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Aluminum oxide-chromic oxide refractory product and preparation method thereof

A technology of refractory products and chromium oxide, applied in the field of refractory materials, can solve the problems of carcinogenic danger, strong toxicity, skin threat to the digestive system, etc., and achieve the effects of eliminating toxicity, improving low cost performance, and rational and effective utilization

Inactive Publication Date: 2018-06-01
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As a hazardous waste, chromium salt slag is extremely toxic, and the Cr contained in it 6+ It can be dissolved in water or certain acids, and it is easy to enter the human body through swallowing and inhalation. It poses a great threat to the human digestive system, respiratory tract, skin, etc. Long-term exposure or inhalation may cause cancer.

Method used

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  • Aluminum oxide-chromic oxide refractory product and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical composition of the particle size range of 44μm-74μm was weighed as w (Al 2 o 3 ) ≥ 99.0% fused white corundum fine powder 10kg, the chemical composition of the particle size range 44μm-74μm is w (Cr 2 o 3 )≥99.0% fused chromium oxide fine powder 10kg, particle size D 50 =3μm, w (Al 2 o 3 )≥99.0% sintered α-Al 2 o 3 Micro powder 10kg, particle size D50=5μm, w (Cr 2 o 3 ) ≥ 99.2% of chromium oxide green 5kg, 5kg of chromium salt slag in the particle size range of 44μm-74μm, fully mixed in a ball mill for 1.5h, and prepared into a matrix; the chemical composition of the particle size range of 0.1-4mm was weighed respectively w (Al 2 o 3 ) ≥ 99.0% white corundum particles 40kg, including 10kg of particles with a particle size range of 0.1-1mm, 20kg of particles with a particle size range of 1-3mm, and 10kg of particles with a particle size range of 3-4mm. The chemical composition of the particle size range of 0.1-4mm is weighed as w (Cr 2 o 3 )...

Embodiment 2

[0025] The chemical composition of the particle size range of 44μm-74μm was weighed as w (Al 2 o 3 ) ≥ 99.0% fused white corundum fine powder 10kg, the chemical composition of the particle size range 44μm-74μm is w (Cr 2 o 3 )≥99.0% fused chromium oxide fine powder 10kg, particle size D 50 =3μm, w (Al 2 o 3 )≥99.0% sintered α-Al 2 o 3 Micro powder 6kg, particle size D50=5μm, w (Cr 2 o 3 ) ≥ 99.2% of chromium oxide green 4kg, 5kg of chromium salt slag in the particle size range of 44μm-74μm, fully mixed in a ball mill for 1.5h, and prepared into a matrix; the chemical composition of the particle size range of 0.1-4mm was weighed respectively w (Al 2 o 3 ) ≥ 99.0% of white corundum particles 50kg, including 10kg of particles with a particle size range of 0.1-1mm, 25kg of particles with a particle size range of 1-3mm, and 15kg of particles with a particle size range of 3-4mm. The chemical composition of the particle size range of 0.1-4mm is weighed as w (Cr 2 o 3...

Embodiment 3

[0027] The chemical composition of the particle size range of 44μm-74μm was weighed as w (Al 2 o 3 ) ≥ 99.0% fused white corundum fine powder 10kg, the chemical composition of the particle size range 44μm-74μm is w (Cr 2 o 3 ) ≥ 99.0% fused chromium oxide fine powder 6kg, particle size D 50 =4μm, w (Al 2 o 3 )≥99.0% sintered α-Al 2 o 3 Micro powder 10kg, particle size D50=7μm, w (Cr 2 o 3 ) ≥ 99.2% of chromium oxide green 6kg, 3kg of chromium salt slag in the particle size range of 44μm-74μm, fully mixed in a ball mill for 2h, and prepared into a matrix; the chemical composition of the particle size range of 0.1-4mm was weighed respectively w (Al 2 o 3 ) ≥ 99.0% white corundum particles 40kg, including 10kg of particles with a particle size range of 0.1-1mm, 20kg of particles with a particle size range of 1-3mm, and 10kg of particles with a particle size range of 3-4mm. The chemical composition of the particle size range of 0.1-4mm is weighed as w (Cr 2 o 3 ) ...

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Abstract

The invention belongs to the field of refractory materials, and mainly relates to an aluminum oxide-chromic oxide refractory product and a preparation method thereof. The raw materials of aluminum oxide-chromic oxide refractory product comprise aggregate and a matrix; the aggregate comprises white fused alumina particles, brown fused alumina particles and chromic oxide particles; the matrix comprises one or a mixture of more in chromic oxide fine powder, chromic oxide micro powder, aluminum oxide fine powder or aluminum oxide micro powder; metallic Al and metallic Cr alumina-chrome slag particles are further contained in the aggregate; chromic salt slag fine powder and micro powder are further added in the matrix. The refractory product reasonably and effectively utilizes hazardous wastes,and improves the problem that the traditional pink fused alumina brick is low in cost performance in industrial production with low service temperature requirement.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to an alumina-chromium oxide refractory product and a preparation method thereof. Background technique [0002] al 2 o 3 -Cr 2 o 3 Refractory material (commonly known as chrome corundum brick, hereinafter collectively referred to as chrome corundum brick) is a high-performance refractory material produced with alumina and chromium oxide as the main raw materials. It has high refractoriness, high physical strength, good thermal shock stability, The characteristics of strong corrosion resistance, strong resistance to erosion, erosion, wear and peeling in industrial use. It is widely used in nonferrous metallurgy, glass, petrochemical, carbon black, and waste incineration industries. [0003] Chromium corundum bricks have excellent slag resistance, the reason is: Al in alumina and chromium oxide 3+ and Cr 3+ It has an approximate ionic radius and valence state, and meets...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/047C04B35/622
CPCC04B35/047C04B35/62204C04B2235/3206C04B2235/3208C04B2235/3418C04B2235/402C04B2235/404C04B2235/77
Inventor 杜一昊孙红刚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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