CN115818685A - Preparation method of spherical easily-dispersible alumina for diaphragm - Google Patents
Preparation method of spherical easily-dispersible alumina for diaphragm Download PDFInfo
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- CN115818685A CN115818685A CN202111080857.5A CN202111080857A CN115818685A CN 115818685 A CN115818685 A CN 115818685A CN 202111080857 A CN202111080857 A CN 202111080857A CN 115818685 A CN115818685 A CN 115818685A
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- aluminum
- aluminum hydroxide
- mixed solution
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- alumina
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 33
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000013078 crystal Substances 0.000 claims abstract description 24
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims abstract description 14
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 239000002244 precipitate Substances 0.000 claims abstract description 13
- 238000001354 calcination Methods 0.000 claims abstract description 12
- 238000001556 precipitation Methods 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 9
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 9
- 239000011734 sodium Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000012716 precipitator Substances 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 239000008213 purified water Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 239000008118 PEG 6000 Substances 0.000 claims description 3
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 claims description 3
- 229920002584 Polyethylene Glycol 6000 Polymers 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 claims description 3
- 210000000582 semen Anatomy 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000411 inducer Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000011164 primary particle Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to the field of production of aluminum oxide for lithium battery diaphragms, in particular to a preparation method of spherical easily-dispersed aluminum oxide for diaphragms. A preparation method of spherical easily-dispersible alumina for a diaphragm comprises the following steps of (1) preparing seeds: adding a mixed solution of aluminum sulfate and aluminum nitrate into deionized water, adding formamide serving as a precipitator into the mixed solution, adding a dispersing agent into the mixed solution, stirring the mixed solution for 30min, heating to 90 ℃, preserving heat for 2h, and continuously cleaning precipitates to obtain aluminum hydroxide seed crystals. (2) preparing aluminum hydroxide: adding seed crystals into the sodium metaaluminate solution, carrying out liquid-solid separation on the slurry after seed precipitation reaction, washing with purified water, carrying out solid-liquid separation, drying and grading to obtain aluminum hydroxide micro powder; (3) preparing alumina: uniformly mixing the aluminum hydroxide micro powder and a mineralizer, placing the mixture into a die, calcining the mixture in a calcining furnace, cooling the mixture, crushing the cooled mixture, and packaging the crushed mixture into a finished product in a grading manner. The alumina produced by the preparation method is spherical in shape and has better dispersibility.
Description
Technical Field
The invention relates to the field of production of aluminum oxide for lithium battery diaphragms, in particular to a preparation method of spherical easily-dispersed aluminum oxide for diaphragms.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by lithium ions moving back and forth between a positive electrode and a negative electrode. During the charging and discharging processes, li + can be repeatedly inserted and extracted between the two electrodes; wherein Li + is extracted from the positive electrode during charging and then inserted into the negative electrode through the electrolyte, the negative electrode being in a lithium-rich state, and vice versa during discharging. In the structure of a lithium battery, a separator is one of the most critical inner layer components, and mainly functions to separate the positive and negative electrodes of the battery to prevent a short circuit phenomenon caused by contact between the two electrodes and to allow electrolyte ions to pass through. The performance of the battery determines the characteristics of the battery such as the section structure, the internal resistance and the like, and directly influences the cycle, the capacity, the safety performance and the like of the battery. The ultra-fine alumina is an important functional ceramic raw material and has good performance, and the coating of the alumina on the surface of the lithium battery diaphragm is a relatively universal diaphragm production mode at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a preparation method of spherical easily-dispersible alumina for a diaphragm.
In order to solve the problems of the prior art, the invention discloses a preparation method of spherical easily-dispersible alumina for a diaphragm,
(1) Preparing seeds: adding a mixed solution of aluminum sulfate and aluminum nitrate into deionized water, wherein the mass ratio of the aluminum sulfate to the aluminum nitrate is controlled to be 1;
adding formamide into the mixed solution as a precipitator, wherein the mass of the formamide accounts for 1/10 of that of the deionized water;
adding a dispersant into the mixed solution, wherein the mass of the dispersant accounts for 2% of the mass of the deionized water;
stirring the mixed solution for 30min until all the components in the solution are uniformly mixed;
heating the mixed solution to 90 ℃ and preserving heat for 2h to ensure that the reaction is completely carried out, standing for 24h, and continuously cleaning the precipitate after the precipitate is naturally precipitated to prepare the aluminum hydroxide seed crystal.
(2) Preparing aluminum hydroxide: adding the aluminum hydroxide seed crystal prepared in the step (1) into the sodium metaaluminate solution, wherein the reaction conditions are as follows: decomposition temperature: 68 ℃, seed rate: 5%, decomposition time: 8h, concentration of the sodium metaaluminate seminal fluid: al (Al) 2 O 3 The content is 130g/L, the causticity ratio is 1.5, the slurry after seed precipitation reaction is subjected to liquid-solid separation, four times of reverse stirring washing is carried out, when the slurry is washed for the last time, a penetrating agent is added into the slurry, the slurry is stirred for 30min, a dispersing agent is added to improve the split fluidity, purified water is used for washing, and the aluminum hydroxide micro powder is prepared after the solid-liquid separation and drying classification;
(3) Preparing alumina: after uniformly mixing the aluminum hydroxide micro powder and a mineralizer, placing the mixture into a mould to calcine in a calciner, wherein the interval temperature of the calciner is set as follows: a first interval: 800-900 ℃, second interval: 1100-1200 ℃; the third interval: 1100-1200 ℃, fourth interval: 800-900 ℃, calcination time: and 3h, after calcining, cooling, crushing, grinding, inspecting in grades, and packaging to obtain the finished product.
Preferably, the dispersing agents used in step (1) are PEG400 and PEG6000.
Preferably, the directional washing in step (2) is water used for the current washing, and then the slurry needing to be washed in the previous time is washed.
Preferably, the concentration of aluminum nitrate and aluminum sulfate in step (1) are both greater than 98%.
Preferably, the concentration of formamide in step (1) is greater than 99%.
In the invention, the seeds applied in the seed precipitation reaction are prepared by adopting a uniform precipitation method, because aluminum sulfate has stronger nucleation capability when being used as an aluminum source, primary particles can be compressed to grow spherical precipitates, and the growth is slow, so that the generated precipitates are nearly spherical, and the size distribution of the particles is narrow but slightly large. And aluminum nitrate is used as an aluminum source, the generated particles are fine, and the precipitate structure is a fluffy flocculent structure. Therefore, through continuous experiments, the aluminum hydroxide crystal with a spherical structure with fine particles and uniform distribution can be generated by mixing the aluminum hydroxide crystal and the aluminum hydroxide crystal according to the proportion. The crystal with the spherical structure is used as the crystal seed, so that the prepared finished product has a uniform structure, is not easy to agglomerate and is easy to disperse.
In the process of preparing the aluminum hydroxide, sodium attached to the surfaces of the crystals can be effectively removed through four times of reverse washing, and the intercrystalline soda can be permeated and washed clean by adding a penetrant into the slurry during the fourth washing, so that the purity of the product is effectively improved.
In the preparation process from aluminum hydroxide to aluminum oxide, the aluminum hydroxide is prepared by adopting a calcination mode. The aluminum hydroxide micro powder is mixed with the inducer, so that the calcining temperature can be effectively reduced, the energy is saved, and the consumption is reduced.
The invention has the beneficial effects that: the aluminum sulfate and the aluminum nitrate are creatively adopted as aluminum sources, the formamide is adopted as a precipitator, seed crystals for seed precipitation reaction are prepared by a direct precipitation method, the structure is round and smooth, the crystal grains are fine, and the particle size distribution is narrow.
Detailed Description
The following examples are intended only to more clearly illustrate the particular preparation process of the present invention.
A method for preparing spherical easily-dispersed alumina for a diaphragm,
(1) Preparing seeds: adding a mixed solution of aluminum sulfate and aluminum nitrate into deionized water, wherein the mass ratio of the aluminum sulfate to the aluminum nitrate is controlled to be 1;
adding formamide into the mixed solution as a precipitator, wherein the mass of the formamide accounts for 1/10 of that of the deionized water;
adding a dispersant into the mixed solution, wherein the mass of the dispersant accounts for 2% of the mass of the deionized water;
stirring the mixed solution for 30min until all the components in the solution are uniformly mixed;
heating the mixed solution to 90 ℃ and preserving heat for 2h to ensure that the reaction is completely carried out, standing for 24h, and continuously cleaning the precipitate after the precipitate is naturally precipitated to prepare the aluminum hydroxide seed crystal.
(2) Preparing aluminum hydroxide: adding the aluminum hydroxide seed crystal prepared in the step (1) into the sodium metaaluminate solution, wherein the reaction conditions are as follows: decomposition temperature: 68 ℃, seed rate: 5%, decomposition time: 8h, concentration of the sodium metaaluminate seminal fluid: al (Al) 2 O 3 The content is 130g/L, the causticity ratio is 1.5, the slurry after seed precipitation reaction is subjected to liquid-solid separation, four times of reverse stirring washing is carried out, when the slurry is washed for the last time, a penetrating agent is added into the slurry, the slurry is stirred for 30min, a dispersing agent is added to improve the split fluidity, purified water is used for washing, and the aluminum hydroxide micro powder is prepared after the solid-liquid separation and drying classification;
(3) Preparing alumina: after uniformly mixing the aluminum hydroxide micro powder and a mineralizer, placing the mixture into a mould to calcine in a calciner, wherein the interval temperature of the calciner is set as follows: a first interval: 800-900 ℃, second interval: 1100-1200 ℃; the third interval: 1100-1200 ℃, fourth interval: 800-900 ℃, calcination time: and 3h, after calcining, cooling, crushing, grinding, inspecting in grades, and packaging to obtain the finished product.
Preferably, the dispersing agent used in step (1) is PEG400 and PEG6000.
Preferably, the directional washing in step (2) is water used for the current washing, and then the slurry needing to be washed in the previous time is washed.
Preferably, the concentration of aluminum nitrate and aluminum sulfate in step (1) are both greater than 98%.
Preferably, the concentration of formamide in step (1) is greater than 99%.
In the invention, the seeds applied in the seed precipitation reaction are prepared by adopting a uniform precipitation method, because aluminum sulfate has stronger nucleation capability when being used as an aluminum source, primary particles can be compressed to grow spherical precipitates, and the growth is slow, so that the generated precipitates are nearly spherical, and the size distribution of the particles is narrow but slightly large. And aluminum nitrate is used as an aluminum source, the generated particles are fine, and the precipitate structure is a fluffy flocculent structure. Therefore, through continuous experiments, the aluminum hydroxide crystal with a spherical structure with fine particles and uniform distribution can be generated by mixing the aluminum hydroxide crystal and the aluminum hydroxide crystal according to the proportion. The crystal with the spherical structure is used as the crystal seed, so that the prepared finished product has a uniform structure, is not easy to agglomerate and is easy to disperse.
In the process of preparing the aluminum hydroxide, sodium attached to the surfaces of the crystals can be effectively removed through four times of reverse washing, and the intercrystalline soda can be permeated and washed clean by adding a penetrant into the slurry during the fourth washing, so that the purity of the product is effectively improved.
In the preparation process of aluminum hydroxide to aluminum oxide, the aluminum hydroxide is prepared by adopting a calcination mode. The aluminum hydroxide micro powder is mixed with the inducer, so that the calcining temperature can be effectively reduced, the energy is saved, and the consumption is reduced.
The invention has the beneficial effects that: the aluminum sulfate and the aluminum nitrate are creatively adopted as aluminum sources, the formamide is adopted as a precipitator, seed crystals for seed precipitation reaction are prepared by a direct precipitation method, the structure is round and smooth, the crystal grains are fine, and the particle size distribution is narrow.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A preparation method of spherical easily-dispersed alumina for a diaphragm is characterized by comprising the following steps:
(1) Preparing seeds: adding a mixed solution of aluminum sulfate and aluminum nitrate into deionized water, wherein the mass ratio of the aluminum sulfate to the aluminum nitrate is controlled to be 1;
adding formamide into the mixed solution as a precipitator, wherein the mass of the formamide accounts for 1/10 of that of the deionized water;
adding a dispersant into the mixed solution, wherein the mass of the dispersant accounts for 2% of the mass of the deionized water;
stirring the mixed solution for 30min until all the components in the solution are uniformly mixed;
heating the mixed solution to 90 ℃ and preserving heat for 2h to ensure that the reaction is completely carried out, standing for 24h, and continuously cleaning the precipitate after the precipitate is naturally precipitated to prepare aluminum hydroxide seed crystals;
(2) Preparing aluminum hydroxide: adding the aluminum hydroxide seed crystal prepared in the step (1) into the sodium metaaluminate solution, wherein the reaction conditions are as follows: decomposition temperature: 68 ℃, seed rate: 5%, decomposition time: 8h, concentration of the sodium metaaluminate semen: al (Al) 2 O 3 The content is 130g/L, the causticity ratio is 1.5, the slurry after seed precipitation reaction is subjected to liquid-solid separation, four times of reverse stirring washing is carried out, when the slurry is washed for the last time, a penetrating agent is added into the slurry, the slurry is stirred for 30min, a dispersing agent is added to improve the split fluidity, purified water is used for washing, and the aluminum hydroxide micro powder is prepared after the solid-liquid separation and drying classification;
(3) Preparing alumina: after uniformly mixing the aluminum hydroxide micro powder and a mineralizer, placing the mixture into a mould to calcine in a calciner, wherein the interval temperature of the calciner is set as follows: a first interval: 800-900 ℃, second interval: 1100-1200 ℃; the third interval: 1100-1200 ℃, fourth interval: 800-900 ℃, calcination time: and 3h, after calcining, cooling, crushing, grinding, inspecting in grades, and packaging to obtain the finished product.
2. The method for preparing spherical easily dispersible alumina for separator according to claim 1, wherein: the dispersing agents used in step (1) were PEG400 and PEG6000.
3. The method for preparing alumina for spherical easy-to-disperse membranes according to claim 2 is characterized in that: and (3) washing in the direction in the step (2) to obtain water after the current washing, and then washing the slurry needing to be washed in the previous time.
4. The method for preparing spherical easily dispersible alumina for separator according to claim 3, wherein: in the step (1), the concentrations of aluminum nitrate and aluminum sulfate are both more than 98 percent.
5. The method for preparing spherical easily dispersible alumina for separator according to claim 4, wherein: the concentration of formamide in step (1) is greater than 99%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111080857.5A CN115818685A (en) | 2021-09-15 | 2021-09-15 | Preparation method of spherical easily-dispersible alumina for diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080857.5A CN115818685A (en) | 2021-09-15 | 2021-09-15 | Preparation method of spherical easily-dispersible alumina for diaphragm |
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| CN115818685A true CN115818685A (en) | 2023-03-21 |
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| CN202111080857.5A Withdrawn CN115818685A (en) | 2021-09-15 | 2021-09-15 | Preparation method of spherical easily-dispersible alumina for diaphragm |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1927716A (en) * | 2006-08-29 | 2007-03-14 | 吉林大学 | Preparation method of alumina |
| CN102120596A (en) * | 2010-01-08 | 2011-07-13 | 北京世纪地和科技有限公司 | Method for preparing aluminum hydroxide by utilizing precipitation method |
| CN102363577A (en) * | 2011-08-04 | 2012-02-29 | 中国铝业股份有限公司 | Production method of heat conducting high-temperature alumina filling material, and product thereof |
| CN102992368A (en) * | 2012-11-19 | 2013-03-27 | 贵州省新材料研究开发基地 | Purification method for removing sodium in aluminum hydroxide micropowder |
| CN103332718A (en) * | 2013-07-10 | 2013-10-02 | 晋城市富基新材料股份有限公司 | Preparation method of ultrafine low-sodium alpha-alumina micropowder |
| CN105271336A (en) * | 2015-11-20 | 2016-01-27 | 济南泰星精细化工有限公司 | Preparation method of high-dispersion superfine aluminium hydroxide |
-
2021
- 2021-09-15 CN CN202111080857.5A patent/CN115818685A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1927716A (en) * | 2006-08-29 | 2007-03-14 | 吉林大学 | Preparation method of alumina |
| CN102120596A (en) * | 2010-01-08 | 2011-07-13 | 北京世纪地和科技有限公司 | Method for preparing aluminum hydroxide by utilizing precipitation method |
| CN102363577A (en) * | 2011-08-04 | 2012-02-29 | 中国铝业股份有限公司 | Production method of heat conducting high-temperature alumina filling material, and product thereof |
| CN102992368A (en) * | 2012-11-19 | 2013-03-27 | 贵州省新材料研究开发基地 | Purification method for removing sodium in aluminum hydroxide micropowder |
| CN103332718A (en) * | 2013-07-10 | 2013-10-02 | 晋城市富基新材料股份有限公司 | Preparation method of ultrafine low-sodium alpha-alumina micropowder |
| CN105271336A (en) * | 2015-11-20 | 2016-01-27 | 济南泰星精细化工有限公司 | Preparation method of high-dispersion superfine aluminium hydroxide |
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Application publication date: 20230321 |