Production method of monocrystalline aluminum hydroxide

A technology of aluminum hydroxide and production method, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve problems such as changing high temperature Al, and achieve the effects of high hardness, low oil absorption rate and uniform particle size

Active Publication Date: 2011-05-25
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, to make a-Al 2 o 3 For alumina with high content, low sodium A1(OH) must be used 3 Or use appropriate additives to Na 2 O is reduced to a minimum, but tends to be altered by the effect of additives at high temperature Al 2 o 3 The application performance; some products require particle size range, need crushing and grading equipment, which needs to increase the cost

Method used

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  • Production method of monocrystalline aluminum hydroxide
  • Production method of monocrystalline aluminum hydroxide
  • Production method of monocrystalline aluminum hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The semen (caustic alkali Nk: 150g / L, alumina A: 170g / L) was decomposed by adding sodium oxalate at a higher temperature (85°C) under stirring conditions for 24 hours, then filtered and fully washed with hot water to obtain a filter cake Prepare the seed crystals for the next step of decomposition; add the seed crystals obtained in the first step to the semen to carry out a stirring decomposition reaction at a lower temperature (40~55°C), and filter and wash the product to obtain a single crystal aluminum hydroxide product.

[0019] Table 1 Test parameters and results of the present invention

[0020]

Embodiment 2

[0022] The semen (caustic alkali Nk: 130g / L, alumina A: 145g / L) was decomposed by adding sodium oxalate at a higher temperature (92°C) under stirring conditions for 10 hours, then filtered and fully washed with hot water to obtain a filter cake Prepare the seed crystals for the next step of decomposition; add the seed crystals obtained in the first step to the semen to carry out a stirring decomposition reaction at a higher temperature (81~92°C), and filter and wash the product to obtain a single crystal aluminum hydroxide product.

[0023] Table 2 Test parameters and results of the present invention

[0024]

Embodiment 3

[0026] The semen (caustic alkali Nk: 170g / L, alumina A: 189g / L) was decomposed by adding sodium oxalate at a higher temperature (85°C) under stirring conditions for 23 hours, then filtered and fully washed with hot water to obtain a filter cake Prepare the seed crystals for the next step of decomposition; add the seed crystals obtained in the first step to the semen to carry out a stirring decomposition reaction at a lower temperature (40~55°C), and filter and wash the product to obtain a single crystal aluminum hydroxide product.

[0027] Test parameter and result of the present invention of table 3

[0028]

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Abstract

The invention relates to a production method of monocrystalline aluminum hydroxide, in particular to a method for producing monocrystalline aluminum hydroxide by decomposing aluminate steel fine liquid in the production process of aluminum oxide. The method is characterized by comprising the following steps: (1) adding sodium oxalate into the sodium aluminate fine liquid to carry out decomposition reaction, filtering the decomposition product, and sufficiently washing the product with hot water to obtain seed crystals; and (2) adding the seed crystals obtained in the step (1) into the sodium aluminate fine liquid to carry out decomposition reaction, filtering the reaction product, and washing the product to obtain the monocrystalline aluminum hydroxide product. The monocrystalline aluminum hydroxide product prepared by the production method provided by the invention is transparent, has the characteristics of high hardness, uniform granularity, low oil absorption rate and the like, is micropowder filler with good properties, and can be used as the precursor of monocrystalline aluminum oxide granules; and the high chemical purity, granularity and physical and chemical properties of the monocrystalline aluminum hydroxide product can satisfy the production requirements of non-metallurgical level aluminum oxide, thus effectively lowering the production cost of non-metallurgical level aluminum oxide.

Description

technical field [0001] The invention discloses a production method of single-crystal aluminum hydroxide, which relates to a method for producing single-crystal aluminum hydroxide by decomposing aluminate steel semen in the alumina production process. Background technique [0002] At present, there are more than 300 varieties of non-metallurgical alumina, and the development of non-metallurgical alumina is rapid. Compared with the production of metallurgical alumina, the input required for the production of non-metallurgical alumina will not double as the price increase, thus significantly increasing the profit of the product. [0003] The non-metallurgical grade alumina market has certain requirements for product particle size or purity, and the precursor of the product is very important for subsequent processing, which not only affects the performance of the product, but also affects the cost control of the product. For example, to make a-Al 2 o 3 For alumina with high c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 娄世彬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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