WO2009017434A1 - Procédé d'extraction de métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires - Google Patents
Procédé d'extraction de métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires Download PDFInfo
- Publication number
- WO2009017434A1 WO2009017434A1 PCT/RU2007/000408 RU2007000408W WO2009017434A1 WO 2009017434 A1 WO2009017434 A1 WO 2009017434A1 RU 2007000408 W RU2007000408 W RU 2007000408W WO 2009017434 A1 WO2009017434 A1 WO 2009017434A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- raw materials
- ferrous
- rare
- radioactive
- mineral raw
- Prior art date
Links
- 239000002994 raw material Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 27
- 239000011707 mineral Substances 0.000 title claims abstract description 27
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 24
- 239000010970 precious metal Substances 0.000 title abstract 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 238000011282 treatment Methods 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000510 noble metal Inorganic materials 0.000 claims description 24
- 239000007800 oxidant agent Substances 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 10
- 238000002386 leaching Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 1
- 238000011221 initial treatment Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 27
- 239000011734 sodium Substances 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 235000015076 Shorea robusta Nutrition 0.000 description 7
- 244000166071 Shorea robusta Species 0.000 description 7
- VPCDQGACGWYTMC-UHFFFAOYSA-N nitrosyl chloride Chemical compound ClN=O VPCDQGACGWYTMC-UHFFFAOYSA-N 0.000 description 7
- 235000019392 nitrosyl chloride Nutrition 0.000 description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000004157 Nitrosyl chloride Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000004280 Sodium formate Substances 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- 238000005660 chlorination reaction Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 3
- 235000019254 sodium formate Nutrition 0.000 description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 241001274216 Naso Species 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 229910021381 transition metal chloride Inorganic materials 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- JQGGAELIYHNDQS-UHFFFAOYSA-N Nic 12 Natural products CC(C=CC(=O)C)c1ccc2C3C4OC4C5(O)CC=CC(=O)C5(C)C3CCc2c1 JQGGAELIYHNDQS-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 229910008046 SnC14 Inorganic materials 0.000 description 1
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000012320 chlorinating reagent Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/04—Blast roasting
-
- 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
-
- 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 method relates to pyrometallurgical technology and is used to extract non-ferrous, rare, radioactive and noble metals from refractory mineral raw materials, possibly containing natural carbon, sulfides or other refractory compounds.
- the disadvantages of this method include the high consumption of sodium chloride (10% by weight of the raw material) and the low degree of extraction of non-ferrous metals obtained as a result of the implementation of the above process.
- Titanium dioxide reacts with nitrosyl chloride according to the following reaction:
- TiO 2 + 4NOC1 TiCl 4 + 2NO + 2NO 2
- the disadvantages of this method include the high consumption of the reagent and the insufficient degree of extraction of the useful component.
- the disadvantages of this method include the high cost of transition metal chlorides used as reagents, as well as the lack of effectiveness of the proposed process.
- a UK patent is known 2 414 740 A dated 12/07/2005 proposing a method for extracting non-ferrous, rare and noble metals from mineral raw materials by treating it with a solution containing an oxidizing agent and a reducing agent simultaneously.
- a solution containing an oxidizing agent and a reducing agent simultaneously.
- fast radicals are formed that effectively dissolve non-ferrous, rare and noble metals from mineral raw materials.
- the disadvantage of this method is the possibility of incomplete extraction of non-ferrous, rare and noble metals in the presence of highly active organic matter in mineral raw materials.
- a large amount of oxidizer is spent on the oxidation of organic matter, and in the case of incomplete oxidation, the organic substance absorbs significant amounts of dissolved metals, which leads to the loss of valuable metals with the tailings of the process.
- the challenge facing the inventors was to develop a method for the extraction of non-ferrous, rare, radioactive and noble metals from refractory mineral raw materials, devoid of the above disadvantages, which provides a high degree of extraction of non-ferrous, rare, radioactive and noble metals with high profitability of production.
- the essence of the claimed invention lies in the fact that to implement the task, a method is proposed for the extraction of non-ferrous, rare, radioactive and noble metals from refractory mineral raw materials, which at the first stage involves the processing of raw materials with a solution of donor-acceptor oxidizing agents and reducing agents with the formation of water-soluble colored, rare salts, radioactive and noble metals.
- the raw material is dried to full evaporation of water and then fired in the presence of oxygen at a temperature that does not cause the formation of insoluble salts. Firing of mineral raw materials in the presence of oxygen causes the destruction of highly active organic matter and releases the water-soluble metal salts absorbed by it.
- non-ferrous, rare, radioactive and noble metals are leached from mineral raw materials by known technological methods.
- radicals are formed - oxygen superoxide, atomic oxygen and other highly active compounds, including oxidizing agents of reducing agents, which allow the effective oxidation and dissolution of non-ferrous, rare and noble metals contained in mineral raw materials, for example:
- Non-ferrous, rare, radioactive and noble metals are oxidized and converted into water-soluble chlorides of these metals: CuC12, ZnC12, CoC12, NiC12, BiC12, ReC14, S recharge ⁇ l ⁇ , YC13, La ⁇ l ⁇ , PbC12, [AuC14] -4, AgCl, H2 [PtC16 ], H2 [PdC16], H2 [IrC16], H2 [RoC16], H2 [RuC16], MnC12, ⁇ réelle ⁇ l ⁇ , ⁇ r ⁇ I ⁇ , Nd ⁇ l ⁇ , Sm ⁇ l ⁇ , Eu ⁇ l ⁇ , Gd ⁇ l ⁇ , ⁇ b ⁇ l ⁇ , ⁇ ErCB ⁇ m ⁇ l ⁇ , Yb ⁇ l ⁇ .
- Non-ferrous, rare, radioactive and noble metals for additional extraction of non-ferrous, rare, radioactive and noble metals from active carbon contained in refractory mineral raw materials, it is proposed to dry the pulp obtained after treatment with donor-acceptor oxidizing agents and reducing agents until the water completely evaporates in the presence of oxygen at a temperature sufficient to burn carbon, but not causing the formation of insoluble salts.
- Non-ferrous, rare, radioactive and noble metals, absorbed in the form of salts by active carbon are catalysts for its interaction with oxygen, and thus contribute to the complete burnout of the carbon substance.
- the combination “at the beginning of firing, and then leaching” does not give positive results, because in the absence of metal salts, the carbonaceous substance does not completely burn out during firing.
- Firing can be carried out in the presence of air or oxygen-rich blast at temperatures from 350 to 700 degrees Celsius, mainly at 580-650 degrees Celsius.
- oxygen-enriched air reduces the firing temperature and prevents the formation of insoluble salts.
- non-ferrous, rare, radioactive and noble metals are dissolved by known technological methods such as dissolution with acids, alkaline solutions or special extractants. From technological solutions, non-ferrous, rare, radioactive and noble metals are recovered by known methods such as collection, extraction, reduction or precipitation in the form of insoluble salts. Technological solutions after the extraction of dissolved metals from them can be used as the initial liquid phase for the preparation of solutions of donor-acceptor oxidizing agents and reducing agents and their primary processing of raw materials. Examples of specific performance:
- the sample was treated with dictioneem shales of the following chemical composition - SiO 2 - 50-55%, Al 2 O 3 - 10-15.3%, Fe 2 O 3 - 3.1-6.0%, FeO - 0 - 3.4%, MgO - 0.7-3.0%, CaO - 0.5-4.7%, Na 2 O - 0.1-0.6%, K 2 O - 4.2-5.6%, P. p.p. - 13.9-20.6%, P 2 O 5 - 0.4-0.7%, S - 1.3-1.7%, Corg - 3.8 15.1%.
- the sample was subjected to processing dictioneem shales of the following chemical composition - SiO 2 - 50-55%, Al 2 O 3 - 10-15.3%, Fe 2 O 3 - 3.1-6.0%, FeO - O- 3.4%, MgO - 0.7-3.0%, CaO - 0.5-4.7%, Na 2 O - 0.1-0.6%, K 2 O - 4.2-5.6% , ILp.p. - 13.9-20.6%, P 2 O 5 - 0.4-0.7%, S - 1.3-1.7%, Corg - 3.8 15.1%.
- the obtained data show that an increase in the partial oxygen pressure in the blast reduces the firing temperature without reducing the efficiency of metal extraction into the solution.
- the sample was treated with dictioneem shales of the following chemical composition - SiO 2 - 50-55%, Al 2 O 3 - 10-15.3%, Fe 2 O 3 - 3.1-6.0%, FeO - 0 - 3.4%, MgO - 0.7-3.0%, CaO - 0.5-4.7%, Na 2 O - 0.1-0.6%, K 2 O - 4.2-5.6%, ILp. P. - 13.9-20.6%, P 2 O 5 - 0.4-0.7%, S - 1.3-1.7%, Corg - 3.8 15.1%.
- the pulp After treatment with a solution of donor-acceptor oxidizing agents and reducing agents, the pulp was dried to a dry state and then fired for 30 minutes at a temperature of 450 degrees Celsius in the presence of air enriched with oxygen obtained by the membrane method to a concentration of 45% vol.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
La présente invention concerne un procédé d'extraction de métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires et peut s'utiliser dans l'industrie. Elle décrit un procédé d'extraction de métaux non ferreux, radioactifs ou nobles qui permet, via un traitement par une solution de diluants et oxydants donneur / accepteur lors d'un séchage et d'un recuit ultérieurs, d'alcaliniser des métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires. Les matières premières minérales ayant subi ce traitement sont séchées jusqu'à la disparition totale de l'eau puis recuits en présence de l'oxygène à une température suffisante pour le brûlage de carbone sans provoquer de l'apparition de sels insolubles. Le recuit peut s'effectuer en présence de l'air ou de soufflage enrichi par oxygène, à des températures entre 350 et 700 °C, de préférence 580-650°C, et l'on peut utiliser pour un traitement primaire des matières premières minérales réfractaires des solutions de diluants et oxydants donneur / accepteur préparés à partir de solutions technologiques de circulation. L'invention permet d'extraire des métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires et de réduire les pertes dus à la production.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2008152148/02A RU2415953C2 (ru) | 2007-07-30 | 2007-07-30 | Способ извлечения цветных, редких, радиоактивных и благородных металлов из упорного минерального сырья |
| PCT/RU2007/000408 WO2009017434A1 (fr) | 2007-07-30 | 2007-07-30 | Procédé d'extraction de métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU2007/000408 WO2009017434A1 (fr) | 2007-07-30 | 2007-07-30 | Procédé d'extraction de métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009017434A1 true WO2009017434A1 (fr) | 2009-02-05 |
Family
ID=40304547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RU2007/000408 WO2009017434A1 (fr) | 2007-07-30 | 2007-07-30 | Procédé d'extraction de métaux non ferreux, radioactifs ou nobles à partir de matières premières minérales réfractaires |
Country Status (2)
| Country | Link |
|---|---|
| RU (1) | RU2415953C2 (fr) |
| WO (1) | WO2009017434A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11408053B2 (en) | 2015-04-21 | 2022-08-09 | Excir Works Corp. | Methods for selective leaching and extraction of precious metals in organic solvents |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561947A (en) * | 1983-02-22 | 1985-12-31 | Skw Trostberg Aktiengesellschaft | Process for the recovery of noble metals from ores; which process uses thiourea |
| US5169503A (en) * | 1988-06-24 | 1992-12-08 | Baughman David R | Process for extracting metal values from ores |
| RU2119963C1 (ru) * | 1997-08-26 | 1998-10-10 | Общество с ограниченной ответственностью "СОЛИТЭК" | Способ извлечения золота из упорных руд и концентратов |
| WO2004087970A1 (fr) * | 2003-04-02 | 2004-10-14 | Shapovalov Viatcheslav Dmitrie | Procede de recuperation de metaux non ferreux, rares et precieux dans des minerais robustes |
-
2007
- 2007-07-30 WO PCT/RU2007/000408 patent/WO2009017434A1/fr active Application Filing
- 2007-07-30 RU RU2008152148/02A patent/RU2415953C2/ru not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561947A (en) * | 1983-02-22 | 1985-12-31 | Skw Trostberg Aktiengesellschaft | Process for the recovery of noble metals from ores; which process uses thiourea |
| US5169503A (en) * | 1988-06-24 | 1992-12-08 | Baughman David R | Process for extracting metal values from ores |
| RU2119963C1 (ru) * | 1997-08-26 | 1998-10-10 | Общество с ограниченной ответственностью "СОЛИТЭК" | Способ извлечения золота из упорных руд и концентратов |
| WO2004087970A1 (fr) * | 2003-04-02 | 2004-10-14 | Shapovalov Viatcheslav Dmitrie | Procede de recuperation de metaux non ferreux, rares et precieux dans des minerais robustes |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11408053B2 (en) | 2015-04-21 | 2022-08-09 | Excir Works Corp. | Methods for selective leaching and extraction of precious metals in organic solvents |
| US11427886B2 (en) | 2015-04-21 | 2022-08-30 | Excir Works Corp. | Methods for simultaneous leaching and extraction of precious metals |
| US11814698B2 (en) | 2015-04-21 | 2023-11-14 | Excir Works Corp. | Methods for simultaneous leaching and extraction of precious metals |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2415953C2 (ru) | 2011-04-10 |
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