Preparation of pseudo thinolite

A technology of pseudo-boehmite and sodium meta-aluminate, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, alumina/aluminum hydroxide, etc., can solve the difference in particle performance, pseudo-boehmite The pore size distribution of stone products is not very concentrated, which achieves the effect of short gel formation time, easy operation and promotion and application.

Active Publication Date: 2005-02-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Description
  • Claims
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Problems solved by technology

In this method, since the residence time refers to the average residence time, the residence of some individual pseudo-boehmite particles in the reaction system may deviate far from this time, which will also cause differences in the properties of these particles, and the reaction to pseudo-boehmite The pore size distribution of stone products is not very concentrated

Method used

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  • Preparation of pseudo thinolite

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Embodiment 1

[0027] Get the sodium metaaluminate solution in the sintering method alumina production, the concentration of this solution is Al 2 o 3 The content is 110g / l, the caustic ratio is 1.45, filtered, cooled and set aside.

[0028] Add 2L of deionized water with a temperature of 15°C and a pH value of 7 into a 5L reactor, pass through the bottom of the reactor with carbon dioxide with a volume concentration of 50%, and immediately add 400ml of the above-mentioned metaaluminic acid at a temperature of 23°C to the reactor Add the sodium solution in 4.5 minutes. At this time, the pH value of the reaction system is 11.0. Rapidly increase the air flow, so that the reaction drops to a pH value of 9.5 within 6 minutes. Separate, wash with 80°C deionized water three times, and dry at 110°C Dry to obtain pseudo-boehmite. Product pore volume 1.106ml / g, specific surface area 406.4m 2 / g, 92.5% of the pores between 40 and 150 angstroms.

Embodiment 2

[0030] According to the method of embodiment 1, the difference is that the sodium metaaluminate solution of 500ml starts to be added after feeding carbon dioxide, and the addition is completed in 6 minutes. At this time, the pH value of the reaction system is 11.4. Within minutes, the pH value is reduced to 9.8 to obtain pseudo-boehmite. Product pore volume 1.080ml / g, specific surface area 396.0m 2 / g, 91.4% of the pores between 40 and 150 angstroms.

Embodiment 3

[0032] According to the method of embodiment 1, the difference is that the sodium metaaluminate solution of 800ml starts to be added after feeding carbon dioxide, and the addition is completed in 7.5 minutes. At this time, the pH value of the reaction system is 12.0. Within minutes, the pH value is reduced to 10.2 to obtain pseudo-boehmite. Product pore volume 0.995ml / g, specific surface area 385.6m 2 / g, 88.9% of the pores between 40 and 150 angstroms.

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Abstract

An improved process for preparing alpha-ALO(OH) includes such steps as introducing CO2 to water, adding sodium metaaluminate solution, crystallizing, separating crystal from slurry, washing, and drying.

Description

technical field [0001] The invention relates to an improved preparation method of pseudo-boehmite, belonging to the technical field of non-metallurgical alumina preparation. Background technique [0002] Pseudo-boehmite belongs to boehmite with imperfect crystallization, and its performance is closely related to its crystallization degree. [0003] There are many methods for producing pseudo-boehmite, which are generally divided into aluminum alcohol hydrolysis method and neutralization method. The method of using sodium metaaluminate solution and carbon dioxide to react to generate pseudo-boehmite can be regarded as a neutralization method using carbon dioxide as an acid source. The difference between it and the neutralization method is that the reaction process will not be carried out under acidic conditions. Sodium metaaluminate-carbon dioxide (carbonization method) produces pseudo-boehmite, which is more suitable for grafting on alumina, especially the production of sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/14
Inventor 袁崇良张少华张丽李广战王强张艳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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