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Cr2O3-Al2O3 refractory material of anisotropic structure

A refractory material, heterogeneous technology, applied in the field of refractory materials, can solve the problems of mismatching erosion rate between aggregate and matrix, little erosion resistance effect, waste of high-quality aggregate, etc., to achieve excellent slag erosion resistance, Improvement of slag erosion resistance and reduction of environmental hazards

Active Publication Date: 2013-07-03
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, high-quality aggregates have little effect on improving the overall erosion resistance of the material, and the mismatch between the erosion rates of aggregates and matrix also causes waste of high-quality aggregates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh the fused Cr with a particle size of 0.043 mm ~ 0.15 mm, respectively. 2 o 3 -Al 2 o 3 Fine powder (Cr 2 o 3 ≈95%) 1.5 kg of chromium oxide green fine powder (Cr 2 o 3 ≥99%) 0.8 kg, fine alumina powder (Al 2 o 3 ≥99%) 0.4 kg, ZrO 2 0.3 kg of fine powder was fully pre-mixed by a ball mill to prepare matrix fine powder; weigh the fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈50%) 3 kg, the particle size is greater than 1 mm and less than or equal to 3 mm fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈60%) 2 kg, the particle size is greater than 0.15 mm and less than or equal to 1 mm fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈70%) 2 kg was added to the roller sand mixer and mixed evenly; 0.3 kg of refractory binder (PVA aqueous solution with a mass fraction of 5%) was added to the pellets, and the pre-mixed matrix fine powder was added after stirring. After fully mixing, the material is trapped; the body is formed by a friction brick press...

Embodiment 2

[0024] Weigh the fused Cr with a particle size of 0.043 mm ~ 0.15 mm, respectively. 2 o 3 -Al 2 o 3 Fine powder (Cr 2 o 3 ≈95%) 1.5 kg of chromium oxide green fine powder (Cr 2 o 3 ≥99%) 0.8 kg, fine alumina powder (Al 2 o 3 ≥99%) 0.4 kg, ZrO 2 0.3 kg of fine powder was fully pre-mixed by a ball mill to prepare matrix fine powder; weigh the fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈50%) 3 kg, the particle size is greater than 1 mm and less than or equal to 3 mm fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈60%) 2 kg, the particle size is greater than 0.15 mm and less than or equal to 1 mm fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈70%) 2 kg into the V-shaped mixer and mixed evenly to obtain Cr with heterogeneous structure 2 o 3 -Al 2 o 3 Unshaped bulk material.

Embodiment 3

[0026] Weigh the sintered Cr with a particle size of 0.043 mm ~ 0.15 mm 2 o 3 -Al 2 o 3 Fine powder (Cr 2 o 3 ≈95%) 1.8 kg of chromium oxide green fine powder (Cr 2 o 3 ≥99%) 1.5 kg of alumina fine powder (Al 2 o 3 ≥99%) 0.4 kg, ZrSiO 4 0.3 kg of fine powder was fully pre-mixed by a ball mill to prepare a matrix fine powder; weigh the fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈30%) 2.5 kg, the particle size is greater than 1 mm and less than or equal to 3 mm electrofused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈40%) 1 kg, particle size greater than 1 mm and less than or equal to 3 mm sintered Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈40%) 0.5 kg, particle size greater than 0.15 mm and less than or equal to 1 mm fused Cr 2 o 3 -Al 2 o 3 Particles (Cr 2 o 3 ≈50%) 2 kg into the roller sand mixer and mix evenly; add 0.3 kg of PVA aqueous solution with a mass fraction of 5% to the granular material, add the pre-mixed matrix fine powder after stirring,...

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Abstract

The invention belongs to the field of the refractory material. The aggregate of the Cr2O3-Al2O3 refractory material of an anisotropic structure is composed of coarse particles, medium particles and fine particles, wherein the Cr2O3 content in the coarse particles is 30-50%, the Cr2O3 content in the medium particles is 40-60%, and the Cr2O3 content in the fine particle is 50-70%; a matrix is composed of Cr2O3-Al2O3 fine powder, chromium oxide green fine powder and alumina micro-powder, wherein the Cr2O3 content in the Cr2O3-Al2O3 fine powder is 80-95%, and the granularity of the Cr2O3-Al2O3 fine powder is 0.043-0.15mm; the Cr2O3 content in the chromium oxide green fine powder is more than or equal to 99%, and the granularity of the chromium oxide green fine powder is 0.03-0.15mm; and the Al2O3 content in the alumina micro-powder is more than or equal to 99%, and the granularity D50 of the alumina micro-powder is 1-10mu mm. According to the Cr2O3-Al2O3 refractory material of an anisotropic structure, the utilization ratio of the Cr2O3 resource can be effectively improved, the cost of the refractory material is lowered, and harm on the environment by a chromium-contained material is lightened.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a Cr with heterogeneous structure 2 o 3 -Al 2 o 3 refractory material. 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. However, Cr 2 o 3 The raw material itself is scarce and expensive, and there is a potential hazard of "hexavalent chromium" in use. High Cr 2 o 3 The content of refractory materials is restricted. How to design and manufacture Cr 2 o 3 The content is low, but the anti-sla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 孙红刚李鹏涛闫双志耿可明王晗李坚强王刚吴爱军
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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