CN114540635B - Method for extracting gold by catalyzing thiosulfate - Google Patents
Method for extracting gold by catalyzing thiosulfate Download PDFInfo
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- CN114540635B CN114540635B CN202210088686.9A CN202210088686A CN114540635B CN 114540635 B CN114540635 B CN 114540635B CN 202210088686 A CN202210088686 A CN 202210088686A CN 114540635 B CN114540635 B CN 114540635B
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- gold
- resin
- thiosulfate
- leaching
- ore pulp
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- 239000010931 gold Substances 0.000 title claims abstract description 246
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 242
- 238000000034 method Methods 0.000 title claims abstract description 62
- 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 141
- 229920005989 resin Polymers 0.000 claims abstract description 141
- 238000002386 leaching Methods 0.000 claims abstract description 87
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000004471 Glycine Substances 0.000 claims abstract description 43
- 239000012141 concentrate Substances 0.000 claims abstract description 40
- 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 35
- 239000003795 chemical substances by application Substances 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 19
- 229940116202 nickel sulfate hexahydrate Drugs 0.000 claims abstract description 19
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 150000003839 salts Chemical class 0.000 claims abstract description 13
- 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 48
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 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
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 17
- 239000011780 sodium chloride Substances 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 14
- 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
- 239000003513 alkali Substances 0.000 claims description 4
- 239000003957 anion exchange resin Substances 0.000 claims description 4
- 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
- 125000000101 thioether group Chemical group 0.000 claims 2
- 238000000605 extraction Methods 0.000 abstract description 11
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 abstract description 8
- 238000006555 catalytic reaction Methods 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- 239000002994 raw material Substances 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 18
- 238000003795 desorption Methods 0.000 description 17
- 239000010941 cobalt Substances 0.000 description 11
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 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
- 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
- 230000003197 catalytic effect Effects 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- -1 thiosulfate ions Chemical class 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 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
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-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
- 230000007613 environmental effect Effects 0.000 description 2
- MXZVHYUSLJAVOE-UHFFFAOYSA-N gold(3+);tricyanide Chemical compound [Au+3].N#[C-].N#[C-].N#[C-] MXZVHYUSLJAVOE-UHFFFAOYSA-N 0.000 description 2
- 231100000086 high toxicity Toxicity 0.000 description 2
- 150000002500 ions Chemical class 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
- DHMQDGOQFOQNFH-UHFFFAOYSA-M Aminoacetate Chemical compound NCC([O-])=O DHMQDGOQFOQNFH-UHFFFAOYSA-M 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
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 229910001429 cobalt ion Inorganic materials 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 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
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 210000003462 vein Anatomy 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
Abstract
A method for extracting gold by catalyzing thiosulfate, which comprises the following steps: (1) finely grinding gold concentrate and then blending 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 carry out gold leaching; then adding resin to adsorb gold to obtain gold-loaded resin; or adding resin to adsorb gold in the gold leaching process to obtain gold-carrying resin; (3) Desorbing gold from the gold-loaded resin by using a desorbing agent to obtain a gold-rich solution. Compared with copper-ammonia catalysis, the gold extraction process has better gold leaching rate, the leaching rate of the first-stage leached gold can reach more than 90%, and the leaching rate of the first-stage leached gold 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 gold extraction method, 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. Cyanide is extremely toxic, harmful to the environment, and has poor leaching effect on gold ores containing copper and carbon. Therefore, developing clean, nontoxic non-cyanide gold extraction technology is of great significance to the healthy development of the gold industry. The thiosulfate method is widely regarded as a non-cyanide gold extraction method which has the potential to replace the cyanide method, and has the advantages of environment-friendly and nontoxic reagent, low price, good selectivity to hardware, insensitivity to gold robbing carbon, high gold leaching rate, and the like, but the leaching rate of the thiosulfate method is very slow without a 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 consumption of leaching agent, environmental threat of ammonia and complex gold leaching recovery process, and seriously hinders industrial application and popularization. Copper-ammonia catalysisCu (NH) in leaching solution of chemical system 3 ) 4 2+ For S 2 O 3 2- The strong oxidation of (1-1) results in high leaching agent consumption. Although the ion exchange resin adsorption method is widely considered to be optimal for recovering gold from the leachate, cu (S 2 O 3 ) 3 5- And Au (S) 2 O 3 ) 2 3- The complex ions generate strong competitive adsorption on the surface of the resin, so that copper and gold must be desorbed before gold is desorbed when gold-loaded resin is desorbed, otherwise, the purity of gold desorption liquid is seriously affected. Therefore, gold recovery processes are complex, and the high volatility and high toxicity of ammonia also pose a major threat to the atmosphere and water. Accordingly, many researchers have recently conducted research into new catalytic systems in an effort to replace the conventional copper-ammonia catalytic systems.
2Cu(NH 3 ) 4 2+ +8S 2 O 3 2- ＝2Cu(S 2 O 3 ) 3 5- +8NH 3 +S 4 O 6 2- (1-1)。
While new catalytic systems are currently less investigated. Currently, there are studies: aiming at a carbonaceous sulfide-type gold ore which is specially used in Goldstrike mine and is pretreated by pressure oxidation, a NH-free gold ore is developed by Barrickgold company 3 Cu (I) -CaS of (C) 2 O 3 The leaching of the system achieves higher gold recovery, but the system still has Cu (S 2 O 3 ) 3 5- For Au (S) 2 O 3 ) 2 3- Adsorption on the resin surface is strongly competing. For the easily-immersed quartz vein type gold ore, researchers use Cu (II) -EDA to catalyze S 2 O 3 2– Leaching, prolonging the leaching time of the system, reaching the gold leaching rate equivalent to copper-ammonia catalysis, and S 2 O 3 2– The consumption of ethylene diamine is significantly reduced, but the ethylene diamine is high in toxicity and high in price, and the application of the ethylene diamine is limited. Also have researchers directed to Fe (III) -EDTA or Fe (III) -C 2 O 4 2– The process of catalyzing thiosulfate leaching gold is studied, but the iron-based catalyst bodyThe pH is strictly required, and the catalytic capability thereof requires the addition of thiourea which is possibly carcinogenic to increase the leaching rate of gold. For one silicate type and four sulfide type gold ores, there are researchers using Ni (II) -NH 3 Catalysis S 2 O 3 2– Leaching studies, results show that Ni (II) -NH 3 The catalysis can reach leaching Jin Nengli which is equivalent to copper-ammonia catalysis, the consumption of leaching agent is obviously reduced, and the recovery rate of gold in leaching liquid by a resin adsorption method is higher, but the system still needs to use ammonia which is not environment-friendly.
In summary, the existing new catalytic system can not completely solve the three problems of large consumption of leaching agent, environmental threat of ammonia and complex gold recovery process existing in the copper-ammonia catalytic thiosulfate method gold extraction.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings in the background art and provide a method for catalyzing thiosulfate to extract gold.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for catalyzing thiosulfate to extract gold, comprising the following steps:
(1) Finely grinding the gold concentrate, and then adjusting the gold concentrate 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 carry out gold leaching; then adding resin to adsorb gold to obtain gold-loaded resin;
(3) Desorbing gold from the gold-loaded resin by using a desorbing agent to obtain a gold-rich solution.
The invention also provides another method for catalyzing thiosulfate to extract gold, which comprises the following steps:
(1) Finely grinding the gold concentrate, and then adjusting the gold concentrate 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 of the ore pulp to perform gold leaching, and adding resin to adsorb gold in the gold leaching process to obtain gold-carrying resin;
(3) Desorbing gold from the gold-loaded resin by using a desorbing agent to obtain a gold-rich solution.
In the above method for catalyzing thiosulfate to extract gold, preferably, in the step (2), the initial concentration of glycine or 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 1mol/L.
In the above method for catalyzing thiosulfate to extract gold, preferably, in the step (2), sodium hydroxide is adopted to adjust the pH of the ore pulp to 9-11.
In the above method for catalyzing thiosulfate to extract gold, 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.
In the method for extracting gold by catalyzing 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 h, and the stirring rate is controlled to be 100-400 r/min.
In the above method for catalyzing thiosulfate to extract gold, 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 sodium sulfite and sodium chloride mixed solution, the concentration of sodium sulfite is 0.1-0.6 mol/L, and the concentration of sodium chloride is 1-3 mol/L.
In the method for extracting gold by catalyzing thiosulfate, preferably, in the step (1), the granularity of the finely ground gold concentrate-74 μm accounts for more than 80%, and the mass concentration of ore pulp is 15-35%.
In the above method for catalyzing thiosulfate to extract gold, preferably, in the step (2), the resin is a strong-alkali anion exchange resin (such as IRA-400, tulsion A-21S, etc.), the adding amount of the resin is 10-50 g/L, and the adsorption time of the added resin is 0.5-1.5 h.
In the above method for catalyzing thiosulfate to extract gold, preferably, in the step (2), the resin is a strong-alkali anion exchange resin (such as IRA-400, tulsion A-21S, etc.), the adding amount of the resin is 10-50 g/L, and the adsorption time of the added resin is 8.0-24 h.
Compared with the prior art, the invention has the advantages that:
(1) In the gold leaching process by catalyzing thiosulfate with 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 ions to generate a gold glycine thiosulfate complex with higher stability, so that direct contact between the thiosulfate ions and the gold surface is avoided, passivation of the gold surface by decomposition products of the thiosulfate ions is eliminated, and the leaching rate of gold in thiosulfate solution is remarkably improved. Compared with copper-ammonia catalysis, the gold extraction process has better gold leaching rate, the leaching rate of the first-stage leached gold can reach more than 90%, and the leaching rate of the first-stage leached gold can only reach about 83%.
(2) In the process of leaching gold by catalyzing thiosulfate with cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate, glycine or glycine metal salt, the glycine or glycine metal salt can form a relatively stable complex with cobalt/nickel ions, so that the transition metal ion pair S is weakened 2 O 3 2- The consumption of thiosulfate is obviously reduced to 20-30 kg/t (namely, 20-30 kg thiosulfate is consumed per ton of gold concentrate), compared with the traditional Cu-NH 3 -S 2 O 3 2- In the system, cu (NH) 3 ) 4 2+ For S 2 O 3 2- The strong oxidation of (2) results in a thiosulfate leaching agent consumption of about 50kg/t, and a large leaching agent consumption.
(3) In the process of leaching gold by catalyzing thiosulfate with cobalt sulfate heptahydrate or/and nickel sulfate hexahydrate, glycine or glycine metal salt, cobalt/nickel complex ions mainly exist in a cationic form and are exchanged with strong alkaline anionsThe affinity of the resin is very weak, so cobalt/nickel is not basically adsorbed on the surface of the resin, therefore, the gold-carrying resin obtained by the system only needs one section of desorption, and the recovery process of gold in the leaching liquid is simpler, compared with the traditional Cu-NH 3 -S 2 O 3 2- In the system, cu (S) 2 O 3 ) 3 5– And Au (S) 2 O 3 ) 2 3– Ligand species, similarity of electronic structure, cu (S 2 O 3 ) 3 5– For Au (S) 2 O 3 ) 2 3– Adsorption on the resin surface is strongly competing, resulting in a complicated gold recovery process.
(4) In the gold extraction process of the invention, S 2 O 3 2- Is significantly reduced in its oxidative decomposition products such as SO 3 2- 、S x O 6 2- The concentration of the leaching solution is correspondingly reduced, the components of the leaching solution are simpler, and the recycling of the leaching solution is facilitated.
(5) In the gold extraction process, glycine which is not easy to volatilize and nontoxic is used for replacing 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
The invention will be described more fully hereinafter with reference to the preferred embodiments for the purpose of facilitating an understanding of the invention, but the scope of the invention is not limited to the specific embodiments described below.
Unless defined otherwise, all technical and scientific terms 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 be limiting of the scope of the present invention.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The raw materials used in the following examples and comparative examples were sulfide type gold concentrates, the main phases of which were pyrite and silica, the gold grade was 48g/t, and gold was mainly present in the form of single gold+continuously grown gold, and the chemical phase analyses thereof are 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 sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Firstly adding ammonia water to the ore pulp in the step (1) until the concentration is 1mol/L, regulating the pH value to 9.8 by sulfuric acid, sequentially adding copper sulfate pentahydrate and sodium thiosulfate pentahydrate to the ore pulp until the concentration is 0.015mol/L and 0.3mol/L respectively, and regulating the pH value to 10.0 by sodium hydroxide; leaching for 8.0h in an air atmosphere at 35 ℃ and a 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 per ton of gold concentrate);
(3) Adding IRA-400 strong alkaline resin to 50mL of the ore pulp leaching solution obtained in the step (2), wherein the resin consumption 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-carrying resin can reach 83.47% after the adsorption is finished, and the adsorption rate of copper is 31.33%;
(4) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L (NH) 4 ) 2 S 2 O 3 The solution flows through the resin column from top to bottom to dynamically desorb copper, and then 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the obtained copper resolution is 95.1% and the gold desorption rate is 96.13%.
Example 1:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp 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 be 10.0; then leaching for 8.0h in air atmosphere at 50 ℃ and at a stirring speed of 300r/min, wherein the leaching rate of the final gold is 94.4%, and the consumption of sodium thiosulfate is 21.53kg/t (namely, 21.53kg of sodium thiosulfate is consumed per ton of gold concentrate);
(3) Adding IRA-400 strong alkaline resin to 50mL of the ore pulp leaching solution obtained in the step (2), wherein the resin consumption 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-carrying resin can reach 89.96% after the adsorption is finished, and the adsorption rate of cobalt is 1.07%;
(4) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 97.21%.
Example 2:
the difference between this example and example 1 is that only cobalt sulfate heptahydrate in step (2) is changed to nickel sulfate hexahydrate, other process parameters are completely the same as those of example 1, in step (2), the leaching rate of gold is 89.41%, the consumption of sodium thiosulfate is 22.7kg/t, in step (3), the adsorption rate of resin to gold can reach 97.66%, the adsorption rate of nickel is 0.81%, and in step (4), the maximum desorption rate of gold is 98.4%.
Example 3:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp 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 be 10.0; then leaching for 8.0h in air atmosphere at 50 ℃ and stirring speed of 300r/min, wherein the leaching rate of the final gold is 95.86%, and the consumption of sodium thiosulfate is 23.4kg/t;
(3) Adding IRA-400 strong alkaline resin to 50mL of the ore pulp leaching solution obtained in the step (2), wherein the resin consumption 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-carrying resin can reach 89.84% after the adsorption is finished, and the adsorption rate of cobalt is 0.85%;
(4) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 97.58%.
Example 4:
the difference between this example and example 3 is that only cobalt sulfate heptahydrate in step (2) is changed to nickel sulfate hexahydrate, other process parameters are completely consistent with those of example 3, in step (2), the leaching rate of gold is 91.46%, the consumption of sodium thiosulfate is 23.14kg/t, in step (3), the adsorption rate of resin to gold can reach 98.2%, the adsorption rate of nickel is 0.94%, and in step (4), the maximum desorption rate of gold is 97.93%.
Example 5:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp 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 be 10.0; then leaching for 8.0h in air atmosphere at 50 ℃ and stirring speed of 300r/min, wherein the leaching rate of the final gold is 96.12%, and the consumption of sodium thiosulfate is 25.26kg/t;
(3) Adding IRA-400 strong alkaline resin into 50mL of the ore pulp leaching solution obtained in the step (2) to adsorb gold, wherein the resin consumption is 2g, the stirring speed in the adsorption process is 150r/min, the adsorption time is 1h, the adsorption rate of the gold-carrying resin to gold can reach 91.24% after the adsorption is finished, and the adsorption rate of cobalt is 0.98%;
(4) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 97.7%.
Example 6:
the difference between this example and example 5 is that cobalt sulfate heptahydrate in step (2) is replaced by nickel sulfate hexahydrate, other process parameters are completely the same as those of example 5, in step (2), the leaching rate of gold is 91.88%, the consumption of sodium thiosulfate is 23.97kg/t, in step (3), the adsorption rate of resin to gold can reach 98.42%, the adsorption rate of nickel is 0.88%, and in step (4), the maximum analysis rate of gold is 98.34%.
Example 7:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp 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 air atmosphere at 50 ℃ and stirring speed of 300r/min, wherein the leaching rate of the final gold is 90.62%, and the consumption of sodium thiosulfate is 21.8kg/t;
(3) Adding IRA-400 strong alkaline resin to 50mL of the ore pulp leaching solution obtained in the step (2), wherein the resin consumption 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-carrying resin can reach 88.72% after the adsorption is finished, and the adsorption rate of cobalt is 0.89%;
(4) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 98.01%.
Example 8:
the difference between this example and example 7 is that only cobalt sulfate heptahydrate in step (2) is changed to nickel sulfate hexahydrate, other process parameters are completely the same as those of example 7, in step (2), the leaching rate of gold is 87.6%, the consumption of sodium thiosulfate is 20.41kg/t, in step (3), the adsorption rate of resin to gold can reach 97.84%, the adsorption rate of nickel is 1.02%, and in step (4), the maximum resolution rate of gold is 97.78%.
Example 9:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp 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 air atmosphere at 50 ℃ and stirring speed of 300r/min, wherein the leaching rate of the final gold is 91.15%, and the consumption of sodium thiosulfate is 25.55kg/t;
(3) Adding IRA-400 strong alkaline resin to 50mL of the ore pulp leaching solution obtained in the step (2), wherein the resin consumption 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-carrying resin can reach 90.4% after the adsorption is finished, and the adsorption rate of cobalt is 1.21%;
(4) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 97.4%.
Example 10:
the difference between this example and example 9 is that cobalt sulfate heptahydrate in step (2) is replaced by nickel sulfate hexahydrate, other process parameters are completely the same as those of example 9, in step (2), gold leaching rate is 88.31%, sodium thiosulfate consumption is 26.13kg/t, in step (3), adsorption rate of resin to gold can reach 98.37%, adsorption rate of nickel is 0.93%, and in step (4), maximum desorption rate of gold is 98.14%.
Comparative example 2:
the gold extraction method of the comparative example comprises the following steps:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Firstly adding ammonia water to the ore pulp in the step (1) until the concentration is 1mol/L, regulating the pH value to 9.8 by sulfuric acid, sequentially adding copper sulfate pentahydrate and sodium thiosulfate pentahydrate to the ore pulp until the concentration is 0.015mol/L and 0.3mol/L respectively, regulating the pH value to 10.0 by sodium hydroxide, and finally adding IRA-400 strong alkaline resin to the ore pulp to adsorb gold, wherein the resin consumption is 40g/L; then leaching and adsorbing for 8.0h in an 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 gold-carrying resin can reach 84.66%, the adsorption rate of copper is 34.8%, and the consumption of sodium thiosulfate is 53.4kg/t;
(3) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, and the resin bedThe volume is 10mL, 0.5mol/L (NH) 4 ) 2 S 2 O 3 The solution flows through the resin column from top to bottom to dynamically desorb copper, and then 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the resolution ratio of copper is 95.62% and the desorption ratio of gold is 95.89%.
Example 11:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp 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 value of the ore pulp to be 10.0, and finally adding IRA-400 strong alkaline resin to adsorb gold, wherein the resin consumption is 40g/L; then leaching and adsorbing for 8.0h in an 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 gold-carrying resin can reach 91.12%, the adsorption rate of cobalt is 0.79%, and the consumption of sodium thiosulfate is 22.69kg/t;
(3) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 97.7%.
Example 12:
the difference between this example and example 11 is that only cobalt sulfate heptahydrate in step (2) is changed to nickel sulfate hexahydrate, other process parameters are completely the same as those of example 11, in step (2), the leaching rate of gold 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 in step (3), the maximum desorption rate of gold is 98.71%.
Example 13:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are respectively 0.015mol/L, 0.15mol/L and 0.30mol/L, adding sodium hydroxide to adjust the pH value of the ore pulp to be 10.0, and finally adding IRA-400 strong alkaline resin to adsorb gold, wherein the resin consumption is 40g/L; then leaching and adsorbing for 8.0h in an 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%, the adsorption rate of gold on gold-carrying resin can reach 92.48%, the adsorption rate of cobalt is 0.65%, and the consumption of sodium thiosulfate is 24.2kg/t;
(3) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 96.9%.
Example 14:
the difference between this example and example 13 is that only cobalt sulfate heptahydrate in step (2) is changed to nickel sulfate hexahydrate, other process parameters are completely the same as those of example 13, in step (2), the leaching rate of gold 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 in step (3), the maximum desorption rate of gold is 98.6%.
Example 15:
the method for extracting gold by catalyzing thiosulfate comprises the following steps of:
(1) Finely grinding sulfide type gold concentrate raw materials until the sulfide type gold concentrate raw materials are 85% in diameter of-74 mu m, and then adjusting the mass concentration of ore pulp to be 16.67%;
(2) Sequentially adding cobalt sulfate heptahydrate, glycine and sodium thiosulfate pentahydrate into the ore pulp in the step (1) until the concentrations of the cobalt sulfate heptahydrate, the glycine and the sodium thiosulfate pentahydrate are respectively 0.05mol/L, 0.5mol/L and 0.50mol/L, adding sodium hydroxide to adjust the pH value of the ore pulp to be 10.0, and finally adding IRA-400 strong alkaline resin to adsorb gold, wherein the resin consumption is 40g/L; then leaching and adsorbing for 8.0h in an 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 gold-carrying resin can reach 90.18%, the adsorption rate of cobalt is 1.06%, and the consumption of sodium thiosulfate is 26.6kg/t;
(3) Loading the obtained gold-loaded resin into column, wherein the inner diameter of the exchange column is 4mm, the height of the resin bed is 80cm, the volume of the resin bed is 10mL, and 0.5mol/L Na is adopted 2 SO 3 And 2.0mol/L NaCl mixed solution flows through the resin column from top to bottom to dynamically desorb gold, the flow rate of desorbing agent is 3 volumes/hour of resin beds, the dosage is 15 volumes of resin beds, and finally the desorption rate of gold is 97.54%.
Example 16:
the difference between this example and example 15 is that only cobalt sulfate heptahydrate in step (2) is changed to nickel sulfate hexahydrate, other process parameters are completely the same as those of example 15, in step (2), the leaching rate of gold 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 in step (3), the maximum resolution rate of gold is 98.33%.
Claims (7)
1. A method for catalyzing thiosulfate to extract gold, which is characterized by comprising the following steps:
(1) Finely grinding the gold concentrate, and then adjusting the gold concentrate into ore pulp; the gold concentrate is sulfide type gold concentrate; the granularity of the finely ground gold concentrate is-74 mu m accounting for more than 80 percent; the mass concentration of the ore pulp is 15-35%;
(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 9-11 by adopting sodium hydroxide to carry out gold leaching; then adding resin to adsorb gold to obtain gold-loaded resin; wherein the initial concentration of glycine or 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 0.1-1 mol/L;
(3) Desorbing gold from the gold-loaded resin by using a desorbing agent to obtain a gold-rich solution.
2. A method for catalyzing thiosulfate to extract gold, which is characterized by comprising the following steps:
(1) Finely grinding the gold concentrate, and then adjusting the gold concentrate into ore pulp; the gold concentrate is sulfide type gold concentrate; the granularity of the finely ground gold concentrate is-74 mu m accounting for more than 80 percent; the mass concentration of the ore pulp is 15-35%;
(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 9-11 by adopting sodium hydroxide to perform gold leaching, and adding resin to adsorb gold in the gold leaching process to obtain gold-carrying resin; wherein the initial concentration of glycine or 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 0.1-1 mol/L;
(3) Desorbing gold from the gold-loaded resin by using a desorbing agent to obtain a gold-rich solution.
3. The method for catalyzing and extracting gold by thiosulfate according to claim 1 or 2, wherein in the step (2), the glycine metal salt is at least one of sodium glycinate and calcium glycinate, and the thiosulfate is at least one of sodium thiosulfate and ammonium thiosulfate.
4. The method for catalyzing thiosulfate to extract gold according to claim 1 or 2, wherein in the step (2), the gold leaching process is performed in an air atmosphere, the gold leaching temperature is 0-50 ℃, the gold leaching time is 8.0-24.0 h, and the stirring rate is controlled to be 100-400 r/min.
5. The method for catalyzing thiosulfate to extract gold according to claim 1 or 2, wherein in the step (3), the desorbent is a mixed solution of sodium sulfite and sodium chloride, the amount 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 sodium sulfite and sodium chloride mixed solution, the concentration of sodium sulfite is 0.1-0.6 mol/L, and the concentration of sodium chloride is 1-3 mol/L.
6. The method for catalyzing and extracting gold by thiosulfate as set forth in claim 1, wherein in the step (2), the resin is a strong-alkali anion exchange resin, the addition amount of the resin is 10-50 g/L, and the adsorption time of the added resin is 0.5-1.5 h.
7. The method for catalyzing thiosulfate to extract gold according to claim 2, wherein in the step (2), the resin is a strong-alkali anion exchange resin, the adding amount of the resin is 10-50 g/L, and the adsorption time of the added resin is 8.0-24 h.
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