching process.
  • Processes are known for the preparation of gold and silver by solubi!izing ores and pyrite concentrates in sodium thiosulphate solution, after having been oxidized in advance, in an autoclave under a pressure of oxygen, in an acid or alkaline environment, by oxidation reactions with chlorine or chlorites, by direct dissolution of the sodium thiosulphate solution in the presence of copper or nickel.
  • the extraction of the gold and silver solubilized in thiosulphate solution is carried out by adsorption on ion exchange or adsorption on active carbon, electrochemically, by cementation on copper, zinc and aluminum, by precipitation with sodium sulphide.
  • the ore containing 6 ppm Au is oxidized in an alkaline medium, under a pressure of oxygen, at 2 I O-220°C.
  • the solubilization of gold in ores is carried out with a solution of 0,1m ammonium thiosulfate and 0.5g/l Cu 2+ , and extraction of metals gold, silver and copper from the solution is carried out by absorption on ion exchange resins - IRA 93, IRA 400.
  • the concentration of gold in the resin may increase to 9 kg/t resin.
  • the cement of copper, gold and silver separated to cathode is filtered separately and subjected to a leaching in sulphuric acid.
  • the solution with 50- 60g/l Na 2 S 2 0 3 - 5 H 2 0 is adjusted to 3-4g/l Cu and recycled in the ore leaching process.
  • the gold and silver cement is melted in an alkaline-reducing medium to 1 ,200°C, obtaining the Au - Ag alloy.
  • the yield of the process is 78-82% for gold and 76-8 1 % for silver, provided the content of noble metals in the ore.
  • the technical problem solved by the invention as claimed is to recover gold and silver from ores, by-products and mining tailings with low noble metals content (less than 0.5 ppm Au), in terms of use of non-toxic reagents in a relatively low concentration, namely all reagents recirculation.
  • the present invention solves the technical problem by the fact that, removing the aforegoing disadvantages, and allowing to obtain gold and silver from ores and mining residues with a content of at least 0.5 ppm Au, presents the following technological steps:
  • the process has applicability into obtain gold and silver from poor ores, refractory pyrite concentrates and metallurgical tailings with contents up to 0.5 ppm Au, ensuring the recycling of all reagents during the raw material leaching process.
  • the process according to the invention consists in treating the raw material with a minimum of 0.5 ppm under stirring with a solution resulted from the electrolytic separation of gold, silver and copper, which contains 10 to 25g/l (NH 4 ) 2 S 2 0 3 ; 0.1 to I .Og/l Cu; 0.3 - 0.4g/l N H4OH ; 5- 15 ppm Au and 1 - 100 ppm Ag, at a solid iquid ratio of 1 : 1 ... 1 : 1 .5 under stirring and air bubbling for 2 to 4 hours at a temperature of 1 5-25°C.
  • the resulting suspension is filtered and the residue is washed with water and becomes raw material, when contains common metals or becomes construction fi ller material, when the basic component is a si licate.
  • the fi ltered solution both with washing water is subjected to an electrochemical extraction with insoluble anodes, the electric current density being of 200-250 A/m2, when is formed a copper cement containing 1 ... 5% Au and 1 ... 20% Ag.
  • the circulation speed of the electrolyte is set such that the output from the electrolysis cell contains: 10-25g/l (NH 4 )2S 2 0 3 ; 5- 1 5 ppm Au; 1 - 100 ppm Ag and 0. 1 to l .Og/1 Cu. This solution, after correcting the content of copper to 0.
  • the copper cement containing gold and silver is solubilized with ammoniacal water to a concentration of 20% NH 3 at a solid:liquid ratio of 1 :5 - 1 : 10 under stirring, at a temperature of 1 5-25° C, for 3-5 hours.
  • the suspension is filtered and the copper tetrammine filtrate is recycled to the leaching operation of the raw material, in order to correct the copper content and the pH.
  • the residue resulting after washing and drying at a temperature of 105°C is melted in a alkaline-reducing medium, to obtain the Au-Ag alloy - the dore alloy. Separation of gold and silver from the dore alloy is achieved by electrochemical refining, obtaining give gold and silver with a purity of 99.9%.
  • Example 1 In a reactor made of alloy steel or enamelled cast iron with a capacity of 2m 3 , equipped with a stirring system, are introduced 1 .5 m 3 of solution from the alkaline electrolysis operation, comprising: 10 to 25 g/l (NH 4 ) 2 S 2 0 ; 1 3 - 1 5 ppm Au; 50-60 ppm Ag; 0. 1 to 0. 12 g/l Cu, adjusted to 0. 12 - 0.
  • the slurry resulting after filtering - a quartz residue - is washed with 100- 1 50 litres of water, is free of impurities, has a moisture content of 8- 10% and can be used as a construction filler material.
  • the fi ltered solution with a volume of 1.5 - 1.6 m 3 which contains 10 to 25 g/l (NH 4 )2S 2 0 3 , 1 3.2 - 15.5 ppm Au, 5 1 -65 ppm Ag and 0. 12 to 0. 1 5 g/1 Cu (pH 10 - 1 1 ) is subjected to electrolysis with anodes made of high-alloy steel, the electric current density of 200-250 Aim 2 .
  • the electrolytical cell having a capacity of 2 m 3 , is equipped with two electrodes of equal surfaces of 1 m 2 .
  • the electrolyte is internally recycled at a rate of 2 m 3 /h.
  • the operation takes about 2 hours and is considered finished when the electrolyte that leaves the cell contains 13.0 to 15.0 ppm Au, 50-60 ppm Ag and 0. 10 to 0.12 g/l Cu.
  • the cementum separated in the conical part of the cell in an amount of 1.0 - 1 .5 kg, with a content of 0.9 to 1 .0% Au, 17- 19% Ag and 35 - 45% Cu, is filtered and washed with water.
  • the leaching of the copper cementum in the filtrate is carried out in a reactor made of enamelled iron of 100 litres, ammonia water having a concentration of 20% NH 3 at a solid:liquid ratio of 1 :3 ... 1 :5, under stirring, with the absorption of ammonia removed from the reactor into a tower with packing, sprayed with water.
  • the operation takes 3-5 hours.
  • the suspension is filtered on a nuce filter under vacuum.
  • Decoppered cement, after washing with water, with a content of maximum 5% Cu, 3 - 3.5% Au and 50 - 60% Ag is dried, mixed with sodium carbonate and carbon at a ratio of 1 :3:0.5 is melted in a graphite crucible, at a temperature of 1200° C.
  • the Au-Ag alloy - the dore alloy - is cast into anodes and subjected to known-per-se operations of electrochemical and thermal refining, in order to obtain pure gold and silver.
  • the slag obtained by smelting cementum is ground and recycled to the leaching operation of the raw material.
  • the overall yield of the operation ore - metal is 70% to 86% for Au and Ag.
  • Example 2 Under similar operations as in Example 1 , with the difference that the raw material is a pyrite concentrate refractive to the dissolution in an alkaline cyanide solution, containing 12 ppm Au, 50 ppm Ag, and after dissolving results a pyrite with 0.95 ppm Au and 2.5 ppm Ag.
  • the overall yield of the operation pyrite concentrates - metal is 86.2% to 89.7% for Au and Ag.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé permettant l'extraction de l'or et de l'argent à partir de minerais et de sous-produits d'exploitation minière. Le procédé selon l'invention consiste à traiter des minerais et des résidus d'exploitation minière présentant une teneur en or (Au) de 0,5 à 12 ppm avec une solution de thiosulfate d'ammonium, recyclé à une température comprise entre 15 et 25 °C; le filtrat obtenu après la solubilisation est soumis à une extraction électrolytique avec des électrodes en alliage noble avec une densité de courant comprise entre 200 et 250 A/m2, jusqu'à ce que l'électrolyte atteigne une concentration en or (Au) comprise entre 5 et 15 ppm, une concentration en argent (Ag) comprise entre 1 et 100 ppm et une concentration en cuivre (Cu) comprise entre 0,1 et 1,0 g/l; ensuite, le ciment séparé est filtré et dissous dans de l'ammoniac aqueux, séché à une température de 105 °C et fondu à une température de 1 200 °C, ce qui permet d'obtenir un alliage Au-Ag, qui est traité par les opérations de raffinage électrochimique et thermique, à partir desquelles on obtient de l'or et de l'argent de pureté élevée.
EP15749894.0A 2014-04-30 2015-04-24 Procédé permettant d'extraire de l'or et de l'argent à partir de minerais et de sous-produits d'exploitation minière Pending EP3155135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ROA201400335A RO129874B1 (ro) 2014-04-30 2014-04-30 Procedeu de extragere a aurului şi argintului din minereuri şi subproduse miniere cu conţinut scăzut de aur
PCT/RO2015/000008 WO2015171010A1 (fr) 2014-04-30 2015-04-24 Procédé permettant d'extraire de l'or et de l'argent à partir de minerais et de sous-produits d'exploitation minière

Publications (1)

Publication Number Publication Date
EP3155135A1 true EP3155135A1 (fr) 2017-04-19

Family

ID=51945587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15749894.0A Pending EP3155135A1 (fr) 2014-04-30 2015-04-24 Procédé permettant d'extraire de l'or et de l'argent à partir de minerais et de sous-produits d'exploitation minière

Country Status (5)

Country Link
US (1) US20170044644A1 (fr)
EP (1) EP3155135A1 (fr)
CA (1) CA2947480A1 (fr)
RO (1) RO129874B1 (fr)
WO (1) WO2015171010A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU102054B1 (de) * 2020-07-27 2022-01-27 Centuro Ag Verfahren zur Gewinnung von Gold und Silber aus Rohstoffen
WO2022022987A1 (fr) * 2020-07-27 2022-02-03 Centuro Ag Procédé d'obtention d'or et d'argent à partir de matières premières
WO2022040334A1 (fr) * 2020-08-18 2022-02-24 Enviro Metals, LLC Affinage de métaux

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369061A (en) * 1979-12-28 1983-01-18 Kerley Jr Bernard J Recovery of precious metals from difficult ores
US20030154822A1 (en) * 1999-12-09 2003-08-21 John Hall Recovery of precious metals
US7722840B2 (en) * 2002-11-15 2010-05-25 Placer Dome Technical Services Limited Method for thiosulfate leaching of precious metal-containing materials
RO126480B1 (ro) * 2011-03-09 2012-11-29 Viorel-Alexandru Măluşel Procedeu de obţinere a aurului şi argintului
CN102676822B (zh) * 2011-03-11 2014-01-01 深圳市格林美高新技术股份有限公司 一种免焚烧无氰化处理废旧印刷电路板的方法
CN102943180B (zh) * 2012-07-20 2014-07-02 北京科技大学 一种铜阳极泥分银渣金银回收的方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015171010A1 *

Also Published As

Publication number Publication date
US20170044644A1 (en) 2017-02-16
CA2947480A1 (fr) 2015-11-12
RO129874A0 (ro) 2014-11-28
RO129874B1 (ro) 2018-05-30
WO2015171010A1 (fr) 2015-11-12

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