Method for preparing ultrafine alumina powder with vertical faces

A technology of alumina ultra-fine powder and aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of the preparation process of alumina powder that reports are vertical, cannot be applied, and has no regulation. Product morphology and other problems, to achieve the effect of easy control of microstructure, consistent product morphology, and low production cost

Active Publication Date: 2017-03-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, so far, there are few reports on the preparation methods of alumina superfine powder with vertical surfaces, and there is no report on the preparation process of alumina powder with vertical surfaces in combination with aspects such as cost and environmental protection.
Although metallurgical-grade aluminum hydroxide, ultra-fine aluminum hydroxide or coarse-grained boehmite can be prepared through species classification (reaction), it does not regulate the specific morphology of the product, and more emphasis is placed on particle size, The control of purity or crystallization process (nucleation, agglomeration, growth, abrasion and fragmentation, etc.) cannot be applied to the preparation of alumina raw materials on 3D printing adsorbents and inorganic films

Method used

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  • Method for preparing ultrafine alumina powder with vertical faces
  • Method for preparing ultrafine alumina powder with vertical faces

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Experimental program
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Effect test

Embodiment 1

[0031]A method for preparing aluminum oxide superfine powder with vertical faces of the present invention, comprising the following steps:

[0032] (1) Select the sodium aluminate solution used as raw material for the seed fraction obtained after processing diaspore or boehmite by the Bayer process (Na in this sodium aluminate solution 2 o K (Caustic alkali)=162g / L, Al 2 o 3 =190.2g / L, Na 2 Oc=5g / L, Na 2 Os=0g / L, caustic ratio α K = 1.4);

[0033] (2) Take 1000mL of the above sodium aluminate solution, add 500g of flaky aluminum hydroxide (gibbsite type) with an average particle size of 1.7μm, and then react at 140°C for 5h under strong stirring conditions to precipitate a flaky An alumina hydrate dual-phase precursor whose boehmite (010) plane is perpendicular or approximately perpendicular to the flake-shaped gibbsite (001) or (112) plane;

[0034] (3) Calcining the dual-phase precursor obtained in step (2) at 650°C for 2 hours to obtain alumina powder with a special ...

Embodiment 2

[0036] A method for preparing aluminum oxide superfine powder with vertical faces of the present invention, comprising the following steps:

[0037] (1) Take 1000mL sodium aluminate solution (control Na in sodium aluminate solution 2 o K =50g / L, Al 2 o 3 =20.6g / L, Na 2 Oc=0g / L, Na 2 Os=5g / L, caustic ratio α K = 4.0);

[0038] (2) Add 100 g of flake aluminum hydroxide (gibbsite type) with an average particle size of 0.7 μm in the above-mentioned sodium aluminate solution as a seed crystal, and then add 100 ppm polyethylene glycol (molecular weight 6000) for seeding After 3 hours of seeding, the resulting slurry was filtered, washed with hot water, and dried to obtain alumina with flaky boehmite perpendicular or approximately perpendicular to the flaky gibbsite. Hydrate dual-phase precursor; the seed separation mother liquor obtained after filtration is returned to the production system of dissolving aluminum hydroxide or alumina;

[0039] (3) Calcinate the precursor obt...

Embodiment 3

[0041] A method for preparing aluminum oxide superfine powder with vertical faces of the present invention, comprising the following steps:

[0042] (1) Take 1000 mL of sodium aluminate solution, and control the Na in the sodium aluminate solution 2 o K =100g / L, Al 2 o 3 =117.5g / L, Na 2 Oc=15g / L, Na 2 Os=0g / L, caustic ratio α K = 1.4;

[0043] (2) Add 300 g of flaky aluminum hydroxide (gibbsite type) with an average particle size of 1.5 μm in the above-mentioned 1000 mL sodium aluminate solution as a seed crystal, and then add 10 ppm polyethylene glycol (molecular weight 20000) for seeding The temperature of the seed separation process is controlled to be 130°C. After the seed separation is decomposed for 3 hours, the obtained slurry is filtered, washed with hot water, and dried to obtain the flaky boehmite perpendicular or approximately perpendicular to the flaky gibbsite. Alumina hydrate dual-phase precursor; the seed separation mother liquor obtained after filtration...

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Abstract

The invention discloses a method for preparing ultrafine alumina powder with vertical faces. The method comprises the following steps: (1) adding aluminum hydroxide to a sodium aluminate solution for seed precipitation, and partially dissolving aluminum hydroxide to precipitate boehmite; (2) performing solid-liquid separation on the mixture obtained in step (1) to obtain an alumina hydrate double-phase precursor with flaky boehmite perpendicular to or approximately perpendicular to flaky aluminum hydroxide; (3) calcining or sintering the alumina hydrate double-phase precursor to obtain the ultrafine alumina powder with the vertical faces. The alumina powder prepared with the method has the advantages that the product morphology is consistent, the micro-structure is easy to control, the production cost is low and the like, and has good application prospect in alumina-based adsorbents, catalysts and catalyst carrier inorganic films and 3D printing alumina-based materials.

Description

technical field [0001] The invention relates to a method for preparing alumina fine powder, in particular to a method for preparing alumina superfine powder with special shape-vertical surfaces. Background technique [0002] Ultrafine alumina powder is widely used in chemical industry, environmental protection, materials and other fields, and can be used as raw materials for catalyst (or catalyst carrier), adsorbent, inorganic membrane preparation, structural material preparation and so on. With the development of alumina-based adsorbents and inorganic membrane preparation technology, especially with the rapid development of 3D printing technology, higher requirements have been put forward for the consistency, order and controllability of the morphology of ultrafine alumina powder. Requirements, so that it has obvious advantages in ensuring that the adsorbent and inorganic membrane control its microstructure, specific surface area and strength of the product, and production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
CPCC01F7/14C01P2004/61
Inventor 刘桂华李铮李小斌彭志宏周秋生齐天贵
Owner CENT SOUTH UNIV
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