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Method for preparing bauxite substrate MgAION

A technology of bauxite and high-alumina bauxite is applied in the field of preparation of high-alumina bauxite through aluminothermic nitridation reduction to synthesize MgAlON, which can solve the problem of high cost, achieve the effects of short time, increase added value and reduce manufacturing cost

Inactive Publication Date: 2004-03-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above three methods all use alumina as the main raw material to synthesize MgAlON, and the cost is relatively high.

Method used

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  • Method for preparing bauxite substrate MgAION
  • Method for preparing bauxite substrate MgAION
  • Method for preparing bauxite substrate MgAION

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw vanadium, metal aluminum, and magnesium oxide are mixed according to the weight ratio of 65%, 30%, and 5%, respectively, and put into a ball mill jar, and dry-mixed evenly; take out the mixed powder and use 8% polyvinyl alcohol as a bond Agent, 70MPa machine press molding, drying at 80°C; then put it into the atmosphere sintering furnace, carry out nitriding sintering in the flowing nitrogen atmosphere, the sintering temperature is 1550°C, keep the temperature for 8 hours; cool down to 700°C and turn off the nitrogen, Continue to cool down to room temperature and take it out to obtain MgAlON blocks, which can be crushed and finely ground to obtain MgAlON granules and powders.

[0025] The XRD analysis figure of product in the present embodiment is as follows figure 1 shown. According to XRD analysis, the main crystal phase of the product is MgAlON. After testing, the nitrogen content is 6.01wt%, and the crystal grain size is less than 2 μm.

Embodiment 2

[0028] Raw bauxite, metal aluminum (as reducing agent), MgAl 2 o 4 After batching according to the weight ratio of 62:24:14, put them into a ball mill tank, and dry mix them evenly; take out the mixed powder, use 8% polyvinyl alcohol as a binder, machine press at 70MPa, and dry at a temperature of 80°C; Then put it into an atmosphere sintering furnace, carry out nitriding sintering in a flowing nitrogen atmosphere, the sintering temperature is 1550°C, and keep the temperature for 8 hours; cool down to 700°C and turn off the nitrogen, continue to cool down to room temperature and take it out to obtain MgAlON block material, broken fine After grinding, MgAlON pellets and powders can be obtained.

[0029] The XRD analysis pattern of product in the present embodiment is as follows figure 2 shown. According to XRD analysis, the main crystal phase of the product is MgAlON. After testing, the nitrogen content is 9.00wt%, and the crystal grain size is less than 2 μm.

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Abstract

The present invention provides the preparation process of alumina-base MgAlON and features that high-aluminum alumina mixed with proper amount of metal aluminum powder and small amount of MgO is formed and fast nitrided, reduced and synthesized in a low temperature alumiothermic course to form alumina-base MgAlON with high nitrogen content and fine crystal size. The material of the present invention has high nitrogen content, fine crystal size, high mechanical performance and fireproof performance, excellent slag resistance and low cost, and may be used widely in high quality refractory material and ceramic product for metallurgy, chemical industry and ceramic industry.

Description

[0001] Field: [0002] The invention relates to a preparation method of raw materials for ceramics or refractory materials, in particular to a preparation method for synthesizing MgAlON from high alumina bauxite through aluminothermic nitriding reduction. Background technique: [0003] MgAlON is a new type of ceramic material with excellent chemical and mechanical properties, so it is widely used in high-tech ceramics and refractory materials, especially in the field of refractory materials. MgAlON composite refractory materials have good resistance Slag performance, anti-steel erosion performance, so as to meet the requirements of smelting high-quality ultra-pure steel, and avoid pollution caused by the use process, it is expected to replace carbon-containing refractory materials for smelting pure steel; in addition, due to the excellent MgAlON composite material Corrosion resistance, is expected to be widely used in nonferrous metallurgy and chemical industry. [0004] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/10C04B35/622
Inventor 钟香崇杨道媛叶方保郭新荣
Owner ZHENGZHOU UNIV