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A production process for preparing low-sodium boehmite

A technology of sodium boehmite and production process is applied in the field of production technology for preparing low-sodium boehmite, can solve the problems of high requirements, complicated operation process, unsuitable for industrial mass production and the like, and achieves high production efficiency, simple equipment, The effect of rich raw materials

Inactive Publication Date: 2017-12-05
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adds more admixtures and introduces new impurities, and the industrial alumina particles are required to be fine, with a median particle size of no more than 3 microns. The operation process is complicated and the requirements are high, so it is not suitable for industrial mass production.

Method used

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  • A production process for preparing low-sodium boehmite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 2Kg of industrial alumina powder (sodium oxide content is 0.41%) and 4L of distilled water to make a slurry and pour it into the reactor with stirring function. 2 Gas flow, so that the pressure in the kettle is controlled at 1MPa, open CO 2 Air valve, fill and deflate 3 times to remove the interference of excess gas in the kettle, start timing when the pressure in the kettle reaches 1MPa, discharge the material after maintaining the pressure for 0.5h, repeatedly suction filter the taken out slurry and fully wash it with distilled water to the pH of the filtrate =7, the filter cake after suction filtration was put into a drying oven and dried at 110°C for 12 hours to obtain low-sodium boehmite, which was detected by an X-ray fluorescence analyzer (XRF). The boehmite prepared in this example The sodium oxide content is 0.09%.

Embodiment 2

[0022] Mix 2Kg of industrial alumina powder (sodium oxide content is 0.41%) and 4L of distilled water to make a slurry and pour it into the reactor with stirring function. 2 Gas flow, so that the pressure in the kettle is controlled at 1MPa, open CO 2 Air valve, fill and deflate 3 times to remove the interference of excess gas in the kettle, start timing when the pressure in the kettle reaches 1MPa, discharge the material after keeping the pressure for 1 hour, repeatedly suction filter the taken out slurry and fully wash it with distilled water until the pH of the filtrate= 7. The filter cake after suction filtration was put into a drying oven and dried at 110° C. for 12 hours to obtain low-sodium boehmite, which was detected by XRF. The sodium oxide content of the boehmite prepared in this example was 0.09%.

Embodiment 3

[0024] Mix 2Kg of industrial alumina powder (sodium oxide content is 0.41%) and 4L of distilled water to make a slurry and pour it into the reactor with stirring function. 2 Gas flow, so that the pressure in the kettle is controlled at 1MPa, open CO 2 Air valve, fill and deflate 3 times to remove the interference of excess gas in the kettle, start timing when the pressure in the kettle reaches 1MPa, discharge the material after holding the pressure for 2 hours, repeatedly suction filter the taken out slurry with distilled water and fully wash it with distilled water until the filtrate pH=7, the filter cake after suction filtration was put into a drying box and dried at 110°C for 12 hours to obtain low-sodium boehmite and detected by XRF. The sodium oxide content of the boehmite prepared in this example was 0.11%.

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Abstract

The invention discloses a production method used for preparing low sodium boehmite taking common industrial aluminium oxide, gamma-Al2O3, as a raw material, and belongs to the field of ceramic material. The production method comprises following steps: industrial aluminium oxide powder is mixed with distilled water for pulpifying, an obtained mixture is delivered into a reaction kettle, CO2 is introduced into the reaction kettle until the pressure in the reaction kettle is as high as 1MPa, the pressure is maintained, a needed slurry is obtained via adjusting pressure maintaining time, solid-liquid separation is carried out, suction filtration and washing are carried out with distilled water, and drying is carried out so as to obtain the low sodium boehmite with sodium oxide content lower than 0.12%. The production method is capable of reducing the content of sodium oxide in the industrial aluminium oxide raw material; operation is simple; no pollution is caused; production efficiency is high; and the production method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a production process for preparing low-sodium boehmite. Background technique [0002] Boehmite is a hydroxide of aluminum (γ-AlOOH), which has twelve crystal forms such as α, β, γ, ρ, κ, δ, η, σ, χ and θ, and various advanced alumina ceramics Various low-sodium alumina products can be prepared from low-sodium boehmite as an important precursor. Low-sodium alumina has a very wide range of applications in many industries. Na in alumina products 2 The content of O will have a direct impact on the adsorption, catalysis, plasma sputtering, and arsenic removal of the product, and the high sodium content will be more harmful. Therefore, Na 2 O content has become an important technical index to characterize the quality grade of high temperature alumina. [0003] In addition, sodium oxide will react with alumina to form β-Al during high temperature calcination. 2 o 3 Na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
CPCC01F7/02C01P2002/72C01P2006/80
Inventor 赵萍高敏李长刚李卓辉刘继发
Owner QILU UNIV OF TECH