CN115725851A - Gold ore dump leaching slag in-situ treatment method - Google Patents
Gold ore dump leaching slag in-situ treatment method Download PDFInfo
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- CN115725851A CN115725851A CN202211532157.XA CN202211532157A CN115725851A CN 115725851 A CN115725851 A CN 115725851A CN 202211532157 A CN202211532157 A CN 202211532157A CN 115725851 A CN115725851 A CN 115725851A
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- 238000002386 leaching Methods 0.000 title claims abstract description 161
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 63
- 239000010931 gold Substances 0.000 title claims abstract description 63
- 239000002893 slag Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 21
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000000813 microbial effect Effects 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000007800 oxidant agent Substances 0.000 claims abstract description 10
- 239000007791 liquid phase Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims description 34
- 230000003647 oxidation Effects 0.000 claims description 25
- 238000007254 oxidation reaction Methods 0.000 claims description 25
- 238000009423 ventilation Methods 0.000 claims description 19
- 230000008719 thickening Effects 0.000 claims description 17
- 239000010802 sludge Substances 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 14
- 239000003344 environmental pollutant Substances 0.000 claims description 11
- 231100000719 pollutant Toxicity 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- 239000003153 chemical reaction reagent Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000706 filtrate Substances 0.000 claims description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 7
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 5
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- 229920006814 PVC, UPVC Polymers 0.000 claims description 4
- 241000589516 Pseudomonas Species 0.000 claims description 4
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 4
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 4
- VTIIJXUACCWYHX-UHFFFAOYSA-L disodium;carboxylatooxy carbonate Chemical compound [Na+].[Na+].[O-]C(=O)OOC([O-])=O VTIIJXUACCWYHX-UHFFFAOYSA-L 0.000 claims description 4
- 239000011790 ferrous sulphate Substances 0.000 claims description 4
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
- 229940001584 sodium metabisulfite Drugs 0.000 claims description 4
- 235000010262 sodium metabisulphite Nutrition 0.000 claims description 4
- 229940045872 sodium percarbonate Drugs 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 4
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 4
- 229960001763 zinc sulfate Drugs 0.000 claims description 4
- 241000192125 Firmicutes Species 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 239000002920 hazardous waste Substances 0.000 claims description 2
- 241000192142 Proteobacteria Species 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 11
- 229910052785 arsenic Inorganic materials 0.000 abstract description 9
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 abstract description 9
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 abstract description 8
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 abstract description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 6
- -1 sulfate radical Chemical class 0.000 abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000460 chlorine Substances 0.000 abstract description 3
- 229910052801 chlorine Inorganic materials 0.000 abstract description 3
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 85
- 239000003795 chemical substances by application Substances 0.000 description 19
- 239000000126 substance Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 241001135756 Alphaproteobacteria Species 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000000515 cyanogenic effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of solid waste treatment methods, and particularly relates to an in-situ treatment method of gold ore dump leaching slag; the existing leaching and collecting pipelines are utilized, oxidizing agent solution is leached in situ under the alkaline condition, cyanide reducing agents are combined with microbial communities to comprehensively treat cyanide, thiocyanate, ammonia nitrogen, heavy metal, arsenic, sulfate radical, chlorine, nitrate radical, nitrite radical and the like in the leaching solution, the treated liquid phase is circularly prepared into alkaline oxidizing agent solution, and slag produced in the treatment process is sold to smelting enterprises for resource recovery.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment methods, and particularly relates to an in-situ treatment method for gold ore dump leaching slag.
Background
The heap leaching process is a common leaching technology in the gold industry, and heap leaching residues generated after heap closure of the technology have great influence on the environment, wherein the main influence comprises underground water pollution, soil pollution, surface water pollution and the like, and the pollution factors are various and comprise cyanide, thiocyanate, ammonia nitrogen, heavy metal, arsenic and the like. At present, the in-situ treatment method aiming at gold ore heap leaching residue is less, a natural degradation method and the like are generally adopted, the treatment period is long, the treatment capacity is limited, and pollution factors such as cyanide, thiocyanate, ammonia nitrogen, heavy metal, arsenic and the like cannot be treated at the same time.
Disclosure of Invention
In order to overcome the problems, the invention provides an in-situ treatment method of gold ore dump leaching slag, which utilizes the existing leaching and collecting pipelines, adopts oxidizing agent solution to carry out in-situ leaching under alkaline conditions, then adopts cyanogen reducing agent to combine with microbial community to comprehensively treat cyanide, thiocyanate, ammonia nitrogen, heavy metal, arsenic, sulfate radical, chlorine, nitrate radical, nitrite radical and the like in the leaching solution, the treated liquid phase is circularly prepared into alkaline oxidizing agent solution, and the slag produced in the treatment process is sold to smelting enterprises for resource recovery.
An in-situ treatment method for gold ore dump leaching slag comprises the following specific steps:
step 1, uniformly arranging ventilation pipelines in gold ore dump leaching slag 1 to be treated;
step 2, preparing alkaline oxidizing agent solution, carrying out in-situ leaching treatment on the gold ore heap leaching residues 1 through an original leaching pipeline of the gold ore heap leaching field, and simultaneously introducing air into the gold ore heap leaching residues 1 by using a fan and a ventilation pipeline; obtaining a leaching solution 1 and treated gold ore heap leaching slag, wherein the treated gold ore heap leaching slag is marked as gold ore heap leaching slag 2;
step 3, adding a cyanogen reducing agent into the leaching solution 1 to generate a leaching solution 2;
step 4, enabling the leaching solution 2 to enter a thickener for thickening to generate a thickening overflow and a thickening underflow, wherein the thickening overflow is marked as a leaching solution 3;
step 5, the thick underflow enters a filtering device for filtering to generate filtrate and filtering slag; mixing the filtrate with the leaching solution 3 to form a leaching solution 4, and delivering filter residues which are hazardous wastes to qualified units for treatment;
and 6, treating the leaching solution 4 or the diluted leaching solution 4 by using a cultured and amplified microbial community to obtain a leaching solution 5 and activated sludge, wherein the leaching solution 5 is used as the preparation water of the alkaline oxidation reagent solution used in the step 2 and is circularly used for leaching the gold ore heap leaching residue 1, and the activated sludge is directly used as a gold-containing material and is conveyed to a smelting enterprise to recover valuable elements therein.
In the step 1, the ventilation pipeline is made of PP, PVC, UPVC, stainless steel 304L, stainless steel 316 and stainless steel 316L, the depth of the ventilation pipeline is the same as that of the original leaching pipeline and collecting pipeline of the gold mine heap leaching field, and the pipe diameter of the ventilation pipeline is not larger than that of the original leaching pipeline and collecting pipeline of the gold mine heap leaching field.
And 2, adjusting the pH value of the alkaline oxidation agent solution to be between 7 and 9, wherein the alkaline oxidation agent solution in the step 2 is sodium metabisulfite solution, sodium hypochlorite solution, sodium sulfite solution, sodium percarbonate solution and hydrogen peroxide solution, and the mass concentration of the alkaline oxidation agent solution is between 0.5 and 5 percent.
The time of in-situ leaching treatment in the step 2 is 10 to 30 days, the dosage of the alkaline oxidation reagent solution is between 0.1 and 0.2 times of the weight of the heap leaching residue 1 every day, and the volume of the introduced air is between 100 and 10000 times of the volume of the alkaline oxidation reagent solution.
In the step 3, the cyanogen reducing agent is one or a mixture of ferrous sulfate, ferric sulfate, polymeric ferric sulfate, copper sulfate and zinc sulfate, and the cyanogen reducing agent is added until no new precipitate is generated in the liquid phase.
In the step 6, the microbial community put into the leaching solution 4 or the diluted leaching solution 4 is one or two of pseudomonas in a proteobacteria flora and bacillus in a firmicutes flora, the concentration of the bacterial suspension of the functional strains in the microbial community is enabled to be more than or equal to 10000 strains/mL after cultivation, meanwhile, the concentration of total cyanide in the leaching solution 4 or the diluted leaching solution 4 is controlled not to be higher than 50mg/L, and the concentrations of other pollutants are respectively controlled not to be higher than 10mg/L.
The invention has the beneficial effects that:
the method has high treatment efficiency, strong adaptability to the concentration of pollutants in the heap leaching residues and wide application range, can simultaneously treat pollution factors of cyanide, thiocyanate, ammonia nitrogen, heavy metals, arsenic, sulfate radicals, chlorine, nitrate radicals and nitrite radicals, can recover valuable elements such as precious metals and the like in the heap leaching residues, and is a good in-situ treatment method of gold heap leaching residues. The heap leaching slag treated by the method meets the requirement of treatment of a cyanogen slag tailing pond in 'gold industry cyanogen slag pollution control technical specification', the environmental risk caused by the heap leaching slag is greatly reduced, the treated liquid phase is recycled, no waste water is discharged, a certain amount of valuable substances such as gold and the like are contained in activated sludge generated by treating the leaching solution by a microbial community, and the activated sludge is recovered, so that certain economic benefit is achieved.
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
Example 1
An in-situ treatment method for gold ore dump leaching slag comprises the following specific steps:
step 1, marking original gold ore heap leaching slag to be treated as gold ore heap leaching slag 1, constructing an anti-seepage and blocking measure, a leaching pipeline and a collecting pipeline in a matching way when an existing gold ore heap leaching field is constructed, leaching the gold ore heap leaching slag 1 by adopting a cyanide-containing liquid circulation, preventing leached valuable substances from leaking by the blocking measure, and leaching and collecting the valuable substances of the gold ore heap leaching slag 1 by the leaching pipeline and the collecting pipeline; uniformly arranging ventilation pipelines in the gold ore dump leaching slag 1 to be treated;
step 2, preparing alkaline oxidizing agent solution, carrying out in-situ leaching treatment on the gold ore heap leaching residue 1 through an original leaching pipeline of the gold ore heap leaching field, and simultaneously introducing air into the gold ore heap leaching residue 1 by using a fan and a ventilation pipeline; obtaining leaching solution 1 and treated gold ore heap leaching slag, marking the treated gold ore heap leaching slag as gold ore heap leaching slag 2, and purifying the gold ore heap leaching slag 1;
step 3, adding a cyanogen reducing agent into the leaching solution 1 to generate a leaching solution 2, wherein the leaching solution 2 contains a certain amount of precipitate;
step 4, enabling the leaching solution 2 to enter a thickener for thickening to generate a thickening overflow and a thickening underflow, wherein the thickening overflow is marked as a leaching solution 3;
step 5, the dense bottom flow enters a filtering device for filtering to generate filtrate and filtering slag; mixing the filtrate with the leaching solution 3 to form leaching solution 4, and delivering the filtered residue as dangerous waste to a qualified unit for treatment;
and 6, treating the leaching solution 4 or the diluted leaching solution 4 by adopting a cultured and amplified microbial community to obtain a leaching solution 5 and activated sludge, wherein the leaching solution 5 is used as preparation water of the alkaline oxidation agent solution used in the step 2 and is circularly used for leaching the gold ore heap leaching residue 1, and the activated sludge is directly used as a gold-containing material and is conveyed to a smelting enterprise to recover valuable elements in the gold-containing material.
In the step 1, the ventilation pipeline is made of PP, PVC, UPVC, stainless steel 304L, stainless steel 316 and stainless steel 316L, the depth of the ventilation pipeline is the same as that of the original leaching pipeline and collecting pipeline of the gold mine heap leaching field, and the diameter of the ventilation pipeline is not larger than that of the original leaching pipeline and collecting pipeline of the gold mine heap leaching field.
The alkaline oxidation reagent solution in the step 2 comprises a sodium metabisulfite solution, a sodium hypochlorite solution, a sodium sulfite solution, a sodium percarbonate solution and a hydrogen peroxide solution, the pH value of the alkaline oxidation reagent solution is adjusted to be between 7 and 9, and the mass concentration of the alkaline oxidation reagent solution is between 0.5 and 5 percent.
And (3) if the alkaline oxidation agent solution in the step (2) is acidic, adjusting the pH value of the alkaline oxidation agent solution to be between 7 and 9 by using an alkaline agent, wherein the alkaline agent comprises sodium hydroxide and lime.
The time of the in-situ leaching treatment in the step 2 is 10-30 days, the dosage of the alkaline oxidation medicament solution is 0.1-0.2 times of the weight of the heap leaching residue 1 every day, and the volume of the introduced air is 100-10000 times of the volume of the alkaline oxidation medicament solution. The main reaction principle of the leaching process is as follows: (1) the alkaline oxidation agent solution has oxidation-reduction reaction with cyanide and thiocyanate under the alkaline and aerobic conditions, so that the content of the cyanide and the thiocyanate is reduced. (2) The alkaline oxidation agent solution conveys cyanide, heavy metal and the like to a subsequent microbial community treatment section through a collection pipeline.
In the step 2, the main pollutant content in the gold ore dump leaching slag 2 meets the requirement of the treatment of a cyanogen slag tailing pond in the technical Specification for pollution control of cyanogen slag in the gold industry.
In the step 3, the cyanogen reducing agent is ferric salt, cupric salt and zinc salt, specifically one or more of ferrous sulfate, ferric sulfate, polymeric ferric sulfate, copper sulfate and zinc sulfate, and the amount of the cyanogen reducing agent is added until no new precipitate is generated in the liquid phase. The reaction principle for removing a part of the complex cyanide is that the cyanogenic reducing agent is combined with the complex cyanide to generate a substance which is insoluble in water or insoluble in water.
In the step 4, the retention time of the leaching solution 2 entering the thickener is between 1 and 3 hours, and the concentration of the thickened underflow is between 10 and 30 percent.
And the filtering equipment in the step 5 comprises a plate-and-frame filter press and a bag filter.
The microbial community put into the leaching solution 4 or the diluted leaching solution 4 in the step 6 is one or two of Pseudomonas (Pseudomonas) in a proteobacteria flora and Bacillus (Bacillus) in a firmicutes flora, the concentration of the suspension of the functional strains in the microbial community is more than or equal to 10000 strains/mL after cultivation, meanwhile, the total cyanide concentration in the leaching solution 4 or the diluted leaching solution 4 is controlled not to be higher than 50mg/L, and the concentrations of other pollutants such as heavy metal, arsenic and the like are respectively not higher than 10mg/L.
The reaction principle is as follows: (1) the biological method of microbial community is utilized to treat cyanide, thiocyanate, nitrate, nitrite, sulfate and ammonia nitrogen pollutants. (2) The method is characterized in that cyanide, heavy metal and arsenic pollutants in a liquid phase are purified by utilizing the physical and chemical adsorption effect of microbial community sludge, and the obtained sludge contains valuable substances such as gold, silver and the like with high content and can be comprehensively recycled and sold.
Example 2
An in-situ treatment method of gold ore dump leaching slag comprises the following steps:
(1) The existing anti-seepage and blocking measures, leaching pipelines and collecting pipelines of the heap leaching residues 1 are utilized, and ventilation pipelines are uniformly arranged on the heap leaching residues 1. The material of the ventilation pipeline is PP, PVC, UPVC, stainless steel 304L, stainless steel 316L and the like, the depth of the ventilation pipeline is equivalent to that of the eluviation pipeline and the collection pipeline, and the pipe diameter of the ventilation pipeline is not larger than that of the eluviation pipeline and the collection pipeline.
(2) Preparing alkaline oxidation agent solution to carry out in-situ leaching treatment on the gold ore heap leaching residue 1, and simultaneously introducing air into the heap leaching residue 1 by using a fan. The pH value of the alkaline oxidation agent solution is between 7 and 9, the alkaline oxidation agent solution comprises but is not limited to sodium metabisulfite solution, sodium hypochlorite solution, sodium sulfite solution, sodium percarbonate solution, hydrogen peroxide solution and the like, if the agent solution is acidic, the pH value needs to be adjusted to be between 7 and 9 by an alkaline agent, the alkaline agent comprises but is not limited to sodium hydroxide, lime and the like, the preparation concentration of the alkaline oxidation agent is between 0.5 and 5 percent, the leaching time is between 10 and 30 days, the dosage of the heap-washing agent per day is between 0.1 and 0.2 times of the weight of the heap-leaching slag heap, and the air amount is between 100 and 10000 times of the dosage of the agent.
(3) Obtaining a leaching solution 1 and treated dump leaching slag 2, wherein the content of main pollutants in the dump leaching slag 2 meets the requirement of treating a cyanogen slag tailing pond in the gold industry cyanogen slag pollution control technical Specification.
(4) Adding cyanogen reducing agent into the leaching solution 1 to generate a precipitate substance to obtain a leaching solution 2. The cyanogen reducing agent comprises ferrous sulfate, ferric sulfate, polymeric ferric sulfate, copper sulfate, zinc sulfate and the like and mixtures thereof, and is added until no new precipitate is formed in the liquid phase. The reaction principle for removing a part of the complex cyanide is that the cyanogenic reducing agent is combined with the complex cyanide to generate a substance which is insoluble in water or insoluble in water.
(5) The leaching solution 2 enters a thickener for thickening to generate a leaching solution 3 (namely, a thickening overflow) and a thickening underflow. The residence time of the thickening is between 1 and 3 hours, and the concentration of the thickening underflow is between 10 and 30 percent.
(6) The dense bottom flow enters a filtering device for filtering to generate filtrate and filtering slag; mixing the filtrate with the leaching solution 3 to form leaching solution 4, and treating the filtered residue as dangerous waste by a qualified unit. Filtration equipment includes, but is not limited to, plate and frame filter presses, bag filters, and the like.
(7) Treating the leaching solution 4 or the diluted leaching solution 4 by adopting a cultured and amplified microbial community to obtain a leaching solution 5 and activated sludge, wherein the leaching solution 5 is used as the preparation water of the alkaline oxidation reagent solution to be circularly used for leaching the heap leaching residue 1, and the activated sludge is directly used as a gold-containing material and is conveyed to a smelting enterprise to recover valuable elements therein.
The concentration of pollutants in the leaching solution 4 or the diluted leaching solution 4 is controlled to have certain requirements, the concentration of total cyanides is not higher than 50mg/L, the concentrations of pollutants such as other heavy metals and arsenic are not higher than 10mg/L respectively, the other heavy metals include but are not limited to copper, lead, zinc, silver, gold and the like, and the treated leachate 5 effluent is used for circularly leaching alkaline oxidation liquid preparation or dilution water after meeting the first-level standard requirements of the integrated wastewater discharge standard. The method is characterized in that pollutants such as cyanide, heavy metal and arsenic in the liquid phase are purified by utilizing the physical and chemical adsorption effect of microbial community sludge, the obtained sludge contains valuable substances such as gold and silver with high content, and the sludge can be comprehensively recycled and sold.
Although the preferred embodiments of the present invention have been described in detail, the scope of the present invention should not be limited to the details of the embodiments, and any simple modifications within the technical scope of the present invention, which is equivalent or changed by a person skilled in the art within the technical scope of the present invention and the technical solution of the present invention and the inventive concept thereof, are included in the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. An in-situ treatment method for gold ore dump leaching slag is characterized by comprising the following specific steps:
step 1, uniformly arranging ventilation pipelines in gold ore dump leaching slag 1 to be treated;
step 2, preparing alkaline oxidizing agent solution, carrying out in-situ leaching treatment on the gold ore heap leaching residues 1 through an original leaching pipeline of the gold ore heap leaching field, and simultaneously introducing air into the gold ore heap leaching residues 1 by using a fan and a ventilation pipeline; obtaining leaching solution 1 and treated gold ore heap leaching slag, and marking the treated gold ore heap leaching slag as gold ore heap leaching slag 2;
step 3, adding a cyanogen reducing agent into the leaching solution 1 to generate a leaching solution 2;
step 4, enabling the leaching solution 2 to enter a thickener for thickening to generate a thickening overflow and a thickening underflow, wherein the thickening overflow is marked as a leaching solution 3;
step 5, the thick underflow enters a filtering device for filtering to generate filtrate and filtering slag; mixing the filtrate with the leaching solution 3 to form a leaching solution 4, and delivering filter residues which are hazardous wastes to qualified units for treatment;
and 6, treating the leaching solution 4 or the diluted leaching solution 4 by using a cultured and amplified microbial community to obtain a leaching solution 5 and activated sludge, wherein the leaching solution 5 is used as the preparation water of the alkaline oxidation reagent solution used in the step 2 and is circularly used for leaching the gold ore heap leaching residue 1, and the activated sludge is directly used as a gold-containing material and is conveyed to a smelting enterprise to recover valuable elements therein.
2. The method according to claim 1, wherein in step 1, the ventilation pipeline is made of PP, PVC, UPVC, stainless steel 304L, stainless steel 316 and stainless steel 316L, the depth of the ventilation pipeline is the same as that of the original leaching pipeline and collecting pipeline of the gold ore heap leaching field, and the diameter of the ventilation pipeline is not larger than that of the original leaching pipeline and collecting pipeline of the gold ore heap leaching field.
3. The method as claimed in claim 1, wherein the alkaline oxidizing agent solution in step 2 comprises sodium metabisulfite solution, sodium hypochlorite solution, sodium sulfite solution, sodium percarbonate solution and hydrogen peroxide solution, and the pH value of the alkaline oxidizing agent solution is adjusted to be between 7 and 9, and the mass concentration of the alkaline oxidizing agent solution is between 0.5 and 5 percent.
4. The in-situ treatment method of the gold ore heap leaching residues according to claim 3, characterized in that the in-situ leaching treatment time in the step 2 is 10-30 days, the dosage of the alkaline oxidation reagent solution is 0.1-0.2 times of the weight of the heap leaching residues per day, and the volume of the introduced air is 100-10000 times of the volume of the alkaline oxidation reagent solution.
5. The method as claimed in claim 1, wherein in step 3, the cyanogen reducing agent is one or more of ferrous sulfate, ferric sulfate, polyferric sulfate, copper sulfate and zinc sulfate, and is added until no new precipitate is formed in the liquid phase.
6. The method according to claim 1, wherein the microbial community added to the leaching solution 4 or the diluted leaching solution 4 in the step 6 is one or two of pseudomonas in proteobacteria flora and bacillus in firmicutes, the concentration of the suspension of the functional strain in the microbial community is not less than 10000/mL after cultivation, and the total cyanide concentration in the leaching solution 4 or the diluted leaching solution 4 is controlled to be not higher than 50mg/L, and the concentrations of other pollutants are not higher than 10mg/L respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116986731A (en) * | 2023-09-25 | 2023-11-03 | 长春黄金研究院有限公司 | Biological strengthening treatment method for waste water containing arsenic and ammonia nitrogen in gold industry |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4461834A (en) * | 1983-04-20 | 1984-07-24 | Homestake Mining Company | Strain of Pseudomonas paucimobilis |
| US5169532A (en) * | 1991-07-08 | 1992-12-08 | Homestake Mining Company | Method for biological removal of cyanides, thiocyanate and toxic heavy metals from highly alkaline environments |
| WO2011082507A1 (en) * | 2010-01-11 | 2011-07-14 | 长春黄金研究院 | Resource utilization and harmless treatment for cyanide tailing ore pulp |
| CN112028309A (en) * | 2020-08-22 | 2020-12-04 | 长春黄金研究院有限公司 | Method for resource recovery of high-concentration cyanide-containing wastewater and treatment of intermediate product |
| CN112358090A (en) * | 2020-11-18 | 2021-02-12 | 云南黄金矿业集团股份有限公司 | Harmless treatment method for gold smelting cyanide-and heavy metal-containing wastewater |
| CN112408648A (en) * | 2020-11-22 | 2021-02-26 | 长春黄金研究院有限公司 | Device and method for treating gold ore heap leaching solution |
-
2022
- 2022-12-01 CN CN202211532157.XA patent/CN115725851B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4461834A (en) * | 1983-04-20 | 1984-07-24 | Homestake Mining Company | Strain of Pseudomonas paucimobilis |
| US5169532A (en) * | 1991-07-08 | 1992-12-08 | Homestake Mining Company | Method for biological removal of cyanides, thiocyanate and toxic heavy metals from highly alkaline environments |
| WO2011082507A1 (en) * | 2010-01-11 | 2011-07-14 | 长春黄金研究院 | Resource utilization and harmless treatment for cyanide tailing ore pulp |
| CN112028309A (en) * | 2020-08-22 | 2020-12-04 | 长春黄金研究院有限公司 | Method for resource recovery of high-concentration cyanide-containing wastewater and treatment of intermediate product |
| CN112358090A (en) * | 2020-11-18 | 2021-02-12 | 云南黄金矿业集团股份有限公司 | Harmless treatment method for gold smelting cyanide-and heavy metal-containing wastewater |
| CN112408648A (en) * | 2020-11-22 | 2021-02-26 | 长春黄金研究院有限公司 | Device and method for treating gold ore heap leaching solution |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116986731A (en) * | 2023-09-25 | 2023-11-03 | 长春黄金研究院有限公司 | Biological strengthening treatment method for waste water containing arsenic and ammonia nitrogen in gold industry |
| CN116986731B (en) * | 2023-09-25 | 2024-01-05 | 长春黄金研究院有限公司 | Biological strengthening treatment method for waste water containing arsenic and ammonia nitrogen in gold industry |
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