CN113443615A - Preparation method of battery-grade lithium dihydrogen phosphate - Google Patents
Preparation method of battery-grade lithium dihydrogen phosphate Download PDFInfo
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- CN113443615A CN113443615A CN202010212735.6A CN202010212735A CN113443615A CN 113443615 A CN113443615 A CN 113443615A CN 202010212735 A CN202010212735 A CN 202010212735A CN 113443615 A CN113443615 A CN 113443615A
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- dihydrogen phosphate
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- lithium dihydrogen
- lithium
- phosphoric acid
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- SNKMVYBWZDHJHE-UHFFFAOYSA-M lithium;dihydrogen phosphate Chemical compound [Li+].OP(O)([O-])=O SNKMVYBWZDHJHE-UHFFFAOYSA-M 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 27
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000001704 evaporation Methods 0.000 claims abstract description 17
- 230000008020 evaporation Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 12
- 238000009835 boiling Methods 0.000 claims abstract description 11
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 3
- 238000010790 dilution Methods 0.000 claims abstract description 3
- 239000012895 dilution Substances 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 66
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 239000000047 product Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 8
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 7
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 7
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000012043 crude product Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002386 leaching Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000010413 mother solution Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 239000012047 saturated solution Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 238000007599 discharging Methods 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 239000012452 mother liquor Substances 0.000 abstract description 4
- 239000010405 anode material Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 230000002194 synthesizing effect Effects 0.000 abstract description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000010532 solid phase synthesis reaction Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
- C01B25/301—Preparation from liquid orthophosphoric acid or from an acid solution or suspension of orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
- C01B25/301—Preparation from liquid orthophosphoric acid or from an acid solution or suspension of orthophosphates
- C01B25/303—Preparation from liquid orthophosphoric acid or from an acid solution or suspension of orthophosphates with elimination of impurities
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A preparation method of battery-grade lithium dihydrogen phosphate comprises the steps of phosphoric acid dilution, double decomposition reaction, boiling to remove CO2, pH value adjustment, activated carbon impurity removal, evaporation concentration, cooling crystallization, separation, washing and drying. The invention overcomes the defects of the prior art, removes soluble impurities and insoluble impurities by a physical purification method, so the soluble impurities in the mother liquor are very low, the cycle times are greatly improved, the repeated crystallization during the mother liquor treatment is avoided, the energy consumption and the cost are reduced, the process flow is shortened, the recovery rate is improved, and the product quality is more stable; can be used for synthesizing lithium iron phosphate of the anode material of the lithium ion battery and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of preparation of battery-grade lithium dihydrogen phosphate, in particular to a preparation method of battery-grade lithium dihydrogen phosphate.
Background
At present, the substitute of non-renewable energy sources is vigorously developed in the fields of automobiles and the like, wherein lithium ion power batteries are one of the priority development projects. The lithium iron phosphate has the advantages of stable structure, good safety and the like, and is a preferred anode material of the lithium ion power battery. The main production methods of the existing lithium iron phosphate comprise a high-temperature solid-phase method and a liquid-phase method, the high-temperature solid-phase method is a method mainly used for industrial production at present, and lithium dihydrogen phosphate is used as a raw material for producing the lithium iron phosphate.
At present, the main methods for producing lithium dihydrogen phosphate include a neutralization method and an extraction method. The extractant used in the extraction method is one or a mixture of more of methanol, ethanol, propanol, isopropanol and glycerol, and has complex process, poor safety and high cost. The neutralization method has the advantages that an additive needs to be added in the intermediate process for removing impurities, the process flow is long, the preparation process of the additive is complex, the energy consumption is high, and the cost is high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of battery-grade lithium dihydrogen phosphate, which overcomes the defects of the prior art, and the obtained product has fine and uniform particles and white and bright color and is suitable for preparing a lithium dihydrogen phosphate product of a lithium ion cathode material through concentration, evaporation, cooling, crystallization, centrifugal separation, saturated washing, drying, airflow crushing and packaging.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of battery-grade lithium dihydrogen phosphate comprises the following steps:
(1) dilution of phosphoric acid: uniformly stirring phosphoric acid and pure water in a weight ratio of 1: 3;
(2) double decomposition reaction: and (2) adding the phosphoric acid solution prepared in the step (1) into a reaction kettle, and then adding phosphoric acid and lithium carbonate according to a molar ratio of 1: 1-1: 1.1, adding a proper amount of high-purity lithium carbonate into the phosphoric acid solution;
(3) boiling to remove CO 2: boiling the solution obtained by the reaction in the step (2) for 30min at normal pressure, and removing CO2 in the solution;
(4) adjusting the pH value: after complete reaction, adjusting the pH value of the neutralized solution to 1-3 by using lithium hydroxide or phosphoric acid in the mixed solution obtained in the step (3) to obtain a lithium dihydrogen phosphate solution;
(5) removing impurities by using activated carbon: adding activated carbon into the solution obtained in the step (4) to adsorb organic matters in the solution, thereby achieving the purpose of removing impurities; the dosage of the active carbon is 1-3 per mill of the solution volume (volume), the time is 0.5-3 hours, and the next step is carried out after the filter pressing is clear;
(6) and (3) evaporation and concentration: heating by using steam, and carrying out evaporation concentration on the solution obtained in the step (5), wherein the concentration temperature is controlled to be 115-135 ℃, so as to obtain a lithium dihydrogen phosphate concentrated solution;
(7) cooling and crystallizing: cooling the lithium dihydrogen phosphate concentrated solution subjected to evaporation concentration in the step (6) in a reaction kettle, and cooling to 20-40 ℃ for liquid-solid separation to obtain a lithium dihydrogen phosphate wet product and a lithium dihydrogen phosphate mother solution;
(8) separation and washing: dehydrating the lithium dihydrogen phosphate slurry obtained in the step (7) to obtain a lithium dihydrogen phosphate crude product, adding a lithium dihydrogen phosphate saturated solution for washing, dehydrating again, and repeatedly leaching for 2-6 times;
(9) and (3) drying: and (3) drying the wet lithium dihydrogen phosphate product obtained in the step (8) in a vacuum state, wherein the drying vacuum degree is-0.03 to-0.09 Mpa, the drying temperature is 105 to 130 ℃, and the drying time is 2 to 4 hours.
Preferably, in the step (8), when the lithium dihydrogen phosphate slurry is added into the centrifuge, the centrifuge is operated at a low speed, the discharge speed is controlled to uniformly add the lithium dihydrogen phosphate, and after the slurry is fully added, the centrifuge is operated at a high speed to dehydrate until the flowing water at the water outlet is not in a streamline shape.
The invention provides a preparation method of battery-grade lithium dihydrogen phosphate. The method has the following beneficial effects: soluble impurities and insoluble impurities are removed by a physical purification method, so that the soluble impurities in the mother liquor are very low, the cycle times are greatly improved, repeated crystallization during mother liquor treatment is avoided, the energy consumption and the cost are reduced, meanwhile, the process flow is shortened, the recovery rate is improved, and the product quality is more stable; can be used for synthesizing lithium iron phosphate of the anode material of the lithium ion battery and has wide market prospect.
Drawings
In order to more clearly illustrate the present invention or the prior art solutions, the drawings that are needed in the description of the prior art will be briefly described below.
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings.
Example one
A preparation method of battery-grade lithium dihydrogen phosphate comprises the following steps:
(1) taking 835g of 85% phosphoric acid (analytically pure), and adding 2839g of deionized water to prepare a 30% phosphoric acid solution;
(2) the phosphoric acid solution prepared in the step (1) is injected into a reaction kettle, and 265g of high-purity lithium carbonate is slowly added into the reaction kettle and stirred;
(3) boiling to remove CO 2: boiling the solution obtained by the reaction in the step (2) for 30min at normal pressure, and removing CO2 in the solution;
(4) adjusting the pH value: after complete reaction, adding phosphoric acid with the mass concentration of 85% into the mixed solution obtained in the step (3) to adjust the pH value of the neutralized solution to 2.5, so as to obtain a lithium dihydrogen phosphate solution;
(5) removing impurities by using activated carbon: adding activated carbon into the solution obtained in the step (4) to adsorb organic matters in the solution, thereby achieving the purpose of removing impurities; the dosage of the active carbon is 1 per mill of the solution volume, the time is 1 hour, and the next step is carried out after the filter pressing is clear;
(6) and (3) evaporation and concentration: heating by using steam, and carrying out evaporation concentration on the solution obtained in the step (5), wherein the concentration temperature is controlled at 115 ℃ to obtain a lithium dihydrogen phosphate concentrated solution;
(7) cooling and crystallizing: cooling the lithium dihydrogen phosphate concentrated solution subjected to evaporation concentration in the step (6) in a reaction kettle, and cooling to 40 ℃ for liquid-solid separation to obtain a lithium dihydrogen phosphate wet product and a lithium dihydrogen phosphate mother solution;
(8) separation and washing: dehydrating the lithium dihydrogen phosphate slurry obtained in the step (7) to obtain a lithium dihydrogen phosphate crude product, adding a lithium dihydrogen phosphate saturated solution for washing, dehydrating again, and repeatedly leaching for 3 times;
(9) and (3) drying: and (4) drying the lithium dihydrogen phosphate wet product obtained in the step (8) in a vacuum state, wherein the drying vacuum degree is-0.03 Mpa, the drying temperature is 110 ℃, and the drying time is 3 hours.
Example two
A preparation method of battery-grade lithium dihydrogen phosphate comprises the following steps:
(1) 835g of 85% phosphoric acid (analytically pure) is taken, 585g of deionized water is added to prepare a phosphoric acid solution with the concentration of 50%;
(2) the phosphoric acid solution prepared in the step (1) is injected into a reaction kettle, and 265g of high-purity lithium carbonate is slowly added into the reaction kettle and stirred;
(3) boiling to remove CO 2: boiling the solution obtained by the reaction in the step (2) for 30min at normal pressure, and removing CO2 in the solution;
(4) adjusting the pH value: after complete reaction, adding phosphoric acid with the mass concentration of 85% into the mixed solution obtained in the step (3) to adjust the pH value of the neutralized solution to 1.5, so as to obtain a lithium dihydrogen phosphate solution;
(5) removing impurities by using activated carbon: adding activated carbon into the solution obtained in the step (4) to adsorb organic matters in the solution, thereby achieving the purpose of removing impurities; the dosage of the active carbon is 3 per mill of the solution volume, the time is 2 hours, and the next step is carried out after the filter pressing is clear;
(6) and (3) evaporation and concentration: heating by using steam, and carrying out evaporation concentration on the solution obtained in the step (5), wherein the concentration temperature is controlled at 126 ℃, so as to obtain a lithium dihydrogen phosphate concentrated solution;
(7) cooling and crystallizing: cooling the lithium dihydrogen phosphate concentrated solution subjected to evaporation concentration in the step (6) in a reaction kettle, and cooling to 40 ℃ for liquid-solid separation to obtain a lithium dihydrogen phosphate wet product and a lithium dihydrogen phosphate mother solution;
(8) separation and washing: dehydrating the lithium dihydrogen phosphate slurry obtained in the step (7) to obtain a lithium dihydrogen phosphate crude product, adding a lithium dihydrogen phosphate saturated solution for washing, dehydrating again, and repeatedly leaching for 3 times;
(9) and (3) drying: and (4) drying the lithium dihydrogen phosphate wet product obtained in the step (8) in a vacuum state, wherein the drying vacuum degree is-0.06 Mpa, the drying temperature is 120 ℃, and the drying time is 1 hour.
EXAMPLE III
A preparation method of battery-grade lithium dihydrogen phosphate comprises the following steps:
(1) 835g of 85% phosphoric acid (analytically pure) is taken, 585g of deionized water is added to prepare a phosphoric acid solution with the concentration of 50%;
(2) the phosphoric acid solution prepared in the step (1) is injected into a reaction kettle, and 265g of high-purity lithium carbonate is slowly added into the reaction kettle and stirred;
(3) boiling to remove CO 2: boiling the solution obtained by the reaction in the step (2) for 30min at normal pressure, and removing CO2 in the solution;
(4) adjusting the pH value: after complete reaction, adding phosphoric acid with the mass concentration of 85% into the mixed solution obtained in the step (3) to adjust the pH value of the neutralized solution to 3, so as to obtain a lithium dihydrogen phosphate solution;
(5) removing impurities by using activated carbon: adding activated carbon into the solution obtained in the step (4) to adsorb organic matters in the solution, thereby achieving the purpose of removing impurities; the dosage of the active carbon is 3 per mill of the solution volume, the time is 2 hours, and the next step is carried out after the filter pressing is clear;
(6) and (3) evaporation and concentration: heating by using steam, and carrying out evaporation concentration on the solution obtained in the step (5), wherein the concentration temperature is controlled at 126 ℃, so as to obtain a lithium dihydrogen phosphate concentrated solution;
(7) cooling and crystallizing: cooling the lithium dihydrogen phosphate concentrated solution subjected to evaporation concentration in the step (6) in a reaction kettle, and cooling to 40 ℃ for liquid-solid separation to obtain a lithium dihydrogen phosphate wet product and a lithium dihydrogen phosphate mother solution;
(8) separation and washing: dehydrating the lithium dihydrogen phosphate slurry obtained in the step (7) to obtain a lithium dihydrogen phosphate crude product, adding a lithium dihydrogen phosphate saturated solution for washing, dehydrating again, and repeatedly leaching for 3 times;
(9) and (3) drying: and (4) drying the lithium dihydrogen phosphate wet product obtained in the step (8) in a vacuum state, wherein the drying vacuum degree is-0.06 Mpa, the drying temperature is 120 ℃, and the drying time is 1 hour.
The products of examples 1-3 were subjected to statistical quality analysis, with the results shown in the following table:
TABLE 1
The embodiment and the product component analysis result show that the method for preparing the battery-grade lithium dihydrogen phosphate is simple, easy to operate and low in production cost, and the obtained battery-grade lithium dihydrogen phosphate has stable quality, fine particles, uniform granularity and bright and white color and can be used for preparing the lithium battery cathode material.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. A preparation method of battery-grade lithium dihydrogen phosphate is characterized by comprising the following steps:
dilution of phosphoric acid: uniformly stirring phosphoric acid and pure water in a weight ratio of 1: 3;
double decomposition reaction: and (2) adding the phosphoric acid solution prepared in the step (1) into a reaction kettle, and then adding phosphoric acid and lithium carbonate according to a molar ratio of 1: 1-1: 1.1, adding a proper amount of high-purity lithium carbonate into the phosphoric acid solution;
boiling to remove CO 2: boiling the solution obtained by the reaction in the step (2) for 30min at normal pressure, and removing CO2 in the solution;
adjusting the pH value: after complete reaction, adjusting the pH value of the neutralized solution to 1-3 by using lithium hydroxide or phosphoric acid in the mixed solution obtained in the step (3) to obtain a lithium dihydrogen phosphate solution;
removing impurities by using activated carbon: adding activated carbon into the solution obtained in the step (4) to adsorb organic matters in the solution, thereby achieving the purpose of removing impurities; the dosage of the active carbon is 1-3 per mill of the solution volume (volume), the time is 0.5-3 hours, and the next step is carried out after the filter pressing is clear;
and (3) evaporation and concentration: heating by using steam, and carrying out evaporation concentration on the solution obtained in the step (5), wherein the concentration temperature is controlled to be 115-135 ℃, so as to obtain a lithium dihydrogen phosphate concentrated solution;
cooling and crystallizing: cooling the lithium dihydrogen phosphate concentrated solution subjected to evaporation concentration in the step (6) in a reaction kettle, and cooling to 20-40 ℃ for liquid-solid separation to obtain a lithium dihydrogen phosphate wet product and a lithium dihydrogen phosphate mother solution;
separation and washing: dehydrating the lithium dihydrogen phosphate slurry obtained in the step (7) to obtain a lithium dihydrogen phosphate crude product, adding a lithium dihydrogen phosphate saturated solution for washing, dehydrating again, and repeatedly leaching for 2-6 times;
and (3) drying: and (3) drying the wet lithium dihydrogen phosphate product obtained in the step (8) in a vacuum state, wherein the drying vacuum degree is-0.03 to-0.09 Mpa, the drying temperature is 105 to 130 ℃, and the drying time is 2 to 4 hours.
2. The method for preparing battery-grade lithium dihydrogen phosphate according to claim 1, wherein the method comprises the following steps: and (8) when the lithium dihydrogen phosphate slurry is added into the centrifuge, the centrifuge is operated at a low speed, the discharging speed is controlled to uniformly add the lithium dihydrogen phosphate, the centrifuge is operated at a high speed after the material is fully added, and the material is dehydrated until the flowing water at the water outlet is not in a streamline shape.
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