CN112458310A - Method for extracting zinc salt from zinc-containing wastewater - Google Patents
Method for extracting zinc salt from zinc-containing wastewater Download PDFInfo
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- CN112458310A CN112458310A CN202011340590.4A CN202011340590A CN112458310A CN 112458310 A CN112458310 A CN 112458310A CN 202011340590 A CN202011340590 A CN 202011340590A CN 112458310 A CN112458310 A CN 112458310A
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 82
- 239000011701 zinc Substances 0.000 title claims abstract description 82
- 239000002351 wastewater Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 150000003751 zinc Chemical class 0.000 title claims abstract description 16
- 238000002386 leaching Methods 0.000 claims abstract description 40
- 238000000605 extraction Methods 0.000 claims abstract description 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 9
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 7
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 7
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 7
- 238000001179 sorption measurement Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 61
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 48
- 229910017052 cobalt Inorganic materials 0.000 claims description 24
- 239000010941 cobalt Substances 0.000 claims description 24
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 24
- 229910052759 nickel Inorganic materials 0.000 claims description 24
- 239000012074 organic phase Substances 0.000 claims description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- QUXFOKCUIZCKGS-UHFFFAOYSA-N bis(2,4,4-trimethylpentyl)phosphinic acid Chemical compound CC(C)(C)CC(C)CP(O)(=O)CC(C)CC(C)(C)C QUXFOKCUIZCKGS-UHFFFAOYSA-N 0.000 claims description 6
- 239000001110 calcium chloride Substances 0.000 claims description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 6
- 150000001879 copper Chemical class 0.000 claims description 6
- 239000003350 kerosene Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 241000228212 Aspergillus Species 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 241000228143 Penicillium Species 0.000 claims description 2
- 241000223259 Trichoderma Species 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- 235000010755 mineral Nutrition 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- SEGLCEQVOFDUPX-UHFFFAOYSA-N di-(2-ethylhexyl)phosphoric acid Chemical compound CCCCC(CC)COP(O)(=O)OCC(CC)CCCC SEGLCEQVOFDUPX-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OFOUIYGUOUTLLP-UHFFFAOYSA-N 2,4,4-trimethyl-1-(2,4,4-trimethylpentoxyphosphonoyloxy)pentane Chemical compound CC(C)(C)CC(C)COP(=O)OCC(C)CC(C)(C)C OFOUIYGUOUTLLP-UHFFFAOYSA-N 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- SNAMIIGIIUQQSP-UHFFFAOYSA-N bis(6-methylheptyl) hydrogen phosphate Chemical compound CC(C)CCCCCOP(O)(=O)OCCCCCC(C)C SNAMIIGIIUQQSP-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- HTDKEJXHILZNPP-UHFFFAOYSA-N dioctyl hydrogen phosphate Chemical compound CCCCCCCCOP(O)(=O)OCCCCCCCC HTDKEJXHILZNPP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019256 formaldehyde Nutrition 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
- C22B19/26—Refining solutions containing zinc values, e.g. obtained by leaching zinc ores
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
The invention aims to provide a method for extracting zinc salt from zinc-containing wastewater, which comprises the following steps: (1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution; (2) adding caustic soda into the first solution, and stirring to obtain a second solution; (3) adding sodium carbonate and hydrogen peroxide into the second solution to obtain a third solution; (4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue; (5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution; the method comprises the steps of firstly obtaining filter residues containing zinc through multi-stage treatment and filtration, then further treating the filter residues, and extracting the zinc-containing composition from the filter residues through extraction, thereby extracting the zinc-containing extract under the condition of ensuring that pollutants are cleaned by waste water.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a method for extracting zinc salt from zinc-containing wastewater.
Background
Zinc is a heavy metal resource which is abundant on the earth. The reserves of zinc ore resources in China are the second place in the world, and the zinc resources are widely applied to modern industrial production, such as smelting, pharmacy and food industries. Zinc is an indispensable element for human health, widely exists in human muscles and bones, but the content of zinc is very small, and serious consequences can occur if the zinc is in excess. The discharge of the zinc-containing wastewater has serious harm to human health and industrial and agricultural activities, has the characteristics of persistence, high toxicity, serious pollution and the like, once the wastewater enters the environment, the wastewater cannot be biodegraded, most of the wastewater participates in food chain circulation, and finally is accumulated in organisms to destroy normal physiological metabolic activities of the organisms, so that the human health is harmed.
The inventor finds that when the zinc-containing wastewater is treated, waste residues are obtained by treatment, and then the waste residues containing zinc are directly discarded, so that an effective method for recovering the zinc is not available.
Disclosure of Invention
In view of the problems in the prior art, the present invention is directed to one of the problems set forth above. The method for extracting zinc salt from zinc-containing wastewater comprises the following steps: (1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution; (2) adding caustic soda into the first solution, and stirring to obtain a second solution; (3) adding sodium carbonate and hydrogen peroxide into the second solution to obtain a third solution; (4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue; (5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution; (6) extracting zinc from the leaching solution obtained in the step (5) to obtain zinc salt andextracting zinc mixed liquor, wherein the zinc extraction comprises the following steps: mixing the organic phase with the leaching solution, adding NaCl and CaCl2Standing for 2h, and after layering, separating the liquid from the organic phase to obtain a zinc extraction mixed solution; (7) extracting nickel, cobalt and copper from the zinc extraction mixed solution obtained in the step (6) to obtain corresponding nickel, cobalt and copper salt and raffinate; (8) and (3) using the raffinate obtained in the step (7) as a leaching agent and the extraction method for extracting zinc in the step (6) to obtain the zinc-containing composition.
Preferably, the leaching agent is one or more of formic acid, acetic acid and citric acid.
Preferably, the biosorbent used in the bioadsorbent of step (4) is a mixture of Aspergillus, Penicillium, Trichoderma and sodium polyaminosaccharide phosphate.
Preferably, the organic phase is 15% to 55% by volume: 45-85% of extractant and solvent oil.
Preferably, the solvent oil is one or two of kerosene and sulfonated kerosene.
Preferably, sodium carbonate, hydrogen peroxide and sodium bicarbonate are added into the second solution in the step (3).
Preferably, the extracting agent used for extracting nickel, cobalt and copper in the step (7) is one or more of P204, P507 or Cyanex 272.
Preferably, the weight part ratio of the filter residue to the leaching agent in the step (5) is 1: 10.
p204: p204, Chinese name: bis (2-ethylhexyl) phosphate; bis (2-ethylhexyl) phosphate; diisooctyl phosphate; dioctyl phosphate, national CAS accession number: 298-07-7, is a colorless, transparent, and viscous liquid. Freezing point-60 deg.C, relative density 0.973(25/25 deg.C), refractive index 1.4420(25 deg.C), boiling point 209 deg.C (1.33 kPa). The product is used as an organic solvent, is an acidic extracting agent and is an organic synthesis intermediate. In kerosene, hydrogen-bonded dimer structure is adopted to cover polar phosphate group, and when being complexed with metal ions, the kerosene usually takes part in reaction in dimeric form
Cyanex 272: bis (2,4, 4-trimethylpentyl) phosphonic acid (disooctylphosphinic acid), CAS number: 83411-71-6, EINECS No.: 280-445-7, which is sold as Cyanex272, is an acidic phosphinic acid extractant, originally developed for separating nickel and cobalt, but has excellent extraction performance, and the application range of the extractant is continuously expanded, so that the extractant is used for separating other metal systems.
P507: p-507 chemical name: 2-ethylhexyl phosphate mono-2-ethylhexyl ester, of the formula [ CH3(CH2)3CH (C2H5) CH2O ] [ CH3(CH2)3CH (C2H5) CH2] HPO is a colorless or pale yellow transparent oily liquid.
Has the advantages that: the method comprises the steps of firstly obtaining filter residues containing zinc through multi-stage treatment and filtration, then further treating the filter residues, and extracting the zinc-containing composition from the filter residues through extraction, thereby extracting the zinc-containing extract under the condition of ensuring that pollutants are cleaned by waste water.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for extracting zinc salt from zinc-containing wastewater, which is characterized by comprising the following steps:
(1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution;
(2) adding caustic soda into the first solution, and stirring to obtain a second solution;
(3) adding sodium carbonate and hydrogen peroxide into the second solution to obtain a third solution;
(4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue;
(5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution;
(6) extracting zinc from the leaching solution obtained in the step (5) to obtain zinc salt and zinc extraction mixed solution,
the zinc extraction comprises the following steps: mixing the organic phase with the leaching solution, adding NaCl and CaCl2Standing for 2h, and after layering, separating the liquid from the organic phase to obtain a zinc extraction mixed solution;
(7) extracting nickel, cobalt and copper from the zinc extraction mixed solution obtained in the step (6), wherein an organic phase is used for extracting nickel, cobalt and copper to obtain corresponding nickel, cobalt and copper salt and raffinate;
(8) and (3) using the raffinate obtained in the step (7) as a leaching agent and the extraction method for extracting zinc in the step (6) to obtain the zinc-containing composition.
The leaching agent is formic acid, and the organic phase is 15% by volume: 85% of extractant and solvent oil, and the extractant used for extracting the nickel, cobalt and copper in the step (7) is P204.
Example 2
A method for extracting zinc salt from zinc-containing wastewater, which is characterized by comprising the following steps:
(1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution;
(2) adding caustic soda into the first solution, and stirring to obtain a second solution;
(3) adding sodium carbonate, hydrogen peroxide and sodium bicarbonate into the second solution to obtain a third solution;
(4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue;
(5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution;
(6) extracting zinc from the leaching solution obtained in the step (5) to obtain zinc salt and zinc extraction mixed solution,
the zinc extraction comprises the following steps: mixing the organic phase with the leaching solution, adding NaCl and CaCl2Standing for 2h, and after layering, separating the liquid from the organic phase to obtain a zinc extraction mixed solution;
(7) extracting nickel, cobalt and copper from the zinc extraction mixed solution obtained in the step (6), wherein an organic phase is used for extracting nickel, cobalt and copper to obtain corresponding nickel, cobalt and copper salt and raffinate;
(8) and (3) using the raffinate obtained in the step (7) as a leaching agent and the extraction method for extracting zinc in the step (6) to obtain the zinc-containing composition.
The leaching agent is citric acid, and the organic phase is a mixture of the following components in a volume ratio of 55%: 45% of extracting agent and solvent oil, wherein the extracting agent used for extracting the nickel, cobalt and copper in the step (7) is P204 and P507. .
Example 3
A method for extracting zinc salt from zinc-containing wastewater, which is characterized by comprising the following steps:
(1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution;
(2) adding caustic soda into the first solution, and stirring to obtain a second solution;
(3) adding sodium carbonate and hydrogen peroxide into the second solution to obtain a third solution;
(4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue;
(5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution;
(6) extracting zinc from the leaching solution obtained in the step (5) to obtain zinc salt and zinc extraction mixed solution,
the zinc extraction comprises the following steps: mixing the organic phase with the leaching solution, adding NaCl and CaCl2Standing for 2h, and after layering, separating the liquid from the organic phase to obtain a zinc extraction mixed solution;
(7) extracting nickel, cobalt and copper from the zinc extraction mixed solution obtained in the step (6), wherein an organic phase is used for extracting nickel, cobalt and copper to obtain corresponding nickel, cobalt and copper salt and raffinate;
(8) and (3) using the raffinate obtained in the step (7) as a leaching agent and the extraction method for extracting zinc in the step (6) to obtain the zinc-containing composition.
The leaching agent is citric acid, and the organic phase is a mixture of the following components in a volume ratio of 55%: 85 percent of extractant and solvent oil, and the extractant used for extracting the nickel, cobalt and copper in the step (7) is Cyanex 272. .
Example 4
A method for extracting zinc salt from zinc-containing wastewater, which is characterized by comprising the following steps:
(1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution;
(2) adding caustic soda into the first solution, and stirring to obtain a second solution;
(3) adding sodium carbonate and hydrogen peroxide into the second solution to obtain a third solution;
(4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue;
(5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution;
(6) extracting zinc from the leaching solution obtained in the step (5) to obtain zinc salt and zinc extraction mixed solution,
the zinc extraction comprises the following steps: mixing the organic phase with the leaching solution, adding NaCl and CaCl2Standing for 2h, and after layering, separating the liquid from the organic phase to obtain a zinc extraction mixed solution;
(7) extracting nickel, cobalt and copper from the zinc extraction mixed solution obtained in the step (6), wherein an organic phase is used for extracting nickel, cobalt and copper to obtain corresponding nickel, cobalt and copper salt and raffinate;
(8) and (3) using the raffinate obtained in the step (7) as a leaching agent and the extraction method for extracting zinc in the step (6) to obtain the zinc-containing composition.
The leaching agent is formic acid, and the organic phase is 15-55% by volume: 45% -85% of an extracting agent and solvent oil, wherein the extracting agent used for extracting the nickel, cobalt and copper in the step (7) is P204. .
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for extracting zinc salt from zinc-containing wastewater, which is characterized by comprising the following steps:
(1) adding a sodium polyacrylate mixture into the zinc-containing wastewater, and stirring to obtain a first solution;
(2) adding caustic soda into the first solution, and stirring to obtain a second solution;
(3) adding sodium carbonate and hydrogen peroxide into the second solution to obtain a third solution;
(4) carrying out biological adsorption on the third solution, and filtering to obtain filter residue;
(5) mixing the filter residue leaching agents, and standing for 5 hours to obtain a zinc-containing leaching solution;
(6) extracting zinc from the leaching solution obtained in the step (5) to obtain zinc salt and zinc extraction mixed solution,
the zinc extraction comprises the following steps: mixing the organic phase with the leaching solution, adding NaCl and CaCl2Standing for 2h, and after layering, separating the liquid from the organic phase to obtain a zinc extraction mixed solution;
(7) extracting nickel, cobalt and copper from the zinc extraction mixed solution obtained in the step (6), wherein an organic phase is used for extracting nickel, cobalt and copper to obtain corresponding nickel, cobalt and copper salt and raffinate;
(8) and (3) using the raffinate obtained in the step (7) as a leaching agent and the extraction method for extracting zinc in the step (6) to obtain the zinc-containing composition.
2. The method of claim 1, wherein the leaching agent is one or more of formic acid, acetic acid, and citric acid.
3. The method according to claim 1, wherein the biosorbent used in the bioadsorbent of step (4) is a mixture of Aspergillus, Penicillium, Trichoderma and sodium polyaminosaccharide phosphate.
4. The process according to claim 1, characterized in that the organic phase is 15-55% by volume: 45-85% of extractant and solvent oil.
5. The method of claim 4, wherein the mineral spirit is one or both of kerosene and sulfonated kerosene.
6. The method of claim 1, wherein step (3) adds sodium carbonate, hydrogen peroxide, and sodium bicarbonate to the second solution.
7. The method according to claim 1, wherein the extracting agent used in the step (7) for extracting nickel, cobalt and copper is one or more of P204, P507 or Cyanex 272.
8. The method according to claim 1, wherein the weight part ratio of the filter residue to the leaching agent in the step (5) is 1: 10.
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| CN202011340590.4A CN112458310A (en) | 2020-11-25 | 2020-11-25 | Method for extracting zinc salt from zinc-containing wastewater |
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| CN202011340590.4A CN112458310A (en) | 2020-11-25 | 2020-11-25 | Method for extracting zinc salt from zinc-containing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373309A (en) * | 2021-05-13 | 2021-09-10 | 浙江省遂昌金矿有限公司 | Process for recovering zinc from gold cyanide mud acid pickling waste liquid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148999A (en) * | 1995-10-20 | 1997-05-07 | 东国制药株式会社 | Biosorbent for heavy metals prepared from biomass |
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