CN114540635A - Method for extracting gold by catalyzing thiosulfate - Google Patents
Method for extracting gold by catalyzing thiosulfate Download PDFInfo
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- CN114540635A CN114540635A CN202210088686.9A CN202210088686A CN114540635A CN 114540635 A CN114540635 A CN 114540635A CN 202210088686 A CN202210088686 A CN 202210088686A CN 114540635 A CN114540635 A CN 114540635A
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- Prior art keywords
- gold
- resin
- thiosulfate
- leaching
- ore pulp
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- 239000010931 gold Substances 0.000 title claims abstract description 245
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 241
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 240
- 238000000034 method Methods 0.000 title claims abstract description 56
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 title abstract 3
- 239000011347 resin Substances 0.000 claims abstract description 140
- 229920005989 resin Polymers 0.000 claims abstract description 140
- 238000002386 leaching Methods 0.000 claims abstract description 90
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000004471 Glycine Substances 0.000 claims abstract description 39
- MEYVLGVRTYSQHI-UHFFFAOYSA-L cobalt(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Co+2].[O-]S([O-])(=O)=O MEYVLGVRTYSQHI-UHFFFAOYSA-L 0.000 claims abstract description 33
- 239000012141 concentrate Substances 0.000 claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 claims abstract description 21
- RRIWRJBSCGCBID-UHFFFAOYSA-L nickel sulfate hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-]S([O-])(=O)=O RRIWRJBSCGCBID-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229940116202 nickel sulfate hexahydrate Drugs 0.000 claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000001179 sorption measurement Methods 0.000 claims description 67
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 claims description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 32
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 22
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- 239000011780 sodium chloride Substances 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 15
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 12
- 235000010265 sodium sulphite Nutrition 0.000 claims description 6
- 239000003957 anion exchange resin Substances 0.000 claims description 5
- DHMQDGOQFOQNFH-UHFFFAOYSA-M Aminoacetate Chemical compound NCC([O-])=O DHMQDGOQFOQNFH-UHFFFAOYSA-M 0.000 claims description 2
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 claims description 2
- OFNJDDJDXNMTHZ-UHFFFAOYSA-L calcium;2-aminoacetate Chemical compound [Ca+2].NCC([O-])=O.NCC([O-])=O OFNJDDJDXNMTHZ-UHFFFAOYSA-L 0.000 claims description 2
- 235000013905 glycine and its sodium salt Nutrition 0.000 claims description 2
- 239000004247 glycine and its sodium salt Substances 0.000 claims description 2
- 229940029258 sodium glycinate Drugs 0.000 claims description 2
- WUWHFEHKUQVYLF-UHFFFAOYSA-M sodium;2-aminoacetate Chemical compound [Na+].NCC([O-])=O WUWHFEHKUQVYLF-UHFFFAOYSA-M 0.000 claims description 2
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 abstract description 9
- 238000003795 desorption Methods 0.000 description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- PODWXQQNRWNDGD-UHFFFAOYSA-L sodium thiosulfate pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].[O-]S([S-])(=O)=O PODWXQQNRWNDGD-UHFFFAOYSA-L 0.000 description 17
- 239000010949 copper Substances 0.000 description 16
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 11
- 239000010941 cobalt Substances 0.000 description 11
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 11
- 239000002994 raw material Substances 0.000 description 11
- 229910017052 cobalt Inorganic materials 0.000 description 10
- 238000011068 loading method Methods 0.000 description 10
- 229910052759 nickel Inorganic materials 0.000 description 10
- 239000011734 sodium Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 238000011084 recovery Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- -1 thiosulfate radical ions Chemical class 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 231100000086 high toxicity Toxicity 0.000 description 3
- 231100000252 nontoxic Toxicity 0.000 description 3
- 230000003000 nontoxic effect Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001429 cobalt ion Inorganic materials 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- C22B3/06—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
- C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
-
- 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)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A method for extracting gold by using a catalytic thiosulfate comprises the following steps: (1) finely grinding the gold concentrate, and then mixing into ore pulp; (2) adding glycine or glycine metal salt, cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate and thiosulfate into the ore pulp, and adjusting the pH value of the ore pulp to leach gold; adding resin into the leaching solution to adsorb gold to obtain gold-loaded resin; or adding resin to adsorb gold in the gold leaching process to obtain gold-loaded resin; (3) and desorbing gold from the gold-loaded resin by using a desorbent to obtain a gold-rich solution. Compared with copper-ammonia catalysis, the gold extraction process has better gold leaching rate, the highest leaching rate of the first-stage gold leaching can reach more than 90%, and the first-stage gold leaching rate of the copper-ammonia catalysis can only reach about 83%.
Description
Technical Field
The invention belongs to the field of hydrometallurgy, and particularly relates to a method for extracting gold by catalyzing thiosulfate.
Background
In the extraction method of gold, the cyanidation method has been used for more than 100 years, has the advantages of simple and mature process, high gold recovery rate and the like, and is the main gold extraction technology in the gold industry at present. However, cyanide is extremely toxic and harmful to the environment, and has poor leaching effect on copper-containing and carbon-containing gold ores. Therefore, the development of a clean and nontoxic non-cyaniding gold extraction technology has important significance for the healthy development of the gold industry. The thiosulfate method is a non-cyaniding gold extraction method which is widely considered to have the most potential to replace cyaniding, has the advantages of environment-friendly and non-toxic reagent, low price, better selectivity to gold, insensitivity to gold robbing carbon, high gold leaching rate and capability of being carried out in an alkaline mediumAnd the like, but the leaching rate of the thiosulfate method is very slow in the absence of the catalyst. Therefore, the traditional technology needs to introduce a copper-ammonia catalytic system to improve the gold leaching rate, but has three problems of large leaching agent consumption, ammonia threatening environment and complex gold recovery process of leaching liquid, and seriously hinders the industrial application and popularization of the technology. Cu (NH) in leaching solution of copper-ammonia catalytic system3)4 2+To S2O3 2-The strong oxidation (reaction formula shown in 1-1) results in a large leaching agent consumption. The ion exchange resin adsorption method is widely considered to be most suitable for recovering gold from the leachate, but due to the similarity of the ligand type and the electronic structure, Cu (S)2O3)3 5-And Au (S)2O3)2 3-The complex ions generate strong competitive adsorption on the surface of the resin, so that copper must be desorbed first and then gold must be desorbed when the gold-loaded resin is desorbed, otherwise, the purity of the gold desorption solution is seriously influenced. Therefore, the gold recovery process is complicated, and the volatility and high toxicity of ammonia pose a great threat to the atmosphere and water bodies. Therefore, many researchers have recently conducted research into new catalytic systems in an attempt to replace the conventional copper-ammonia catalytic system.
2Cu(NH3)4 2++8S2O3 2-＝2Cu(S2O3)3 5-+8NH3+S4O6 2- (1-1)。
While new catalytic systems are currently under investigation. Currently, there are studies: an NH-free gold ore of the sulphide type with carbon, pretreated by pressure oxidation, specific to Goldstrike's mine, developed by Barrickgold3Cu (I) -CaS of2O3The system carries out leaching to obtain higher gold recovery rate, but Cu (S) still exists in the system2O3)3 5-For Au (S)2O3)2 3-Adsorption on the resin surface creates a strong competition. For easily-leached quartz vein-type gold ore, researchers have used Cu (II) -EDA to catalyze S2O3 2–Leaching, prolonging the leaching time of the system, and reaching the effect ofCopper-ammonia catalyzed equivalent gold leaching rate, and S2O3 2–The consumption of the catalyst is remarkably reduced, but the ethylene diamine has high toxicity and high price, and the application of the ethylene diamine is limited. There have also been studies on Fe (III) -EDTA or Fe (III) -C2O4 2–The catalytic thiosulfate gold leaching process is researched, but the iron-based catalytic system has strict requirements on pH, and the catalytic capability of the iron-based catalytic system needs to be added with thiourea which can be carcinogenic so as to improve the leaching rate of gold. For gold ores of one silicate type and four sulfide types, Ni (II) -NH has been used by researchers3Catalysis of S2O3 2–The leaching research shows that Ni (II) -NH3The catalysis can achieve the gold leaching capacity equivalent to that of copper-ammonia catalysis, the consumption of a leaching agent is obviously reduced, the recovery rate of gold in a leaching solution by a resin adsorption method is higher, but ammonia which is not environment-friendly still needs to be used in the system.
In conclusion, the existing research of new catalytic systems can not completely solve the three problems of large leaching agent consumption, environmental threat of ammonia and complex gold recovery process in the gold extraction by the copper-ammonia catalytic thiosulfate method.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for extracting gold by catalyzing thiosulfate, which overcomes the defects and shortcomings in the background technology.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for extracting gold from thiosulfate in a catalytic mode comprises the following steps:
(1) finely grinding the gold concentrate, and then mixing into ore pulp;
(2) adding glycine or glycine metal salt, cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate and thiosulfate into the ore pulp, adjusting the pH value of the ore pulp, and leaching gold; adding resin into the leaching solution to adsorb gold to obtain gold-loaded resin;
(3) and desorbing gold from the gold-loaded resin by using a desorbent to obtain a gold-rich solution.
The invention also provides another method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the gold concentrate, and then mixing into ore pulp;
(2) adding glycine or glycine metal salt, cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate and thiosulfate into the ore pulp, adjusting the pH value of the ore pulp to carry out gold leaching, and adding resin to adsorb gold in the gold leaching process to obtain gold-loaded resin;
(3) and desorbing gold from the gold-loaded resin by using a desorbent to obtain a gold-rich solution.
In the method for extracting gold by using thiosulfate, preferably, in the step (2), the initial concentration of glycine or a glycine metal salt is 0.05-0.5 mol/L;
the initial concentration of the cobalt sulfate heptahydrate or/and the nickel sulfate hexahydrate is 0.005-0.05 mol/L;
the initial concentration of thiosulfate is 0.1 to 1 mol/L.
Preferably, in the step (2), the pH of the ore pulp is adjusted by using sodium hydroxide, and the pH of the ore pulp is adjusted to 9-11.
In the method for catalytic gold extraction by using thiosulfate, preferably, in the step (2), the metal glycinate is at least one of sodium glycinate and calcium glycinate, and the thiosulfate is at least one of sodium thiosulfate and ammonium thiosulfate.
Preferably, in the step (2), the gold leaching process is carried out in an air atmosphere, the gold leaching temperature is 0-50 ℃, the gold leaching time is 8.0-24.0 hours, and the stirring speed is controlled at 100-400 r/min.
Preferably, in the step (3), the desorbent is a mixed solution of sodium sulfite and sodium chloride, the dosage of the desorbent is 10-30 resin bed volumes, and the flow rate of the desorbent is 2-6 resin bed volumes/hour; in the mixed solution of sodium sulfite and sodium chloride, the concentration of the sodium sulfite is 0.1-0.6 mol/L, and the concentration of the sodium chloride is 1-3 mol/L.
Preferably, in the step (1), the granularity of the gold concentrate after fine grinding is-74 microns and accounts for more than 80%, and the mass concentration of the ore pulp is 15-35%.
Preferably, in the step (2), the resin is strongly basic anion exchange resin (such as IRA-400, Tulsion a-21S, etc.), the addition amount of the resin is 10-50 g/L, and the adsorption time of the resin is 0.5-1.5 h.
Preferably, in the step (2), the resin is a strongly basic anion exchange resin (such as IRA-400, Tulsion a-21S, etc.), the addition amount of the resin is 10-50 g/L, and the adsorption time of the resin is 8.0-24 h.
Compared with the prior art, the invention has the advantages that:
(1) in the process of leaching gold by catalyzing thiosulfate through cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate, glycine or glycine metal salt is preferentially adsorbed on the surface of gold to generate a gold glycine complex, and is further combined with thiosulfate radical ions to generate a gold glycine thiosulfate radical complex with higher stability, so that the direct contact of thiosulfate radical ions and the surface of the gold is avoided, the passivation of decomposition products of the thiosulfate radical ions on the surface of the gold is eliminated, and the leaching rate of the gold in thiosulfate solution is remarkably improved. Compared with copper-ammonia catalysis, the gold extraction process has better gold leaching rate, the highest leaching rate of the first-stage gold leaching can reach more than 90%, and the first-stage gold leaching rate of the copper-ammonia catalysis can only reach about 83%.
(2) In the process of leaching gold by adopting cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate, glycine or glycine metal salt to catalyze thiosulfate, glycine or glycine metal salt can form a relatively stable complex with cobalt/nickel ions, so that the transition metal ion pair S is weakened2O3 2-The consumption of thiosulfate is obviously reduced to 20-30 kg/t (namely, 20-30 kg of thiosulfate is consumed by each ton of gold concentrate), and the traditional Cu-NH is adopted3-S2O3 2-Due to Cu (NH) in the system3)4 2+To S2O3 2-The strong oxidation of (A) results in thiosulfideThe consumption of the acid salt leaching agent is about 50kg/t, and the consumption of the leaching agent is large.
(3) In the process of leaching gold by catalyzing thiosulfate through cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate, glycine or metal salt of glycine, cobalt/nickel complex ions mainly exist in a cation form and have very weak affinity with strong-base anion exchange resin, so that the cobalt/nickel is not basically adsorbed on the surface of the resin, the gold-loaded resin obtained by the system only needs to be desorbed for one time, the gold recovery process of the leaching solution is simpler, and the traditional Cu-NH is adopted3-S2O3 2-In the system, since Cu (S)2O3)3 5–And Au (S)2O3)2 3–Similarity of ligand type, electronic structure, Cu (S)2O3)3 5–For Au (S)2O3)2 3–The adsorption on the resin surface produces strong competition, resulting in a complex gold recovery process.
(4) In the gold extraction process of the invention, S2O3 2-Is significantly reduced, and its decomposition products such as SO3 2-、SxO6 2-The concentration of the leaching agent is correspondingly reduced, and the components of the leaching agent are simpler, thereby being beneficial to the recycling of the leaching agent.
(5) In the gold extraction process, the non-volatile and non-toxic glycine is used to replace ammonia water with strong volatility and high toxicity, so that the threat of ammonia to the life health of human bodies and the surrounding environment is avoided.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The following examples and comparative examples all used sulphidic gold concentrates with main phases of pyrite and silica, a gold grade of 48g/t and gold mainly in the form of monomeric gold + intergrown gold, the chemical phase analysis of which is shown in table 1.
TABLE 1 chemical phase analysis of gold concentrates
Comparative example 1:
the gold extraction method of the comparative example comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) firstly, adding ammonia water into the ore pulp obtained in the step (1) until the concentration is 1mol/L, adjusting the pH value of the ore pulp to 9.8 by using sulfuric acid, then sequentially adding copper sulfate pentahydrate and sodium thiosulfate pentahydrate into the ore pulp until the concentrations are 0.015mol/L and 0.3mol/L respectively, and adjusting the pH value of the ore pulp to 10.0 by using sodium hydroxide; then leaching for 8.0h in an air atmosphere at the temperature of 35 ℃ and the stirring speed of 300r/min, wherein the leaching rate of the final gold is 82.92%, and the consumption of sodium thiosulfate is 55.6kg/t (namely, 55.6kg of sodium thiosulfate is consumed by each ton of gold concentrate);
(3) adding IRA-400 strong basic resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the using amount of the resin is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, the adsorption rate of gold on the gold-loaded resin can reach 83.47% after adsorption is finished, and the adsorption rate of copper is 31.33%;
(4) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and firstly, 0.5mol/L (NH) is adopted4)2S2O3The solution flows through a resin column from top to bottom to desorb copper dynamically, and then 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the dosage is 15 resin bed volumes, the finally obtained copper desorption rate is 95.1%, and the gold desorption rate is 96.13%.
Example 1:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.005mol/L, 0.05mol/L and 0.10mol/L respectively, and adding sodium hydroxide to adjust the pH value of the ore pulp to 10.0; then leaching for 8.0h in an air atmosphere at the temperature of 50 ℃ and the stirring speed of 300r/min, wherein the leaching rate of the final gold is 94.4 percent, and the consumption of the sodium thiosulfate is 21.53kg/t (namely, the consumption of the sodium thiosulfate per ton of the gold concentrate is 21.53 kg);
(3) adding IRA-400 strong basic resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the using amount of the resin is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, the adsorption rate of gold on the gold-loaded resin can reach 89.96% after adsorption is finished, and the adsorption rate of cobalt is 1.07%;
(4) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the dosage is 15 resin bed volumes, and the desorption rate of the gold is 97.21 percent finally.
Example 2:
the difference between the present example and example 1 is only that the cobalt sulfate heptahydrate in step (2) is replaced by nickel sulfate hexahydrate, the other process parameters are completely consistent with those of example 1, the leaching rate of gold in step (2) is 89.41%, the consumption of sodium thiosulfate is 22.7kg/t, the adsorption rate of resin to gold in step (3) can reach 97.66%, the adsorption rate of nickel is 0.81%, and the maximum desorption rate of gold in step (4) is 98.4%.
Example 3:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.015mol/L, 0.15mol/L and 0.30mol/L respectively, and adding sodium hydroxide to adjust the pH value of the ore pulp to 10.0; then leaching for 8.0h in an air atmosphere at the temperature of 50 ℃ and at the stirring speed of 300r/min, wherein the final leaching rate of gold is 95.86%, and the consumption of sodium thiosulfate is 23.4 kg/t;
(3) adding IRA-400 strong basic resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the using amount of the resin is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, the adsorption rate of gold on the gold-loaded resin can reach 89.84% after adsorption is finished, and the adsorption rate of cobalt is 0.85%;
(4) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the dosage is 15 resin bed volumes, and the desorption rate of the gold is 97.58 percent finally.
Example 4:
the difference between the present example and example 3 is only that the cobalt sulfate heptahydrate in step (2) is replaced by nickel sulfate hexahydrate, the other process parameters are completely consistent with those of example 3, the leaching rate of gold in step (2) is 91.46%, the consumption of sodium thiosulfate is 23.14kg/t, the adsorption rate of resin to gold in step (3) can reach 98.2%, the adsorption rate of nickel is 0.94%, and the maximum desorption rate of gold in step (4) is 97.93%.
Example 5:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.05mol/L, 0.5mol/L and 0.50mol/L respectively, and adding sodium hydroxide to adjust the pH value of the ore pulp to 10.0; then leaching for 8.0h in an air atmosphere at the temperature of 50 ℃ and at the stirring speed of 300r/min, wherein the final leaching rate of gold is 96.12 percent, and the consumption of sodium thiosulfate is 25.26 kg/t;
(3) adding IRA-400 strong basic resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the using amount of the resin is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, after the adsorption is finished, the adsorption rate of gold on the gold-loaded resin can reach 91.24%, and the adsorption rate of cobalt is 0.98%;
(4) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the consumption is 15 resin bed volumes, and the desorption rate of the gold is 97.7 percent finally.
Example 6:
the difference between the embodiment and the embodiment 5 is only that the cobalt sulfate heptahydrate in the step (2) is changed into nickel sulfate hexahydrate, other process parameters are completely consistent with the embodiment 5, the leaching rate of gold in the step (2) is 91.88%, the consumption of sodium thiosulfate is 23.97kg/t, the adsorption rate of resin to gold in the step (3) can reach 98.42%, the adsorption rate of nickel is 0.88%, and the maximum resolution rate of gold in the step (4) is 98.34%.
Example 7:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.015mol/L, 0.15mol/L and 0.30mol/L respectively, and adding sodium hydroxide to adjust the pH value of the ore pulp to 9.0; then leaching for 8.0h in an air atmosphere at the temperature of 50 ℃ and at the stirring speed of 300r/min, wherein the final leaching rate of gold is 90.62%, and the consumption of sodium thiosulfate is 21.8 kg/t;
(3) adding IRA-400 strong basic resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the using amount of the resin is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, and after the adsorption is finished, the adsorption rate of gold on the gold-loaded resin can reach 88.72%, and the adsorption rate of cobalt is 0.89%;
(4) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the consumption is 15 resin bed volumes, and the desorption rate of the gold is 98.01 percent finally.
Example 8:
the difference between the embodiment and the embodiment 7 is only that the cobalt sulfate heptahydrate in the step (2) is replaced by nickel sulfate hexahydrate, other process parameters are completely consistent with the embodiment 7, the leaching rate of gold in the step (2) is 87.6%, the consumption of sodium thiosulfate is 20.41kg/t, the adsorption rate of resin to gold in the step (3) can reach 97.84%, the adsorption rate of nickel is 1.02%, and the maximum resolution rate of gold in the step (4) is 97.78%.
Example 9:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.015mol/L, 0.15mol/L and 0.30mol/L respectively, and adding sodium hydroxide to adjust the pH value of the ore pulp to 11.0; then leaching for 8.0h in an air atmosphere at the temperature of 50 ℃ and at the stirring speed of 300r/min, wherein the leaching rate of the gold is 91.15 percent, and the consumption of the sodium thiosulfate is 25.55 kg/t;
(3) adding IRA-400 strong basic resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the using amount of the resin is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, and after the adsorption is finished, the adsorption rate of gold on the gold-loaded resin can reach 90.4%, and the adsorption rate of cobalt is 1.21%;
(4) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the consumption is 15 resin bed volumes, and the desorption rate of the gold is 97.4 percent finally.
Example 10:
the difference between the embodiment and the embodiment 9 is only that the cobalt sulfate heptahydrate in the step (2) is changed into nickel sulfate hexahydrate, other process parameters are completely consistent with the embodiment 9, the leaching rate of gold in the step (2) is 88.31%, the consumption of sodium thiosulfate is 26.13kg/t, the adsorption rate of resin to gold in the step (3) can reach 98.37%, the adsorption rate of nickel is 0.93%, and the maximum desorption rate of gold in the step (4) is 98.14%.
Comparative example 2:
the gold extraction method of the comparative example comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) firstly, adding ammonia water into the ore pulp obtained in the step (1) until the concentration is 1mol/L, adjusting the pH value of the ore pulp to 9.8 by using sulfuric acid, sequentially adding copper sulfate pentahydrate and sodium thiosulfate pentahydrate into the ore pulp until the concentrations are 0.015mol/L and 0.3mol/L respectively, adjusting the pH value of the ore pulp to 10.0 by using sodium hydroxide, and finally adding IRA-400 strong basic resin into the ore pulp to adsorb gold, wherein the dosage of the resin is 40 g/L; then leaching and adsorbing for 8.0h in air atmosphere at the temperature of 35 ℃ and the stirring speed of 300 r/min; after leaching and adsorption, the leaching rate of gold is 84.01%, the adsorption rate of gold on the gold-loaded resin can reach 84.66%, the adsorption rate of copper is 34.8%, and the consumption of sodium thiosulfate is 53.4 kg/t;
(3) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and firstly, 0.5mol/L (NH) is adopted4)2S2O3The solution flows through a resin column from top to bottom to desorb copper dynamically, and then 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the dosage is 15 resin bed volumes, the finally obtained copper desorption rate is 95.62%, and the gold desorption rate is 95.89%.
Example 11:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.005mol/L, 0.05mol/L and 0.10mol/L respectively, adding sodium hydroxide to adjust the pH of the ore pulp to 10.0, and finally adding IRA-400 strong-base resin into the ore pulp to adsorb gold, wherein the dosage of the resin is 40 g/L; then leaching and adsorbing for 8.0h in air atmosphere at the temperature of 35 ℃ and the stirring speed of 300 r/min; after leaching and adsorption, the leaching rate of gold is 93.72%, the adsorption rate of gold on the gold-loaded resin can reach 91.12%, the adsorption rate of cobalt is 0.79%, and the consumption of sodium thiosulfate is 22.69 kg/t;
(3) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the consumption is 15 resin bed volumes, and the desorption rate of the gold is 97.7 percent finally.
Example 12:
the difference between the embodiment and the embodiment 11 is only that the cobalt sulfate heptahydrate in the step (2) is replaced by nickel sulfate hexahydrate, other process parameters are completely consistent with the embodiment 11, the leaching rate of gold in the step (2) is 90.6%, the consumption of sodium thiosulfate is 21.52kg/t, the adsorption rate of resin to gold can reach 98.32%, the adsorption rate of nickel is 0.93%, and the maximum desorption rate of gold in the step (3) is 98.71%.
Example 13:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations are 0.015mol/L, 0.15mol/L and 0.30mol/L respectively, adding sodium hydroxide to adjust the pH value of the ore pulp to 10.0, and finally adding IRA-400 strong basic resin into the ore pulp to adsorb gold, wherein the dosage of the resin is 40 g/L; then leaching and adsorbing for 8.0h in air atmosphere at the temperature of 35 ℃ and the stirring speed of 300 r/min; after leaching and adsorption, the leaching rate of gold is 96.1 percent, the adsorption rate of gold on the gold-loaded resin can reach 92.48 percent, the adsorption rate of cobalt is 0.65 percent, and the consumption of sodium thiosulfate is 24.2 kg/t;
(3) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the consumption is 15 resin bed volumes, and the desorption rate of the gold finally obtained is 96.9 percent.
Example 14:
the difference between the embodiment and the embodiment 13 is only that the cobalt sulfate heptahydrate in the step (2) is replaced by nickel sulfate hexahydrate, other process parameters are completely consistent with the embodiment 13, the leaching rate of gold in the step (2) is 92.25%, the consumption of sodium thiosulfate is 23.94kg/t, the adsorption rate of resin to gold can reach 98.64%, the adsorption rate of nickel is 0.94%, and the maximum desorption rate of gold in the step (3) is 98.6%.
Example 15:
the invention relates to a method for extracting gold from thiosulfate, which comprises the following steps:
(1) finely grinding the sulfide type gold concentrate raw material to be-74 mu m accounting for 85 percent, and then adjusting the mass concentration of ore pulp to be 16.67 percent;
(2) sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp obtained in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are 0.05mol/L, 0.5mol/L and 0.50mol/L respectively, adding sodium hydroxide to adjust the pH value of the ore pulp to 10.0, and finally adding IRA-400 strong basic resin into the ore pulp to adsorb gold, wherein the dosage of the resin is 40 g/L; then leaching and adsorbing for 8.0h in air atmosphere at the temperature of 35 ℃ and the stirring speed of 300 r/min; after leaching and adsorption, the leaching rate of gold is 94.84%, the adsorption rate of gold on the gold-loaded resin can reach 90.18%, the adsorption rate of cobalt is 1.06%, and the consumption of sodium thiosulfate is 26.6 kg/t;
(3) loading the obtained gold-loaded resin into a column, wherein the inner diameter of the exchange column is 4mm, the height of a resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted2SO3And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to carry out dynamic desorption on gold, the flow rate of the desorbent is 3 resin bed volumes per hour, the dosage is 15 resin bed volumes, and the desorption rate of the gold is 97.54 percent finally.
Example 16:
the difference between the embodiment and the embodiment 15 is only that the cobalt sulfate heptahydrate in the step (2) is replaced by nickel sulfate hexahydrate, other process parameters are completely consistent with the embodiment 15, the leaching rate of gold in the step (2) is 90.14%, the consumption of sodium thiosulfate is 25.51kg/t, the adsorption rate of resin to gold can reach 97.92%, the adsorption rate of nickel is 0.74%, and the maximum resolution rate of gold in the step (3) is 98.33%.
Claims (10)
1. The method for extracting gold by using catalytic thiosulfate is characterized by comprising the following steps of:
(1) finely grinding the gold concentrate, and then mixing into ore pulp;
(2) adding glycine or glycine metal salt, cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate and thiosulfate into the ore pulp, and adjusting the pH value of the ore pulp to leach gold; adding resin into the leaching solution to adsorb gold to obtain gold-loaded resin;
(3) and desorbing gold from the gold-loaded resin by using a desorbent to obtain a gold-rich solution.
2. The method for extracting gold by using catalytic thiosulfate is characterized by comprising the following steps of:
(1) finely grinding the gold concentrate, and then mixing into ore pulp;
(2) adding glycine or glycine metal salt, cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate and thiosulfate into the ore pulp, adjusting the pH value of the ore pulp to carry out gold leaching, and adding resin to adsorb gold in the gold leaching process to obtain gold-loaded resin;
(3) and desorbing gold from the gold-loaded resin by using a desorbent to obtain a gold-rich solution.
3. The catalytic thiosulfate gold extraction method of claim 1 or 2, wherein in the step (2), the initial concentration of glycine or the metal salt of glycine is 0.05 to 0.5 mol/L;
the initial concentration of the cobalt sulfate heptahydrate or/and the nickel sulfate hexahydrate is 0.005-0.05 mol/L;
the initial concentration of thiosulfate is 0.1 to 1 mol/L.
4. The method for extracting gold by using thiosulfate as described in claim 1 or 2, characterized in that in the step (2), the pH of the ore pulp is adjusted to 9-11 by using sodium hydroxide.
5. The method for catalytic thiosulfate gold extraction according to claim 1 or 2, characterized in that in the step (2), the metal glycinate is at least one of sodium glycinate and calcium glycinate, and the thiosulfate is at least one of sodium thiosulfate and ammonium thiosulfate.
6. The method for extracting gold by using the catalytic thiosulfate as claimed in claim 1 or 2, wherein in the step (2), the gold leaching process is carried out in an air atmosphere, the gold leaching temperature is 0-50 ℃, the gold leaching time is 8.0-24.0 h, and the stirring speed is controlled at 100-400 r/min.
7. The catalytic thiosulfate gold extraction method according to claim 1 or 2, wherein in the step (3), the desorbent is a mixed solution of sodium sulfite and sodium chloride, the mixed solution is used in an amount of 10 to 30 resin bed volumes, and the flow rate is 2 to 6 resin bed volumes/hour; in the mixed solution of sodium sulfite and sodium chloride, the concentration of the sodium sulfite is 0.1-0.6 mol/L, and the concentration of the sodium chloride is 1-3 mol/L.
8. The method for catalytic thiosulfate gold extraction as claimed in claim 1 or 2, characterized in that in the step (1), the grain size of the gold concentrate after fine grinding-74 μm is more than 80%; the mass concentration of the ore pulp is 15-35%.
9. The method for extracting gold from thiosulfate through catalysis in claim 1, wherein in the step (2), the resin is strong-base anion exchange resin, the addition amount of the resin is 10-50 g/L, and the adsorption time of the resin is 0.5-1.5 h.
10. The method for extracting gold from thiosulfate by catalyzing as claimed in claim 2, wherein in the step (2), the resin is strong-base anion exchange resin, the adding amount of the resin is 10-50 g/L, and the adsorption time of the resin is 8.0-24 h.
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