CN117658179A - Method for recycling alkali-reducing washing water lithium of lithium battery anode material - Google Patents
Method for recycling alkali-reducing washing water lithium of lithium battery anode material Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000005406 washing Methods 0.000 title claims abstract description 26
- 239000010405 anode material Substances 0.000 title claims abstract description 10
- 238000004064 recycling Methods 0.000 title abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 37
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 23
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 19
- 239000012452 mother liquor Substances 0.000 claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000008020 evaporation Effects 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- PQVSTLUFSYVLTO-UHFFFAOYSA-N ethyl n-ethoxycarbonylcarbamate Chemical compound CCOC(=O)NC(=O)OCC PQVSTLUFSYVLTO-UHFFFAOYSA-N 0.000 claims abstract description 12
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium hydroxide monohydrate Substances [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 claims abstract description 12
- 229940040692 lithium hydroxide monohydrate Drugs 0.000 claims abstract description 12
- 230000020477 pH reduction Effects 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 8
- 238000002425 crystallisation Methods 0.000 claims abstract description 7
- 230000008025 crystallization Effects 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 62
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000010413 mother solution Substances 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-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
- 239000000463 material Substances 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 7
- 239000010406 cathode material Substances 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000000909 electrodialysis Methods 0.000 claims description 3
- 238000005342 ion exchange Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 12
- 150000001450 anions Chemical class 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 2
- 125000000129 anionic group Chemical group 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000003203 everyday effect Effects 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 description 4
- 235000011152 sodium sulphate Nutrition 0.000 description 4
- 239000010446 mirabilite Substances 0.000 description 3
- -1 Li + Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010936 aqueous wash Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
- Battery Electrode And Active Subsutance (AREA)
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Abstract
The invention discloses a method for recovering alkaline washing water lithium of a lithium battery anode material, which comprises a weight removal step, an acid adjustment step, a concentration step, a lithium precipitation step, an acidification step, a refining step and a mother liquor acidification step; the alkali-reducing washing water contains a large amount of CO3 2‑ Ion and Li + Meanwhile, the direct evaporation crystallization or film concentration process is avoided, and the anionic carbonate is converted into anions in other forms (such as sulfate radical and chloride radical), so that Li+ and the anions can form a solution with higher solubility, and then evaporation concentration is carried out; and (3) carrying out lithium precipitation reaction on the concentrated lithium-containing solution to obtain lithium carbonate crystals, and refining the lithium carbonate crystals to obtain the lithium hydroxide monohydrate raw material required by lithium battery anode material manufacturers. The invention not only avoids the defect that the lithium carbonate is easy to form a scale layer by evaporation and crystallization in the prior art, and cleans the pipe blockage every day, but also removes impurities in the water washing liquid to extract clean lithium hydroxide monohydrate as the front partThe important raw materials realize the recycling of the ternary lithium ion anode material in the manufacturing plant, reduce the purchase quantity of raw materials and realize the recycling of wastewater.
Description
Technical Field
The invention relates to the technical field of lithium battery anode material alkali-reducing washing water recovery lithium, in particular to a method for treating wastewater generated by an alkali-reducing process on the surfaces of a ternary material of a lithium battery and a high-nickel ternary material and recovering lithium resources in the wastewater.
Background
In order to improve the safety of the ternary materials of the lithium battery and the high-nickel ternary materials, the residual alkali amount on the surface of the ternary materials is reduced by adopting a water washing mode.
Washing with water to reduce alkali can produceWaste liquid containing a large amount of Li + 、OH - 、CO3 2- 、SO4 2- (or/and Cl) - ) And Ni, co, mn and the like, and the waste liquid can reach the standard and be discharged after being treated.
Treatment of wastewater is an energy-consuming process that increases processing costs. If the lithium resource in the wastewater can be recovered when the wastewater is treated, the wastewater is made into a product, and considerable economic value can be brought.
CN109713228A discloses a recyclable water washing alkali-reducing method for ternary materials of lithium ion batteries, which is used for recovering lithium in wastewater from water washing liquid through a filtering and evaporating device. The water washing liquid generated in the process of washing the ternary material to reduce alkali contains a large amount of impurity ions, mainly Li + 、OH - 、CO3 2- 、SO4 2- (or/and Cl) - ) Ni, co, mn, etc.; the solution is filtered and re-evaporated, and as the water washing liquid contains more lithium carbonate, the solubility of the lithium carbonate is reduced along with the temperature rise, the lithium carbonate is easy to precipitate in the process of evaporating and losing water, and as the metastable area of the lithium carbonate crystal is relatively narrow (as reported in literature, the solubility and super-solubility of the lithium carbonate in water are measured and analyzed thermodynamically, song Chang and the like), the lithium carbonate is easy to burst and nucleate after being slightly overheated in the evaporation process, scale is easy to form in equipment, and the smooth proceeding of the evaporation process is seriously influenced.
If the solution is not evaporated, membrane concentration is used, after concentration is 1-5 times, lithium carbonate is saturated and separated out, membrane holes are blocked, and membrane components are paralyzed or the cleaning cycle is too frequent.
Therefore, how to solve the problem of pipe blockage or membrane hole blockage caused by precipitation of lithium carbonate in the prior art and how to solve the problem of recovering clean lithium resources becomes a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for recovering lithium from alkaline washing water of a lithium battery positive electrode material, which not only performs purification treatment on waste water to obtain clean water for reuse, but also extracts lithium from the waste water, and the obtained lithium product is one of raw materials before sintering of a ternary lithium ion positive electrode material, namely lithium hydroxide monohydrate. The lithium hydroxide monohydrate is used as an important raw material in the former way, so that the recycling of the ternary lithium ion cathode material in a manufacturing plant is realized, the purchase quantity of raw materials is reduced, and the recycling of wastewater is realized.
In order to achieve the aim, the invention discloses a method for recovering alkaline washing water lithium of a lithium battery anode material, which comprises a weight removal step, an acid adjustment step, a concentration step, a lithium precipitation step, an acidification step, a refining step and a mother liquor acidification step.
The weight removal step comprises treating the aqueous washing solution by methods including but not limited to electrodialysis, adsorption, ion exchange, precipitation and the like, and adopting one or a combination of methods to obtain the lithium-containing solution 1.
The acid conditioning step comprises adding an acid solution including but not limited to sulfuric acid, hydrochloric acid, nitric acid, citric acid and the like into the lithium-containing solution 1, and then removing carbon dioxide to obtain a lithium-containing solution 2.
The concentration step includes treating the lithium-containing solution 2 by a concentration method including but not limited to a membrane, evaporation, or the like, or a combination method, and controlling the concentration of lithium ions to 20-30g/L to obtain a lithium-containing solution 3.
The lithium depositing step comprises the steps of introducing sodium carbonate solution into the lithium-containing solution 3, wherein the adding amount of the sodium carbonate solution is according to the molar concentration ratio [ CO3 ] 2- ]：[Li + ]Less than or equal to 0.55:1, carrying out lithium precipitation reaction to obtain lithium carbonate crystals and a lithium precipitation mother solution 1.
The acidification step includes dissolving the lithium carbonate crystals with an acid solution including, but not limited to, sulfuric acid, hydrochloric acid, nitric acid, citric acid, etc., to obtain a lithium-containing solution 4.
The refining step comprises the steps of reacting the lithium-containing solution 4 with a sodium hydroxide solution to generate lithium hydroxide, evaporating and crystallizing to obtain a lithium hydroxide monohydrate crystal, drying, crushing and packaging to obtain a high-purity lithium hydroxide product, and returning to the front-end process to be used as one of raw materials for synthesizing ternary materials.
The mother solution acidification step comprises the step of acidizing the lithium precipitation mother solution 1 obtained by solid-liquid separation in the lithium precipitation step to obtain a lithium precipitation mother solution 2, wherein the flow accounting for 0-100% of the total mass percent of the lithium precipitation mother solution 2 is combined with the lithium-containing solution 2, the solution is evaporated and concentrated, and the rest of the lithium precipitation mother solution 2 is taken as an impurity to be discharged out of the system.
Preferably, in the lithium-containing solution 1.
Li + Is of the content of Li + ≤30g/L；HO - Content of HO - ≤10 g/L ；CO3 2- Is CO3 content 2- ≤10 g/L ；SO4 2- Is SO4 content 2- ≤10 g/L ；Cl - Is of the content of Cl - ≤10 g/L ；Ni 2+ Is Ni in the content of 2+ ≤10mg/L；Co 2 + Is Co in the content of 2+ ≤10 mg/L；Mn 2+ Is Mn in the content of 2+ ≤10 mg/L；Mg 2+ Is of the content of Mg 2+ ≤10 mg/L；Ca 2+ Is of the content of Ca 2+ ≤10 mg/L。
Preferably, in the lithium-containing solution 1.
Li + The content of Li is 1g/L less than or equal to Li + ≤5g/L；HO - Content of HO - ≤5 g/L ；CO3 2- Is CO3 content 2- ≤10 g/L ；SO4 2- Is SO4 content 2- ≤5 g/L ；Cl - Is of the content of Cl - ≤5 g/L ；Ni 2+ Is Ni in the content of 2+ ≤1mg/L；Co 2+ Is Co in the content of 2+ ≤1 mg/L；Mn 2+ Is Mn in the content of 2+ ≤1 mg/L；Mg 2+ Is of the content of Mg 2+ ≤1 mg/L；Ca 2+ Is of the content of Ca 2+ ≤1 mg/L。
Preferably, in the acid adjusting step, the pH of the reaction end point is controlled to be 7-10.
Preferably, in the lithium precipitation step, the temperature of the lithium precipitation reaction is controlled to be 60-100 ℃.
Preferably, in the acidification step, the pH of the reaction end point is controlled to be 7-12.
The technical scheme of the invention has the following advantages.
The method not only avoids the defect that a scale layer is very easy to form by evaporating and crystallizing lithium carbonate in the prior art and cleans a blocked pipe every day, but also removes impurities in the washing liquid to extract clean lithium, and the obtained lithium product is one of raw materials before sintering the ternary lithium ion anode material, namely the lithium hydroxide monohydrate. The lithium hydroxide monohydrate is used as an important raw material in the former way, so that the recycling of the ternary lithium ion cathode material in a manufacturing plant is realized, the purchase quantity of raw materials is reduced, and the recycling of wastewater is realized.
1. The invention provides a method for recycling alkaline washing water lithium of a lithium battery anode material, which avoids the situation that a large amount of CO3 is generated 2- Ion and Li + And when the solution exists, the evaporation crystallization is carried out, so that the phenomenon that the evaporation process or the membrane concentration process is prevented from being smoothly carried out is avoided. Converting anionic carbonate in the aqueous wash to other forms of anions (e.g., sulfate, chloride) to Li + And anions can constitute a solution with higher solubility, so that the lithium solution 2 with a relatively low concentration can be concentrated into the lithium-containing solution 3 with a relatively high concentration by a concentration method.
2. In order to improve the purity of the product, a weight removal step is adopted.
3. And a lithium precipitation step is adopted, lithium ions in the lithium-containing solution 3 are subjected to a lithium precipitation reaction by adding sodium carbonate, lithium carbonate crystal precipitation is obtained, the lithium carbonate crystals are directly centrifuged to obtain lithium carbonate crystals, the lithium carbonate crystals are washed by water, impurities in mother liquor and mother liquor are reduced, and impurity ions in the original solution can be left in the mother liquor in such a way to obtain clean lithium carbonate, so that the subsequent refining is facilitated, and qualified lithium products are obtained.
4. The refining step is to react the lithium-containing solution 4 with sodium hydroxide solution to obtain a solution in which lithium hydroxide and sodium sulfate coexist, and to perform salt dividing methods such as evaporation, crystallization, freezing and the like on the solution to obtain lithium hydroxide monohydrate crystals and mirabilite crystals, so that the lithium hydroxide monohydrate crystals and the mirabilite crystals are separated.
5. The lithium precipitation mother liquor 1 contains a large amount of lithium ions and impurities, the lithium ions need to be recovered to the greatest extent, and meanwhile, the impurities are discharged by discharging certain mother liquor, so that the two are balanced by adopting a mode of refluxing part of mother liquor and discharging part of mother liquor.
The conception, specific steps, and technical effects of the present invention will be further described with reference to the drawings to fully understand the objects, features, and effects of the present invention.
Fig. 1 shows a schematic process flow diagram of the present invention.
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1.
a) The water washing liquid is treated by electrodialysis, adsorption, ion exchange, precipitation and other methods to obtain lithium-containing solution 1 with the quality index of Li + ：3g/L，HO - ：2g/L，CO3 2- ≤7g/L，SO4 2- ：2.5g/L，Cl - ：0.5g/L，Ni 2+ ：0.5mg/L，Co 2+ ：0.5mg/L，Mn 2+ ：0.5mg/L，Mg 2+ ：1mg/L，Ca 2+ ：1mg/L。
b) Adding the lithium-containing solution 1 into a sulfuric acid solution, and adjusting the pH to 7; and then decarbonating to obtain a lithium-containing solution 2.
c) The lithium-containing solution 2 was concentrated by evaporation to control the lithium ion concentration to 25g/L, thereby obtaining a lithium-containing solution 3.
d) Introducing sodium carbonate solution into the lithium-containing solution 3, controlling the feeding concentration of sodium carbonate to be 200g/L, and adding the sodium carbonate solution according to the molar concentration ratio [ CO3 ] 2- ]：[Li + ]Less than or equal to 0.55: and 1, carrying out lithium precipitation reaction at 90 ℃ and carrying out solid-liquid separation to obtain lithium carbonate crystals and lithium precipitation mother liquor 1.
e) The lithium carbonate crystal was dissolved in a sulfuric acid solution, and the pH at the end of the reaction was controlled to be 10 to obtain a lithium-containing solution 4.
f) Adding 32% sodium hydroxide solution into the lithium-containing solution 4, performing double decomposition reaction to generate lithium hydroxide and sodium sulfate solution, performing high-temperature evaporation crystallization to obtain lithium hydroxide monohydrate crystal and mother solution containing sodium sulfate, performing solid-liquid separation, drying, crushing and packaging the lithium hydroxide monohydrate crystal, and returning to the front-end process to be used as one of raw materials for synthesizing ternary materials; and (3) separating out mirabilite from the mother solution containing sodium sulfate through freezing crystallization.
g) Adding sulfuric acid solution into the lithium precipitation mother solution 1, adjusting the pH to 7, performing acidification treatment to obtain a lithium precipitation mother solution 2, combining the lithium precipitation mother solution 2 with the total mass percent of 80% with the lithium-containing solution 2, evaporating and concentrating, and discharging the rest of the lithium precipitation mother solution 2 as impurities from the system.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (6)
1. The method for recovering the alkaline washing water lithium of the lithium battery anode material comprises a weight removal step, an acid regulation step, a concentration step, a lithium precipitation step, an acidification step, a refining step and a mother liquor acidification step;
the weight removing step S1 comprises the steps of treating the water washing liquid by adopting methods including but not limited to electrodialysis, adsorption, ion exchange, precipitation and the like, and adopting one or a combination of a plurality of methods to obtain a lithium-containing solution 1;
the acid regulating step S2 comprises the steps of adding acid solutions including but not limited to sulfuric acid, hydrochloric acid, nitric acid, citric acid and the like into the lithium-containing solution 1, and removing carbon dioxide to obtain a lithium-containing solution 2;
the concentration step S3 comprises the steps of treating the lithium-containing solution 2 through a concentration method including but not limited to a membrane, evaporation and the like or a combination method, and controlling the concentration of lithium ions to be 20-30g/L to obtain a lithium-containing solution 3;
the lithium precipitation step S4 comprises the steps of introducing sodium carbonate solution into the lithium-containing solution 3, wherein the adding amount of the sodium carbonate solution is according to the molar concentration ratio [ CO3 ] 2- ]：[Li + ]Less than or equal to 0.55:1, carrying out a lithium precipitation reaction to obtain lithium carbonate crystals and a lithium precipitation mother solution 1;
the acidification step S5 comprises dissolving lithium carbonate crystal with acid solution including but not limited to sulfuric acid, hydrochloric acid, nitric acid, citric acid, etc. to obtain lithium-containing solution 4;
the refining step S6 comprises the steps of reacting the lithium-containing solution 4 with sodium hydroxide solution to generate lithium hydroxide, adopting evaporation crystallization to obtain lithium hydroxide monohydrate crystal, drying, crushing and packaging to obtain a high-purity lithium hydroxide product, and returning to the front-end process to be used as one of raw materials for synthesizing ternary materials;
and 7, acidizing the lithium precipitation mother liquor 1 obtained by solid-liquid separation in the lithium precipitation step to obtain a lithium precipitation mother liquor 2, combining the lithium precipitation mother liquor 2 with the flow accounting for 0-100% of the total mass percent of the lithium precipitation mother liquor 2, evaporating and concentrating, and discharging the rest of the lithium precipitation mother liquor 2 as impurities out of the system.
2. The method for recovering the lithium battery cathode material alkali-reducing washing water lithium according to claim 1, wherein the lithium-containing solution 1 comprises the following steps:
Li + is of the content of Li + ≤30g/L；
HO - Content of HO - ≤10 g/L ；
CO3 2- Is CO3 content 2- ≤10 g/L ；
SO4 2- Is SO4 content 2- ≤10 g/L ；
Cl - Is of the content of Cl - ≤10 g/L ；
Ni 2+ Is Ni in the content of 2+ ≤10mg/L；
Co 2+ Is Co in the content of 2+ ≤10 mg/L；
Mn 2+ Is Mn in the content of 2+ ≤10 mg/L；
Mg 2+ Is of the content of Mg 2+ ≤10 mg/L；
Ca 2+ Is of the content of Ca 2+ ≤10 mg/L。
3. The method for recovering the lithium battery cathode material alkali-reducing washing water lithium according to claim 2, wherein the lithium-containing solution 1 comprises the following steps:
Li + the content of Li is 1g/L less than or equal to Li + ≤5g/L；
HO - Content of HO - ≤5 g/L ；
CO3 2- Is CO3 content 2- ≤10 g/L ；
SO4 2- Is SO4 content 2- ≤5 g/L ；
Cl - Is of the content of Cl - ≤5 g/L ；
Ni 2+ Is Ni in the content of 2+ ≤1mg/L；
Co 2+ Is Co in the content of 2+ ≤1 mg/L；
Mn 2+ Is Mn in the content of 2+ ≤1 mg/L；
Mg 2+ Is of the content of Mg 2+ ≤1 mg/L；
Ca 2+ Is of the content of Ca 2+ ≤1 mg/L。
4. The method for recovering lithium-ion battery cathode material alkali-reducing washing water according to claim 1, wherein in the acid adjusting step S2, the pH of the reaction end point is controlled to be 7-10.
5. The method for recovering alkaline washing water lithium of the positive electrode material of the lithium battery according to claim 1, wherein in the step S4 of precipitating lithium, the temperature of the lithium precipitation reaction is controlled to be 60-100 ℃.
6. The method for recovering lithium-ion battery cathode material alkali-reduced washing water according to claim 1, wherein in the acidification step S5, the pH at the end of the reaction is controlled to be 7-12.
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