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Method for improving strength of activated alumina balls

A technology of activated alumina and aluminum hydroxide, applied in the field of activated alumina balls, can solve the problems of easily broken and pulverized activated alumina balls, insufficient strength of activated alumina balls, insufficient strength of activated alumina balls, etc. Insufficient strength, improved shedding, and effect of reducing wear rate

Active Publication Date: 2021-10-01
HANGZHOU ZHIHUAJIE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Activated alumina balls are mainly made by rolling ball method, oil ammonia ball forming method and spray granulation method. The products made by this process can meet most of the needs, but the scope of use has certain limitations, and the yield is not high. It is easy to appear that the strength of activated alumina balls is insufficient, resulting in the activated alumina balls being easily broken and pulverized during use. Therefore, the present invention provides a method for improving the strength of activated alumina balls to improve the strength of activated alumina balls. Insufficient shortcomings

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  • Method for improving strength of activated alumina balls
  • Method for improving strength of activated alumina balls
  • Method for improving strength of activated alumina balls

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Embodiment 1

[0045] The invention provides a technical solution: a method for improving the strength of activated alumina balls, comprising the following steps:

[0046] S1. Use a high-speed ball forming device to mix aluminum hydroxide powder, binder, bicarbonate, pseudoboehmite, cellulose forming agent and water to make activated alumina balls with a diameter of 1-3mm;

[0047] The obtaining method of aluminum hydroxide powder comprises the following steps:

[0048] S11, reacting sodium metaaluminate solution and 38% nitric acid solution to obtain aluminum hydroxide precipitate, the pH of which is 4-7 during precipitation, and the temperature is 0-10°C;

[0049] S12. Heating the aluminum hydroxide precipitate at 40-60°C for 3 hours, then keeping at 65-85°C for 3 hours, and finally drying at 90-110°C;

[0050] S13. Take out the dried aluminum hydroxide and pulverize it, and sieve the powder smaller than 200 meshes as the aluminum hydroxide powder for preparing activated alumina balls;

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Abstract

The invention discloses a method for improving the strength of activated alumina balls. The method comprises the following steps: S1, mixing aluminum hydroxide powder, an adhesive, bicarbonate, pseudo-boehmite, a cellulose forming agent and water by using a high-speed balling device to prepare activated alumina balls with the diameter of 1-3mm; s2, spraying pseudo-boehmite sol on the surfaces of the prepared activated alumina balls; and S3, putting the activated aluminum oxide balls sprayed with the pseudo-boehmite sol into a muffle furnace, and pressurizing for 1-3 hours under the air pressure of 1.5 MPa. According to the method, the bonding strength between the pseudo-boehmite is improved by spraying the pseudo-boehmite sol, so that the obtained spheres are more compact, the falling condition of the pseudo-boehmite powder is improved, and the activated aluminum oxide balls are pressurized by air pressure, so that the strength of the obtained activated aluminum oxide ball is improved by 24-35% compared with that of an ordinary aluminum oxide ball in the market, and the defect that the strength of activated aluminum oxide balls is insufficient is overcome.

Description

technical field [0001] The invention relates to the technical field of activated alumina balls, in particular to a method for improving the strength of activated alumina balls. Background technique [0002] The use of alumina in catalysts is usually called activated alumina. It is a porous, highly dispersed solid material with a large surface area. Its microporous surface has the characteristics required for catalysis, such as adsorption properties. , surface activity, excellent thermal stability, etc., so it is widely used as a catalyst and catalyst carrier for chemical reactions. [0003] Activated alumina balls are mainly made by rolling ball method, oil ammonia ball forming method and spray granulation method. The products made by this process can meet most of the needs, but the scope of use has certain limitations, and the yield is not high. It is easy to appear that the strength of activated alumina balls is insufficient, resulting in the activated alumina balls being...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B41/87C04B35/63C04B35/636
CPCC04B35/10C04B41/009C04B41/5031C04B41/87C04B35/6365C04B35/6303C04B2235/3201C04B2235/96C04B41/4537C04B41/0072
Inventor 郭林明郭铭忠
Owner HANGZHOU ZHIHUAJIE TECH
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