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A kind of preparation method of high-performance activated alumina ball

An activated alumina, high-performance technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, inorganic chemistry, etc., can solve the problems affecting the product quality of alumina balls, poor strength of alumina balls, and shelling of alumina balls and other problems to achieve the effect of preventing shedding, improving quality, increasing specific surface area and pore volume

Active Publication Date: 2017-12-19
LUXI CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pseudo-boehmite will become non-adhesive jelly when it encounters water in industrial production, and it is difficult to form into balls with a turntable, while the alumina balls prepared by extrusion into balls have poor strength and high cost. and low output
Simply mix pseudo-boehmite with rho-alumina physically, and under the action of water, pseudo-boehmite can easily form large particles of jelly, which makes the alumina balls prepared by turning the disc into balls appear obvious shelling phenomenon , which seriously affects the product quality of alumina balls

Method used

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  • A kind of preparation method of high-performance activated alumina ball

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The rho-alumina and pseudo-boehmite prepared after the quick removal of aluminum hydroxide are added to a double-screw mixer and mixed evenly, the content of rho-alumina is 80% (%, mass fraction), and the pseudo-boehmite It is 20% (%, mass fraction). Among them, the pseudo-both alumina needs to be ground and sieved by a mechanical mill before being used. After sieving, the particle size can be adjusted according to production needs. Generally, the particle size of activated alumina balls is controlled at 325 mesh to 500 mesh. At the same time, a nitric acid solution with a concentration of 0.3% (%, mass fraction) was prepared for use.

[0035] The evenly mixed material of ρ-alumina powder and pseudo-boehmite powder is spirally and evenly put into the turntable ball forming machine from the feeding port, and the nitric acid solution is sprayed into the turntable of the turntable ball forming machine through the atomizing nozzle. Under the action of the centrifugal force...

Embodiment 2

[0040] Add the rho-alumina and pseudo-boehmite prepared after aluminum hydroxide quick removal into the twin-screw mixer, the content of rho-alumina is 75% (%, mass fraction), and the pseudo-boehmite is 25% % (%, mass fraction). Among them, the pseudo-both alumina needs to be ground and sieved by a mechanical mill before being used. After sieving, the particle size can be adjusted according to production needs. Generally, the particle size of activated alumina balls is controlled at 325 mesh to 500 mesh. At the same time, a citric acid solution of 0.5% (%, mass fraction) was prepared for use.

[0041] The mixed material of ρ-alumina powder and pseudo-boehmite powder is evenly put into the turntable ball forming machine by the feeding screw, and the citric acid solution is sprayed into the turntable through the atomizing nozzle. Under the action of the centrifugal force of the turntable, the rho-alumina powder and the pseudo-boehmite powder are bonded into green balls with a c...

Embodiment 3

[0043] Other parameters were the same as in Example 2, except that the acid solution was changed to acetic acid solution, and the concentration was 0.5% (%, mass fraction).

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Abstract

The invention discloses a preparation method of a high-performance activated alumina ball. The preparation method comprises the following steps: uniformly mixing 70 to 95 parts by weight of rho-alumina and 5 to 30 parts by weight of pseudo boehmite, and then putting a mixture in a balling pan for balling; spraying a bonding agent in a balling process, wherein the bonding agent is a desalting aqueous solution of organic acid / inorganic acid. The rho-alumina is used as a main production raw material, and the use amount of the rho-alumina is 75 percent or above, so that the mechanical strength of the activated alumina ball is guaranteed, and the cost of the product is reduced; the high-quality pseudo boehmite is added in the rho-alumina, so that the specific surface area and the pore volume of the activated alumina ball are effectively improved; the inorganic acid and the organic acid are added in the bonding agent, so that the surface of the pseudo boehmite and an acid solution react to generate alumina sol with the viscosity, the bonding of the pseudo boehmite and the rho-alumina is guaranteed, and the wear of an activated alumina ball product is reduced.

Description

technical field [0001] The patent of the present invention relates to a preparation method of high-performance activated alumina balls, in particular to a preparation method of activated alumina balls with high specific surface area, pore volume, strength and low wear rate. Background technique [0002] Alumina is an important chemical product, known as Al 2 o 3 There are 8 crystal forms, including χ-, η-, γ-, δ-, κ-, θ-, ρ- and α-Al 2 o 3 , their molecular formula can be written as Al 2 o 3 ·nH 2 O, where n represents the number of crystal water contained in alumina, and the crystal water content is between 0-0.6. Due to their different bulk density, pore volume, pore size and distribution, specific surface area and surface acidity, they have different applications in industry. In the absence of special instructions, the activated alumina used in industry generally refers to γ-Al 2 o 3 . [0003] Activated alumina is a pure alumina product, which has abundant inte...

Claims

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Application Information

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IPC IPC(8): C01F7/02
CPCC01F7/021C01F7/025C01P2006/12C01P2006/14
Inventor 李冰郭喜文王静王志强
Owner LUXI CATALYST
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