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Method for preparing magnesium-aluminum hydrotalcite

A hydrotalcite and magnesium-aluminum technology, which is applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of high product cost and restrictions on the promotion and application of materials, and achieve low production cost, which is conducive to environmental improvement and protection, and has no The effect of three waste discharge

Inactive Publication Date: 2012-08-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although relevant research has received extensive attention, the industrial production of materials is still subject to many restrictions. The commonly used co-precipitation synthesis method is due to production wastewater treatment, energy consumption and other reasons, and the cost of related products produced in industrial production is relatively high. Restricted

Method used

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  • Method for preparing magnesium-aluminum hydrotalcite
  • Method for preparing magnesium-aluminum hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Mix magnesium hydroxide and gibbsite at a molar ratio of 3:1;

[0017] 2) Put the above mixture into a high-speed ball mill and mill for 3 hours, wherein the mass ratio of the mixture to the steel balls of the ball mill is 1:3; the steel balls of the ball mill are steel balls with a particle size of 4 mm and steel balls with a particle size of 6 mm, of which 4 mm steel balls The mass ratio of the ball to the 6mm steel ball is 3:7;

[0018] 3) Put the ground mixture in a muffle furnace and bake it at 450°C for 3 hours to obtain a uniformly dispersed magnesium-aluminum mixed oxide;

[0019] 4) Add the above-mentioned magnesium-aluminum mixed oxide to 3 times the mass of water at 50°C, and react for 26 hours to obtain magnesium-aluminum hydrotalcite.

Embodiment 2

[0021] 1) Mix magnesium hydroxide and gibbsite at a molar ratio of 5:1;

[0022] 2) Put the above mixture into a high-speed ball mill and mill for 5 hours, wherein the mass ratio of the mixture to the steel balls of the ball mill is 1:3; The mass ratio of the ball to the 6mm steel ball is 3:7;

[0023] 3) Put the ground mixture in a muffle furnace and bake it at 550°C for 3 hours to obtain a uniformly dispersed magnesium-aluminum mixed oxide;

[0024] 4) Add the above-mentioned magnesium-aluminum mixed oxide to 5 times the mass of water at 80°C, and react for 24 hours to obtain magnesium-aluminum hydrotalcite.

Embodiment 3

[0026] 1) Mix magnesium hydroxide and gibbsite at a molar ratio of 1:1;

[0027] 2) Put the above mixture into a high-speed ball mill and mill for 2 hours, wherein the mass ratio of the mixture to the steel balls of the ball mill is 1:3; the steel balls of the ball mill are steel balls with a particle size of 4 mm and steel balls with a particle size of 6 mm, of which 4 mm steel balls The mass ratio of the ball to the 6mm steel ball is 3:7;

[0028] 3) Put the ground mixture in a muffle furnace and bake it at 380°C for 5 hours to obtain a uniformly dispersed magnesium-aluminum mixed oxide;

[0029] 4) Add the above-mentioned magnesium-aluminum mixed oxide into water at 20° C. twice the mass, and react for 30 hours to obtain magnesium-aluminum hydrotalcite.

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Abstract

The invention discloses a method for preparing magnesium-aluminum hydrotalcite. Magnesium-aluminum hydroxide is subjected to ball milling, mixing, drying, calcination and dehydration to obtain mixed oxide even in magnesium and aluminum, and the mixed oxide is contacted with water and then is directly regained into the magnesium-aluminum hydrotalcite. Compared with existing synthetic methods, the method has the advantages that the synthetic method is simple, the production cost is low, and large-scale industrialized production is easily achieved. In addition, three wastes (waste gas, waste water and waste residues) are not discharged in the production process, and the method is environment-friendly and facilitates environmental improvement and protection.

Description

technical field [0001] The invention relates to a preparation method of magnesium-aluminum hydrotalcite, in particular to a preparation method of magnesium-aluminum hydrotalcite formed by uniformly dispersed mixed oxides and water. Background technique [0002] Hydrotalcite-like materials are an important class of anionic clay materials, widely used in catalyst materials, adsorption materials, oil drilling mud, medicine, flame retardants and other fields. Although relevant research has received extensive attention, the industrial production of materials is still subject to many restrictions. The commonly used co-precipitation synthesis method is due to production wastewater treatment, energy consumption and other reasons, and the cost of related products produced in industrial production is relatively high. The promotion and application of materials Restricted. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the problem to be solved by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00
Inventor 苏继新李群刘思明张志轩张明博董斐斐贾洪玉
Owner SHANDONG UNIV
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