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Zirconium oxide monodisperse active spinel powder and preparation method thereof

A technology for dispersing active, spinel powder, applied in the field of spinel refractory raw materials, can solve the problems of difficult uniform dispersion, cross-section accidents, etc., to achieve the effects of longevity, inhibition of excessive growth, and improvement of thermal shock resistance

Inactive Publication Date: 2015-06-24
LUOYANG KECHUANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zirconia is introduced in the form of mechanical mixing, and it is difficult to disperse evenly in actual production. Once local enrichment occurs, microcracks will penetrate each other, and in severe cases, catastrophic cross-section accidents will occur

Method used

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  • Zirconium oxide monodisperse active spinel powder and preparation method thereof
  • Zirconium oxide monodisperse active spinel powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Activated alumina micropowder and nano light magnesium carbonate are used as raw materials. The physical and chemical indicators of nano light magnesium carbonate are shown in Table 1.

[0022] Step 1, putting 51.6wt% activated alumina micropowder and 48.4wt% nano light magnesium carbonate into a ball mill for co-grinding for 30 hours to obtain a uniform co-grinding material;

[0023] Step 2, put the co-grinding material into the mixer, add 3wt% pregelatinized starch of the co-grinding material, and 13 wt% alkaline zirconium sol of the co-grinding material in turn, mix for 20 minutes, and then seal and trap the material for 22 hours;

[0024] Step 3, put the trapped material into the mold, and press molding;

[0025] Step 4: Naturally dry the green body at room temperature for 20 hours, dry at 150°C for 24 hours, then put it into a high-temperature kiln and calcinate at 1300°C for 6 hours;

[0026] In step five, the calcined material is crushed, coarsely ground, and f...

Embodiment 2

[0029] Activated alumina micropowder and nano light magnesium oxide are used as raw materials. The physical and chemical indicators of nano light magnesium oxide are shown in Table 2.

[0030] Step 1, putting 71.7wt% activated alumina micropowder and 28.3wt% nano light magnesium oxide into a ball mill for co-grinding for 40 hours to obtain a uniform co-grinding material;

[0031] Step 2, put the co-grinding material into the mixer, add 2 wt% acetate starch of the co-grinding material and 10 wt% alkaline zirconium sol of the co-grinding material in turn, mix for 18 minutes, and then seal and trap the material for 24 hours;

[0032] Step 3, put the trapped material into the mold, and press molding;

[0033] Step 4: Naturally dry the body at room temperature for 24 hours, and then dry it at 160°C for 24 hours; then place it in a high-temperature kiln and calcinate it at 1350°C for 8 hours;

[0034] In step five, the calcined material is crushed, coarsely ground, and finely grou...

Embodiment 3

[0037] Activated alumina micropowder, nano light magnesium carbonate and nano light magnesium oxide are used as raw materials.

[0038] Step 1, putting 64.2wt% activated alumina micropowder, 17.9wt% nanometer light magnesium carbonate and 17.9wt% nanometer light magnesium oxide into a ball mill for co-grinding for 40 hours to obtain a uniform co-grinding material;

[0039] Step 2, put the co-grind into the mixer, add the pregelatinized starch of co-grind 1wt%, the acetate starch of co-grind 1.5wt%, the basic zirconium sol of co-grind 12wt%, and mix for 22 minutes, then Airtight and trapped material for 24 hours;

[0040] Step 3, put the trapped material into the mold, and press molding;

[0041] Step 4: Naturally dry the green body at room temperature for 24 hours, then dry it at 150°C for 24 hours, then place it in a high-temperature kiln and calcinate it at 1320°C for 7 hours;

[0042] In step five, the calcined material is crushed, coarsely ground, and finely ground, and ...

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Abstract

The invention specifically relates to zirconium oxide monodisperse active spinel powder and a preparation method thereof. According to the technical scheme, the method comprises the following steps: firstly, co-grinding 50-75wt% of aluminum oxide rawbmaterial and 25-50wt% of magnesium oxide raw material; secondly, adding an organic binding agent and zirconium-containing liquid to a co-ground material, and mixing; thirdly, ageing the mixed material, and forming a green body in a mold pressing manner; fourthly, naturally drying the green body at a room temperature for 12-24 hours, drying at 150-180 DEG C for 20-24 hours and calcining at 1300-1350 DEG C for 6-8 hours; and finally, crushing calcined material, carrying out coarse grinding and fine grinding, carrying out air milling on superfine powder, so as to obtain the zirconium oxide monodisperse active spinel powder. the zirconium oxide monodisperse active spinel powder prepared by the method has relatively high low-temperature sintering activity and nano-zirconia monodisperse characteristic; the sintering temperature of corundum-spinel castable for a bottom-blow argon air brick can be effectively lowered; the compactness, the corrosion resistance and the thermal shock resistance of the corundum-spinel castable are improved; and the service life and the reliability of the bottom-blow argon air brick are enhanced.

Description

technical field [0001] The invention belongs to the technical field of spinel refractory raw materials, and in particular relates to zirconia homogeneously dispersed active spinel powder and a preparation method thereof. Background technique [0002] Al-Mg spinel has high temperature resistance, high melting point (2135°C), good volume stability, superior mechanical properties, and excellent slag erosion resistance. It is a high-quality refractory raw material and has been successfully used in bottom blowing argon in iron and steel smelting Breathable bricks, ladle linings, RH dipping pipes, CAS-OB covers, periclase spinel bricks for cement rotary kilns, etc. [0003] At present, most of the materials used for bottom-blown argon permeable bricks are corundum spinel chromium oxide castables. This castable has excellent corrosion resistance, but because chromium oxide will cause environmental pollution and endanger people's health, there is no oxidation. The trend of chromium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/443C04B35/622
Inventor 马军强
Owner LUOYANG KECHUANG NEW MATERIAL CO LTD
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