CN112357938A - Method for preparing battery-grade lithium carbonate by using lithium phosphate - Google Patents
Method for preparing battery-grade lithium carbonate by using lithium phosphate Download PDFInfo
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- CN112357938A CN112357938A CN202011264463.0A CN202011264463A CN112357938A CN 112357938 A CN112357938 A CN 112357938A CN 202011264463 A CN202011264463 A CN 202011264463A CN 112357938 A CN112357938 A CN 112357938A
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- lithium
- lithium carbonate
- phosphate
- carbonate
- lithium phosphate
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- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 title claims abstract description 95
- 229910052808 lithium carbonate Inorganic materials 0.000 title claims abstract description 95
- 229910001386 lithium phosphate Inorganic materials 0.000 title claims abstract description 65
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 33
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000011259 mixed solution Substances 0.000 claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 26
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 18
- 239000010452 phosphate Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000006227 byproduct Substances 0.000 claims abstract description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 50
- 239000000463 material Substances 0.000 claims description 42
- 239000000243 solution Substances 0.000 claims description 37
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 35
- 229910052744 lithium Inorganic materials 0.000 claims description 35
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 25
- 235000017550 sodium carbonate Nutrition 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229940085991 phosphate ion Drugs 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000012267 brine Substances 0.000 description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052629 lepidolite Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052642 spodumene Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/08—Carbonates; Bicarbonates
-
- 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
Abstract
The invention discloses a method for preparing battery-grade lithium carbonate by using lithium phosphate, which comprises the following steps: the method comprises the following steps: putting the massive lithium phosphate solid raw material into a grinder for fully grinding, putting the obtained small-particle lithium phosphate solid into a grinder for grinding after grinding, then obtaining powdery lithium phosphate particles A, and performing a second step: and (2) pouring the lithium phosphate particles A obtained in the step one into a stirrer, then pouring a proper amount of dilute sulfuric acid into the stirrer, and then fully stirring the lithium phosphate particles A and the dilute sulfuric acid while heating to completely dissolve the lithium phosphate particles A into the dilute sulfuric acid, thus obtaining a mixed solution B. The lithium carbonate produced by the method has high purity and good quality, can meet the battery grade requirement, can produce the byproduct phosphate, and can improve the production benefit of manufacturers.
Description
Technical Field
The invention relates to the technical field of resource recovery, in particular to a method for preparing battery-grade lithium carbonate by using lithium phosphate.
Background
Lithium carbonate is an important chemical raw material, and with the rapid development of low-carbon economy and green new energy industry, especially with the breakthrough and popularization and application of large-capacity power battery technology, the novel lithium electric vehicle industry rises rapidly, and the rapid development of the lithium electric industry becomes a common consensus of people. With the emergence of the national new energy development planning, the lithium battery new energy becomes one of the energy industries which are key in national support development; lithium carbonate is used as an important basic raw material for the development of new energy of lithium batteries, and the demand of lithium carbonate is increasing.
According to the difference of raw materials, the industrial preparation method of lithium carbonate is mainly divided into two types: one is that from the brine containing lithium, through carrying on the comprehensive extraction and utilization to other valuable metallic minerals in the brine, make lithium in the brine enrich, and then extract lithium and get lithium carbonate through further processing, however, because the salt lake brine of China has the characteristic of low magnesium-lithium ratio mostly, the development difficulty is great, the industrial implementation of extracting lithium from brine is difficult;
the other method is to destroy the original gangue structure of the main lithium-containing ores, namely spodumene and lepidolite, by dry or wet treatment, so that lithium oxide in the gangue structure is dissolved out in the form of soluble lithium salt, and then lithium is precipitated by carbonization or soda ash to obtain a lithium carbonate product. The preparation method for extracting lithium carbonate by taking lepidolite ore as a raw material mainly comprises a calcination method and an acid leaching method, and the production yield of lithium carbonate is not ideal, so that the production benefit of enterprises is influenced.
However, in view of the existing production process for preparing lithium carbonate, there are many methods for preparing lithium carbonate by using lithium-containing ores such as lepidolite and the like as raw materials, and a technical scheme for preparing lithium carbonate by using other lithium salts as raw materials is not common, for example, a method for preparing battery-grade lithium carbonate by using lithium phosphate as a raw material is a technical scheme for preparing high-purity lithium carbonate with a high cost performance and an excellent control on environment and production process.
Disclosure of Invention
The invention aims to provide a method for preparing battery-grade lithium carbonate by using lithium phosphate so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing battery-grade lithium carbonate by using lithium phosphate comprises the following steps:
the method comprises the following steps: putting a large lithium phosphate solid raw material into a grinder for fully grinding, and putting the obtained small lithium phosphate solid particles into a grinder for grinding to obtain powdery lithium phosphate particles A;
step two: pouring the lithium phosphate particles A obtained in the step one into a stirrer, then pouring a proper amount of dilute sulfuric acid into the stirrer, then fully stirring the lithium phosphate particles A and the dilute sulfuric acid, and simultaneously heating to completely dissolve the lithium phosphate particles A into the dilute sulfuric acid, and then obtaining a mixed solution B;
step three: adding a phosphate ion remover into the mixed solution B for reaction, controlling the reaction time to be 1-2 h, and after the reaction is finished, putting the obtained material into a filtering device for solid-liquid separation to obtain phosphate solid and a lithium-containing solution C;
step four: collecting phosphate solid as a byproduct, heating the lithium-containing solution C to 100 ℃, adding a sodium carbonate solution into the lithium-containing solution C, and reacting to obtain a lithium carbonate mixed solution D;
step five: adding sodium carbonate into the lithium carbonate mixed solution D to perform impurity removal reaction so as to obtain a lithium carbonate wet material E, and then adding the lithium carbonate wet material E into water to perform cleaning so as to remove impurities dissolved in the water in the lithium carbonate wet material E;
step six: drying the lithium carbonate wet material E obtained in the fifth step to obtain a lithium carbonate dry material F;
step seven: and putting the lithium carbonate dry material F obtained in the sixth step into a grinder for grinding, and finally obtaining a battery-grade lithium carbonate product.
Preferably, the mass ratio of the lithium phosphate particles a to the dilute sulfuric acid in the second step is 1: 2-3.5.
Preferably, the heating temperature in the second step is controlled to be 70-80 ℃, and the stirring time is controlled to be 50-60 min.
Preferably, the mass ratio of the lithium-containing solution C to the sodium carbonate solution in the fourth step is 1: 2-2.6.
Preferably, the mass ratio of the lithium carbonate mixed solution D to the soda ash in the fifth step is 1: 1.5-2.5.
Preferably, the temperature of the water in the fifth step is controlled to be 90 ℃, and the washing times are 1-2 times.
Compared with the prior art, the invention has the following beneficial effects:
1. the lithium carbonate produced by the invention has high purity and good quality, and can meet the battery grade requirement.
2. The method can produce the phosphate as a byproduct, thereby improving the production benefit of manufacturers.
3. The method has the advantages of relatively simple process flow, safe and reliable reaction process and easy separation of reaction products.
Drawings
FIG. 1 is a schematic flow chart of the preparation method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for preparing battery-grade lithium carbonate by using lithium phosphate comprises the following steps:
the method comprises the following steps: putting a large lithium phosphate solid raw material into a grinder for fully grinding, and putting the obtained small lithium phosphate solid particles into a grinder for grinding to obtain powdery lithium phosphate particles A;
step two: pouring the lithium phosphate particles A obtained in the step one into a stirrer, and then pouring a proper amount of dilute sulfuric acid into the stirrer, wherein the mass ratio of the lithium phosphate particles A to the dilute sulfuric acid is 1:2-2.6, fully stirring the lithium phosphate particles A and dilute sulfuric acid, and simultaneously heating, wherein the heating temperature is controlled to be 70-80 ℃, and the stirring time is controlled to be 50-60min, so that the lithium phosphate particles A are completely dissolved in the dilute sulfuric acid, and then a mixed solution B is obtained;
step three: adding a phosphate ion remover into the mixed solution B for reaction, controlling the reaction time to be 1-2 h, and after the reaction is finished, putting the obtained material into a filtering device for solid-liquid separation to obtain phosphate solid and a lithium-containing solution C;
step four: collecting phosphate solids as a byproduct, heating the lithium-containing solution C to 100 ℃, adding a sodium carbonate solution into the lithium-containing solution C, wherein the mass ratio of the lithium-containing solution C to the sodium carbonate solution is 1:2-2.6, and reacting to obtain a lithium carbonate mixed solution D;
step five: and adding sodium carbonate into the lithium carbonate mixed solution D for impurity removal reaction, wherein the mass ratio of the lithium carbonate mixed solution D to the sodium carbonate is 1: 1.5-2.5, thus obtaining a lithium carbonate wet material E, then adding the lithium carbonate wet material E into water for cleaning, controlling the temperature of the water at 90 ℃, and cleaning for 1-2 times, thereby removing impurities dissolved in the water in the lithium carbonate wet material E;
step six: drying the lithium carbonate wet material E obtained in the fifth step to obtain a lithium carbonate dry material F;
step seven: and putting the lithium carbonate dry material F obtained in the sixth step into a grinder for grinding, and finally obtaining a battery-grade lithium carbonate product.
From the above, the finally obtained battery grade lithium carbonate product has high purity and good quality, and the phosphate byproduct has high purity and good quality.
Comparative example 1
A method for preparing battery-grade lithium carbonate by using lithium phosphate comprises the following steps:
the method comprises the following steps: putting a large lithium phosphate solid raw material into a grinder for fully grinding, and putting the obtained small lithium phosphate solid particles into a grinder for grinding to obtain powdery lithium phosphate particles A;
step two: pouring the lithium phosphate particles A obtained in the step one into a stirrer, and then pouring a proper amount of dilute sulfuric acid into the stirrer, wherein the mass ratio of the lithium phosphate particles A to the dilute sulfuric acid is 1:3, fully stirring the lithium phosphate particles A and dilute sulfuric acid, and simultaneously heating, wherein the heating temperature is controlled at 60 ℃, and the stirring time is controlled at 70min, so that the lithium phosphate particles A are completely dissolved in the dilute sulfuric acid, and then a mixed solution B is obtained;
step three: adding a phosphate ion remover into the mixed solution B for reaction, controlling the reaction time to be 1-2 h, and after the reaction is finished, putting the obtained material into a filtering device for solid-liquid separation to obtain phosphate solid and a lithium-containing solution C;
step four: collecting phosphate solids as a byproduct, heating the lithium-containing solution C to 100 ℃, adding a sodium carbonate solution into the lithium-containing solution C, wherein the mass ratio of the lithium-containing solution C to the sodium carbonate solution is 1:3, and reacting to obtain a lithium carbonate mixed solution D;
step five: and adding sodium carbonate into the lithium carbonate mixed solution D for impurity removal reaction, wherein the mass ratio of the lithium carbonate mixed solution D to the sodium carbonate is 1:3, obtaining a lithium carbonate wet material E, then adding the lithium carbonate wet material E into water for cleaning, controlling the temperature of the water to be 90 ℃, and cleaning for 1-2 times to remove impurities dissolved in the water in the lithium carbonate wet material E;
step six: drying the lithium carbonate wet material E obtained in the fifth step to obtain a lithium carbonate dry material F;
step seven: and putting the lithium carbonate dry material F obtained in the sixth step into a grinder for grinding, and finally obtaining a battery-grade lithium carbonate product.
From the above, the finally obtained battery grade lithium carbonate product has low purity and poor quality, and the phosphate byproduct has low purity and poor quality.
Comparative example 2
A method for preparing battery-grade lithium carbonate by using lithium phosphate comprises the following steps:
the method comprises the following steps: putting a large lithium phosphate solid raw material into a grinder for fully grinding, and putting the obtained small lithium phosphate solid particles into a grinder for grinding to obtain powdery lithium phosphate particles A;
step two: pouring the lithium phosphate particles A obtained in the step one into a stirrer, and then pouring a proper amount of dilute sulfuric acid into the stirrer, wherein the mass ratio of the lithium phosphate particles A to the dilute sulfuric acid is 1:5, fully stirring the lithium phosphate particles A and dilute sulfuric acid, and simultaneously heating, wherein the heating temperature is controlled at 30 ℃, and the stirring time is controlled at 40min, so that the lithium phosphate particles A are completely dissolved in the dilute sulfuric acid, and then a mixed solution B is obtained;
step three: adding a phosphate ion remover into the mixed solution B for reaction, controlling the reaction time to be 1-2 h, and after the reaction is finished, putting the obtained material into a filtering device for solid-liquid separation to obtain phosphate solid and a lithium-containing solution C;
step four: collecting phosphate solids as a byproduct, heating the lithium-containing solution C to 100 ℃, adding a sodium carbonate solution into the lithium-containing solution C, wherein the mass ratio of the lithium-containing solution C to the sodium carbonate solution is 1:5, and reacting to obtain a lithium carbonate mixed solution D;
step five: and adding sodium carbonate into the lithium carbonate mixed solution D for impurity removal reaction, wherein the mass ratio of the lithium carbonate mixed solution D to the sodium carbonate is 1:5, obtaining a lithium carbonate wet material E, then adding the lithium carbonate wet material E into water for cleaning, controlling the temperature of the water to be 90 ℃, and cleaning for 1-2 times to remove impurities dissolved in the water in the lithium carbonate wet material E;
step six: drying the lithium carbonate wet material E obtained in the fifth step to obtain a lithium carbonate dry material F;
step seven: and putting the lithium carbonate dry material F obtained in the sixth step into a grinder for grinding, and finally obtaining a battery-grade lithium carbonate product.
From the above, the finally obtained battery grade lithium carbonate product has low purity and poor quality, and the phosphate byproduct has low purity and poor quality.
Comparative example 3
A method for preparing battery-grade lithium carbonate by using lithium phosphate comprises the following steps:
the method comprises the following steps: putting a large lithium phosphate solid raw material into a grinder for fully grinding, and putting the obtained small lithium phosphate solid particles into a grinder for grinding to obtain powdery lithium phosphate particles A;
step two: pouring the lithium phosphate particles A obtained in the step one into a stirrer, and then pouring a proper amount of dilute sulfuric acid into the stirrer, wherein the mass ratio of the lithium phosphate particles A to the dilute sulfuric acid is 1:1, fully stirring the lithium phosphate particles A and dilute sulfuric acid, and simultaneously heating, wherein the heating temperature is controlled at 50 ℃, and the stirring time is controlled at 70min, so that the lithium phosphate particles A are completely dissolved in the dilute sulfuric acid, and then a mixed solution B is obtained;
step three: adding a phosphate ion remover into the mixed solution B for reaction, controlling the reaction time to be 1-2 h, and after the reaction is finished, putting the obtained material into a filtering device for solid-liquid separation to obtain phosphate solid and a lithium-containing solution C;
step four: collecting phosphate solids as a byproduct, heating the lithium-containing solution C to 100 ℃, adding a sodium carbonate solution into the lithium-containing solution C, wherein the mass ratio of the lithium-containing solution C to the sodium carbonate solution is 1:1, and reacting to obtain a lithium carbonate mixed solution D;
step five: and adding sodium carbonate into the lithium carbonate mixed solution D for impurity removal reaction, wherein the mass ratio of the lithium carbonate mixed solution D to the sodium carbonate is 1:1, obtaining a lithium carbonate wet material E, then adding the lithium carbonate wet material E into water for cleaning, controlling the temperature of the water to be 90 ℃, and cleaning for 1-2 times to remove impurities dissolved in the water in the lithium carbonate wet material E;
step six: drying the lithium carbonate wet material E obtained in the fifth step to obtain a lithium carbonate dry material F;
step seven: and putting the lithium carbonate dry material F obtained in the sixth step into a grinder for grinding, and finally obtaining a battery-grade lithium carbonate product.
From the above, the finally obtained battery grade lithium carbonate product has low purity and poor quality, and the phosphate byproduct has low purity and poor quality.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for preparing battery-grade lithium carbonate by using lithium phosphate is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: putting a large lithium phosphate solid raw material into a grinder for fully grinding, and putting the obtained small lithium phosphate solid particles into a grinder for grinding to obtain powdery lithium phosphate particles A;
step two: pouring the lithium phosphate particles A obtained in the step one into a stirrer, then pouring a proper amount of dilute sulfuric acid into the stirrer, then fully stirring the lithium phosphate particles A and the dilute sulfuric acid, and simultaneously heating to completely dissolve the lithium phosphate particles A into the dilute sulfuric acid, and then obtaining a mixed solution B;
step three: adding a phosphate ion remover into the mixed solution B for reaction, controlling the reaction time to be 1-2 h, and after the reaction is finished, putting the obtained material into a filtering device for solid-liquid separation to obtain phosphate solid and a lithium-containing solution C;
step four: collecting phosphate solid as a byproduct, heating the lithium-containing solution C to 100 ℃, adding a sodium carbonate solution into the lithium-containing solution C, and reacting to obtain a lithium carbonate mixed solution D;
step five: adding sodium carbonate into the lithium carbonate mixed solution D to perform impurity removal reaction so as to obtain a lithium carbonate wet material E, and then adding the lithium carbonate wet material E into water to perform cleaning so as to remove impurities dissolved in the water in the lithium carbonate wet material E;
step six: drying the lithium carbonate wet material E obtained in the fifth step to obtain a lithium carbonate dry material F;
step seven: and putting the lithium carbonate dry material F obtained in the sixth step into a grinder for grinding, and finally obtaining a battery-grade lithium carbonate product.
2. The method of claim 1 for preparing battery grade lithium carbonate from lithium phosphate, wherein: in the second step, the mass ratio of the lithium phosphate particles A to the dilute sulfuric acid is 1: 2-3.5.
3. The method of claim 1 for preparing battery grade lithium carbonate from lithium phosphate, wherein: and the heating temperature in the second step is controlled to be 70-80 ℃, and the stirring time is controlled to be 50-60 min.
4. The method of claim 1 for preparing battery grade lithium carbonate from lithium phosphate, wherein: in the fourth step, the mass ratio of the lithium-containing solution C to the sodium carbonate solution is 1: 2-2.6.
5. The method of claim 1 for preparing battery grade lithium carbonate from lithium phosphate, wherein: and in the fifth step, the mass ratio of the lithium carbonate mixed solution D to the soda ash is 1: 1.5-2.5.
6. The method of claim 1 for preparing battery grade lithium carbonate from lithium phosphate, wherein: and controlling the temperature of the water in the step five to be 90 ℃, wherein the cleaning times are 1-2.
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|---|---|---|---|---|
| CN107720716A (en) * | 2017-11-21 | 2018-02-23 | 成都开飞高能化学工业有限公司 | The technique for preparing battery-level lithium carbonate and ferric phosphate from crude product lithium phosphate recovery lithium phosphorus |
| CN109264748A (en) * | 2018-09-29 | 2019-01-25 | 广东邦普循环科技有限公司 | A method of lithium carbonate is prepared with crude lithium phosphate |
| CN110127731A (en) * | 2019-05-15 | 2019-08-16 | 上海中锂实业有限公司 | A method of battery-level lithium carbonate is directly prepared by lithium phosphate |
| CN110759364A (en) * | 2019-11-13 | 2020-02-07 | 江西金辉锂业有限公司 | Method for preparing high-purity lithium carbonate by using crude lithium phosphate |
| CA3109244A1 (en) * | 2018-08-09 | 2020-02-13 | DAI, Ailin | Method for greatly reducing sulphate content in various levels of lithium carbonate in spodumene sulfuric acid method |
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2020
- 2020-11-12 CN CN202011264463.0A patent/CN112357938A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107720716A (en) * | 2017-11-21 | 2018-02-23 | 成都开飞高能化学工业有限公司 | The technique for preparing battery-level lithium carbonate and ferric phosphate from crude product lithium phosphate recovery lithium phosphorus |
| CA3109244A1 (en) * | 2018-08-09 | 2020-02-13 | DAI, Ailin | Method for greatly reducing sulphate content in various levels of lithium carbonate in spodumene sulfuric acid method |
| CN109264748A (en) * | 2018-09-29 | 2019-01-25 | 广东邦普循环科技有限公司 | A method of lithium carbonate is prepared with crude lithium phosphate |
| CN110127731A (en) * | 2019-05-15 | 2019-08-16 | 上海中锂实业有限公司 | A method of battery-level lithium carbonate is directly prepared by lithium phosphate |
| CN110759364A (en) * | 2019-11-13 | 2020-02-07 | 江西金辉锂业有限公司 | Method for preparing high-purity lithium carbonate by using crude lithium phosphate |
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Application publication date: 20210212 |
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