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Al2O3-Cr2O3 refractory material having microporous structure

A technology of al2o3-cr2o3 and refractory materials, applied in the field of refractory materials, can solve problems such as uneven pore size distribution, achieve excellent thermal shock resistance, small changes, and improve utilization efficiency

Active Publication Date: 2015-03-25
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the above findings, in order to overcome the existing Al 2 o 3 -Cr 2 o 3 Inhomogeneous pore size distribution defects caused by the mixing process of machine-pressed products, the invention provides a microporous structure Al 2 o 3 -Cr 2 o 3 refractory material

Method used

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  • Al2O3-Cr2O3 refractory material having microporous structure
  • Al2O3-Cr2O3 refractory material having microporous structure
  • Al2O3-Cr2O3 refractory material having microporous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh D separately 50 6μm chromium oxide green powder (Cr 2 o 3 ≥99%) 6kg, D 50 5μm alumina powder (Al 2 o 3 ≥99%) 4kg, sodium hexametaphosphate 120g, cellulose 160g, prepared into a slurry with a solid content of 65%, spray granulation. Weigh the fused chromium oxide (Cr 2 o 3 ≥99%) 2.2kg, sintered alumina (Al 2 o 3 ≥99%) 0.5kg, Al prepared in the previous step 2 o 3 -Cr 2 o 3 Granulation material 1kg, ZrO 2 0.3kg of fine powder is fully pre-mixed by a ball mill to prepare a matrix. Sintered corundum particles (Al 2o 3 ≥99%) 0.5kg, particle size 1mm~3mm fused Al 2 o 3 -Cr 2 o 3 Particles (Cr 2 o 3 ≈50%) 4kg, fused chromium oxide particles (Cr 2 o 3 ≥99%) 1.5kg into the roller sand mixer and mix evenly, add 0.3kg of PVA aqueous solution with a mass fraction of 5% to the granular material, add the premixed matrix fine powder after stirring, and mix well, the trapped material , friction brick press forming body, after drying at 60°C, put it into a ...

Embodiment 2

[0030] Weigh D separately 50 10μm chromium oxide green powder (Cr 2 o 3 ≥99%) 2kg, D 50 3μm alumina powder (Al 2 o 3 ≥99%) 8kg, ammonium hexametaphosphate 50g, dextrin 300g, prepared into a slurry with a solid content of 55%, spray granulation. Weigh the sintered chromium oxide (Cr 2 o 3 ≥99%) 1kg, sintered alumina (Al 2 o 3 ≥99%) 1.8kg, Al prepared in the previous step 2 o 3 -Cr 2 o 3 Granulation material 1kg, Y 2 o 3 0.2kg of fine powder is fully pre-mixed by a ball mill to prepare a matrix. Sintered corundum particles (Al 2 o 3 ≥99%) 3.5kg, particle size 1mm~3mm fused Al 2 o 3 -Cr 2 o 3 Particles (Cr 2 o 3 ≈70%) 1kg, sintered chromium oxide particles (Cr 2 o 3 ≥99%) 1.5kg into the roller sand mixer and mix evenly, add 0.3kg of PVA aqueous solution with a mass fraction of 5% to the granular material, add the premixed matrix fine powder after stirring, and mix well, the trapped material ; After the green body is formed by a friction brick press, it is...

Embodiment 3

[0032] Weigh D separately 50 8μm chromium oxide green powder (Cr 2 o 3 ≥99%) 4kg, D 50 4μm alumina powder (Al 2 o 3 ≥99%) 6kg, polyacrylamide 90g, cellulose 260g, prepared into a slurry with a solid content of 75%, spray granulation. Weigh the sintered chromium oxide (Cr 2 o 3 ≥99%) 1kg, fused alumina (Al 2 o 3 ≥99%) 1kg, Al prepared in the previous step 2 o 3 -Cr 2 o 3 1.5 kg of granulated material and 0.5 kg of MgO micropowder are fully premixed by a ball mill to prepare a matrix. Weigh the fused corundum particles (Al 2 o 3 ≥99%) 1kg, particle size 1mm~3mm fused Al 2 o 3 -Cr 2 o 3 Particles (Cr 2 o 3 ≈80%) 1kg, sintered chromium oxide particles (Cr 2 o 3 ≥99%) 4kg was added to the roller sand mixer and mixed evenly, and 0.3kg of calcium lignosulfonate solution with a mass concentration of 35% was added to the pellets, and after stirring, the premixed matrix fine powder was added. material; the body formed by a friction brick press, dried at 110°C, put...

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Abstract

The invention belongs to the field of refractory materials, and provides an Al2O3-Cr2O3 refractory material having a microporous structure. The refractory material is characterized in that Al2O3-Cr2O3 granulation materials are directly added to serve as raw materials for preparing a base instead of chrome oxide green micropowder and sintered aluminum oxide micropowder respectively added in the prior art; based on the characteristic that the chrome oxide green is uniform in content and dispersion in the granulation materials, the concentration of the chrome oxide green is avoided, so that pores formed by solid solution are uniform in size; and the Al2O3-Cr2O3 refractory material having a microporous structure is prepared by regulating the chrome oxide green content in the granulation materials to achieve the purpose of controlling the diameter of the pores. According to the invention, the Al2O3-Cr2O3 refractory material has more excellent thermal shock resistance and slag corrosion resistance under the condition of not changing the porosity of the material, thus obtaining longer service life in use. The method is simple, feasible and easy to implement; and from the perspectives of economy, environment and practicality, the prepared Al2O3-Cr2O3 refractory material has distinct competitive advantages.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a microporous structure Al 2 o 3 -Cr 2 o 3 refractory material. Prepared Al 2 o 3 -Cr 2 o 3 Refractory materials are suitable for lining materials of high-temperature furnaces in chemical and smelting industries. 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. Among all oxide and non-oxide refractories, chromium trioxide (Cr 2 o 3 ) has excellent resistance to slag erosion, and is an essential refractory raw material for corrosion-resistant materials. It is widely used in non-ferrous metal smelting, petrochemical, coal chemical, glass smelting and many other fields. [0003] Alumina (Al 2 o 3 ) and chromium oxide are very easy to form continuous solid solution Al at high temperature 2 o 3 -Cr ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B38/02
Inventor 李鹏涛孙红刚闫双志李坚强王晗王刚耿可明吴爱军
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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