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
View PDF7 Cites 5 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap