CN101182022B - Preparation method of powder aluminum hydroxide - Google Patents
Preparation method of powder aluminum hydroxide Download PDFInfo
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- CN101182022B CN101182022B CN2007101161636A CN200710116163A CN101182022B CN 101182022 B CN101182022 B CN 101182022B CN 2007101161636 A CN2007101161636 A CN 2007101161636A CN 200710116163 A CN200710116163 A CN 200710116163A CN 101182022 B CN101182022 B CN 101182022B
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- aluminium hydroxide
- sodium aluminate
- aluminate solution
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- solution
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 title abstract 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 39
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000003518 caustics Substances 0.000 claims abstract description 3
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 75
- 238000000354 decomposition reaction Methods 0.000 claims description 23
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 23
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 16
- 238000005245 sintering Methods 0.000 description 14
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 14
- 238000009423 ventilation Methods 0.000 description 14
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Abstract
The invention relates to a preparation method of micro powder aluminum hydroxide, which is used for preparing the micro powder aluminum hydroxide. Sodium aluminate solution with the alumina content of 80-130g/l and liquor caustic ratio Alpha k equal to 1.4-1.6 is used as raw material and added with aluminum hydroxide seeds under the temperature of 40-65 DEG C. The method is characterized in that CO2 gas with mass concentration of 30-40 percent is fed into the solution for 2-6 hours after the solution is stirred for 0.5-2 hours, with the dissolution rate controlled at 85-95 percent, so as to obtain slurry which is then treated with conventional liquid-solid separation, washing and drying to finally obtain the micro powder aluminum hydroxide with d 50 of 0.6-4.5 Mum. The preparation method has simple technology, easy control, high dissolution rate, high yield and good crystallization of the products.
Description
Technical field
The present invention relates to a kind of preparation method of aluminium hydroxide micropowder, be used to produce aluminium hydroxide micropowder.
Background technology
Patent documentation about the preparation method of aluminium hydroxide micropowder is a lot, as: adopt kind of a point-score to prepare aluminium hydroxide micropowder, in sodium aluminate solution, add superfine aluminium hydroxide seed, stir to decompose and obtain aluminium hydroxide micropowder, equipment is simple, and quality product is easy to control, and rate of decomposition can reach 40～60%, lower, most of manufacturer adopts this method to produce.
As: adopt carbon decomposition aluminium hydroxide micropowder under the hypergravity situation, rate of decomposition can reach about 90%, but application apparatus equipment more complicated, equipment is difficult to maximize the industrial application difficulty.
As: adopt the acid-base neutralisation legal system to be equipped with aluminium hydroxide micropowder, obtain unformed aluminium hydroxide micropowder, product is unformed non-crystalline state.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of aluminium hydroxide micropowder, process is simple, control easily, rate of decomposition height, productive rate height, product advantages of good crystallization.
The preparation method of aluminium hydroxide micropowder of the present invention, with the sodium aluminate solution is raw material, alumina content is 80～130g/l in the sodium aluminate solution, solution caustic ratio α k=1.4～1.6, under 40～65 ℃ of temperature, add the aluminium hydroxide seed, it is characterized in that stirring 0.5～2 hour, feed mass concentration then and be 30～40% CO
2Gas was ventilated 2～6 hours, and rate of decomposition is controlled at 85～95%, and the slurries of gained are carried out liquid-solid separation, washing and the oven dry of routine, obtained aluminium hydroxide micropowder at last, its d
50Be 0.6～4.5 μ m.
Wherein: the common particle diameter of aluminium hydroxide seed is 0.6～0.8 μ m, can be sand-blast aluminium hydroxide seed for the aluminium hydroxide seed, add-on be in the sodium aluminate solution aluminium hydroxide quality 4～8%, or neutralisation aluminium hydroxide seed, add-on be in the sodium aluminate solution aluminium hydroxide quality 0.2～4.0%.
Whole production flow process of the present invention is divided into two operations, and plant branch process and carbon and divide process, with the sodium aluminate solution raw material, add superfine aluminium hydroxide seed, stir and decompose; After planting decomposition, feed CO
2The gas neutralization, rate of decomposition is controlled at below 95%, obtains aluminium hydroxide micropowder, d
50Be 0.6～4.5 μ m.Technological process is simple, and operating process is easy to control, rate of decomposition height, productive rate height, product advantages of good crystallization.
Description of drawings
Fig. 1, process flow diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 100g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 10m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.815 μ m, its analytical results sees Table 1.
Embodiment 2
Soda-lime sintering process gained refined sodium aluminate solution, its composition are that aluminum oxide contains 80g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 8.5m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 95%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.809 μ m, its analytical results sees Table 1.
Embodiment 3
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 130g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 11.5m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 80%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.803 μ m, its analytical results sees Table 1.
Embodiment 4
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 100g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 20m
3/ hour m
3Solution, carbon divided 2 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 1.408 μ m, its analytical results sees Table 1.
Embodiment 5
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 80g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 4m
3/ hour m
3Solution, carbon divided 8 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.807 μ m, its analytical results sees Table 1.
Embodiment 6
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 130g/l, and α k1.44 under 60 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 4%, stirred 0.5 hour, feed concentration then and be 38% CO
2Gas, ventilation speed are 13m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 2.328 μ m, its analytical results sees Table 1.
Embodiment 7
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 100g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 4 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 10m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.801 μ m, its analytical results sees Table 1.
Embodiment 8
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 80g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 4%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 8m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 1.26 μ m, its analytical results sees Table 1.
Embodiment 9
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 130g/l, and α k1.44 under 55 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 16%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 13m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.659 μ m, its analytical results sees Table 1.
Embodiment 10
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 100g/l, and α k1.44 under 65 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 4%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 10m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 4.283 μ m, its analytical results sees Table 1.
Embodiment 11
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 80g/l, and α k1.44 under 45 ℃, adds d
50Be the sand-blast aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 8%, stirred 1.0 hours, feed concentration then and be 35% CO
2Gas, ventilation speed are 8m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.626 μ m, its analytical results sees Table 1.
Embodiment 12
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 130g/l, and α k1.45 under 55 ℃, adds d
50Be the neutralisation aluminium hydroxide seed of 0.4 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 1%, stirred 1.0 hours, feed concentration then and be 37% CO
2Gas, ventilation speed are 13m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.834 μ m, its analytical results sees Table 1.
Embodiment 13
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 100g/l, and α k1.5 under 55 ℃, adds d
50Be the neutralisation aluminium hydroxide seed of 0.2 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 4%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 10m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 0.609 μ m, its analytical results sees Table 1.
Embodiment 14
Soda-lime sintering process gained refined sodium aluminate solution, its composition are alumina content 80g/l, and α k1.44 under 65 ℃, adds d
50Be the neutralisation aluminium hydroxide seed of 0.6 μ m, quality be in the sodium aluminate solution aluminium hydroxide quality 0.2%, stirred 1.0 hours, feed concentration then and be 38% CO
2Gas, ventilation speed are 8m
3/ hour m
3Solution, carbon divided 4 hours, and rate of decomposition is 90%, and the slurries of gained carry out liquid-solid separation, washing and oven dry, the aluminium hydroxide micropowder that obtains, d
50Be 4.327 μ m, its analytical results sees Table 1.
(table 1 vides infra)
Table 1 product analysis result (weight percent)
Claims (3)
1. the preparation method of an aluminium hydroxide micropowder, with the sodium aluminate solution is raw material, alumina content is 80～130g/l in the sodium aluminate solution, solution caustic ratio α k=1.4～1.6, under 40～65 ℃ of temperature, add the aluminium hydroxide seed, it is characterized in that stirring 0.5～2 hour, feed mass concentration then and be 30～40% CO
2Gas was ventilated 2～6 hours, and rate of decomposition is controlled at 85～95%, and the slurries of gained are carried out liquid-solid separation, washing and the oven dry of routine, obtained aluminium hydroxide micropowder at last, its d
50Be 0.6～4.5 μ m.
2. the preparation method of aluminium hydroxide micropowder according to claim 1 is characterized in that the aluminium hydroxide seed is a sand-blast aluminium hydroxide seed, add-on be in the sodium aluminate solution aluminium hydroxide quality 4～8%.
3. the preparation method of aluminium hydroxide micropowder according to claim 1 is characterized in that the aluminium hydroxide seed is a neutralisation aluminium hydroxide seed, add-on be in the sodium aluminate solution aluminium hydroxide quality 0.2～4.0%.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011137481A1 (en) * | 2010-05-03 | 2011-11-10 | Bhp Billiton Worsley Alumina Pty Ltd | Process for recovery of alumina using tricalcium aluminate |
| WO2011137480A1 (en) * | 2010-05-03 | 2011-11-10 | Bhp Billiton Worsley Alumina Pty Ltd | Sequestration of carbon dioxide using tricalcium aluminate |
| CN102303881A (en) * | 2011-08-18 | 2012-01-04 | 中国铝业股份有限公司 | Preparation method of aluminum hydroxide for titanium white |
| CN112028095A (en) * | 2020-08-12 | 2020-12-04 | 中铝山东有限公司 | Superfine aluminum hydroxide seed crystal and preparation method thereof, submicron aluminum hydroxide and preparation method and application thereof |
| CN112960682B (en) * | 2021-03-03 | 2022-10-11 | 杭州智华杰科技有限公司 | Method for increasing regeneration times of chromatographic alumina |
| CN114873619B (en) * | 2022-06-03 | 2024-02-13 | 中铝中州铝业有限公司 | Preparation method of amorphous aluminum hydroxide |
| CN115231596A (en) * | 2022-08-05 | 2022-10-25 | 洛阳中超新材料股份有限公司 | Industrial preparation method of bayer stone |
| CN116239134A (en) * | 2022-12-07 | 2023-06-09 | 雅安百图高新材料股份有限公司 | Treatment method of aluminum oxide calcined powder for heat conduction field |
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