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Method for producing aluminum hydroxide by using diethylene glycol

A technology for shrinking diethylene glycol and aluminum hydroxide, which is applied in the direction of alumina/aluminum hydroxide, can solve the problems of increasing the amount of seeds added and difficulty in effect, and achieve the effect of improving the decomposition rate

Inactive Publication Date: 2011-05-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method of industrially strengthening the decomposition process of seed crystals is to reduce the caustic ratio of the eluate, increase the amount of seeds added, purify the solution and remove impurities such as organic matter, and rationally organize the decomposition and cooling process. These measures are in industrial production. have achieved certain effects, but it is very difficult to further improve their effects

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  • Method for producing aluminum hydroxide by using diethylene glycol
  • Method for producing aluminum hydroxide by using diethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] like figure 1 As shown, the method of utilizing diethylene glycol to produce aluminum hydroxide provided by the embodiments of the present invention has the following steps:

[0020] Step 1, to Al 2 o 3 Diethylene glycol is slowly added to the Bayer semen sodium aluminate solution with a concentration of 80g / L and a caustic ratio of 3.11, and the volume ratio of the two solutions is Bayer semen sodium aluminate solution:diethylene glycol =1:1;

[0021] Step 2. Put the mixed solution above in a container kept at 25° C. and stir for 12 hours to stop the reaction; crystallize aluminum hydroxide.

[0022] Step 3, the reaction product obtained in the above steps is subjected to liquid-solid separation, the solid phase is aluminum hydroxide, and the liquid phase can be used as the Bayer process mother liquor;

[0023] The solid phase was washed three times with 80°C distilled water and then dried at 90°C to obtain aluminum hydroxide, which was superfine aluminum hydroxide...

Embodiment 2

[0026] Step 1, to Al 2 o 3 Diethylene glycol is slowly added to the Bayer semen sodium aluminate solution with a concentration of 170g / L and a caustic ratio of 1.36, and the volume ratio of the two solutions is Bayer semen sodium aluminate solution:diethylene glycol =1:1;

[0027] Step 2. Put the mixed solution above in a container kept at 40° C. and stir for 1.0 hour to stop the reaction; crystallize aluminum hydroxide.

[0028] Step 3, liquid-solid separation is carried out to the reaction product obtained in the above steps, the solid phase is aluminum hydroxide and the liquid phase can be used as the Bayer method mother liquor;

[0029] The solid phase was washed three times with distilled water at 80°C and then dried at 90°C to obtain aluminum hydroxide, which was superfine aluminum hydroxide with an average particle size of 5.4 μm. At the same time, the Bayer process semen sodium aluminate was decomposed in this example The rate is 93.76%, and the caustic ratio of mot...

Embodiment 3

[0031] Step 1, to Al 2 o 3 Diethylene glycol is slowly added to the Bayer semen sodium aluminate solution with a concentration of 180g / L and a caustic ratio of 1.35, and the volume ratio of the two solutions is Bayer semen sodium aluminate solution:diethylene glycol =1:0.25;

[0032] Step 2. Put the above mixed solution in a container kept at 30° C. and stir for 24 hours to stop the reaction; crystallize aluminum hydroxide.

[0033] Step 3, liquid-solid separation is carried out to the reaction product obtained in the above steps, the solid phase is aluminum hydroxide and the liquid phase can be used as the Bayer process mother liquor;

[0034] The solid phase was washed three times with distilled water at 80°C and then dried at 90°C to obtain aluminum hydroxide, which was superfine aluminum hydroxide with an average particle size of 6.1 μm, and at the same time, the Bayer process semen sodium aluminate was decomposed in this example The rate is 72.78%, and the caustic rati...

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Abstract

The invention discloses a method for producing aluminum hydroxide by using diethylene glycol, comprising the steps of: mixing Bayer semen with diethylene glycol; stirring the mixed liquid to ensure that aluminum hydroxide is crystallized and precipitated; and carrying out liquid-solid separation to obtain the aluminum hydroxide. In the invention, hydrogen bonds are formed through ether-chain oxygen atoms and hydroxyls in added additives and hydroxyls of A1(OH)4- so as to promote the precipitation of aluminate anions; and the formation of the hydrogen bonds causes the phenomenon of uneven distribution of charge densities to the A1(OH)4- so that the A1-O bonds are fragile so as to strengthen the decomposition of the aluminate anions and the decomposition ratio of sodium chlorate in Bayer process is improved.

Description

technical field [0001] The invention relates to the technical field of alumina metallurgy, in particular to a method for producing aluminum hydroxide from Bayer semen using diethylene glycol. Background technique [0002] Aluminum hydroxide is widely used. In industry, it is mainly roasted to produce alumina, which is used as the raw material of electrolytic aluminum. It is also used in medicine, toothpaste, flame retardant, agate, catalyst and electronic products. [0003] The decomposition of sodium aluminate solution seed crystals is one of the key processes in the production of alumina by the Bayer process. It takes the longest time (36-72 hours), not only needs to add a large number of seeds (the seed crystal coefficient is 1-3), but also the decomposition rate is generally low. More than 55%, far below its theoretical decomposition rate, making it one of the bottlenecks in the development of alumina production technology. If appropriate measures can be taken to stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 杨会宾张之强付翠霞李韶辉潘明亮薛忠秀王晓锋戚丽娜
Owner GUIZHOU BRANCH CHINA ALUMINUM IND