Ternary alkali washing water treatment unit and production system of ternary precursor material
By designing a ternary alkaline washing water treatment unit and using precision filtration and section nanofiltration technology to treat the ternary alkaline washing water, the problem of direct mixing of ternary alkaline washing water in the prior art has been solved, and efficient wastewater treatment and cost reduction are achieved.
Patent Information
- Application Number
- CN202421848319.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-01
AI Technical Summary
In the prior art, the ternary alkaline washing water is directly mixed with the ternary mother liquor and the ternary washing water, resulting in high processing volume and low efficiency.
A ternary alkaline rinse water treatment unit is designed, including a precision filtration assembly, a first nanofiltration assembly and a second nanofiltration assembly. The ternary alkaline rinse is treated by precision filtration and section nanofiltration to separate and concentrate sodium sulfate to reduce the consumption of fresh lye.
It effectively reduces the consumption of alkali liquid, reduces washing costs, and improves the efficiency of wastewater treatment, making the production system of ternary precursor materials more efficient and economical.
Smart Images
Figure CN222989958U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ternary precursor materials, and particularly relates to a ternary alkali washing water treatment unit and a production system of ternary precursor materials. Background Art
[0002] Ternary cathode materials are prepared by high-temperature sintering reaction of ternary precursor materials (such as NCM, referring to nickel cobalt manganese oxide) and lithium salts (such as lithium carbonate or lithium hydroxide). Therefore, ternary precursor materials are widely used in lithium-ion batteries, and their preparation process has an important impact on the performance of the materials. The co-precipitation method is a common and effective method for preparing ternary precursor materials. The following are the general steps for preparing ternary precursor materials by the co-precipitation method:
[0003] 1. Solution preparation: Prepare metal salt solutions containing nickel, cobalt, and manganese (such as sulfates, nitrates, or chlorides), usually in the required molar ratio. For example, for NCM (Ni:Co:Mn = 1:1:1), equimolar solutions of NiSO4, CoSO4, and MnSO4 need to be prepared.
[0004] 2. Co-precipitation reaction: Mix the above metal salt solutions with a precipitant (such as hydrogen peroxide and ammonia water) to make the metal ions react with the precipitant to form metal hydroxide precipitates.
[0005] 3. Aging treatment: After the precipitate is formed, aging treatment is usually carried out to make the crystal structure of the precipitate more perfect by controlling the temperature and time.
[0006] 4. Filtration: The aged precipitate needs to be subjected to solid-liquid separation to remove the ternary mother liquor to obtain the precipitate. Solid-liquid separation usually uses filtration or centrifugal separation.
[0007] 5. Washing: The precipitate obtained by solid-liquid separation also needs to be washed twice to remove the residual reactants and by-products on the surface. During this process, primary wash water (also known as ternary wash water) and ternary alkali wash water (also known as ternary alkali wash water) will be generated.
[0008] 6. Drying: The washed precipitate is dried until it is completely dry.
[0009] 7. High-temperature calcination: The dried precipitate often needs to be further calcined to promote the phase transformation and particle growth of the material, and finally form a ternary precursor material with good electrochemical performance.
[0010] Three kinds of waste water will be generated in the above process, namely ternary mother liquor, ternary wash water, and ternary alkali wash water. At present, these three kinds of waste water are usually directly mixed and then comprehensively treated to recover ammonia water, sodium sulfate, and pure water. However, due to the large amount of ternary wash water and ternary alkali wash water, direct mixing leads to a high treatment volume and low efficiency. Summary of the Invention
[0011] The main object of the present utility model is to provide a ternary alkali washing water treatment unit and a production system for ternary precursor materials, so as to solve the technical problems brought about by directly mixing ternary alkali washing water with ternary mother liquor and ternary washing water in the prior art.
[0012] To achieve the above object, according to the first aspect of the present utility model, a ternary alkali washing water treatment unit is provided, and the technical solution is as follows:
[0013] The ternary alkali washing water treatment unit, wherein the ternary alkali washing water is obtained by reacting a ternary solution, performing solid-liquid separation, primary washing and secondary washing, and includes: a precision filtration assembly for filtering and treating production wastewater and outputting a filtrate with an SS content ≤ 0.2 mg / L; a first nanofiltration assembly for concentrating and separating sodium sulfate in the filtrate and outputting a first produced water with a sodium sulfate content ≤ 5 g / L and a first concentrated water with a sodium sulfate content ≥ 90 g / L; a second nanofiltration assembly for concentrating and separating sodium sulfate in the first produced water and outputting a second produced water with a sodium sulfate content ≤ 0.5 g / L and a second concentrated water with a sodium sulfate content ≥ 16 g / L.
[0014] As a further improvement of the above ternary alkali washing water treatment unit: it further includes a raw water tank for storing ternary alkali washing water.
[0015] As a further improvement of the above ternary alkali washing water treatment unit: the precision filtration assembly includes a precision filter, a filtrate storage tank for storing the filtrate output by the precision filter, and a filter residue storage tank for storing the filter residue output by the precision filter.
[0016] As a further improvement of the above ternary alkali washing water treatment unit: it further includes a filter press for pressure filtering the filter residue.
[0017] As a further improvement of the above ternary alkali washing water treatment unit: the first nanofiltration assembly includes a first nanofiltration assembly, a first storage tank for storing the first produced water output by the first nanofiltration assembly, and a second storage tank for storing the first concentrated water output by the first nanofiltration assembly.
[0018] As a further improvement of the above ternary alkali washing water treatment unit: the second nanofiltration assembly includes a second nanofiltration assembly, a third storage tank for storing the second produced water output by the second nanofiltration assembly, and a fourth storage tank for storing the second concentrated water output by the second nanofiltration assembly.
[0019] As a further improvement of the above ternary alkali washing water treatment unit: it further includes a first reflux pipeline for refluxing the second concentrated water in the fourth storage tank to the first nanofiltration assembly.
[0020] In order to achieve the above object, according to the second aspect of the utility model, a production system of a ternary precursor material is provided, and the technical solution is as follows:
[0021] A production system for a ternary precursor material includes: a reaction unit for causing a ternary solution to undergo a coprecipitation reaction to generate a solid-liquid mixture; a solid-liquid separation unit for performing solid-liquid separation on the solid-liquid mixture and outputting a first solid; a first washing unit for performing a washing treatment on the first solid and outputting a second solid; a second washing unit for performing a washing treatment on the second solid and outputting a ternary precursor material and a ternary alkaline washing water; and the ternary alkaline washing water treatment unit described in the first aspect above.
[0022] As a further improvement of the above-mentioned production system of the ternary precursor material: it also includes a second reflux pipeline for returning the second produced water to the second washing unit.
[0023] As a further improvement of the above-mentioned production system of ternary precursor materials: it also includes a regulating tank for storing ternary mother liquor, ternary washing water and first concentrated water.
[0024] The ternary alkaline washing water treatment unit of the utility model first uses a precision filtration component to remove particulate matter, reducing the risk of clogging of the first nanofiltration component and the second nanofiltration component, and then uses a segment nanofiltration unit to concentrate and separate the sodium sulfate byproduct, so as to obtain a second produced water with a very small sodium sulfate content, which can be directly reused in the second washing unit in the production of the ternary precursor material, effectively reducing the consumption of fresh alkali solution and reducing the washing cost. At the same time, sodium sulfate is enriched in the first concentrated water, and the amount of water in the first concentrated water is small. Therefore, the first concentrated water is mixed with the ternary mother liquor and the ternary washing water and then comprehensively treated to significantly improve the treatment efficiency. It can be seen that the ternary alkaline washing water treatment unit of the utility model and the production system of the ternary precursor material are simple in structure, low in investment and operation costs, and effectively solve the technical problems caused by the direct mixing of the ternary alkaline washing water with the ternary mother liquor and the ternary washing water in the prior art, and have extremely strong practicality.
[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The drawings constituting a part of the present invention are used to assist the understanding of the present invention. The contents provided in the drawings and their related descriptions in the present invention can be used to explain the present invention, but do not constitute an improper limitation on the present invention.
[0027] In the attached picture:
[0028] Figure 1This is a schematic structural diagram of the ternary alkali washing water treatment unit and the production system of ternary precursor materials in Embodiment 1 of the present utility model.
[0029] The relevant markings in the above-mentioned drawings are as follows:
[0030] 100 - Ternary alkali washing water treatment unit, 111 - Precision filter, 112 - Filtrate storage tank, 113 - Filter residue storage tank, 114 - Filter press, 121 - First nanofiltration module, 122 - First storage tank, 123 - Second storage tank, 131 - Second nanofiltration module, 132 - Third storage tank, 133 - Fourth storage tank, 140 - Raw water tank, 150 - First reflux pipeline, 152 - Second reflux pipeline, 200 - Reaction unit, 300 - Aging unit, 400 - Solid-liquid separation unit, 500 - First washing unit, 600 - Second washing unit. Detailed implementation manners
[0031] The present utility model will be clearly and completely described below with reference to the drawings. Those of ordinary skill in the art will be able to implement the present utility model based on these descriptions. Before describing the present utility model with reference to the drawings, it should be particularly noted that:
[0032] The technical solutions and technical features provided in each part including the following description in the present utility model can be combined with each other without conflict.
[0033] In addition, the embodiments of the present utility model involved in the following description are usually only part of the embodiments of the present utility model, rather than all embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts should fall within the protection scope of the present utility model.
[0034] Regarding the terms and units in the present utility model. The terms "including", "having" and any variations thereof in the specification, claims and relevant parts of the present utility model are intended to cover non-exclusive inclusion.
[0035] Embodiment 1
[0036] Figure 1 This is a schematic structural diagram of the ternary alkali washing water treatment unit and the production system of ternary precursor materials in this embodiment.
[0037] As Figure 1As shown in the figure, the production system of the ternary precursor material includes a reaction unit 200, an aging unit 300, a solid-liquid separation unit 400, a first washing unit 500, a second washing unit 600, and a ternary alkaline washing water treatment unit 100. The reaction unit 200 is used to make the ternary solution undergo a coprecipitation reaction to generate a solid-liquid mixture. The aging unit 300 is used to age the solid-liquid mixture. The solid-liquid separation unit 400 is used to perform solid-liquid separation on the solid-liquid mixture and output the first solid. The first washing unit 500 is used to wash the first solid and output the second solid. The second washing unit 600 is used to wash the second solid and output the ternary precursor material and ternary alkaline washing water.
[0038] The ternary alkaline washing water is obtained after the ternary solution undergoes reaction, solid-liquid separation, primary washing, and second washing, and is stored in the raw water tank 140. The ternary alkaline washing water treatment unit 100 includes a precision filtration component, a first nanofiltration component 121, and a second nanofiltration component 131.
[0039] The precision filtration component is used to filter the ternary alkaline washing water and output a filtrate with an SS content ≤ 0.2 mg / L. The precision filtration component includes a precision filter 111, a filtrate storage tank 112 for storing the filtrate output by the precision filter 111, a filter residue storage tank 113 for storing the filter residue output by the precision filter 111, and a filter press 114 for performing pressure filtration on the filter residue.
[0040] The first nanofiltration component 121 is used to concentrate and separate sodium sulfate in the filtrate and output a first produced water with a sodium sulfate content ≤ 5 g / L and a first concentrated water with a sodium sulfate content ≥ 90 g / L. The first nanofiltration component 121 includes a first nanofiltration component 121, a first storage tank 122 for storing the first produced water output by the first nanofiltration component 121, and a second storage tank 123 for storing the first concentrated water output by the first nanofiltration component 121. The first concentrated water in the second storage tank 123 is further mixed and stabilized with the ternary mother liquor and ternary washing water in the adjustment tank and then comprehensively treated.
[0041] The second nanofiltration component 131 is used to concentrate and separate sodium sulfate in the first produced water and output a second produced water with a sodium sulfate content ≤ 0.5 g / L and a second concentrated water with a sodium sulfate content ≥ 16 g / L. The second nanofiltration component 131 includes a second nanofiltration component 131, a third storage tank 132 for storing the second produced water output by the second nanofiltration component 131, and a fourth storage tank 133 for storing the second concentrated water output by the second nanofiltration component 131. The second concentrated water in the fourth storage tank 133 is refluxed to the first nanofiltration component 121 through the first reflux pipeline 150. The second produced water in the third storage tank 132 is refluxed to the second washing unit 600 through the second reflux pipeline 152.
[0042] Table 1 shows the changes in water quality parameters during the operation of the ternary alkali washing water treatment unit 100 in this embodiment. As shown in Table 1, the SS content in the filtrate is only 0.1 mg / L, indicating that the particulate matter content is very low. The first nanofiltration module 121 performs primary concentration and separation on sodium sulfate, making the Na2SO4 content in the first produced water as low as 2 g / L, while the Na2SO4 content in the first concentrated water is as high as 91.3 g / L. Under the further action of the second nanofiltration module 131 on the first produced water, the Na2SO4 content in the second produced water is as low as 0.2 g / L, obtaining a highly pure alkali solution.
[0043] The treatment capacity of the precision filter 111 is 244.9 m 3 / day, the first produced water volume can reach 208.7 m 3 / day, and the second produced water volume can reach 187.8 m 3 / day, that is, the alkali recovery rate is 76.7%, and the purity is relatively high. Therefore, it can be directly reused in the second washing unit 600, saving a large amount of alkali consumption cost every day.
[0044] It has been verified that the traditional production system of ternary precursor materials does not separately recover the alkali solution from ternary alkali washing water, that is, it does not recycle the second produced water. The dry-base alkali consumption per ton of ternary precursor materials is about 0.1 ton. After using the ternary alkali washing water treatment unit of the present utility model to treat ternary alkali washing water and recycle the second produced water to the second washing unit, the dry-base alkali consumption can be reduced to 0.02 ton.
[0045] Table 1
[0046]
[0047] The above has described the relevant content of the present utility model. Those of ordinary skill in the art will be able to implement the present utility model based on these descriptions. Based on the above content of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.
Claims
1. A ternary alkaline washing water treatment unit, wherein the ternary alkaline washing water is obtained by reacting the ternary solution, separating solid from liquid, washing once and washing twice, and is characterized in that: include: Precision filtration component, used to filter the ternary alkaline washing water and output the filtrate with SS content ≤ 0.2mg / L; A first nanofiltration component (121) is used to concentrate and separate the sodium sulfate in the filtrate and output a first produced water with a sodium sulfate content of ≤5 g / L and a first concentrated water with a sodium sulfate content of ≥90 g / L; The second nanofiltration component (131) is used to concentrate and separate the sodium sulfate in the first produced water and output second produced water with a sodium sulfate content of ≤0.5 g / L and second concentrated water with a sodium sulfate content of ≥16 g / L.
2. The ternary alkaline washing water treatment unit according to claim 1, characterized in that: It also includes a raw water tank (140) for storing ternary alkaline washing water.
3. The ternary alkaline washing water treatment unit according to claim 1, characterized in that: The precision filtration component comprises a precision filter (111), a filtrate storage tank (112) for storing filtrate output by the precision filter (111), and a filter residue storage tank (113) for storing filter residue output by the precision filter (111).
4. The ternary alkaline washing water treatment unit according to claim 3, characterized in that: Also included is a filter press (114) for performing filter press treatment on the filter residue.
5. The ternary alkaline washing water treatment unit according to claim 1, characterized in that: The first nanofiltration component (121) comprises a first nanofiltration component (121), a first storage tank (122) for storing first produced water output by the first nanofiltration component (121), and a second storage tank (123) for storing first concentrated water output by the first nanofiltration component (121).
6. The ternary alkaline washing water treatment unit according to claim 1, characterized in that: The second nanofiltration component (131) comprises a second nanofiltration component (131), a third storage tank (132) for storing second produced water output by the second nanofiltration component (131), and a fourth storage tank (133) for storing second concentrated water output by the second nanofiltration component (131).
7. The ternary alkaline washing water treatment unit according to claim 6, characterized in that: It also includes a first return pipe (150) for returning the second concentrated water in the fourth storage tank (133) to the first nanofiltration component (121).
8. Production system of ternary precursor materials, including: A reaction unit (200) is used to cause the ternary solution to undergo a coprecipitation reaction to generate a solid-liquid mixture; A solid-liquid separation unit (400) is used to perform solid-liquid separation on the solid-liquid mixture and output a first solid and a ternary mother liquid; A first washing unit (500) is used to wash the first solid and output a second solid and ternary washing water; A second washing unit (600) is used to wash the second solid and output a ternary precursor material and ternary alkaline washing water; Features: It also includes the ternary alkaline washing water treatment unit (100) as described in any one of claims 1 to 7.
9. The production system of the ternary precursor material according to claim 8, characterized in that: Also included is a second return pipe (152) for returning the second produced water to the second washing unit (600).
10. The production system of the ternary precursor material according to claim 8, characterized in that: It also includes a regulating tank for storing ternary mother liquor, ternary wash water and the first concentrated water.