Method for removing sodium in industrial alumina at high temperature

An industrial alumina and alumina technology, which is applied in the purification of aluminate/alumina/aluminum hydroxide, etc., can solve the problems that sodium in alumina cannot be effectively removed and the application range is narrow, so as to improve the competitiveness of enterprises, The process is simple and the effect of increasing added value

Inactive Publication Date: 2015-07-08
KUNMING METALLURGY INST
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Problems solved by technology

[0004] In view of the above-mentioned deficiencies, the present invention provides a method for high-temperature desalination of industrial alumina, which solves the technical obstacles such as inability to effectively remove sodium in alumina and narrow application range in the industrial alumina production industry, and provides a new method for the industrial alumina production industry. It provides a simple and effective new way to ensure the purity of its products and stable production at low cost

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  • Method for removing sodium in industrial alumina at high temperature

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Embodiment 1

[0021] 1) Weigh 100g of industrial alumina, put industrial alumina, hydrochloric acid and ammonium chloride into the container at a mass ratio of 100:3:3, and add corresponding water at the same time, the mass ratio of industrial alumina to water is 100:15, And mix well, put into the corundum crucible after mixing.

[0022] 2) Put the corundum crucible with the mixed industrial alumina into the electric furnace for calcination, the calcination temperature is 1100°C, keep it warm for 2 hours, and cool down to room temperature naturally.

[0023] 3) Wash the calcined industrial alumina under the ultrasonic field to remove Na, Ca, Mg and other elements remaining in the industrial alumina. The concentration of hydrochloric acid is 15g / l, the power of ultrasonic is 70 Hz, ammonium chloride 5g / l, liquid-solid mass ratio 3:1, washing temperature 60°C, washing twice and then filtering to obtain desodium alumina.

[0024] 4) The alumina after pickling-ultrasonic treatment was repeated...

Embodiment 2

[0026] 1) Weigh 100g of industrial alumina, put industrial alumina, hydrochloric acid and ammonium chloride into the container at a mass ratio of 100:4:4, and add corresponding water at the same time, the mass ratio of industrial alumina to water is 100:18, And mix well, put into the corundum crucible after mixing.

[0027] 2) Put the corundum crucible with the mixed industrial alumina into the electric furnace for calcination, the calcination temperature is 1200°C, keep it warm for 2.5h, and cool down to room temperature naturally.

[0028] 3) Wash the calcined industrial alumina under an ultrasonic field to remove Na, Ca, Mg and other elements remaining in the industrial alumina. The concentration of hydrochloric acid is 18g / l, the power of ultrasonic wave is 80 Hz, the ammonium chloride is 10g / l, the mass ratio of liquid to solid is 5:1, and the washing temperature is 70°C. After washing twice, filter to obtain desodium alumina.

[0029] 4) The alumina after pickling-ultra...

Embodiment 3

[0031] 1) Weigh 100g of industrial alumina, put industrial alumina, hydrochloric acid and ammonium chloride into the container at a mass ratio of 100:5:5, and add corresponding water at the same time, the mass ratio of industrial alumina to water is 100:20, And mix well, put into the corundum crucible after mixing.

[0032] 2) Put the corundum crucible with the mixed industrial alumina into the electric furnace for calcination, the calcination temperature is 1300°C, keep it warm for 3 hours, and cool down to room temperature naturally.

[0033] 3) Wash the calcined industrial alumina under an ultrasonic field to remove Na, Ca, Mg and other elements remaining in the industrial alumina. The concentration of hydrochloric acid is 25g / l, the power of ultrasonic wave is 90 Hz, the ammonium chloride is 15g / l, the mass ratio of liquid to solid is 6:1, and the washing temperature is 80°C. After washing twice, filter to obtain desodium alumina.

[0034] 4) The alumina after pickling-ul...

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Abstract

A method for high-temperature desodination of industrial alumina, the steps are: put industrial alumina raw materials, hydrochloric acid and ammonium chloride in a container at a mass ratio of 100:(3-10):(3-8), and simultaneously add corresponding Water, fully mixed to obtain industrial alumina with Cl-; calcining the industrial alumina with Cl-; cooling the industrial alumina obtained by calcining to room temperature, and acid-eluting sodium under ultrasonic field conditions; Wash the alumina after pickling-ultrasonic treatment with pure water for 1-2 hours until pH = 7.0, at a washing temperature of 60-90°C, and dry to obtain alumina with a sodium content of 0.0002-0.0005%. The invention solves technical obstacles such as ineffective removal of sodium in alumina and narrow application range in the industrial alumina production industry, and provides a simple and effective new way for the industrial alumina production industry to ensure product purity and low-cost stable production.

Description

technical field [0001] The invention belongs to the field of alumina production, and relates to a method for high-temperature desodination of industrial alumina. Background technique [0002] Most of the industrial alumina powder used in today's society is produced with bauxite as raw material by traditional Bayer process. However, the purity of the produced alumina is low due to the failure to effectively purify the impurities in the sodium aluminate. Many researchers have improved the purification of sodium aluminate and the desodination of alumina obtained after crystallization on the basis of the traditional Bayer process. By controlling the crystallization temperature, stirring speed and other conditions, the speed of aluminum hydroxide crystallization is controlled to avoid the formation of abnormal crystal nuclei and reduce the entry of impurities into aluminum hydroxide in the form of inclusions. Aluminum hydroxide is roasted and transformed to obtain industrial al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/46
Inventor 和晓才谢刚陈家辉李怀仁徐庆鑫魏可崔涛余强包崇军徐亚飞李永刚于站良李俊陈愚杨大锦陈加希
Owner KUNMING METALLURGY INST
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