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A preparation method of in-situ composite phase combined magnesium aluminum spinel-silicon carbide refractory material

A technology of magnesia-alumina spinel and magnesia-alumina spinel powder, which is applied in the field of refractory materials, can solve the problems of high chromium refractory materials such as environmental pollution and failure to show good resistance to coal slag erosion, so as to improve mechanical properties and promote sintering , to reduce the effect of oxidation

Active Publication Date: 2021-09-21
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the lining material for coal-water slurry gasifier is a high-chromium refractory material with excellent corrosion resistance; however, due to the 2 o 3 with CaO, Na 2 O and K 2 O reacts to form Cr which is easily soluble in water 6+ , high chromium refractory materials have the possibility of environmental pollution during use; therefore, the research on chromium-free refractory materials for coal-water slurry gasifier is of great significance; at present, there are few researches on chromium-free refractory materials at home and abroad Focus on spinel-based, alumina-based, magnesia-based and silicon carbide-based refractories, including Al 2 o 3 -CaO, Al 2 o 3 -SiC-C, MgO-MA, non-oxide bonded SiC and other systems, but these materials do not show good resistance to coal slag erosion in the special environment of coal gasification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Using magnesium aluminum spinel particles and SiC particles as aggregates, silicon carbide powder, magnesium aluminum spinel powder, MgO powder, α-Al 2 o 3 Si powder and simple Si powder are used as the matrix, and the composition and addition amount of the aggregate and the matrix are: magnesia-alumina spinel particles and SiC particles 65%, SiC powder 20%, magnesia-alumina spinel powder 10%, MgO and α -Al 2 o 3 Powder 0, elemental Si powder 5%. The magnesium aluminum spinel powder, silicon carbide powder, MgO powder, α-Al 2 o 3 Powder and Si powder were pre-mixed for 30 minutes, and the magnesia-aluminum spinel particles, SiC particles and binder were mixed and milled for 15 minutes. After 24 hours, the raw body is pressed into a green body by 110MPa on a hydraulic press; the green body is pressed by 110 o C dried for 4h, and finally passed through 1500 under nitrogen atmosphere o C for 5h and fired to obtain MgAl 2 o 4 - SiC refractories. The por...

Embodiment 2

[0022] Example 2: Using magnesium aluminum spinel particles and SiC particles as aggregates, silicon carbide powder, magnesium aluminum spinel powder, MgO powder, α-Al 2 o 3 Powder and elemental Si powder are used as the matrix, and the composition and addition amount of the aggregate and the matrix are: magnesia-alumina spinel particles and SiC particles 65%, SiC powder 20%, magnesia-alumina spinel powder 7%, MgO and α -Al 2 o 3 Powder 2%, elemental Si powder 6%. The magnesium aluminum spinel powder, silicon carbide powder, MgO powder, α-Al 2 o 3 Powder and Si powder were pre-mixed for 40 minutes, and the magnesia-aluminum spinel particles, SiC particles and binder were mixed and milled for 20 minutes. After 12 hours, the raw body is pressed into a green body by 120MPa on a hydraulic press; the green body is pressed by 110 o C dried for 6h, and finally passed through 1600 under nitrogen atmosphere o C for 5h and fired to obtain MgAl 2 o 4 - SiC refractories. The por...

Embodiment 3

[0023] Example 3: Using magnesium aluminum spinel particles and SiC particles as aggregates, silicon carbide powder, magnesium aluminum spinel powder, MgO powder, α-Al 2 o 3 Powder and elemental Si powder are used as the matrix. The composition and addition amount of the aggregate and matrix are: magnesia alumina spinel particles and SiC particles 65%, SiC powder 20%, magnesia alumina spinel powder 3%, MgO and α -Al 2 o 3 Powder 4%, elemental Si powder 8%. The magnesium aluminum spinel powder, silicon carbide powder, MgO powder, α-Al 2 o 3 Powder and Si powder were pre-mixed for 45 minutes, and the magnesia-aluminum spinel particles, SiC particles and binder were mixed and milled for 30 minutes. After 24 hours, the raw body is pressed into a green body by 140MPa on a hydraulic press; the green body is pressed by 110 o C dried for 6h, and finally passed through 1650 under nitrogen atmosphere o C for 5h and fired to obtain MgAl 2 o 4 - SiC refractories. The porosity of...

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Abstract

The invention belongs to the technical field of refractory materials, and discloses a preparation method of an in-situ composite phase combined magnesium-aluminum spinel-silicon carbide refractory material. Magnesium aluminum spinel particles and SiC particles are used as aggregates, silicon carbide powder, magnesium aluminum spinel powder, MgO powder, α‑Al 2 o 3 powder and simple Si powder as the matrix, the magnesium aluminum spinel powder, silicon carbide powder, MgO powder, α‑Al 2 o 3 Powder and Si powder are pre-mixed for 30-50 minutes, and the magnesia-aluminum spinel particles, SiC particles and binder are mixed and milled for 10-30 minutes. ~30min, the mixture is trapped, pressed into a green body and dried, and finally fired in a nitrogen atmosphere to obtain MgAl 2 o 4 ‑SiC refractories. The present invention significantly improves the MgAl 2 o 4 ‑The mechanical properties of SiC refractories reduce the erosion rate of cinders.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a preparation method of an in-situ composite phase combined magnesium aluminum spinel-silicon carbide refractory material. Background technique [0002] At present, the lining material for coal-water slurry gasifier is a high-chromium refractory material with excellent corrosion resistance; however, due to the 2 o 3 with CaO, Na 2 O and K 2 O reacts to form Cr which is easily soluble in water 6+ , high chromium refractory materials have the possibility of environmental pollution during use; therefore, the research on chromium-free refractory materials for coal-water slurry gasifier is of great significance; at present, there are few researches on chromium-free refractory materials at home and abroad Focus on spinel-based, alumina-based, magnesia-based and silicon carbide-based refractories, including Al 2 o 3 -CaO, Al 2 o 3 -SiC-C, MgO-MA, non-oxide combined with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/443C04B35/567
CPCC04B35/443C04B35/565C04B35/66C04B2235/3206C04B2235/3217C04B2235/428C04B2235/96
Inventor 亢一娜赵世贤孙红刚李红霞杜一昊尚心莲王刚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES