CN113832343A - Method for recovering gold in thiosulfate gold leaching system by precipitation method - Google Patents
Method for recovering gold in thiosulfate gold leaching system by precipitation method Download PDFInfo
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- CN113832343A CN113832343A CN202111045085.1A CN202111045085A CN113832343A CN 113832343 A CN113832343 A CN 113832343A CN 202111045085 A CN202111045085 A CN 202111045085A CN 113832343 A CN113832343 A CN 113832343A
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- gold
- thiosulfate
- leaching
- recovering
- recovery
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- 239000010931 gold Substances 0.000 title claims abstract description 73
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 66
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000002386 leaching Methods 0.000 title claims abstract description 38
- 238000001556 precipitation Methods 0.000 title claims abstract description 11
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 title claims abstract 7
- 238000011084 recovery Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 8
- 239000011734 sodium Substances 0.000 claims abstract description 8
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 7
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 239000005843 Thiram Substances 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 6
- 229960002447 thiram Drugs 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 3
- 239000010970 precious metal Substances 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- TVPFLPJBESCUKI-UHFFFAOYSA-M potassium;n,n-dimethylcarbamodithioate Chemical compound [K+].CN(C)C([S-])=S TVPFLPJBESCUKI-UHFFFAOYSA-M 0.000 abstract 2
- 238000003795 desorption Methods 0.000 abstract 1
- 239000012716 precipitator Substances 0.000 abstract 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 29
- 238000007654 immersion Methods 0.000 description 5
- NCTHNHPAQAVBEB-WGCWOXMQSA-M sodium ferulate Chemical compound [Na+].COC1=CC(\C=C\C([O-])=O)=CC=C1O NCTHNHPAQAVBEB-WGCWOXMQSA-M 0.000 description 4
- -1 gold ions Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000416536 Euproctis pseudoconspersa Species 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- MXZVHYUSLJAVOE-UHFFFAOYSA-N gold(3+);tricyanide Chemical compound [Au+3].N#[C-].N#[C-].N#[C-] MXZVHYUSLJAVOE-UHFFFAOYSA-N 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004102 ligand field theory Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 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
- 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
- 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
-
- 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
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for recovering gold in a thiosulfate gold leaching system by a precipitation method, and belongs to the field of precious metal recovery. The method of the invention uses cheap sodium or potassium dimethyldithiocarbamate (sodium or potassium dimethyldithiocarbamate for short) as a precipitator, and can realize the recovery of gold in the solution through simple precipitation, filtration and separation; the method provided by the invention has the advantages of simple process flow, easy operation, no need of large-scale equipment, no need of complicated steps such as adsorption and desorption, and the like, and can be used for recovering the gold in the thiosulfate gold leaching solution in a simple and efficient manner.
Description
Technical Field
The invention belongs to the technical field of precious metal recovery, and particularly relates to a method for recovering gold in a thiosulfate gold leaching system by a precipitation method.
Background
Gold is used in all fields because of its unique physicochemical properties. However, because of its own properties, gold is difficult to exist alone in nature, and often coexists with some elements in the minerals such as argentum-gold ore, bronze-gold ore, pyrite, and the like. The conventional gold leaching method is a cyanidation method, but various cyanide-containing wastes generated by the cyanidation method pollute the environment due to the high toxicity of cyanide, so the method is forbidden by some countries. The thiosulfate gold leaching method is called a non-cyanide gold extraction technology which is the most promising alternative to the cyanidation method because of the advantages of environmental protection, no toxicity, high leaching efficiency and the like. However, the problem of gold recovery difficulty in the thiosulfate gold leaching process has not been effectively solved. The current mainstream recovery methods include adsorption methods, solvent extraction methods, precipitation methods, and electrodeposition methods. Although the adsorption method, the solvent extraction method and the electrodeposition method have not been industrialized, the methods have been greatly developed under the promotion of various scholars. However, the precipitation method is difficult to develop.
The precipitation method is essentially a process of reducing gold by using a reducing metal simple substance, and gold ions are replaced by using a plurality of powder metal simple substances, but replacement reaction is also generated by other active ions in the immersion liquid, which causes a problem of high cost.
Disclosure of Invention
In view of the above-mentioned disadvantages of the method, the present invention aims to provide a new method for recovering gold in a thiosulfate gold leaching system by a precipitation method, which uses sodium thiram or potassium thiram as a precipitating agent to efficiently precipitate gold in the thiosulfate gold leaching system, and can realize the recovery of gold after filtration and separation, and specifically comprises the following steps:
(1) leaching the gold ore by a thiosulfate method to extract gold, filtering and separating to obtain a leaching solution, and adjusting the pH value of the leaching solution to 6-11;
(2) adding precipitant into the extractive solution at a solid-liquid ratio of 0.01-1:100, stirring for a while, filtering, and recovering the solid; the precipitant is sodium thiram or potassium thiram.
Preferably, the reaction temperature in step (2) of the present invention is 10 to 55 ℃ and the recovery efficiency is high in this temperature range.
Preferably, the stirring time in step (2) of the present invention is 5 to 60 min.
The principle of the invention is as follows: research finds that sodium ferulate can directly form complex precipitate with gold ions in a solution in a gold leaching solution, gold ions in the solution can be enriched only by filtering and separating, and anions (CH3)2 NCSS-formed after the sodium ferulate is dissolved in water and Au (I) can form a complex; and the sodium ferbamate is dissolved in water to form a sulfur atom in the dithioamino group, and a lone pair of electrons exists, so that the generated polarized negative electric field can promote the dithioamino group to attract and form a chemical bond with Au (I) according to the ligand field theory to generate a chelate.
The invention has the beneficial effects that:
(1) aiming at the problem of gold recovery in thiosulfate gold leaching solution, the gold in the leaching solution is directly recovered by precipitation with sodium ferbamate, so that the use of simple reducing metal can be avoided, and the cost is saved.
(2) The sodium ferbamate is cheap and easy to obtain, and has good recovery effect and short recovery time.
(3) The invention has wide application range and can carry out recovery operation in noble metal solutions with different concentrations.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto
Not limited to the contents.
Example 1
(1) Leaching certain gold ore by thiosulfate method to extract gold, filtering and separating to obtain thiosulfate gold leaching solution, which is Au (S)2O3)2 3-The concentration is 5.6 mg/L, 100mL of immersion liquid is taken and the pH value is adjusted to 6; wherein Cu in thiosulfate gold leaching method2 +Concentration of 5mmol/L, NH3/NH4+The concentration is 80mmol/L, S2O3 2-The concentration was 0.1 mol/L.
(2) 0.01 g of sodium ferulate was weighed into 100mL of the extract of step (1) at 10 ℃, stirred at 150r/min for 5 min and then filtered and separated, and the recovery of gold was found to be 97.5%.
Example 2
(1) Leaching a gold ore by a thiosulfate method to extract gold, filtering and separating to obtain thiosulfate gold leaching solution Au(S2O3)2 3-The concentration is 12.4 mg/L, 100mL of immersion liquid is taken and the pH value is adjusted to 7; wherein Cu in thiosulfate gold leaching method2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80mmol/L, S2O3 2-The concentration was 0.1 mol/L.
(2) 0.2g of sodium ferulate was weighed into 100mL of the extract of step (1), and stirred at 25 ℃ at 150r/min for 10 min, and the recovery of gold was found to be 99%.
Example 3
(1) Leaching certain gold ore by thiosulfate method to extract gold, filtering and separating to obtain thiosulfate gold leaching solution, which is Au (S)2O3)2 3-Taking 100mL of the extract with the concentration of 50.2 mg/L and adjusting the pH value to 8; wherein Cu in thiosulfate gold leaching method2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80mmol/L, S2O3 2-The concentration was 0.1 mol/L.
(2) At 25 ℃, 0.2g of potassium fomesate is weighed and added into 100mL of the extract obtained in the step (1), and after stirring for 20 min at 150r/min, the mixture is filtered and separated, and the recovery rate of gold is measured to be 97%.
Example 4
(1) Leaching certain gold ore by thiosulfate method to extract gold, filtering and separating to obtain thiosulfate gold leaching solution, which is Au (S)2O3)2 3-The concentration is 80.7 mg/L, 100mL of immersion liquid is taken and the pH value is adjusted to 10; wherein Cu in thiosulfate gold leaching method2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80mmol/L, S2O3 2-The concentration was 0.1 mol/L.
(2) 0.5 g of potassium fomesate was weighed into 100mL of the extract obtained in step (1), and stirred at 35 ℃ at 150r/min for 30 min, and the recovery rate of gold was determined to be 92%.
Example 5
(1) Leaching certain gold ore by thiosulfate method to extract gold, filtering and separating to obtain thiosulfate gold leaching solution, which is Au (S)2O3)2 3-Has a concentration of 200.8mgL, taking 100mL of immersion liquid and adjusting the pH value to 11; wherein Cu in thiosulfate gold leaching method2+Concentration of 5mmol/L, NH3/NH4+The concentration is 80mmol/L, S2O3 2-The concentration was 0.1 mol/L.
(2) At 55 ℃, 1 g of potassium fomesate is weighed and added into 100mL of the extract obtained in the step (1), and the mixture is stirred for 60 min at 150r/min and then is filtered and separated, and the recovery rate of gold is measured to be 99%.
While the present invention has been described in detail with reference to the specific embodiments thereof, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (3)
1. A method for recovering gold in a thiosulfate gold leaching system by a precipitation method is characterized by comprising the following steps:
(1) leaching the gold ore by a thiosulfate method to extract gold, filtering and separating to obtain a leaching solution, and adjusting the pH value of the leaching solution to 6-11;
(2) adding precipitant into the extractive solution at a solid-liquid ratio of 0.01-1:100, stirring for a while, filtering, and recovering the solid; the precipitant is sodium thiram or potassium thiram.
2. The method of gold recovery in a thiosulfate gold leaching system according to claim 1, characterized in that: the reaction temperature in the step (2) is 10-55 ℃.
3. The method of gold recovery in a thiosulfate gold leaching system according to claim 1, characterized in that: the stirring time in the step (2) is 5-60 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045085.1A CN113832343B (en) | 2021-09-07 | 2021-09-07 | Method for recovering gold in thiosulfate gold leaching system by precipitation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045085.1A CN113832343B (en) | 2021-09-07 | 2021-09-07 | Method for recovering gold in thiosulfate gold leaching system by precipitation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113832343A true CN113832343A (en) | 2021-12-24 |
| CN113832343B CN113832343B (en) | 2023-04-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2811640C1 (en) * | 2022-12-20 | 2024-01-15 | Акционерное общество "Иркутский научно-исследовательский институт благородных и редких металлов и алмазов" АО "Иргиредмет" | Method for gold extraction from ores and ore products by thiocyanate leaching |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5753125A (en) * | 1995-05-19 | 1998-05-19 | Kreisler; Lawrence | Method for recovering and separating metals from waste streams |
| US20090165818A1 (en) * | 2007-05-04 | 2009-07-02 | Ecolab Inc. | Cleaning compositions containing water soluble magnesium compounds and methods of using them |
| CN102978414A (en) * | 2012-11-28 | 2013-03-20 | 大连东泰产业废弃物处理有限公司 | Method for precipitating gold from cyanogen-containing gold-plated waste liquid |
| CN106414340A (en) * | 2014-04-02 | 2017-02-15 | 庄信万丰股份有限公司 | Mercury removal |
| CN112375911A (en) * | 2020-11-02 | 2021-02-19 | 昆明理工大学 | Direct recovery of (Au (S) with active carbon2O3)23-) Method (2) |
| CN112375919A (en) * | 2020-11-02 | 2021-02-19 | 昆明理工大学 | Method for directly recovering gold in thiosulfate system |
| CN114712893A (en) * | 2022-03-26 | 2022-07-08 | 昆明理工大学 | Method for recovering gold in thiosulfate solution |
-
2021
- 2021-09-07 CN CN202111045085.1A patent/CN113832343B/en active Active
Patent Citations (7)
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Non-Patent Citations (2)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2811640C1 (en) * | 2022-12-20 | 2024-01-15 | Акционерное общество "Иркутский научно-исследовательский институт благородных и редких металлов и алмазов" АО "Иргиредмет" | Method for gold extraction from ores and ore products by thiocyanate leaching |
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| CN113832343B (en) | 2023-04-18 |
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