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Wet sintering production method for alumina-based magnesium aluminate spinel

A magnesium-alumina-based spinel and production method technology, applied in the field of refractory material production, can solve the problems of low main crystal phase content, low bulk density, high sintering temperature, etc., achieve uniform composition, ensure green body strength, and be easy to split open effect

Inactive Publication Date: 2014-03-26
SANMENXIA XINYANGSHAO SYNTHETIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production process not only has the disadvantages of high energy consumption, poor production environment, and high labor intensity due to the difficulty in grinding the particle size to a certain extent, but also has the disadvantages of high sintering temperature, low content of main crystal phase after sintering, and low bulk density due to dry production. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using industrial alumina and light burnt magnesia as raw materials, the production method of wet sintering alumina-based magnesia-aluminum spinel comprises the following steps:

[0021] a: After batching 50% γ-alumina and 50% light burnt magnesia according to mass percentage, add water 1.5 times the total mass of alumina and light burnt magnesia and 0.1% polyvinyl alcohol (viscosity 15 mpa s ), grinding in a wet ball mill, and according to the particle fineness analysis of the material in the mud, grind for 10 hours and release the slurry. After grinding, the size of the mud particles is 500 mesh and less than 0.5% (mass), and the mud A is obtained after grinding;

[0022] b: Pump the mud A into the filter press for dehydration with a mud pump, and adjust the filter mud pressure (not greater than 2.5Mpa) according to the water content of the mud cake obtained by pressing the filter. After 10 minutes, the mud cake B is obtained;

[0023] c: Vacuum mud refining: Use a vac...

Embodiment 2

[0027] Using industrial alumina and light burnt magnesia as raw materials, the production method of wet sintering alumina-based magnesia-aluminum spinel comprises the following steps:

[0028] a: After batching 65% γ-alumina and 35% light burnt magnesia according to mass percentage, add water 1.2 times the total mass of alumina and light burnt magnesia and 0.2% polyvinyl alcohol (viscosity 20 mpa s ), grinding in a wet ball mill, and according to the particle fineness analysis of the material in the mud, grind for 10 hours and release the slurry. After grinding, the size of the mud particles is 500 mesh and less than 0.5% (mass), and the mud A is obtained after grinding;

[0029] b: Pump the mud A into the filter press for dehydration with a mud pump, adjust the filter mud pressure (not greater than 2.5MPa) according to the mud cake water obtained by the press filtration, and obtain the mud cake B after 10 minutes;

[0030] c: Vacuum mud refining: Use a vacuum extruder with a ...

Embodiment 3

[0034] Using industrial alumina and light burnt magnesia as raw materials, the production method of wet sintering alumina-based magnesia-aluminum spinel comprises the following steps:

[0035] a: After batching 78% α-alumina and 22% calcined magnesia according to mass percentage, add water 1.2 times the total mass of alumina and calcined magnesia and 0.3% polyvinyl alcohol (viscosity 30mpa·s) , Grinding in a wet ball mill, according to the particle fineness analysis of the material in the mud, grinding for 10 hours to release the slurry, the slurry particle size after grinding is 500 mesh and less than 0.5% (mass), and the slurry A is obtained after grinding;

[0036] b: Pump the mud A into the filter press for dehydration with a mud pump, adjust the filter mud pressure (not greater than 2.5MPa) according to the mud cake water obtained by the press filtration, and obtain the mud cake B after 10 minutes;

[0037] c: Vacuum mud refining: Use a vacuum extruder with a vacuum degre...

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Abstract

The invention belongs to the technical field of refractory material production, in particular to a wet sintering production method for alumina-based magnesium aluminate spinel. The method comprises the following steps: preparing 50-80% alumina and 20-50% caustic-calcined magnesite by mass percent; adding water of which the mass is 1.2-1.5 times of the total mass of the alumina and the caustic-calcined magnesia, and 0.1-0.3% polyvinyl alcohol, obtaining slurry A by grinding; allowing the slurry A to be subject to dehydration, vacuum pugging, drying and sintering to obtain the alumina-based magnesium aluminate spinel. According to the invention, a traditional dry production technology is changed. The prepared alumina-based magnesium aluminate spinel is high in crystalline phase content, large in volume density and low in water absorption rate.

Description

technical field [0001] The invention belongs to the technical field of refractory material production, and in particular relates to a wet sintering production method of alumina-based magnesium aluminum spinel. Background technique [0002] At present, the high-purity alumina-based spinel produced at home and abroad is divided into fused magnesia-alumina spinel and sintered magnesia-alumina spinel. The production process of sintered magnesia-alumina spinel is all produced by dry method, that is, alumina raw material It is mixed with dead-burned magnesia raw material in a certain proportion and then ground by grinding equipment, then shaped, dried and calcined. This production process not only has the disadvantages of high energy consumption, poor production environment, and high labor intensity due to the difficulty in grinding the particle size to a certain extent, but also has the disadvantages of high sintering temperature, low content of main crystal phase after sintering...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 黄克忠周红军张东方
Owner SANMENXIA XINYANGSHAO SYNTHETIC MATERIALS
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