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Method for in situ synthesis of periclase-magnesia-alumina spinel multiphase material

A technology of magnesia-aluminum spinel and synthesis method, applied in the directions of magnesia, alumina/aluminum hydroxide, etc., to achieve the effect of reducing energy consumption and saving production costs

Active Publication Date: 2012-10-03
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the relevant problems of the existing magnesium aluminum spinel synthesis method, to provide a kind of layered double hydroxide MgAl-LDH as a precursor, through low temperature roasting - intercalation reconstruction - in situ synthesis of square magnesium The method of stone-magnesia-aluminum spinel composite phase material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve magnesium nitrate and aluminum nitrate with a molar ratio of 3:1 in deionized water boiled for 10 minutes to prepare a mixed salt solution of magnesium nitrate and aluminum nitrate; dissolve sodium nitrate in deionized water boiled for 10 minutes Deionized water is prepared into a sodium nitrate solution with a molar concentration of 1.2mol / L; sodium hydroxide is dissolved in deionized water boiled for 10 minutes to prepare a sodium hydroxide solution with a concentration of 1mol / L;

[0022] (2) Drop the mixed salt solution and sodium hydroxide solution prepared in step (1) into the sodium nitrate solution prepared in step (1) by double titration, keep stirring, and control the pH value of the mixed solution to be 10, and the temperature is 60°C , after the titration, the prepared mixed solution was aged at 60° C. for 24 hours to obtain an intermediate product;

[0023] (3) The intermediate product obtained in step (2) was filtered, washed 10 times with dei...

Embodiment 2

[0031] (1) Dissolve magnesium nitrate and aluminum nitrate with a molar ratio of 4:1 in deionized water boiled for 10 minutes to prepare a mixed salt solution of magnesium nitrate and aluminum nitrate; dissolve sodium nitrate in deionized water boiled for 10 minutes Deionized water is prepared into a sodium nitrate solution with a molar concentration of 1.2mol / L; sodium hydroxide is dissolved in deionized water boiled for 10 minutes to prepare a sodium hydroxide solution with a concentration of 1mol / L;

[0032] (2) Drop the mixed salt solution and sodium hydroxide solution prepared in step (1) into the sodium nitrate solution prepared in step (1) by double titration, keep stirring, and control the pH value of the mixed solution to be 10, and the temperature is 60°C , after the titration, the prepared mixed solution was aged at 60° C. for 24 hours to obtain an intermediate product;

[0033] (3) The intermediate product obtained in step (2) was filtered, washed 10 times with dei...

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Abstract

The invention discloses a method for in situ synthesis of periclase-magnesia-alumina spinel multiphase material. The method comprises the following steps of: firstly, synthesizing layered double hydroxide by using a coprecipitation method; roasting the obtained layered double hydroxide at the temperature of 450-550DEG C for 2-5 hours to obtain mixed metallic oxide; placing the obtained mixed metallic oxide into 1.2mol / L sodium nitrate solution and magnetically stirring for 2-5 hours to reconstruct and obtain the layered double hydroxide; repeating the reconstruction for 3-5 times to obtain multiple reconstructed layered double hydroxides; roasting the obtained multiple reconstructed layered double hydroxides at the temperature of 800-1100DEG C for 2-5 hours to obtain a periclase-magnesia-alumina spinel multiphase powder material; and carrying out dry pressing on the obtained multiphase material at the 65MPa for 80 seconds and forming and sintering for 2 hours. The purities of chemicalraw materials are purities above chemical pure. According to the method disclosed by the invention, the synthetic temperature is lower, and thus the reduction of energy consumption is facilitated andthe cost is saved; and the volume density of the synthesized periclase-magnesia-alumina spinel multiphase material sintering body is 3.4-3.45g / cm<3>.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of spinel composite materials using clay minerals as precursors, in particular to a method for in-situ synthesis of periclase-magnesium-aluminum spinel composite materials using layered double hydroxides as precursors approach to materials. Background technique [0002] Magnesium aluminum spinel (MgAl 2 o 4 ) has the advantages of high melting point, high hardness, high thermal shock resistance, corrosion resistance, wear resistance, and small thermal expansion coefficient. As one of the important structural ceramic materials, it is widely used in metallurgy, chemistry, aerospace, military, atomic energy and other fields. In addition, magnesium aluminum spinel has excellent optical properties, radiation resistance, high temperature resistance and corrosion resistance, excellent electrical insulation, and chemical stability, and has become an important functional material. The natural magnesia-a...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F5/06
Inventor 王林江谢襄漓周翔马国斯易文龙
Owner GUILIN UNIVERSITY OF TECHNOLOGY