Synthesis of sodium aluminate solution desilicifying additive and its use method

A synthesis method and additive technology, which are applied in the purification of aluminate/alumina/aluminum hydroxide and the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of reducing the circulation efficiency of the production process and the loss of alumina And other issues

Inactive Publication Date: 2006-05-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of lime will cause the loss of alumina in the solution, thereby reducing the cycle efficiency of the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Synthesis of additives. In the kind of mother liquor, all the alumina in the kind of mother liquor will generate 3CaO·Al 2 o 3 ·nH 2 A theoretical amount of O was added to the lime, and the reaction was carried out for 60 minutes at a temperature of 60°C. The solid phase obtained by filtration is the additive. The chemical analysis results show that the chemical composition of the desiliconization additive is: Al 2 o 3 , 22.00%; CaO, 49.44%; SiO 2 , 1.21%; burning reduction, 27.05%. The results of phase analysis showed that the main phase components of the synthetic desiliconization additive were: hydrated garnet, 3CaO·Al 2 o 3 ·(6~10)H 2 O and a small amount of Ca(OH) 2 .

Embodiment 2

[0018] Synthesis of additives. In the kind of mother liquor, all the alumina in the kind of mother liquor will generate 3CaO·Al 2 o 3 ·nH 2 A theoretical amount of O was added to the lime, and the reaction was carried out for 10 minutes at a temperature of 105°C. The solid phase obtained by filtration is the additive. The chemical analysis results show that the chemical composition of the desiliconization additive is: Al 2 o 3 , 22.01%; CaO, 49.34%; SiO 2 , 1.21%; burning reduction, 27.04%. The results of phase analysis showed that the main phase components of the synthetic desiliconization additive were: hydrated garnet, 3CaO·Al 2 o 3 ·(6~10)H 2 O and a small amount of Ca(OH) 2 .

Embodiment 3

[0020] Synthesis of additives. The other conditions were the same as in the example, and the reaction was carried out at 40° C. for 80 minutes. The solid phase obtained by filtration is the additive.

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Abstract

The invention relates to a method for synthesizing and using sodium aluminate solution desiliconizing additive, relating to a method for synthesizing and using sodium aluminate solution desiliconizing agent in the courses of producing alumina by sintering and by mixed connection, characterized in adding lime into the sorting mother solution in a theoretical quantity that alumina completely becomes 3CaO.Al2O3.nH2O, reacting 10-80 minutes at 40 deg.C-105 deg.C, filtering and the solid phase products are the desiliconizing additive. According to the CaO content of the synthetic additive, the synthetic additive is converted into the lime, and on the condition of the addition quantity the same as that of the lime, and the desiliconizing effect of the synthetic additive is somewhat better than that of the lime. Therefore, the synthetic additive can completely replace the lime and be used in the desiliconizing process of sodium aluminate solution in the producing course, so as to avoid the increase of confluent pulp alpha k caused by directly adding lime and the reduction of circulating efficiency.

Description

technical field [0001] The invention discloses a method for synthesizing and using a sodium aluminate solution desiliconization additive, and relates to a method for synthesizing and using a sodium aluminate solution desiliconization agent used in the production process of sintered alumina and the production process of mixed alumina. Background technique [0002] In the alumina production process, especially in the sintering or hybrid production process, it is often necessary to remove silicon from the sodium aluminate solution to ensure product quality. If it is necessary to desiliconize the crude liquid of the sintering method, the silicon content index (Al in sodium aluminate solution 2 o 3 and SiO 2 The mass ratio) is controlled in an appropriate range, and a high decomposition rate and a high output rate are obtained under the premise of ensuring product quality. [0003] In order to obtain a high silicon content index, it is necessary to add desiliconization additiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/47
Inventor 尹中林范卫东黄海波车洪生任光明
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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