Method for continuously producing pseudoboehmite

A technology of pseudo-boehmite and sodium metaaluminate, applied in alumina/aluminum hydroxide and other directions, can solve the problems of large fluctuation of product quality, high labor intensity and low productivity, and achieve stable product quality and low labor intensity. , the effect of high production efficiency

Active Publication Date: 2013-12-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
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Problems solved by technology

[0012] In order to solve the problems of discontinuous production of pseudo-boehmite prepared by the existing carbonization method, high labor intensity, low productivity, and large fluctuations in product quality, the invention provides a method for continuously producing pseudo-boehmite, comprising:

Method used

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  • Method for continuously producing pseudoboehmite

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Embodiment 1

[0033] The sodium metaaluminate solution with an alumina concentration of 15.3g / L is continuously added to the reaction device through a pump, and a mixed gas of air and carbon dioxide is introduced. The volume percentage of carbon dioxide in the mixed gas is 30%, and the pressure of the mixed gas is 0.1MPa, so that the sodium metaaluminate solution forms a strong liquid flow and fully mixes with carbon dioxide gas to produce many and delicate bubbles; control the flow ratio of the mixed gas and sodium metaaluminate solution to 10, so that the temperature of the slurry generated by the reaction When the temperature is 25°C and the pH value is 9.5, the gelation is stopped; the slurry obtained from the reaction is transported to the aging tank through a pipeline that is long enough and has multiple U-shaped bends, and the temperature of the slurry is raised in the aging tank, and the aging temperature is 90°C ; Filter the aged slurry, wash the filter cake until neutral; dry the w...

Embodiment 2

[0035] The sodium metaaluminate solution with an alumina concentration of 23.5g / L is continuously added to the reaction device through a pump, and a mixed gas of air and carbon dioxide is introduced. The volume percentage of carbon dioxide in the mixed gas is 40%, and the pressure of the mixed gas is 0.12MPa, so that the sodium metaaluminate solution forms a strong liquid flow and fully mixes with carbon dioxide gas to produce many and delicate bubbles; control the flow ratio of the mixed gas and sodium metaaluminate solution to 30, so that the temperature of the slurry generated by the reaction When the temperature is 30°C and the pH value is 9.5, the gelation is stopped; the slurry obtained from the reaction is transported to the aging tank through a pipeline that is long enough and has multiple U-shaped bends, and the temperature of the slurry is raised in the aging tank, and the aging temperature is 95°C ; Filter the aged slurry, and wash the filter cake until neutral; dry ...

Embodiment 3

[0037] The sodium metaaluminate solution with an alumina concentration of 35.3g / L is continuously added to the reaction device through a pump, and a mixed gas of air and carbon dioxide is introduced. The volume percentage of carbon dioxide in the mixed gas is 50%, and the pressure of the mixed gas is 0.15MPa, so that the sodium metaaluminate solution forms a strong liquid flow and fully mixes with carbon dioxide gas to produce many and delicate bubbles; control the flow ratio of the mixed gas and sodium metaaluminate solution to 40, so that the temperature of the slurry generated by the reaction When the temperature is 35°C and the pH value is 10, the gelation is stopped; the slurry obtained from the reaction is transported to the aging tank through a pipeline that is long enough and has multiple U-shaped bends, and the temperature of the slurry is raised in the aging tank, and the aging temperature is 100°C ; Filter the aged slurry, and wash the filter cake until neutral; dry ...

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Abstract

The invention discloses a method for continuously producing pseudoboehmite, belonging to the technical field of boehmite preparation. The method comprises the following steps: continuously adding a sodium metaaluminate solution into a reactor while introducing an air-carbon dioxide gas mixture, and forming a strong liquid flow of the sodium metaaluminate solution to be thoroughly mixed with the carbon dioxide gas; controlling the flow rates of the gas mixture and the sodium metaaluminate solution to control the temperature of the slurry generated by reaction at 25-55 DEG C and the pH value at 9.5-11; and after the slurry passes through a pipeline with a plurality of U-shaped bends, aging the slurry, filtering, washing with water, and drying to obtain the pseudoboehmite. The pseudoboehmite prepared by the method has the characteristics of large specific area and pore volume, reasonable peptization, continuous production, simple technique, high production efficiency, stable product quality, low equipment investment, reliable operation, low energy consumption, low labor intensity and the like, is convenient to operate and maintain, and is especially suitable for producing common pseudoboehmite, superfine aluminum hydroxide or aluminum oxide.

Description

technical field [0001] The invention relates to the technical field of bauxite preparation, in particular to a method for continuously producing pseudo-boehmite. Background technique [0002] Pseudoboehmite, also known as monohydrate alumina, pseudo boehmite, is non-toxic, tasteless, odorless, white colloidal (wet product) or powder (dry product), with high crystal phase purity and good peptization performance , strong cohesiveness, high specific surface area, large pore volume, etc., and its water-containing state is a thixotropic gel. [0003] There are many production methods of pseudo-boehmite: Alcohol Alcohol method is often used in foreign countries at present, the product quality is high and the pore structure is easy to control, but the production cost is high and there is environmental pollution; currently the most economical and widely used in China is acid method or alkaline method. Industrial pseudo-boehmite production methods mainly include the following three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 丁安平武建生薛文忠朱小龙高晓辉张红莉李超樊文贞刘淑清
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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