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Al2O3-Cr2O3 refractory aggregate and preparation method thereof

A technology of al2o3-cr2o3 and refractory aggregate, applied in the field of refractory materials, can solve problems such as excess performance, achieve high utilization rate, easy large-scale production, and tight combination

Active Publication Date: 2015-04-22
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for Al 2 o 3 -Cr 2 o 3 Refractory materials, aggregate particles have "overperformance" in resistance to slag erosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 50kg of Cr with particle size less than or equal to 10μm 2 o 3 Micropowder, 20kg of Al with particle size less than 10μm 2 o 3 Micropowder, 30kg Al with a particle size greater than 10μm and less than or equal to 74μm 2 o 3 Fine powder, mixed evenly by vibrating ball mill to prepare Cr 2 o 3 Powder with a content of 50%; weigh 300kg of Al with a particle size greater than 0.5mm and less than or equal to 4mm 2 o 3 Particles are put into a roller mixer, and 16kg of phenolic resin binder is added to make the surface of the particles evenly adhere to the binder; 100kg of evenly mixed Cr 2 o 3 The powder with a content of 50% is added to the mixer and stirred to make it evenly adhere to the surface of the particles to form a coating on the particles; dry the coated granular materials at 110°C for more than 24 hours, and then calcinate them in an electric kiln at 1500°C for 8 hours. After cooling, the agglomerates are crushed and sieved to obtain the product of...

Embodiment 2

[0028] Weigh 99kg of Cr with particle size less than or equal to 10μm 2 o 3 Micropowder and 1kg of TiO with particle size less than 43μm 2 powder, using a vibrating ball mill to mix evenly to prepare Cr 2 o 3 Powder with a content of 99%; weigh 300kg of homogeneous Al with a particle size greater than 0.5mm and less than or equal to 4mm 2 o 3 -Cr 2 o 3 Particles (Al 2 o 3 =66.5%, Cr 2 o 3 =33.5%), put it into a roller mixer, add 16kg of water-based resin binder to make the particle surface evenly adhere to the binder; mix 100kg of Cr evenly 2 o 3 The powder with a content of 99% is added to the mixer and stirred to make it evenly adhere to the particle surface to form a coating on the particle; the coated granular material is dried at 110°C for more than 24 hours, and is calcined in a gas kiln at 1700°C for 10 hours. After cooling, crush the agglomerates and sieve out particles larger than 1 mm and smaller than or equal to 5 mm to obtain the product of the present ...

Embodiment 3

[0030] Weigh 20kg of Cr with particle size less than or equal to 10μm 2 o 3 Micropowder, 40kg of Al with particle size less than 10μm 2 o 3 Micropowder, 40kg Al with a particle size greater than 10μm and less than or equal to 74μm 2 o 3 Fine powder, mixed evenly by vibrating ball mill to prepare Cr 2 o 3 Content is the powder of 20%; Weigh 300kg particle diameter and be greater than 0.5mm to be less than or equal to the bauxite particle of 3mm (Al 2 o 3 ≥80%), put it into a roller mixer, add 4.5kg of pulp waste liquid binder to make the particle surface evenly adhere to the binder; mix 50kg of Cr 2 o 3 The powder with a content of 20% is added to the mixer and stirred to make it evenly adhere to the surface of the particles to form a coating on the particles; then add 2kg of pulp waste liquid binder to make the coating evenly adhere to the binder, and then add 30kg to mix evenly Cr 2 o 3 The powder with a content of 20% is added to the mixer and stirred to make the ...

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Abstract

The invention belongs to the field of refractory materials and relates to an Al2O3-Cr2O3 refractory aggregate and its preparation method. The Al2O3-Cr2O3 refractory aggregate has nonuniform chemical composition. Content of Cr2O3 at peripheral position of the Al2O3-Cr2O3 refractory aggregate is greater than or equal to 20%, and content of Cr2O3 at the central position is lower than Content of Cr2O3 at the peripheral position. Porosity of the Al2O3-Cr2O3 refractory aggregate is not more than 10%. Al2O3 and Cr2O3 in the refractory aggregate form uniform solid solutions. Particles and a coating are combined tightly, and strength is high. A diffusion reaction of Al2O3 and Cr2O3 at high temperature causes Cr2O3 concentration attenuation from the surface layer to the center of the aggregate. An Al2O3-Cr2O3 refractory product prepared from the refractory aggregate has good slag corrosion resistance. Meanwhile, utilization rate of chromium resources is high.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to an Al 2 o 3 -Cr 2 o 3 Refractory aggregate and preparation method, the Al 2 o 3 -Cr 2 o 3 Refractory aggregate is a raw material for making chromium-containing refractories. Background technique [0002] Refractories are key materials in the high-temperature field, and the chemical erosion of refractories by high-temperature slag will directly affect the practicability of refractories. Al 2 o 3 -Cr 2 o 3 Quality refractories are based on Al 2 o 3 and Cr 2 o 3 The refractory material as the main component has good mechanical strength, high temperature performance and excellent acid slag corrosion resistance, and is widely used in many fields such as non-ferrous metal smelting, petrochemical, coal chemical, iron and steel smelting. [0003] in Al 2 o 3 -Cr 2 o 3 Among quality refractory materials, Cr 2 o 3 The corrosion resistance of the composition is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 孙红刚李鹏涛李红霞王刚闫双志耿可明杜一昊蔡斌利
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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