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Preparation method of high-surface-area aluminum oxide micro powder

A technology of alumina micropowder and high specific surface, which is applied in the field of materials, can solve the problems of unresolved contradiction between micropowder and high specific surface, high-salt wastewater cannot be recycled, environmental risks and high production costs, and achieve the purpose of inhibiting particle agglomeration, inhibiting Capillary collapse and the effect of breaking through technical bottlenecks

Active Publication Date: 2017-11-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above method can obtain activated alumina with a large specific surface area by preparing nanoparticles, the process is complicated, the aluminum salt raw material is expensive, and the high-salt wastewater generated cannot be recycled, so the environmental risk and production cost are high.
Moreover, in order to improve the specific surface of the product, the principle of increasing the specific surface through particle nanosizing is still followed, and the contradiction between the micropowder and the high specific surface has not been resolved.

Method used

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Examples

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Embodiment 1

[0037] A kind of preparation method of high specific surface alumina micropowder of the present invention, see figure 1 , including the following steps:

[0038] (1) At 35°C, in 500 mL sodium aluminate solution (Na 2 o K (caustic) = 10 g / L, Al 2 o 3 =12.2g / L, caustic ratio α K =1.4), add 10 ppm stearic acid and polyethylene glycol mixture (the mass ratio of stearic acid and polyethylene glycol is 1:1), and introduce 10% (volume percentage) of CO 21 h, aluminum hydroxide slurry was obtained.

[0039] (2) At 50°C, continue to feed 10% CO into the aluminum hydroxide slurry 2 4 h, to get the snarbite slurry. Vacuum filtration of the sponsonite slurry, separating the filter residue and filtrate, taking the filter residue and washing it fully with hot water to obtain the sponsonite. The filtrate is the sodium carbonate solution, and the sodium carbonate solution is reacted with lime to generate sodium hydroxide solution and calcium carbonate, and the evaporated and concentr...

Embodiment 2

[0044] A kind of method of high specific surface alumina micropowder of the present invention, see figure 1 , including the following steps:

[0045] (1) At 65°C, in 500 mL sodium aluminate solution (Na 2 o K (caustic) = 130 g / L, Al 2 o 3 =120g / L, caustic ratio α K =1.8), add 200 ppm stearic acid, mannitol and polyethylene glycol mixture (the mass ratio of stearic acid, mannitol and polyethylene glycol is 3:1:6), and introduce 30% CO 2 5 h, aluminum hydroxide slurry was obtained. The aluminum hydroxide slurry is subjected to solid-liquid separation, the filter residue is washed with hot water to obtain aluminum hydroxide, and the filtrate is sodium aluminate solution.

[0046] (2) At 70°C, add the aluminum hydroxide in step (1) to 100 g / L sodium carbonate solution, and pass in 30% CO 2 6h, to obtain the sialonite slurry. Vacuum filtration of the sponsonite slurry, separating the filter residue and filtrate, taking the filter residue and washing it fully with hot wate...

Embodiment 3

[0051] A kind of method of high specific surface alumina micropowder of the present invention, see figure 1 , including the following steps:

[0052] (1) At 55°C, in 500 mL sodium aluminate solution (Na 2 o K (caustic) = 50 g / L, Al 2 o 3 =49.8g / L, caustic ratio α K =1.6), add 50 ppm stearic acid and polyethylene glycol mixture (the mass ratio of stearic acid and polyethylene glycol is 1:2), and introduce 15% CO 2 5 h, aluminum hydroxide slurry was obtained.

[0053] (2) At 50°C, continue to feed CO into the aluminum hydroxide slurry 2 6 h, to get the sarsonite slurry. Vacuum filtration of the sponsonite slurry, separating the filter residue and filtrate, taking the filter residue and washing it fully with hot water to obtain the sponsonite. The filtrate is sodium carbonate solution. The sodium carbonate solution is reacted with lime to generate sodium hydroxide solution and calcium carbonate. The evaporated and concentrated sodium hydroxide solution dissolves aluminu...

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Abstract

The invention discloses a preparation method of high-surface-area aluminum oxide micro powder. The method comprises the following steps of mixing a sodium aluminate solution and an additive; introducing CO2; separating out aluminum hydroxide; continuously introducing CO2 into the aluminum hydroxide; separating out dawsonite; adding an ammonium salt solution for reaction in the dawsonite to obtain ammonium aluminum carbonate hydroxide; roasting the ammonium aluminum carbonate hydroxide to obtain the aluminum oxide micro powder. The particle surface modification and the material phase conversion are performed through the additive; the problem of particle agglomeration is solved; the capillary collapse is inhibited through ammonia gas and CO2 generated through decomposition, so that the high-surface-area aluminum oxide micro powder is prepared. The preparation method also has the advantages of high product purity, low production cost, friendly process environment and the like.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing alumina micropowder with a high specific surface area. Background technique [0002] High specific surface alumina powder is widely used in chemical industry, environmental protection, materials and other fields, especially as raw materials for catalyst (or catalyst carrier), adsorbent, inorganic membrane preparation and so on. With the expansion of the application range of alumina-based catalysts and adsorbents, and the improvement of performance, cost and environmental protection requirements, new preparation technologies need to be developed. [0003] There are mainly two technical solutions for preparing alumina-based adsorbents or catalyst supports. (1) Low-cost preparation of alumina-based micropowder with low specific surface area. Mainly use industrial aluminum hydroxide, sodium aluminate solution or aluminum-containing salt to precipitate alumi...

Claims

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Application Information

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IPC IPC(8): C01F7/14C01F7/30B82Y40/00
Inventor 刘桂华吴国玉李小斌彭志宏周秋生齐天贵
Owner CENT SOUTH UNIV
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