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WO2011150984A1 - Procédé de récupération de métaux nobles et d'autres sous-produits à partir d'un minerai - Google Patents

Procédé de récupération de métaux nobles et d'autres sous-produits à partir d'un minerai Download PDF

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Publication number
WO2011150984A1
WO2011150984A1 PCT/EP2010/064678 EP2010064678W WO2011150984A1 WO 2011150984 A1 WO2011150984 A1 WO 2011150984A1 EP 2010064678 W EP2010064678 W EP 2010064678W WO 2011150984 A1 WO2011150984 A1 WO 2011150984A1
Authority
WO
WIPO (PCT)
Prior art keywords
ore
ore particles
electrolytic bath
bath
noble metals
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.)
Ceased
Application number
PCT/EP2010/064678
Other languages
English (en)
Inventor
Voldemars Belakovs
Nicolae Costache
Dimitru Crestin
Geanina Silviana Banu
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
Priority to CN2010800676122A priority Critical patent/CN102947472A/zh
Priority to AU2010354435A priority patent/AU2010354435A1/en
Priority to CA2800694A priority patent/CA2800694A1/fr
Priority to US13/701,245 priority patent/US20130146477A1/en
Priority to EP10760350.8A priority patent/EP2576850B1/fr
Priority to EA201291166A priority patent/EA201291166A1/ru
Publication of WO2011150984A1 publication Critical patent/WO2011150984A1/fr
Priority to ZA2012/08874A priority patent/ZA201208874B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • 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

Definitions

  • the present invention relates to a method for recovering noble metals and other byproducts from ore.
  • the present invention relates in particular to a method for recovering noble metals and other byproducts by disintegration of ore using nontoxic processes.
  • Electrochemistry - has a high recovery rate of up to 98% but is a slow
  • An aim of the present invention is thus to propose an industrially applicable method for recovering noble metals and other byproducts from ore allowing for a high recovery rate.
  • Another aim of the present invention is to propose an industrially applicable and economical method for recovering noble metals and other byproducts from ore
  • Still another aim of the present invention is to propose an industrially applicable method for recovering noble metals and other byproducts from ore that doesn't use nor produce any toxic substance.
  • a method for the recovery of noble metals comprising the steps of subjecting ore particles to an electrolytic bath enhanced by an ultrasonic bath, the electrolytic bath comprising heavy and/or semi-heavy water; shock heating the ore particles for disintegrating them; and separating noble metals from the remains of said disintegrated ore particles.
  • the method of the invention for recovering noble metals and other byproducts from ore is economical applicable at an industrial scale. Experiments have shown that it has a typical recovery rate of 95 to 99.9%. No toxic substance is used or produced during any step of the method.
  • Fig. 1 schematically illustrates an electrolytic bath placed inside an ultrasonic bath for performing a step of the method according to a preferred embodiment of the invention
  • Fig. 2 schematically illustrates a crucible placed in a microwave oven for performing another step of the method according to a preferred embodiment of the invention
  • Fig. 3 schematically illustrates a cone shaped container placed in an ultrasonic bath for performing still another step of the method according to a preferred embodiment of the invention.
  • the method of the invention for the recovery of noble metals and other byproducts from ore preferably comprises the following steps:
  • the ore is prepared for the following steps of the method, which includes crushing the ore to particles of a target mean size; the preliminary step uses for example commonly known mechanical techniques for crushing the ore;
  • the crushed ore is placed in an electrolytic bath that is placed in an ultrasonic bath; as explained below, the substances necessary for performing the next step of the method are produced by the electrolytic bath and penetrate into the macro and micro pores of the ore with the help of the ultrasonic bath;
  • the ore is disintegrated using shock heating, preferably microwave shock heating;
  • the noble metals are then recovered from the disintegrated ore, using preferably an ultrasonic induced gravity separation process.
  • the method of the invention for recovering noble metals and other byproducts from ore is preferably performed on small particles of crushed ore.
  • the ore is thus crushed down to a predetermined target particle size, which participates to an increased efficiency of the next steps of the method of the invention for maximizing the recovery rate achieved with the method of the invention.
  • the target size for the ore particles is preferably smaller than or equal to 590 microns (30 US Mesh), more preferably smaller than or equal to 420 microns (40 US Mesh), even more preferably smaller than or equal to 250 microns (60 US Mesh). Crushing of the ore is performed using any appropriate, preferably mechanical, method.
  • the crushed ore is further centrifuged in order to create micropores and/or cracks or macropores in the ore particles and/or in order to further open micropores and/or cracks or macropores made in the ore particles during crushing.
  • the preferably crushed ore is placed in an electrolytic bath and simultaneously submitted to ultrasounds.
  • the ore particles are placed in two ore containers 30 that are immersed at a distance from each other in an electrolytic bath 1.
  • the external walls of the ore containers 30 are preferably permeable to the ions of the electrolytic bath.
  • the external walls of the containers 30 are made of a microporous nylon membrane.
  • the ore containers 30 are preferably cone shaped for an improved efficiency of the method of the invention. Other shapes are however possible within the frame of the invention.
  • An electrode 3 is located in each ore container 30.
  • the electrodes 3 are electrically connected to a source of electrical power, which is not represented on the figures.
  • the electrodes 3 are for example made of titanium or nickel and preferably have both the same shape and size.
  • the electrodes 3 are preferably metallic rods that are located vertically along the central axis of their respective ore container 30. Other shapes and configurations of the electrodes are however possible within the scope of the invention.
  • Each electrode may for example comprise several branches that are spread within their respective ore container.
  • the electrolytic bath 1 is placed in an ultrasonic bath 2, in which ultrasounds are generated that propagate through the walls of the electrolytic bath container 10 and into the electrolytic bath 1.
  • the temperature of the ultrasonic bath 2 is preferably around eighty degrees Celsius.
  • the composition of the electrolytic bath 1 preferably includes heavy and/or semi- heavy water, such as for example deuterium or tritium.
  • the concentration of heavy and/or semi-heavy water in the electrolytic bath 1 is for example between 2 to 5 percents.
  • the composition of the ultrasonic bath 2 is for example essentially water and/or any liquid in which ultrasounds efficiently propagate.
  • the ultrasounds are preferably generated by one or more ultrasonic transducers located preferably inside the ultrasonic bath container 20, which are not shown on the figures for the sake of readability and conciseness.
  • the electrolytic processing of the ore is initiated by applying direct current (DC) voltage to the electrodes 3, for example six volts DC voltage with a current density of six amperes per square decimeter (A/dm 2 ).
  • DC direct current
  • One of the electrodes 3 becomes the anode, while the other electrode 3 becomes the cathode.
  • the polarity of the DC voltage is inversed at regular intervals in order to submit the ore contained in both ore containers 30 to the same treatment, i.e. to the same polarities for equivalent periods of time.
  • the DC voltage is for example applied to the electrodes 3 for a total of two hours, divided in four cycles of thirty minutes each. After each cycle of thirty minutes, the polarity of the DC voltage is changed, i.e. after each cycle of thirty minutes, the cathode becomes the anode and vice versa.
  • chlorine and other gases and/or soluble salts are produced near the anode, which penetrate the ore particles contained in the corresponding ore container 30. These gases and/or soluble salts will participate to the disintegration of the ore particles in a next step of the method.
  • reactive metal chlorides for example sodium, calcium, potassium, etc.
  • Alkaline reactions then take place near the cathode, which generates an at least partial disintegration the ore particles contained in the corresponding ore container 30.
  • the ultrasonic bath 2 enhances the penetration of the substances produced near the cathode into the macro- and micropores of the ore particles contained in the corresponding ore container 30.
  • free hydrogen atoms are absorbed by platinum group metals (PGM) present in the ore particles, whereas this absorption is drastically increased by the ultrasonic bath 2.
  • PGM platinum group metals
  • the electrolytic processing of the ore particles enhanced by the ultrasonic bath 2 and preferably comprising a number of alternated cycles, cleans and fills the macro- and micropores of the ore particles with substances generated in the electrolytic bath 1 , thereby preparing the ore particles for a next step of the method of the invention.
  • the prepared ore particles which were submitted to the electrolytic bath enhanced by ultrasonic bath in a previous step of the method, are placed in a crucible 5.
  • the crucible 5 is preferably made of magnetite powder and fire clay.
  • the crucible 5 containing the ore particles is introduced into an oven 4, preferably a microwave oven, for shock heating of the ore particles, i.e. the ore particles are subjected to a very fast and important temperature increase.
  • the temperature of the ore particles is for example elevated to a temperature between 200 and 300°C within 60 to 180 seconds, preferably to 250°C within 120 seconds.
  • Shock heating of the ore particles is preferably performed in a microwave oven. Submitting the prepared ore particles to high power microwave radiations provokes high excitation of the heavy, semi-heavy and light water molecules in the ore particles, thereby rapidly increasing their temperature. Other technologies are however possible within the frame of the invention for shock heating the ore particles.
  • the PGM also release the previously absorbed hydrogen at a high pressure, which also participates to the disintegration of the ore particles and to the release of nanoparticles of noble metals.
  • reactive metal chlorides were used in the electrolytic bath, then, during shock heating, different salts, including for example bicarbonates, and alkalines which have dissolved in the electrolyte bath and have penetrated the macro- and micropores of the ore particles react with ore substances causing various chemical reactions. As a result of these chemical reactions, some ore substances become soluble, thereby further participating to the disintegration of the ore and the release of noble metals.
  • the shock microwave heating process for example lasts fifteen minutes at a microwave frequency of 2.45 GHz, the input power of the microwave radiation depending on the quantity of ore particles in the oven.
  • the disintegrated ore particles and the released nanoparticles are submitted to a next step of separation of noble metals from the remaining ore, preferably to a mechanical step of separation.
  • This step of separation according to a preferred embodiment of the invention is schematically illustrated in Fig. 3.
  • the step of separation uses gravity separation enhanced by ultrasounds.
  • the disintegrated ore preferably together with the remaining content of the crucible used for shock heating, is put into a preferably cone shaped container 7 made of a permeable material, for example a microporous nylon membrane.
  • the filled cone shaped container 7 is placed into an ultrasonic bath 6, preferably with its tip oriented towards the ground, for an ultrasonic induced gravity separation of the noble metals. Under the effect of the ultrasonic waves, the content of the container 7 is slightly agitated, and the noble metals and other by products tend to sink to the tip of the container 7, while the remains of the disintegrated ore particles are pushed towards the top.
  • separation technologies preferably mechanical technologies, are however possible within the frame of the invention.
  • separation of noble metals and other byproducts from the remains of the disintegrated ore particles is made through centrifugation of the crucible's content. Separation can also be performed with the help of electrostatic, magnetic and/or chemically-based techniques.
  • the remaining liquid from the electrolytic bath 1 and from the ultrasonic bath 6 and also the sludge, i.e. the remains of the disintegrated ore particles, are preferably tested for the presence of noble metals that are for example collected, i.e. separated, using similar or other separation techniques.
  • the method of the invention for the recovery of noble metals and other byproducts by disintegration of ore using nontoxic multi-step processing allows for a very high recovery rate (95 - 99.9%) and does not use any toxic substances like cyanide or mercury, thereby being environmentally friendly.

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

Abstract

La présente invention concerne un procédé de récupération de métaux nobles comprenant les étapes consistant à soumettre des particules de minerai à un bain électrolytique (1) amélioré par un bain ultrasonique (2), le bain électrolytique (1) comprenant de l'eau lourde et/ou semi-lourde, à chauffer par ondes de choc les particules de minerai pour les désintégrer, et à séparer les métaux nobles du reste desdites particules de minerai désintégrées.
PCT/EP2010/064678 2010-06-01 2010-10-01 Procédé de récupération de métaux nobles et d'autres sous-produits à partir d'un minerai Ceased WO2011150984A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN2010800676122A CN102947472A (zh) 2010-06-01 2010-10-01 从矿石中回收贵金属和其他副产品的方法
AU2010354435A AU2010354435A1 (en) 2010-06-01 2010-10-01 Method for recovering noble metals and other byproducts from ore
CA2800694A CA2800694A1 (fr) 2010-06-01 2010-10-01 Procede de recuperation de metaux nobles et d'autres sous-produits a partir d'un minerai
US13/701,245 US20130146477A1 (en) 2010-06-01 2010-10-01 Method for recovering noble metals and other byproducts from ore
EP10760350.8A EP2576850B1 (fr) 2010-06-01 2010-10-01 Procédé de récupération de métaux nobles et d'autres sous-produits à partir d'un minerai
EA201291166A EA201291166A1 (ru) 2010-06-01 2010-10-01 Способ извлечения благородных металлов и других побочных продуктов из руды
ZA2012/08874A ZA201208874B (en) 2010-06-01 2012-11-26 Method for recovering noble metals and other byproducts from ore

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10164665.1 2010-06-01
EP10164665 2010-06-01

Publications (1)

Publication Number Publication Date
WO2011150984A1 true WO2011150984A1 (fr) 2011-12-08

Family

ID=42989639

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/064678 Ceased WO2011150984A1 (fr) 2010-06-01 2010-10-01 Procédé de récupération de métaux nobles et d'autres sous-produits à partir d'un minerai

Country Status (9)

Country Link
US (1) US20130146477A1 (fr)
EP (1) EP2576850B1 (fr)
CN (1) CN102947472A (fr)
AP (1) AP2012006649A0 (fr)
AU (1) AU2010354435A1 (fr)
CA (1) CA2800694A1 (fr)
EA (1) EA201291166A1 (fr)
WO (1) WO2011150984A1 (fr)
ZA (1) ZA201208874B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2907899A1 (fr) * 2014-05-30 2015-08-19 Nicolae Costache Procédé et réacteur pour la récupération de métaux et d'éléments non métalliques et métalliques à partir d'objets contenant des composés organiques
WO2023175570A1 (fr) * 2022-03-16 2023-09-21 Flsmidth A/S Système et procédé de commande ou d'élimination de dépôts durs sur des cathodes d'extraction électrolytique
JP7719425B1 (ja) * 2024-03-26 2025-08-06 日本製鉄株式会社 粉末状の鉄鉱石
WO2025205275A1 (fr) * 2024-03-26 2025-10-02 日本製鉄株式会社 Minerai de fer en poudre

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139432A (en) * 1976-08-16 1979-02-13 Ghiringhelli Hugh A Process for electrochemically recovering precious metals from ores
US4980134A (en) * 1985-09-10 1990-12-25 Action Gold Development Ltd. Leaching process
RU2263152C1 (ru) 2004-04-29 2005-10-27 Галайко Владимир Васильевич Способ извлечения золота при гидромеханизированной разработке песков глинистых россыпей и валунчатых окисленных руд кор выветривания
WO2010057329A1 (fr) 2008-11-18 2010-05-27 Rb Ingeniería Ltda. Procédé sono-électrochimique permettant de traiter des concentrés de sulfures métalliques

Family Cites Families (11)

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GB497835A (en) * 1937-05-21 1938-12-21 William Henry Vale Junior A process for the separation of metals or metal compounds
US3772003A (en) * 1972-02-07 1973-11-13 J Gordy Process for the electrolytic recovery of lead, silver and zinc from their ore
CA1198080A (fr) * 1981-04-15 1985-12-17 Freeport Minerals Company Lixiviation et electrodeposition simultanees de metaux precieux
US4382845A (en) * 1981-08-10 1983-05-10 Chevron Research Company Selective electrowinning of palladium
US4406752A (en) * 1981-11-12 1983-09-27 General Electric Company Electrowinning of noble metals
GB8720279D0 (en) * 1987-08-27 1987-10-07 Tetronics Res & Dev Co Ltd Recovery of gold
CN1194109C (zh) * 2002-05-20 2005-03-23 严卓理 含砷硫有毒难处理物的金矿砂的超声预处理方法
CN1304612C (zh) * 2005-09-01 2007-03-14 徐致钢 从含铂族金属矿石中提取铂族金属的工艺
WO2007119239A2 (fr) * 2006-04-17 2007-10-25 E.R.S. Ltd. Procede permettant d'extraire des metaux a partir de minerai
CA2595275A1 (fr) * 2007-08-22 2009-02-22 David Pearce Lixiviation et precipitation sequentielles de metaux a partir de minerais refractaires par potentiels variables a oxydoreduction et systeme a ph variable
US9512012B2 (en) * 2007-12-08 2016-12-06 Comsats Institute Of Information Technology Sonoelectrolysis for metal removal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139432A (en) * 1976-08-16 1979-02-13 Ghiringhelli Hugh A Process for electrochemically recovering precious metals from ores
US4980134A (en) * 1985-09-10 1990-12-25 Action Gold Development Ltd. Leaching process
RU2263152C1 (ru) 2004-04-29 2005-10-27 Галайко Владимир Васильевич Способ извлечения золота при гидромеханизированной разработке песков глинистых россыпей и валунчатых окисленных руд кор выветривания
WO2010057329A1 (fr) 2008-11-18 2010-05-27 Rb Ingeniería Ltda. Procédé sono-électrochimique permettant de traiter des concentrés de sulfures métalliques

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2907899A1 (fr) * 2014-05-30 2015-08-19 Nicolae Costache Procédé et réacteur pour la récupération de métaux et d'éléments non métalliques et métalliques à partir d'objets contenant des composés organiques
WO2023175570A1 (fr) * 2022-03-16 2023-09-21 Flsmidth A/S Système et procédé de commande ou d'élimination de dépôts durs sur des cathodes d'extraction électrolytique
JP7719425B1 (ja) * 2024-03-26 2025-08-06 日本製鉄株式会社 粉末状の鉄鉱石
WO2025205275A1 (fr) * 2024-03-26 2025-10-02 日本製鉄株式会社 Minerai de fer en poudre

Also Published As

Publication number Publication date
AU2010354435A1 (en) 2012-12-20
US20130146477A1 (en) 2013-06-13
EP2576850A1 (fr) 2013-04-10
CN102947472A (zh) 2013-02-27
AP2012006649A0 (en) 2012-12-31
EA201291166A1 (ru) 2013-06-28
ZA201208874B (en) 2013-08-28
CA2800694A1 (fr) 2011-12-08
EP2576850B1 (fr) 2015-03-04

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