CN111170342A - Preparation method of battery-grade anhydrous lithium hydroxide - Google Patents
Preparation method of battery-grade anhydrous lithium hydroxide Download PDFInfo
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Abstract
The invention discloses a preparation method of battery-grade anhydrous lithium hydroxide, which takes industrial-grade lithium hydroxide monohydrate as a raw material and comprises the following preparation steps: dissolving, ultrafiltering, adsorbing, recrystallizing, airflow crushing, vacuum drying, electromagnetic iron removal, vacuum packaging and the like to finally obtain the battery-grade anhydrous lithium hydroxide. The process is simple and has strong operability, the added value of the product is greatly improved, and the economic benefit and the social benefit of the product are increased.
Description
Technical Field
The invention relates to the field of chemical production of lithium hydroxide, in particular to a preparation method of battery-grade anhydrous lithium hydroxide.
Background
Lithium carbonate and lithium hydroxide are important raw materials for synthesizing the high-energy-density ternary cathode material, but the lithium carbonate and the lithium hydroxide are used for preparing the high-nickel ternary material and have various defects. When lithium carbonate is used as a raw material, the temperature of the high-nickel ternary material cannot be higher than 800 ℃ during sintering, the lithium carbonate is incompletely decomposed due to the excessively low sintering temperature, the alkalinity is enhanced, and meanwhile, the lithium source loss is caused, and the battery performance is influenced. When lithium hydroxide monohydrate is used as a raw material, the lithium hydroxide is subjected to friction heat release in the process of mixing with a high-nickel ternary precursor to generate dehydration, so that part of lithium hydroxide is agglomerated to influence the performance of the material. The battery-grade anhydrous lithium hydroxide can effectively avoid the defects of lithium carbonate and the anhydrous lithium hydroxide and improve the performance of the ternary cathode material. With the development speed of the high-nickel ternary cathode material being increased continuously, the high-nickel ternary material is applied to the power battery in a large scale, and the demand of battery-grade anhydrous lithium hydroxide is increased continuously.
The anhydrous LiOH is white tetragonal crystalline particles or flowable powder with a relative density of 1.45g/cm3, a melting point of 471.2 ℃ and a boiling point of 1620 ℃. LiOH is soluble in water, slightly soluble in alcohol, and readily absorbs CO2 and H2O in air. It can be used for preparing lithium salt and lithium base lubricating grease, electrolyte of alkaline accumulator, lithium bromide refrigerator absorption liquid, lithium soap (lithium soap), lithium salt and developing solution, etc. or used as analytical reagent, etc. Lithium hydroxide currently on the market is mostly supplied in the form of a hydrate, such as lithium hydroxide monohydrate. Anhydrous lithium hydroxide products for battery grade are rare due to the hygroscopic nature of lithium hydroxide, which also reacts readily with carbon dioxide in the air. In the current literature and patents, the methods for producing anhydrous LiOH on a large scale are mainly: in JP-a 2011-178584, batch processes under vacuum are disclosed, requiring a residence time of at least two hours to limit the space velocity. In JP-A2006-265023, a process is disclosed in which lithium hydroxide hydrate is dehydrated in a rotary kiln. The Pasf company of America introduces a method for removing water by keeping lithium hydroxide particles for 0.5-20 s through high-temperature air flow at 150-500 ℃. Because lithium hydroxide has strong corrosivity, the disclosed method is easy to cause strong abrasion in a drying kiln, and new impurities are easy to introduce in the drying process, so that the purity of anhydrous lithium hydroxide is not high, and the method cannot be used for synthesizing a ternary cathode material.
The anhydrous lithium hydroxide on the market at present has the following problems: 1. the presence of the magnetic substances, which are too high and contain magnetic metal impurities in the lithium ion battery anode material, can not only reduce the specific capacity and energy density of the material, but also reduce the service life, consistency and safety performance of the battery. At present, the highest requirement of battery-grade anhydrous lithium hydroxide magnetic substances for international battery manufacturers such as samsung and loose battery manufacturers is 0.00001%, and the anhydrous lithium hydroxide magnetic substances in the market reach more than 0.00005% and far reach the requirement because the existing process generally has no means for removing the magnetic substances. 2. The CO2 and the moisture are too high, and the main content quality of the product is greatly influenced because the optimization of air carbonization and drying modes is not considered. 3. The impurity ions are too high, particularly the content of Si, and because the lithium hydroxide production system is produced under strong alkali, the silicon removal is difficult, and no report exists on a silicon removal method in the production process of anhydrous lithium hydroxide.
Therefore, how to design a preparation method of battery-grade anhydrous lithium hydroxide, which takes industrial-grade lithium hydroxide monohydrate as a raw material, has simple process and strong operability, greatly improves the added value of products, and increases the economic benefit and the social benefit of the products.
Disclosure of Invention
In order to solve the problems, the invention provides a technical scheme for producing battery-grade anhydrous lithium hydroxide. As the standard of anhydrous lithium hydroxide does not exist in China, the corresponding indexes of the highest-grade product according to the national standard of Battery-grade lithium hydroxide monohydrate (GB/T26008-2010) are taken as references. The anhydrous lithium hydroxide prepared by the method meets the requirements that the main content (LiOH) is more than or equal to 99.00 percent, the content of sodium (Na) is less than or equal to 0.005 percent, the content of potassium (K) is less than or equal to 0.003 percent, the content of Fe is less than or equal to 0.0007 percent, the content of Ca is less than or equal to 0.002 percent, the content of Cu is less than or equal to 0.0001 percent, the content of Mn is less than or equal to 0.001 percent, the content of Mg is less than or equal to 0.001 percent, the content of Si is less than or equal to 0.005 percent, the content of Cl is less than or equal to 0.002 percent, the content of SO42 is less than or equal to. The requirement of battery-grade anhydrous lithium hydroxide is met. The industrial grade lithium hydroxide monohydrate is used as a raw material, the process is simple and has strong operability, the added value of the product is greatly improved, and the economic benefit and the social benefit of the product are increased.
In order to solve the defects in the prior art, the invention provides a preparation method of battery-grade anhydrous lithium hydroxide, which comprises the following steps:
step S101, dissolving, namely adding ultrapure water into industrial grade lithium hydroxide monohydrate to stir and completely dissolve, and preparing a lithium hydroxide aqueous solution;
step S102, filtering by using an ultrafiltration membrane, namely filtering and removing impurities from the lithium hydroxide solution by using the ultrafiltration membrane;
step S103, removing impurities by resin adsorption, namely adsorbing and removing impurities from the leaching solution by chelating resin and strong-base anion resin respectively;
step S104, recrystallizing, namely evaporating and crystallizing the LiOH solution by using an MVR forced circulation evaporation crystallization technology to separate out lithium hydroxide crystals;
step S105, performing jet milling, namely performing jet milling on the recrystallized solid obtained in the step S104 to obtain micro powder with the average particle size (D50) of 10-50 um;
step S106, vacuum drying and dehydrating, and performing vacuum drying by adopting a double-cone rotary vacuum dryer;
step S107, performing electromagnetic iron removal, namely performing electromagnetic iron removal on the dry powder in the step S106 by using an electromagnetic iron remover;
and S108, carrying out vacuum packaging, and packaging the product by adopting an automatic vacuum packaging machine to finally obtain the battery-grade anhydrous lithium hydroxide product.
Further, in the step S101, a lithium hydroxide solution is prepared with a concentration of 10-20%.
Further, the surface aperture of the ultrafiltration membrane in the step S102 is 20-50 nm, and insoluble impurities such as colloidal silica, CO2, magnetic foreign matters and the like are mainly removed through ultrafiltration.
Further, in step S103, the chelating resin adsorbs and removes ionic silicon in the solution, and the strong-base anion adsorbs and removes Mg2+, Ca2+, and the like in the solution.
Further, in the step S104, the MVR forced circulation evaporative crystallization technology uses a low-temperature and low-pressure steaming technology and clean energy as energy sources to generate steam, so as to separate water from the medium.
Further, the air flow used in step S105 is pretreated to remove water vapor and carbon dioxide, so that the lithium hydroxide is prevented from absorbing carbon dioxide during the pulverization process, and part of the lithium hydroxide is converted into lithium carbonate.
Further, the lithium hydroxide D50 recrystallized in the step S105 is 100-5 mm, and the particle size is 10-50 um after jet milling.
Further, the double-cone rotary vacuum drying machine adopted in step S106 is a dynamic vacuum drying method.
Further, in the step S106, the drying temperature is set to be 120-220 ℃, and the drying time is 1-5 hours.
Further, in the step S107, the electromagnetic iron remover adopts a mesh-shaped magnetic network, and the magnetic field intensity is set to 8000-15000 GS.
Further, the vacuum drying in step S108 is performed in an isolated room drying room.
The design key point of the invention is that the industrial grade lithium hydroxide monohydrate is used as the raw material, the process is simple and has strong operability, the added value of the product is greatly improved, and the economic benefit and the social benefit of the product are increased.
Compared with the prior art, the method has the following advantages:
1. since the lithium hydroxide production system is carried out in a strongly alkaline environment, silicon as an impurity in the product tends to be difficult to remove. The silicon impurity in lithium hydroxide exists mainly in two forms, including macromolecular colloidal silica and ionic silicon. In the method, firstly, the colloidal silicon is removed by adopting an ultrafiltration mode, and then the ion silicon in the product is removed by adsorbing with chelating resin. Under the combined action of the two modes, more than 95% of impurity silicon in the lithium hydroxide can be removed, and the product can meet the requirement of the market on the impurity silicon in the battery-grade lithium hydroxide. At present, no report of a method for removing silicon by anhydrous lithium hydroxide exists, and the novelty and the practicability of the invention are reflected.
2. The air flow in the air flow crushing is subjected to pre-adsorption treatment to remove water vapor and carbon dioxide in the air flow, so that the lithium hydroxide is prevented from contacting with the carbon dioxide in the crushing process. The jet milling belongs to superfine milling, and can grind the lithium hydroxide D50 to 10-50 um. The lithium hydroxide micro powder has smaller particles, narrower and more uniform particle size distribution, can increase the contact area and is convenient to dry.
3. Because the lithium hydroxide particles obtained by recrystallization are larger, the drying area of the lithium hydroxide can be enlarged by adopting a method of crushing firstly and then drying, so that the lithium hydroxide is dried more fully, the drying time is shortened, the energy is saved, the efficiency is improved, and the practicability of the invention is embodied.
4. Because of high moisture content in the drying process of the lithium hydroxide monohydrate, the evaporated water vapor in the drying process can dissolve the lithium hydroxide to cause the phenomenon of adhesion and plate bonding, and simultaneously, carbon dioxide in the air can react with the lithium hydroxide to carbonize the lithium hydroxide. The double-cone rotary vacuum dryer can avoid the hardening phenomenon in the drying process, and simultaneously isolate air to achieve the effect of dynamic vacuum drying.
5. The magnetic substance is an important impurity index of battery-grade lithium hydroxide, and the existence of the magnetic substance can reduce the specific capacity and energy density of the material, so that the service life, consistency and safety performance of the battery are reduced. The method adopts two modes to remove magnetic substances, including solution iron removal and solid iron removal. Wherein the ultrafiltration membrane is used for removing iron from the solution and removing magnetic substances with the particle size of more than 0.01 um. The common methods for removing iron from solids include permanent-magnet iron removers and electromagnetic iron removers. Because the lithium hydroxide solid has corrosiveness and strong pungent smell, if the solid permanent magnet iron remover is selected, the defects of poor iron removal effect, poor field environment and the like exist. The adoption of the electromagnetic iron remover can reduce the magnetic substance of the anhydrous lithium hydroxide to be less than 0.000005 percent, the iron removal effect is better than that of a solid permanent magnet iron remover, the requirement of battery manufacturers on the magnetic substance of the lithium hydroxide in the world is met, and meanwhile, the iron can be automatically discharged for recycling, so that the iron removal effect and the field production environment are ensured.
6. The method adopts different modes of ultrafiltration membrane filtration, strong alkaline anion adsorption, electromagnetic iron removal and the like to remove impurities, and can effectively remove impurities such as Ca, Mg, Si, Fe, organic matters, insoluble substances, magnetic substances and the like in the lithium hydroxide, SO that the content of a final product meets the requirements that (LiOH) is more than or equal to 99.00 percent, Na is less than or equal to 0.005 percent, K is less than or equal to 0.003 percent, Fe is less than or equal to 0.0007 percent, Ca is less than or equal to 0.002 percent, Cu is less than or equal to 0.0001 percent, Mn is less than or equal to 0.001 percent, Mg is less than or equal to 0.001 percent, Si is less than or equal to 0.005 percent, Cl is less than or equal to 0.002 percent, SO42 is less than or equal to 0.008 percent, CO 35. The standard of battery-grade lithium hydroxide is achieved. At present, no anhydrous lithium hydroxide product which can reach the standard exists in China, and the creativity of the invention is reflected.
7. The processes of crushing, drying, iron removal, packaging and the like in the method are all finished in a vacuum environment or in the presence of pretreated air, so that the lithium hydroxide is prevented from absorbing water vapor and carbon dioxide in the air to deteriorate in the whole process. The indexes of the anhydrous lithium hydroxide obtained by the method, such as main content, impurities and the like, are obviously superior to those of common anhydrous lithium hydroxide on the market, and can reach the standard of battery grade.
Drawings
FIG. 1 is a flow chart of the preparation of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the present invention provides a method for preparing battery-grade anhydrous lithium hydroxide, comprising:
step S101, dissolving, namely adding ultrapure water into industrial grade lithium hydroxide monohydrate to stir and completely dissolve, and preparing a lithium hydroxide aqueous solution;
step S102, filtering by using an ultrafiltration membrane, namely filtering and removing impurities from the lithium hydroxide solution by using the ultrafiltration membrane;
step S103, removing impurities by resin adsorption, namely adsorbing and removing impurities from the leaching solution by chelating resin and strong-base anion resin respectively;
step S104, recrystallizing, namely evaporating and crystallizing the LiOH solution by using an MVR forced circulation evaporation crystallization technology to separate out lithium hydroxide crystals;
step S105, performing jet milling, namely performing jet milling on the recrystallized solid obtained in the step S104 to obtain micro powder with the average particle size (D50) of 10-50 um;
step S106, vacuum drying and dehydrating, and performing vacuum drying by adopting a double-cone rotary vacuum dryer;
step S107, performing electromagnetic iron removal, namely performing electromagnetic iron removal on the dry powder in the step S106 by using an electromagnetic iron remover;
and S108, carrying out vacuum packaging, and packaging the product by adopting an automatic vacuum packaging machine to finally obtain the battery-grade anhydrous lithium hydroxide product.
Example 1:
dissolving 100kg of industrial grade lithium hydroxide monohydrate in 1000L of pure water, stirring and dissolving, filtering by an ultrafiltration membrane, and removing impurities by chelating resin and strong-base anion adsorption. After forced circulation of MVR evaporation and recrystallization, 93kg of refined lithium hydroxide monohydrate with a D50 value of 1.8mm is obtained. And (3) adopting pretreatment air airflow for crushing. Obtaining lithium hydroxide monohydrate with D50 of 40um, vacuum drying for 3h at 150 ℃, and removing iron by adopting an electromagnetic iron remover to select a net-shaped magnetic net under the magnetic field intensity of 12000 GS. Finally obtaining the anhydrous lithium hydroxide product.
Example 2:
dissolving 120kg of industrial grade lithium hydroxide monohydrate in 1000L of pure water, stirring and dissolving, filtering by an ultrafiltration membrane, and adsorbing and removing impurities by strong alkaline ions. The refined lithium hydroxide monohydrate of 110kg is obtained after forced circulation, evaporation and recrystallization by MVR, and the D50 is 2.1 mm. And (3) adopting pretreatment air airflow for crushing. And (3) obtaining the lithium hydroxide monohydrate with the D50 of 33um, drying for 2h in vacuum at 160 ℃, and removing iron by adopting an electromagnetic iron remover to select a net-shaped magnetic net under the magnetic field intensity of 10000 GS. Finally obtaining the anhydrous lithium hydroxide product.
Example 3:
dissolving 250kg of industrial grade lithium hydroxide monohydrate in 2000L of pure water, stirring and dissolving, filtering by an ultrafiltration membrane, and adsorbing and removing impurities by strong alkaline ions. After forced circulation of MVR evaporation and recrystallization, 220kg of refined lithium hydroxide monohydrate with a D50 value of 1.5mm is obtained. And (3) adopting pretreatment air airflow for crushing. Obtaining the lithium hydroxide monohydrate with D50 of 25um, vacuum drying for 4h at 180 ℃, and removing iron by adopting an electromagnetic iron remover to select a net-shaped magnetic net under the magnetic field intensity of 12000 GS. Finally obtaining the anhydrous lithium hydroxide product.
Example 4
Dissolving 250kg of industrial grade lithium hydroxide monohydrate in 2000L of pure water, stirring and dissolving, filtering by an ultrafiltration membrane, and adsorbing and removing impurities by strong alkaline ions. After forced circulation of MVR evaporation and recrystallization, 217kg of refined lithium hydroxide monohydrate with a D50 value of 1.2mm is obtained. And (3) adopting pretreatment air airflow for crushing. Obtaining the lithium hydroxide monohydrate with D50 of 22um, carrying out vacuum drying for 2.5h at 120 ℃, and removing iron by adopting an electromagnetic iron remover to select a net-shaped magnetic net under the magnetic field intensity of 10000 GS. Finally obtaining the anhydrous lithium hydroxide product.
Example 5
200kg of industrial grade lithium hydroxide monohydrate is dissolved in 2000L of pure water, stirred and dissolved, filtered by an ultrafiltration membrane, and then adsorbed by strong alkaline ions to remove impurities. After forced circulation evaporation recrystallization by MVR, 173kg of refined lithium hydroxide monohydrate with a D50 value of 1.2mm was obtained. And (3) adopting pretreatment air airflow for crushing. Obtaining the lithium hydroxide monohydrate with D50 of 30um, carrying out vacuum drying for 3h at 200 ℃, and removing iron by adopting an electromagnetic iron remover to select a net-shaped magnetic net under the magnetic field intensity of 12000 GS. Finally obtaining the anhydrous lithium hydroxide product.
The key node control conditions of the above embodiments 1 to 5 are summarized as follows:
| recrystallization D50mm | D50/um after crushing | Drying temperature/. degree.C | Drying time/h | Magnetic field strength/GS | |
| Example 1 | 1.8 | 40 | 150 | 3 | 12000 |
| Example 2 | 2.1 | 33 | 160 | 2 | 10000 |
| Embodiment 3 | 1.5 | 25 | 180 | 4 | 12000 |
| Example 4 | 1.2 | 22 | 120 | 2.5 | 10000 |
| Example 5 | 1.2 | 30 | 200 | 3 | 12000 |
The product component analysis results in the embodiment 1-3 are as follows: (quantitative ratio of substances)
| Example 1 | Example 2 | Embodiment 3 | Example 4 | Example 5 | Reference standard | |
| LiOH | 99.30% | 99.10% | 99.00% | 99.10% | 99.20% | 99.000% |
| Na | 0.003% | 0.004% | 0.003% | 0.004% | 0.004% | 0.005% |
| K | 0.003% | 0.002% | 0.002% | 0.002% | 0.002% | 0.003% |
| Fe | 0.0006% | 0.0005% | 0.0006% | 0.0007% | 0.0006% | 0.0007% |
| Ca | 0.002% | 0.001% | 0.002% | 0.002% | 0.001% | 0.002% |
| Cu | 0.0001% | 0.0001% | 0.0001% | 0.0001% | 0.0001% | 0.0001% |
| Mn | 0.001% | 0.001% | 0.001% | 0.001% | 0.001% | 0.001% |
| Mg | 0.001% | 0.001% | 0.001% | 0.001% | 0.001% | 0.001% |
| Si | 0.004% | 0.005% | 0.005% | 0.003% | 0.004% | 0.005% |
| Cl- | 0.001% | 0.002% | 0.002% | 0.002% | 0.001% | 0.002% |
| SO42- | 0.007% | 0.008% | 0.005% | 0.007% | 0.006% | 0.008% |
| CO32- | 0.22% | 0.36% | 0.31% | 0.28% | 0.35% | 0.40% |
| Acid insoluble substance | 0.004% | 0.005% | 0.004% | 0.002% | 0.004% | 0.005% |
| Water insoluble substance | 0.008% | 0.006% | 0.009% | 0.007% | 0.007% | 0.010% |
| Magnetic substance | 0.000002% | 0.000004% | 0.000003% | 0.000004% | 0.000004% | 0.000005% |
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the patent and protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A preparation method of battery-grade anhydrous lithium hydroxide is characterized by comprising the following steps:
step S101, dissolving, namely adding ultrapure water into industrial grade lithium hydroxide monohydrate to stir and completely dissolve, and preparing a lithium hydroxide aqueous solution;
step S102, filtering by using an ultrafiltration membrane, namely filtering and removing impurities from the lithium hydroxide solution by using the ultrafiltration membrane;
step S103, removing impurities by resin adsorption, namely adsorbing and removing impurities from the leaching solution by chelating resin and strong-base anion resin respectively;
step S104, recrystallizing, namely evaporating and crystallizing the LiOH solution by using an MVR forced circulation evaporation crystallization technology to separate out lithium hydroxide crystals;
step S105, performing jet milling, namely performing jet milling on the recrystallized solid obtained in the step S104 to obtain micro powder with the average particle size (D50) of 10-50 um;
step S106, vacuum drying and dehydrating, and performing vacuum drying by adopting a double-cone rotary vacuum dryer;
step S107, performing electromagnetic iron removal, namely performing electromagnetic iron removal on the dry powder in the step S106 by using an electromagnetic iron remover;
and S108, carrying out vacuum packaging, and packaging the product by adopting an automatic vacuum packaging machine to finally obtain the battery-grade anhydrous lithium hydroxide product.
2. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: in the step S101, a lithium hydroxide solution is prepared, wherein the concentration of the lithium hydroxide solution is 10-20%.
3. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: in the step S102, the surface aperture of the ultrafiltration membrane is 20-50 nm, and insoluble impurities such as colloidal silica, CO2, magnetic foreign matters and the like are mainly removed by ultrafiltration.
4. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: in step S103, the chelating resin adsorbs and removes ionic silicon in the solution, and the strong-base anion adsorbs and removes ions such as Mg2+, Ca2+, and the like in the solution.
5. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: in the step S104, the MVR forced circulation evaporation crystallization technology adopts a low-temperature and low-pressure steaming technology and clean energy as energy sources to generate steam, and water in the medium is separated out.
6. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: the gas flow used in step S105 is pretreated to remove water vapor and carbon dioxide, so that lithium hydroxide is prevented from absorbing carbon dioxide during the pulverization process, and part of lithium hydroxide is converted into lithium carbonate.
7. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: the lithium hydroxide D50 recrystallized in the step S105 is 100-5 mm, and the particle size of the lithium hydroxide D50 is 10-50 um after jet milling.
8. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: the double-cone rotary vacuum drying machine adopted in the step S106 is a dynamic vacuum drying method; in the step S106, the drying temperature is set to be 120-220 ℃, and the drying time is 1-5 hours.
9. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: in the step S107, the electromagnetic iron remover adopts a mesh-shaped magnetic network, and the magnetic field intensity is set to 8000-15000 GS.
10. The method of preparing battery-grade anhydrous lithium hydroxide according to claim 1, wherein: the vacuum drying in step S108 is performed in an isolated room drying room.
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| CN112939034B (en) * | 2021-03-19 | 2023-08-15 | 江西云威新材料有限公司 | Method for preparing battery-grade anhydrous lithium hydroxide from industrial-grade lithium carbonate |
| CN114538480A (en) * | 2022-03-25 | 2022-05-27 | 江西九岭锂业股份有限公司 | Process method of micro-powder battery-grade lithium hydroxide monohydrate |
| CN114590824A (en) * | 2022-04-18 | 2022-06-07 | 四川兴晟锂业有限责任公司 | Anhydrous lithium hydroxide continuous production process and device |
| CN115849412A (en) * | 2022-12-27 | 2023-03-28 | 江西东鹏新材料有限责任公司 | Preparation method of battery-grade fine-grain lithium hydroxide monohydrate |
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Application publication date: 20200519 |