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A kind of aluminum oxide material and preparation method thereof

A technology of alumina and alumina fine powder, applied in the field of refractory materials, can solve problems such as alumina carbothermic reduction reaction, and achieve the effects of high thermal shock stability, stable high temperature performance and high high temperature strength

Inactive Publication Date: 2018-03-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above research results show that the coexistence of alumina and carbon with molten iron (steel) or other metal solutions will lead to the occurrence of carbon thermal reduction reaction of alumina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An alumina material and a preparation method thereof. The mass ratio of alumina fine powder and mixed solution is 1:2, put in a mixer and mix for 0.5-3 hours to obtain a mixed slurry; then filter the mixed slurry and dry it at 110°C for 24 hours. Obtain a mixture block; heat the mixture block at 1000-1100° C. for 1-3 hours, cool, and ball mill to 1-100 μm to obtain an alumina material.

[0025] The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein the content of beryllium hydroxide is 5-10wt%, and the oxalic acid solution is 90-95wt%.

[0026] The alumina material prepared in this embodiment is tested: Al 2 o 3 Content ≥ 91wt%; apparent porosity ≤ 5%.

Embodiment 2

[0028] An alumina material and a preparation method thereof. According to the mass ratio of alumina fine powder and mixed solution as 1:2, mix in a mixer for 3 to 6 hours to obtain a mixed slurry; then filter the mixed slurry and dry it at 110°C for 24 hours. Obtain a mixture block; heat the mixture block at 1100-1200° C. for 3-5 hours, cool, and ball mill to 100-150 μm to obtain an alumina material.

[0029] The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein: the beryllium hydroxide is 10-20 wt%, and the oxalic acid solution is 80-90 wt%.

[0030] The alumina material prepared in this embodiment is tested: Al 2 o 3 Content≥95wt%; apparent porosity≤4%.

Embodiment 3

[0032] An alumina material and a preparation method thereof. According to the mass ratio of alumina fine powder and mixed solution as 1:2, mix in a mixer for 6-8 hours to obtain a mixed slurry; then filter the mixed slurry and dry it at 110°C for 24 hours. Obtain a mixture block; heat the mixture block at 1200-1300° C. for 5-6 hours, cool, and ball mill to 150-200 μm to obtain an alumina material.

[0033] The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein: the beryllium hydroxide is 20-30 wt%, and the oxalic acid solution is 70-80 wt%.

[0034] The alumina material prepared in this embodiment is tested: Al 2 o 3 Content≥98wt%; apparent porosity≤2%.

[0035] Compared with the prior art, this specific embodiment has the following positive effects:

[0036] When this specific embodiment is prepared at high temperature, the Be(OH) wrapped on the surface of the alumina particles during the blending process 2 Will decompose to form ...

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Abstract

The invention relates to an alumina material and a preparation method thereof. According to a technical scheme in the invention, the preparation method comprises the following steps: carrying out batching according to a mass ratio of fine alumina powder to a mixed solution of 1: 2 and placing the fine alumina powder and the mixed solution in a mixer for blending for 0.5 to 8 h so as to obtain mixed slurry; draining the mixed slurry through filtering and then carrying out drying at 110 DEG C for 24 h so as to obtain a mixture block; and maintaining the mixture block at 1000 to 1300 DEG C for 1 to 6 h, then cooling the mixture block and carrying out ball milling until a particle size of 1 to 200 [mu]m is obtained so as to obtain the alumina material. The mixed solution is composed of 5 to 30% of beryllium hydroxide and 70 to 95% of an oxalic acid solution. The alumina material prepared in the invention has the characteristics of stable high temperature performance, great high-temperature strength, a small thermal expansion coefficient and high thermal shock stability, and is a novel raw material for preparation of a refractory material used in high-temperature industry.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to an alumina material and a preparation method thereof. Background technique [0002] Take Al 2 o 3 Carbon-containing products represented by -C refractories are widely used as ladle and flow-controlling refractory materials in the continuous casting process, and have become the most widely used refractory materials in continuous casting. They are widely used as ladle and tundish sliding nozzle series products and Three major parts of continuous casting (long nozzle, submerged nozzle and stopper rod), etc. The three major parts of continuous casting are in a very important position in steelmaking production, and their quality is of great significance to the continuity and stability of continuous casting production. At present, 80% of the steel billets in the world are produced by continuous casting technology. Among them, the ladle slide, long nozzle, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/101C04B35/628
CPCC04B35/101C04B35/6281C04B2235/3205C04B2235/5427C04B2235/5436
Inventor 魏耀武邵勇李楠
Owner WUHAN UNIV OF SCI & TECH
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