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A method for solving the problem of cracking in water after mixed molding and roasting of alumina with different properties

A technology of mixed molding and alumina, which is applied in the field of cracking in water after mixed molding and roasting of alumina of different properties. It can solve the problems of increased resistance of the production system, great influence of catalyst preparation, and increased catalyst cost, so as to reduce stress concentration and increase Strength, the effect of improving binding ability

Active Publication Date: 2016-07-20
JIANGSU JINGJING NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The occurrence of the cracking problem has a great impact on the preparation of the catalyst. It will cause a substantial increase in the cost of the catalyst. If it is applied to the production process, it will cause an increase in the resistance of the production system, and it will cause serious shutdowns.

Method used

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  • A method for solving the problem of cracking in water after mixed molding and roasting of alumina with different properties

Examples

Experimental program
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Embodiment 1

[0024] This embodiment provides a method for solving the problem of cracking in water after mixed molding and roasting of alumina with different properties, which specifically includes the following steps:

[0025] (1) Self-made parameters are crystal water n=1.5~2.0, pore volume 0.8ml / g, specific surface area 500m 2 / g, bulk density 0.3 ~ 0.35g / ml pseudo-boehmite powder, the selected technical parameters are crystal water n=3.0, pore volume 0.21ml / g, specific surface area 80m 2 / g, bulk density of 1.05 ~ 1.10g / ml of aluminum hydroxide, pseudo-boehmite powder and aluminum hydroxide were sent to the pulverizer for crushing;

[0026] (2) Put the pulverized pseudo-boehmite powder and aluminum hydroxide powder in the mixer to fully mix to obtain a mixture. When mixing, the pseudo-boehmite powder with a small bulk density must be placed at the bottom of the mixer to ensure Good for mixing evenly;

[0027] (3) Rapidly dehydrate the mixed material through Venturi to obtain the orig...

Embodiment 2

[0034] This embodiment provides a method for solving the problem of cracking in water after mixed molding and roasting of alumina with different properties, which specifically includes the following steps:

[0035] (1) Self-made parameters are crystal water n=1.5~2.0, pore volume 0.8ml / g, specific surface area 500m 2 / g, bulk density 0.3 ~ 0.35g / ml pseudo-boehmite powder, the selected technical parameters are crystal water n=3.0, pore volume 0.21ml / g, specific surface area 80m 2 / g, bulk density of 1.05 ~ 1.10g / ml of aluminum hydroxide, pseudo-boehmite powder and aluminum hydroxide were sent to the pulverizer for crushing;

[0036] (2) Put the pulverized pseudo-boehmite powder and aluminum hydroxide powder in the mixer to fully mix to obtain a mixture. When mixing, the pseudo-boehmite powder with a small bulk density must be placed at the bottom of the mixer to ensure Good for mixing evenly;

[0037] (3) Rapidly dehydrate the mixed material through Venturi to obtain the raw ...

Embodiment 3

[0044] This embodiment provides a method for solving the problem of cracking in water after mixed molding and roasting of alumina with different properties, which specifically includes the following steps:

[0045] (1) Self-made parameters are crystal water n=1.5~2.0, pore volume 0.8ml / g, specific surface area 500m 2 / g, bulk density 0.3 ~ 0.35g / ml pseudo-boehmite powder, the selected technical parameters are crystal water n=3.0, pore volume 0.21ml / g, specific surface area 80m 2 / g, bulk density of 1.05 ~ 1.10g / ml of aluminum hydroxide, pseudo-boehmite powder and aluminum hydroxide were sent to the pulverizer for crushing;

[0046] (2) Put the pulverized pseudo-boehmite powder and aluminum hydroxide powder in the mixer to fully mix to obtain a mixture. When mixing, the pseudo-boehmite powder with a small bulk density must be placed at the bottom of the mixer to ensure Good for mixing evenly;

[0047] (3) Rapidly dehydrate the mixed material through Venturi to obtain the orig...

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Abstract

The invention discloses a method for solving water bursting of alumina of different properties after mixing, shaping and roasting. According to the method, pseudo-boehmite powder and aluminum hydroxide are taken as raw materials and are crushed, mixed, shaped and roasted, and an acidity additive and a surfactant are added into the machining shaping process, so that the bonding capacity among alumina of different properties is greatly improved, the internal stress concentration of pore structures of alumina in the roasting process is alleviated, and the bursting problem caused by different adsorption stresses of different alumina in water is avoided; and meanwhile, by virtue of the surfactant, the stress concentration of pores in the roasting process is reduced, the sintering and the collapsing of the pores are avoided, the bursting situation is reduced, and the pore volume and the specific surface area of alumina are beneficially increased.

Description

technical field [0001] The invention relates to the field of fine chemical synthesis, in particular to a method for solving the problem of water bursting after aluminum oxides with different properties are mixed, molded and roasted. Background technique [0002] Different chemical reactions have different requirements on the pore structure, specific surface area, bulk density and strength of the catalyst support. Generally speaking, chemical reactions with small molecular volumes require smaller pore diameters and higher specific surface areas, while chemical reactions with larger molecular volumes require larger pore diameters and smaller specific surface areas. But the requirements for bulk density and strength are: the lighter the bulk density, the higher the strength, the better. However, in the actual process, the lighter the bulk density, the lower the strength, and there is a certain contradiction between the two. [0003] In the face of millions of chemical reactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/63C04B35/622
Inventor 俞杰李国印张海伦李殿卿冯拥军
Owner JIANGSU JINGJING NEW MATERIALS
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