Method for preparing spherical alumina particles by alginic acid auxiliary forming method

A spherical alumina, auxiliary molding technology, applied in the preparation of alumina/hydroxide, etc., can solve the problems of high energy consumption, slow curing speed, environmental pollution, etc. of the oil column molding method, and achieve high production efficiency, convenient operation, Simple preparation process

Active Publication Date: 2012-10-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing oil column molding method, such as high energy consumption, slow curing

Method used

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  • Method for preparing spherical alumina particles by alginic acid auxiliary forming method
  • Method for preparing spherical alumina particles by alginic acid auxiliary forming method
  • Method for preparing spherical alumina particles by alginic acid auxiliary forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing spherical alumina particles by an alginic acid-assisted molding method, comprising the steps of:

[0028] (1) Take 50g of pseudo-boehmite, add 70ml of water to disperse, then add 70ml of sodium alginate aqueous solution with a mass concentration of 3%, and stir to form a sodium alginate-pseudo-boehmite suspension;

[0029] (2) Drop the sodium alginate-pseudoboehmite suspension into an aqueous solution of aluminum nitrate with a concentration of 0.3M and pH=3, and the gel will form a composite of alginate-pseudoboehmite gel in 40 minutes. small ball;

[0030] (3) After the alginic acid-pseudoboehmite glue composite pellets were washed with water and dried, they were calcined at 600° C. for 4 hours to obtain spherical alumina particles. The particle properties are listed in Table 1.

Embodiment 2

[0032] A method for preparing spherical alumina particles by an alginic acid-assisted molding method, comprising the steps of:

[0033] (1) Take 20g of pseudo-boehmite, add 50ml of water to disperse, then add 50ml of sodium alginate aqueous solution with a mass concentration of 4%, and stir to form a sodium alginate-pseudo-boehmite suspension;

[0034] (2) Drop the sodium alginate-pseudoboehmite suspension into an aqueous solution of calcium nitrate with a concentration of 1.0M and pH=2, and form a composite of alginate-pseudoboehmite gel after 30 minutes small ball;

[0035] (3) After the alginic acid-pseudoboehmite glue composite pellets were washed with water and dried, they were calcined at 500° C. for 8 hours to obtain spherical alumina particles. The particle properties are listed in Table 1.

Embodiment 3

[0037] A method for preparing spherical alumina particles by an alginic acid-assisted molding method, comprising the steps of:

[0038] (1) Take 70g of pseudo-boehmite, add 100ml of water to disperse, then add 100ml of sodium alginate aqueous solution with a mass concentration of 2%, and stir to form a sodium alginate-pseudoboehmite suspension;

[0039] (2) Drop the sodium alginate-pseudoboehmite suspension into an aqueous solution of barium nitrate with a concentration of 0.5M and pH=2, and the gel will form a composite of alginate-pseudoboehmite gel in 60 minutes small ball;

[0040] (3) After the alginic acid-pseudoboehmite glue composite pellets were washed with water and dried, they were calcined at 800° C. for 5 hours to obtain spherical alumina particles. The particle properties are listed in Table 1.

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Abstract

The invention discloses a method for preparing spherical alumina particles by an alginic acid auxiliary forming method. The method includes the following steps of firstly, taking pseudo-boehmite, adding water for dispensing, and then adding a sodium alginate aqueous solution to stir to form a sodium-alginate-pseudo-boehmite suspension; secondly, dropping the sodium-alginate-pseudo-boehmite suspension into an aqueous solution of aluminum, calcium, barium, copper, zinc, manganese or cobalt metal ion, and forming alginic-acid-pseudo-boehmite rubber composite pellets in a gel mode; and thirdly, subjecting the alginic-acid-pseudo-boehmite rubber composite pellets to a washing by water, a drying and a calcination to obtain the spherical alumina particles. According to the method for preparing the spherical alumina particles, the forming of the particles is performed in mild aqueous phase, the energy consumption is low, the pollution is absent during a preparation process, the production efficiency is high, the specific surface area, the pore volume, the pore diameter and the metallic oxide content of the spherical alumina can be conveniently adjusted, the preparation process is simple, the operation is convenient, and the industrial production is easy to achieve.

Description

technical field [0001] The invention relates to a method for preparing spherical alumina particles, more specifically, the invention relates to a method for preparing spherical alumina particles by an alginic acid-assisted molding method. Background technique [0002] Metal oxides, especially composite metal oxides, are widely used as catalysts, catalyst supports, Materials such as adsorbents and immobilized enzymes. Alumina has been widely used in many catalytic fields because of its special structure and excellent performance. Spherical alumina is one of the most commonly used supports. Pseudoboehmite is an important precursor for the preparation of alumina. It has good peptization properties and can turn into a translucent pseudosol when it encounters acid. This sol can turn into a gel in an alkaline environment. When people are studying spherical alumina forming methods, using the principle of sol-gel phase transition of pseudo-boehmite, they have developed methods su...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 王康杨文建王希涛
Owner TIANJIN UNIV
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