Method for removing sodium in industrial alumina at high temperature

An industrial alumina and alumina technology, which is applied in the direction of aluminate/alumina/aluminum hydroxide purification, can solve the problems of narrow application range and ineffective removal of sodium in alumina, so as to achieve simple process and improve enterprise efficiency. Competitiveness and the effect of reducing production costs

Inactive Publication Date: 2014-01-22
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 5 / 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 repeatedl...

Embodiment 2

[0027] 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.

[0028] 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.

[0029] 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, ammonium chloride is 10 / 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.

[0030] 4) The alumina after pickling-ultrasonic...

Embodiment 3

[0033] 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.

[0034] 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.

[0035] 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 15 / 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.

[0036] 4) The alumina after pickling-ult...

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Abstract

A method for removing sodium in industrial alumina at the high temperature comprises steps as follows: raw materials of industrial alumina, hydrochloric acid and ammonium chloride are placed in a container in the mass ratio of 100: (3-10): (3-8), simultaneously, a corresponding amount of water is added, and the mixture is fully mixed to obtain industrial alumina containing Cl<->; the industrial alumina containing Cl<-> is calcined; the calcined industrial alumina is cooled to the room temperature and subjected to acid pickling under the condition of an ultrasonic wave field; and the alumina subjected to acid pickling-ultrasonic wave treatment is washed for 1-2 hours by pure water at the washing temperature ranging from 60 DEG C to 90 DEG C until the pH is 7.0, the alumina is dried, and the alumina containing 0.0002%-0.0005% of sodium is obtained. By means of the method, the technical obstacles that sodium in industrial alumina in the production industry of industrial alumina cannot be effectively removed, the application range is small and the like are overcome, and a simple, effective and new way is provided for guaranteeing the product purity and realizing low-cost stabilizing production in the production industry of industrial alumina.

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 Applications(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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