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Method for decomposing sodium aluminate solution

A sodium aluminate solution technology, applied in the field of sodium aluminate solution decomposition, can solve the problems of long distance in industrial applications

Inactive Publication Date: 2008-05-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Except for a small part of these methods used in alumina production, most of them are in the laboratory research stage. There are still many problems in technology, equipment investment and economic rationality, and they are still far away from industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The test device uses two identical desktop decomposition tanks with an automatic temperature control system and a volume of 10 liters. # No. groove with 25000Hz ultrasonic irradiation device, 2 # No. groove without ultrasonic irradiation was used as a blank comparison test. Retrieve the decomposed raw solution from the seed tank of the alumina production site, retrieve the carbonized aluminum hydroxide from the carbon filter in the alumina plant as a seed crystal, analyze the composition of the raw solution and the moisture content of the carbonized aluminum hydroxide, and separate the two decomposition tanks The volume of the decomposition stock solution is 8 liters, the seed crystals are added at a seed ratio of 2.0, the initial decomposition temperature is 58°C, and the final decomposition temperature is 46°C. The cooling system simulates industrial production.

[0021] at 1 # ,2 # Add 8 liters of decomposition stock solution in the No. groove, and its composition...

Embodiment 2

[0023] The test device uses two identical desktop decomposition tanks with an automatic temperature control system and a volume of 10 liters. # No. groove with 35000Hz ultrasonic irradiation device, 2 # No. groove without ultrasonic irradiation was used as a blank comparison test. Retrieve the decomposed raw solution from the seed tank of the alumina production site, retrieve the carbonized aluminum hydroxide from the carbon filter in the alumina plant as a seed crystal, analyze the composition of the raw solution and the moisture content of the carbonized aluminum hydroxide, and separate the two decomposition tanks The volume of the decomposition stock solution is 8 liters, the seed crystals are added at a seed ratio of 2.0, the initial decomposition temperature is 60°C, and the final decomposition temperature is 43°C. The cooling system simulates industrial production.

[0024] at 1 # ,2 # Add 8 liters of decomposition stock solution in the No. groove, and its composition...

Embodiment 3

[0026] The test device uses two identical desktop decomposition tanks with an automatic temperature control system and a volume of 10 liters. # No. groove with 15000Hz ultrasonic irradiation device, 2 # No. groove without ultrasonic irradiation was used as a blank comparison test. Retrieve the decomposed raw solution from the seed tank of the alumina production site, retrieve the carbonized aluminum hydroxide from the carbon filter in the alumina plant as a seed crystal, analyze the composition of the raw solution and the moisture content of the carbonized aluminum hydroxide, and separate the two decomposition tanks The volume of the decomposition stock solution is 8 liters, the seed crystals are added at a seed ratio of 2.0, the initial decomposition temperature is 60°C, and the final decomposition temperature is 43°C. The cooling system simulates industrial production.

[0027] at 1 # ,2 # Add 8 liters of decomposition stock solution in the No. groove, and its composition...

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PUM

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Abstract

The invention relates to a decomposition method of sodium aluminate solution, and is characterized in that the sodium aluminate solution is processed by ultrasonic irradiation when the solution is decomposed. Compared with the existing chemical method, the prior art of alumina production is not changed in the invention, which has little investment in devices and little energy consumption and environment protection. The ultrasonic technology is introduced into Bayer process to for alumina production technique, which leads the technique to be simple, highly practical and effectively enhances the decomposition rate of seed and the product granularity of aluminum hydroxide. The crystal seed decomposition of the sodium aluminate solution is effectively strengthened, and the time for decomposition is shortened, while the decomposition rate is enhanced and the granularity distribution of the product is improved with good effect.

Description

technical field [0001] The invention relates to a method for decomposing sodium aluminate solution. Background technique [0002] The decomposition of sodium aluminate solution is one of the key processes in alumina production, and it is also the process that takes the longest time. It directly affects the process energy consumption indicators such as the alkali cycle efficiency and the amount of evaporated water, and also has a great impact on the physical and chemical performance indicators of the product. . The seeding process of sodium aluminate solution is a very complicated physical and chemical change process: including (1) Al(OH) 3 Crystal growth; (2) Al(OH) 3 Agglomeration of seed crystals; (3) Generation of secondary crystal nuclei; (4) Al(OH) 3 The four processes of cracking and wear of grains often occur at the same time, but the degree of occurrence is different in different stages of decomposition. In recent years, researchers have studied the method of str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04
Inventor 何静华刘保正海胜利刘伟张育新胡颖
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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