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Preparation method of high-purity aluminum oxide

A kind of alumina, high-purity technology, applied in the field of preparation of high-purity alumina, can solve the problems of low content, high price, environmental pollution, etc., and achieve the effect of high purity and less impurities

Inactive Publication Date: 2013-09-11
RUGAO CITY LEHENG CHEM COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for alumina used in phosphor powder, coatings, gemstones, high-pressure sodium lamp tubes, glass additives, electronic ceramics, catalyst carriers, etc., the impurity requirements are more stringent, and ordinary metallurgical-grade alumina cannot meet the use requirements, while traditional Industrialized alumina produced by Bayer method, soda lime sintering method or a combination of the two methods can only obtain Al due to raw material and process reasons. 2 o 3 Low content, impurity SiO 2 、Na 2 Ordinary alumina with high O content
[0003] At present, the main methods for preparing high-purity alumina powder are: improved Bayer method, ammonium alum decomposition method and its improved ammonium aluminum carbonate thermal decomposition method, organic aluminum decomposition method, aluminum powder water discharge method, and some of these methods are cheap But the performance is poor, some have good performance but the price is high, the process is complicated, and some also cause pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Add industrial 500gAl to the reaction tank 2 (SO 4 ) 3 18H 2 O was dissolved in 750ml of water and heated to boiling, adding 110g (NH 4 ) 2 SO 4 Stir to dissolve the solid, select a high-molecular PE microporous tube for ultra-fine microporous filtration, cool to room temperature under constant stirring, a large number of white crystals precipitate, filter the crystals with suction, rinse with a small amount of water once, and drain to obtain a crystallization;

[0019] 2) In the crystallization tank, add 500g of primary crystallized ammonium aluminum sulfate into 500ml of water, heat to dissolve, then cool to room temperature under stirring, filter and crystallize with suction to obtain a white crystal wet product, dry the wet product in an oven at 90°C Obtain aluminum ammonium sulfate crystals;

[0020] 3) Add 10% ammonia water to the obtained aluminum ammonium sulfate crystals to obtain aluminum hydroxide gel, add deionized water to wash, and use ion exchang...

Embodiment 2

[0023] 1) Add industrial 500gAl to the reaction tank 2 (SO 4 ) 3 18H 2 O was dissolved in 750ml of water and heated to boiling, adding 110g (NH 4 ) 2 SO 4 Stir to dissolve the solid, select a high-molecular PE microporous tube for ultra-fine microporous filtration, cool to room temperature under constant stirring, a large number of white crystals precipitate, filter the crystals with suction, rinse with a small amount of water once, and drain to obtain a crystallization;

[0024] 2) In the crystallization tank, add 500g of primary crystallized ammonium aluminum sulfate to 500ml of water,

[0025] Heat to dissolve, then cool to room temperature under stirring, suction filter and crystallize to obtain a white crystal wet product, dry the wet product in an oven at 90°C to obtain aluminum ammonium sulfate crystals;

[0026] 3) Add 10% ammonia water to the obtained aluminum ammonium sulfate crystals to obtain aluminum hydroxide gel, add deionized water to wash, and use ion ex...

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Abstract

The invention discloses a preparation method of high-purity aluminum oxide. The preparation method comprises the following steps of: with industrial Al2(SO4)3.18H2O and (NH4)2SO4 solids as raw materials, preparing an aluminum ammonium sulfate crystal by utilizing a recrystallization method; adding ammonia water to the obtained aluminum ammonium sulfate crystal to obtain an aluminum hydroxide gel; purifying with an aluminum-type mixed resin to obtain a high-purity aluminum hydroxide gel; distilling the obtained aluminum hydroxide gel at reduced pressure to obtain aluminum hydroxide colloidal particles; roasting the aluminum hydroxide colloidal particles for 1 to 2 hours at 1,000 to 1,200 DEG C through a muffle so as to obtain aluminum oxide powder. According to the preparation method, the aluminum ammonium sulfate crystal is prepared by utilizing the recrystallization method, so that the crystal has less impurity; and the prepared aluminum hydroxide sol is purified by the ion exchange resin to obtain the high-purity aluminum hydroxide gel, and then the high-purity aluminum hydroxide gel is roasted to obtain the aluminum oxide which is high in purity.

Description

technical field [0001] The invention relates to a method for preparing high-purity alumina. Background technique [0002] Alumina has a wide range of industrial uses. Commonly used metallurgical grade alumina is mainly suitable for the production of aluminum metal by dissolved salt electrolysis, and is also suitable for the production of corundum, ceramics, refractory materials and other alumina chemicals. However, for alumina used in phosphor powder, coatings, gemstones, high-pressure sodium lamp tubes, glass additives, electronic ceramics, catalyst carriers, etc., the impurity requirements are more stringent, and ordinary metallurgical-grade alumina cannot meet the use requirements, while traditional Industrialized alumina produced by Bayer method, soda lime sintering method or a combination of the two methods can only obtain Al due to raw material and process reasons. 2 o 3 Low content, impurity SiO 2 、Na 2 Ordinary alumina with high O content. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 张奎宏
Owner RUGAO CITY LEHENG CHEM COMPANY
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