CN115110101A - Method for preparing liquid caustic soda by treating ternary precursor washing waste liquid through membrane electrolysis method - Google Patents
Method for preparing liquid caustic soda by treating ternary precursor washing waste liquid through membrane electrolysis method Download PDFInfo
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- CN115110101A CN115110101A CN202210606351.1A CN202210606351A CN115110101A CN 115110101 A CN115110101 A CN 115110101A CN 202210606351 A CN202210606351 A CN 202210606351A CN 115110101 A CN115110101 A CN 115110101A
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- Prior art keywords
- electrolytic cell
- waste liquid
- washing waste
- ternary precursor
- caustic soda
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 title claims abstract description 147
- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 235000011121 sodium hydroxide Nutrition 0.000 title claims abstract description 49
- 239000002699 waste material Substances 0.000 title claims abstract description 35
- 238000005406 washing Methods 0.000 title claims abstract description 33
- 239000002243 precursor Substances 0.000 title claims abstract description 32
- 239000012528 membrane Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 20
- 238000005341 cation exchange Methods 0.000 claims abstract description 14
- 239000003792 electrolyte Substances 0.000 claims abstract description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 12
- 238000005260 corrosion Methods 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052737 gold Inorganic materials 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 3
- 238000002848 electrochemical method Methods 0.000 abstract description 3
- 239000011734 sodium Substances 0.000 description 11
- 238000011084 recovery Methods 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/14—Alkali metal compounds
- C25B1/16—Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a method for preparing liquid caustic soda by treating ternary precursor washing waste liquid by a membrane electrolysis method, which comprises the following steps: introducing the ternary precursor washing waste liquid into an electrolytic cell; the cathode and the anode in the electrolytic cell are both inert electrodes, a cation exchange membrane is arranged in the electrolytic cell, liquid between an anode region and the cation exchange membrane is ternary precursor washing waste liquid, and electrolyte between the cathode region and the cation exchange membrane is NaOH solution with the concentration of less than or equal to 1 g/L; electrifying the electrolytic cell; when the NaOH solution in the cathode area reaches 200g/L-250g/L, stopping electrifying the electrolytic cell, and separating and removing the NaOH solution in the cathode area to obtain the electrolyzed NaOH solution; and purifying the electrolyzed NaOH solution to prepare liquid caustic soda. The invention can treat the ternary precursor washing waste liquid in a pollution-free way by an electrochemical method.
Description
Technical Field
The invention belongs to the technical field of a treatment process of a ternary precursor washing waste liquid, and particularly relates to a method for preparing liquid caustic soda by treating the ternary precursor washing waste liquid by a membrane electrolysis method.
Background
In the process of producing the lithium ion battery, Na remained in the waste liquid after the aging and washing of the ternary precursor 2 SO 4 The content is very high, the traditional recovery method is a crystallization method, and Na is prepared by the crystallization method 2 SO 4 . The recovery method needs a certain cost for treating the waste liquid, and the prepared product sodium sulfate crystal has relatively low market price and low recovery benefit, and does not conform to the recycling concept.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing liquid caustic soda by treating a ternary precursor washing waste liquid through a membrane electrolysis method for treating the washing waste liquid in a pollution-free manner by an electrochemical method.
The invention adopts the following technical scheme:
a method for preparing liquid caustic soda by treating ternary precursor washing waste liquid by a membrane electrolysis method is characterized by comprising the following steps:
(1) introducing the ternary precursor washing waste liquid into an electrolytic cell; the cathode and the anode in the electrolytic cell are both inert electrodes, a cation exchange membrane is arranged in the electrolytic cell, the liquid between the anode area and the cation exchange membrane is 2-4 g/L of ternary precursor washing waste liquid, and the electrolyte between the cathode area and the cation exchange membrane is NaOH solution with the concentration of less than or equal to 1 g/L;
(2) electrifying the electrolytic cell, and controlling the electrolytic voltage in the electrolytic cell to be 2.0V-3.5V;
(3) when the NaOH solution in the cathode area reaches 200g/L-250g/L, stopping electrifying the electrolytic cell, and separating and removing the NaOH solution in the cathode area to obtain the electrolyzed NaOH solution;
(4) and purifying the electrolyzed NaOH solution to prepare liquid caustic soda.
The method for preparing the liquid caustic soda by treating the ternary precursor washing waste liquid by the membrane electrolysis method is characterized in that the cathode in the electrolytic cell in the step (1) is made of a corrosion-resistant conductive conductor; the anode is made of a corrosion-resistant conductive conductor.
The method for preparing the liquid caustic soda by treating the ternary precursor washing waste liquid according to the membrane electrolysis method is characterized in that a cathode in the electrolysis cell in the step (1) is one of a graphite electrode, a platinum electrode, a gold electrode and a silver electrode; the anode in the electrolytic cell is one of a graphite electrode, a platinum electrode, a gold electrode and a silver electrode.
The method for preparing the liquid caustic soda by treating the ternary precursor washing waste liquid by the membrane electrolysis method is characterized in that the electrolytic cell is made of a corrosion-resistant material.
The method for preparing the liquid caustic soda by treating the ternary precursor washing waste liquid by the membrane electrolysis method is characterized in that the material of the electrolytic cell is homo-polypropylene or tri-type polypropylene.
The invention has the beneficial technical effects that: the invention relates to a post-treatment process of a ternary precursor aging washing waste liquid, which is used for treating Na in the ternary precursor washing waste liquid 2 SO 4 NaOH is prepared by a membrane electrolysis method, so that the price of caustic soda is continuously increased dramatically at present; secondly, the development direction of enterprises is met, and the cyclic regeneration is facilitated; finally, the produced NaOH can be used for the reaction control end of the precursor industry. The invention treats the washing waste liquid without pollution by an electrochemical method, recycles Na, can reduce the cost and improve the quality of the recovered product.
Drawings
Fig. 1 is a schematic diagram of the working principle of the present invention.
Detailed Description
The invention relates to a method for preparing liquid caustic soda by treating ternary precursor washing waste liquid by a membrane electrolysis method, which comprises the following steps:
(1) introducing the ternary precursor washing waste liquid into an electrolytic cell; the cathode and the anode in the electrolytic cell are both inert electrodes, a cation exchange membrane is arranged in the electrolytic cell, the liquid between the anode area and the cation exchange membrane is 2-4 g/L of ternary precursor washing waste liquid, and the electrolyte between the cathode area and the cation exchange membrane is NaOH solution with the concentration of less than or equal to 1 g/L; the cathode in the electrolytic cell is made of a corrosion-resistant conductive conductor; the anode is made of a corrosion-resistant conductive conductor, preferably, the cathode in the electrolytic cell is one of a graphite electrode, a platinum electrode, a gold electrode and a silver electrode, and the anode in the electrolytic cell is one of a graphite electrode, a platinum electrode, a gold electrode and a silver electrode. The electrolytic cell is made of corrosion-resistant materials, and the electrolytic cell is made of homo-polypropylene or tri-polypropylene.
(2) Electrifying the electrolytic cell, and controlling the electrolytic voltage in the electrolytic cell to be 2.0V-3.5V; under the action of an electric field, Na + Moving towards the cathode, under the influence of electrochemical reaction, oxygen evolves at the anode, resulting in a decrease in pH near the anode region, hydrogen evolves at the cathode, resulting in an increase in cathode pH, and as time progresses, the sodium sulfate waste solution is gradually diluted, and as a further result, the anode Na 2 SO 4 The concentration is gradually reduced to gradually form H 2 SO 4 And low concentration of Na 2 SO 4 The cathode produces NaOH. Fig. 1 is a schematic diagram of the working principle of the present invention.
(3) And when the NaOH solution in the cathode area reaches 200-250 g/L, stopping electrifying the electrolytic cell, and separating and removing the NaOH solution in the cathode area to obtain the electrolyzed NaOH solution.
(4) And purifying the electrolyzed NaOH solution to prepare liquid caustic soda.
Example 1
Introducing the aged ternary precursor washing waste liquid into an electrolytic cell, namely introducing concentrated Na in figure 1 2 SO 4 An area; ternary precursor washing waste liquid is arranged between the anode region and the cation exchange membrane, and the electrolyte between the cathode region and the cation exchange membrane is 1g/L NaOH solution. Electrifying the electrolytic cell, and supplying the electrolytic cell with a cell voltage exceeding 2V, wherein the current density is high; under the action of electric field, the anode region gradually generates H 2 SO 4, And Na 2 SO 4 The concentration is reduced, NaOH is gradually formed in the cathode area, the reaction is carried out for a certain time, and the concentrated Na is tested 2 SO 4 Na of the region 2 SO 4 The concentration of the solution is not lower than 2g/L, and then the NaOH solution at the cathode is removed. The removed NaOH solution is purified to prepare the liquid caustic soda.
Claims (5)
1. A method for preparing liquid caustic soda by treating ternary precursor washing waste liquid by a membrane electrolysis method is characterized by comprising the following steps:
(1) introducing the ternary precursor washing waste liquid into an electrolytic cell; the cathode and the anode in the electrolytic cell are both inert electrodes, a cation exchange membrane is arranged in the electrolytic cell, the liquid between the anode area and the cation exchange membrane is 2-4 g/L of ternary precursor washing waste liquid, and the electrolyte between the cathode area and the cation exchange membrane is NaOH solution with the concentration of less than or equal to 1 g/L;
(2) electrifying the electrolytic cell, and controlling the electrolytic voltage in the electrolytic cell to be 2.0V-3.5V;
(3) when the NaOH solution in the cathode area reaches 200g/L-250g/L, stopping electrifying the electrolytic cell, and separating and removing the NaOH solution in the cathode area to obtain the electrolyzed NaOH solution;
(4) and purifying the electrolyzed NaOH solution to prepare liquid caustic soda.
2. The method for preparing liquid caustic soda by treating ternary precursor washing waste liquid by using the membrane electrolysis method according to claim 1, wherein the cathode in the electrolysis cell in the step (1) is made of a corrosion-resistant conductive conductor; the anode is made of a corrosion-resistant conductive conductor.
3. The method for preparing liquid caustic soda by processing ternary precursor washing waste liquid by using a membrane electrolysis method according to claim 2, wherein the cathode in the electrolysis cell in the step (1) is one of a graphite electrode, a platinum electrode, a gold electrode and a silver electrode; the anode in the electrolytic cell is one of a graphite electrode, a platinum electrode, a gold electrode and a silver electrode.
4. The method for preparing liquid caustic soda by treating ternary precursor washing waste liquid by using a membrane electrolysis method according to claim 1, wherein the electrolytic cell is made of a corrosion-resistant material.
5. The method for preparing caustic soda solution by treating ternary precursor washing waste liquid through membrane electrolysis according to claim 4, wherein the electrolytic cell is made of homo-polypropylene or tri-polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210606351.1A CN115110101A (en) | 2022-05-31 | 2022-05-31 | Method for preparing liquid caustic soda by treating ternary precursor washing waste liquid through membrane electrolysis method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210606351.1A CN115110101A (en) | 2022-05-31 | 2022-05-31 | Method for preparing liquid caustic soda by treating ternary precursor washing waste liquid through membrane electrolysis method |
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| Publication Number | Publication Date |
|---|---|
| CN115110101A true CN115110101A (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210606351.1A Pending CN115110101A (en) | 2022-05-31 | 2022-05-31 | Method for preparing liquid caustic soda by treating ternary precursor washing waste liquid through membrane electrolysis method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115110101A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622113A (en) * | 1983-11-17 | 1986-11-11 | Toyo Soda Manufacturing Co., Ltd. | Process for producing caustic alkalis |
| US5290405A (en) * | 1991-05-24 | 1994-03-01 | Ceramatec, Inc. | NaOH production from ceramic electrolytic cell |
| CN102605383A (en) * | 2012-03-26 | 2012-07-25 | 北京化工大学 | Method and device for hydrogen-circulating electrolysis and application of the method and device in production of aluminum oxide |
| CN107022769A (en) * | 2017-04-13 | 2017-08-08 | 盛亮 | A kind of method and device that high-purity monohydrate lithium hydroxide is extracted from the material containing lithium carbonate |
-
2022
- 2022-05-31 CN CN202210606351.1A patent/CN115110101A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622113A (en) * | 1983-11-17 | 1986-11-11 | Toyo Soda Manufacturing Co., Ltd. | Process for producing caustic alkalis |
| US5290405A (en) * | 1991-05-24 | 1994-03-01 | Ceramatec, Inc. | NaOH production from ceramic electrolytic cell |
| CN102605383A (en) * | 2012-03-26 | 2012-07-25 | 北京化工大学 | Method and device for hydrogen-circulating electrolysis and application of the method and device in production of aluminum oxide |
| CN107022769A (en) * | 2017-04-13 | 2017-08-08 | 盛亮 | A kind of method and device that high-purity monohydrate lithium hydroxide is extracted from the material containing lithium carbonate |
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Application publication date: 20220927 |
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| RJ01 | Rejection of invention patent application after publication |