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Al2O3-Cr2O3 refractory product and preparation method thereof

A technology of al2o3-cr2o3 and refractory products, which is applied in the field of Al2O3-Cr2O3 refractory products and its preparation, and can solve the problems of reduced performance of refractory materials, inability to shape bricks, and low density.

Active Publication Date: 2014-04-09
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical engineering applications, phosphate to Al 2 o 3 -Cr 2 o 3 It is very difficult to add a large amount of refractory materials, which will reduce the performance of the material and lead to Al 2 o 3 -Cr 2 o 3 Decreased performance of refractory materials
Phosphoric acid or phosphate binders are mostly liquid, and excessive addition will cause bricks to fail to form; adding phosphorus pentoxide and solid phosphates as raw materials will result in bulky materials and extremely low density

Method used

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  • Al2O3-Cr2O3 refractory product and preparation method thereof
  • Al2O3-Cr2O3 refractory product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh Cr with a grain size greater than 0.043 mm and less than or equal to 0.15 mm 2 O 3 -Al 2 O 3 Fine powder (Cr 2 O 3 ≈99%) 15 kg, 320 mesh chromium oxide green fine powder (Cr 2 O 3 ≥99.5%) 10 kg, alumina powder 10 kg, red phosphorus with a particle size greater than 0.01mm and less than or equal to 0.05mm (P≈99.0%) 0.35 kg are fully premixed by a ball mill to prepare a matrix fine powder; weigh the particle size to be greater than 0.15 mm less than or equal to 5 mm fused Cr 2 O 3 -Al 2 O 3 Particles (Cr 2 O 3 ≈99%) 65 kg, add it to the roller-type sand mixer and mix well; add about 3 kg of PVA aqueous solution with a mass fraction of 5% to the pellets, add the pre-mixed matrix fine powder after stirring, and mix well, The material is trapped; the body of the friction brick press is dried at 110 ℃, and then loaded into the normal pressure shuttle gas kiln at 1800 ℃ for sintering. The sintering process is from 200 ℃ to 1000 ℃ and the heating rate is 5 ℃ / s. Cr 2 O 3 -Al...

Embodiment 2

[0028] Weigh Cr with a grain size greater than 0.043 mm and less than or equal to 0.15 mm 2 O 3 -Al 2 O 3 Fine powder (Cr 2 O 3 ≈99%) 15 kg, 320 mesh chromium oxide green fine powder (Cr 2 O 3 ≥99.5%) 10 kg, alumina powder 7 kg, monoclinic zirconia powder 6 kg, red phosphorus with a particle size greater than 0.01 mm and less than or equal to 0.1 mm (P≈99.5%) 2.2 kg, fully premixed by a ball mill, and prepared into a matrix fine powder ; Weigh fused Cr with a grain size greater than 0.15 mm and less than or equal to 5 mm 2 O 3 -Al 2 O 3 Particles (Cr 2 O 3 ≈99%) 60kg, add it to the roller-type sand mixer and mix well; add about 3.5 kg of PVA aqueous solution with a mass fraction of 5% to the pellets, add the pre-mixed matrix fine powder after stirring, and mix well. Material; the body formed by friction brick press, after drying at 110 ℃, it is put into normal pressure shuttle gas kiln for firing at 1700 ℃, the firing process is from 200 ℃ to 1000 ℃, the heating rate is 15 ℃ / s, t...

Embodiment 3

[0030] Weigh Cr with a grain size greater than 0.043 mm and less than or equal to 0.15 mm 2 O 3 -Al 2 O 3 Fine powder (Cr 2 O 3 ≈99%) 15 kg, 320 mesh chromium oxide green fine powder (Cr 2 O 3 ≥99.5%) 10.7 kg, alumina powder 3.5 kg, red phosphorus with a particle size greater than 0.01mm and less than or equal to 0.15mm (P≈99.9%) 0.88 kg is fully premixed by a ball mill to prepare a matrix fine powder; weigh the particle size to be greater than 0.15 mm less than or equal to 5 mm fused Cr 2 O 3 -Al 2 O 3 Particles (Cr 2 O 3 ≈99%) 70kg, add it to the roller-type sand mixer and mix well; add about 3.5 kg of PVA aqueous solution with a mass fraction of 5% to the pellets, add the pre-mixed matrix fine powder after stirring, and mix well. Material; the body formed by friction brick press, after drying at 110 ℃, it is put into atmospheric shuttle gas kiln for sintering at 1500 ℃, the sintering process is from 200 ℃ to 1000 ℃, the heating rate is 15 ℃ / s, then Cr is obtained 2 O 3 -Al 2 O...

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Abstract

The invention belongs to the field of refractory materials, and mainly relates to a Al2O3-Cr2O3 refractory product and a preparation method thereof. The total mass percent of Al2O3 and Cr2O3 in the product is at least 90%, wherein the mass percent of Cr2O3 in the product is 5-95%. The product is prepared by mixing Al2O3-containing and Cr2O3-containing refractory raw particles and fine powders with a binder into a billet and firing the billet at high temperature. The invention is characterized in that the Al2O3-Cr2O3 refractory product contains P2O5 which accounts for 0.8-5 wt% of the product. In the Al2O3-Cr2O3 refractory product, the P element is added in the form of a raw material in the billet manufacturing process; and the P element is simple substance phosphorus. The simple substance phosphorus is powdery red phosphorus of which the purity is not lower than 99.0%. The Al2O3-Cr2O3 refractory product is fired under normal pressure in an oxidizing atmosphere.

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 products and preparation methods. Background technique [0002] Refractories are key materials in the high-temperature field. The chemical attack of high-temperature slag on refractory materials will directly affect the practicality of refractory materials. Among the currently known oxide refractories, chromium trioxide (Cr 2 O 3 ) It has excellent resistance to slag corrosion and is an essential refractory material for corrosion resistant materials. Al 2 O 3 And Cr 2 O 3 With similar lattice constants, it is easy to form continuous solid solution Al at high temperature 2 O 3 -Cr 2 O 3 , In Al 2 O 3 Add a small amount of Cr to the material 2 O 3 It will significantly improve the slag resistance of the material, and the introduction of the second phase also promotes the sintering of the material. Therefore, the Al prepared by mixing alumina...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 孙红刚闫双志李丹耿可明李鹏涛王晗石鹏坤王刚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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