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Silicon carbide-magnesium aluminum spinel composite refractory material

A technology of magnesium aluminum spinel and refractory materials, which is applied in the field of refractory materials, can solve the problems of low operating temperature and poor slag resistance, and achieve high refractory performance, improved slag resistance, and good mechanical strength.

Active Publication Date: 2018-04-06
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional clay-bonded silicon carbide has low service temperature and poor slag resistance, which cannot meet the requirements

Method used

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  • Silicon carbide-magnesium aluminum spinel composite refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical composition of the particle size greater than 10 μm and less than or equal to 90 μm was weighed as w (Al 2 o 3 +MgO)≥99.5%, Al 2 o 3 35 kg of ≈72% sintered magnesia-aluminum spinel fine powder, the chemical composition of which is greater than 43 μm and less than or equal to 74 μm is w (Al 2 o 3 ) ≥ 99.0% fused white corundum fine powder 3 kg, light-burned magnesia fine powder 1 kg, elemental Si fine powder 1 kg with a particle size greater than 5 μm and less than or equal to 15 μm, fully premixed by a ball mill to prepare matrix fine powder; w (SiC) ≥ 98.0% fused silicon carbide particles, of which 15 kg of particles with a particle size greater than 0.1 mm and less than or equal to 1 mm, 30 kg of particles with a particle size greater than 1 mm and less than or equal to 3 mm, 15 kg of particles with a particle size greater than 3 mm and less than or equal to 5 mm Add it to the wheel-type sand mixer and mix it evenly; add about 3 kg of binder phenoli...

Embodiment 2

[0023] The chemical composition of the particle size greater than 10 μm and less than or equal to 90 μm was weighed as w (Al 2 o 3 +MgO)≥99.5%, Al 2 o 3 ≈65% sintered magnesia-aluminum spinel fine powder 27 kg, the chemical composition of particle size greater than 43 μm and less than or equal to 74 μm is w (Al 2 o 3 ) ≥ 99.0% tabular corundum fine powder 5 kg, fused magnesia fine powder 1.5 kg, metal aluminum powder 1.5 kg with a particle size greater than 20 μm and less than or equal to 50 μm, fully premixed by a ball mill to prepare matrix fine powder; w (SiC) ≥ 98.0% fused silicon carbide particles, of which 15 kg of particles with a particle size greater than 0.1 mm and less than or equal to 1 mm, 30 kg of particles with a particle size greater than 1 mm and less than or equal to 3 mm, 25 kg of particles with a particle size greater than 3 mm and less than or equal to 4 mm Add it to the wheel-type sand mixer and mix it evenly; add about 4 kg of binder water-soluble ...

Embodiment 3

[0025] The chemical composition of the particle size greater than 10 μm and less than or equal to 74 μm was weighed as w (Al 2 o 3 +MgO)≥99.0%, Al 2 o 3 The chemical composition of ≈85% fused magnesia-aluminum spinel fine powder 15 kg, particle size greater than 43 μm and less than or equal to 74 μm is w (Al 2 o 3 )≥99.0% fused white corundum fine powder 6 kg, particle size D 50 =5 μm, w (Al 2 o 3 )≥99.0% of α-Al 2 o 3 5 kg of fine powder, 2 kg of sintered magnesia fine powder, 1 kg of spherical graphite powder with a particle size greater than 30 μm and less than or equal to 50 μm, fully pre-mixed by a ball mill to prepare matrix fine powder; weigh w (SiC) ≥ 98.5% fused silicon carbide particles, of which 15 kg of particles with a particle size greater than 0.1 mm and less than or equal to 0.5 mm, 20 kg of particles with a particle size greater than 0.5 mm and less than or equal to 1.43 mm, 35 kg of particles with a particle size greater than 1.43 mm and less than...

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Abstract

The invention belongs to the field of refractory materials and proposes a silicon carbide-magnesium aluminum spinel composite refractory material. Raw materials of the silicon carbide-magnesium aluminum spinel composite refractory material comprise aggregates and matrices; silicon carbide particles serve as the aggregates, fine powder or micro powder of magnesium aluminum spinel, aluminium oxide and magnesium oxide serves as the matrices, and antioxidants are also added in the matrices; the aggregates, the matrices and binders are mixed evenly and shaped, dried and burnt under the protection of a buried carbon or nitrogen atmosphere, and the composite refractory material with SiC as a main crystalline phase and magnesium aluminum spinel as a secondary crystalline phase is obtained, whereinthe mass fraction of SiC is 58.5-83.5%, the mass fraction of Al2O3 is 10-28.5%, the mass fraction of MgO is 2.5-11%, and the apparent porosity is 15-19%. The product does not contain chromium oxide and has the advantages of being low in cost, environmentally friendly, high in strength, good in thermal shock resistance, excellent in molten slag corrosion resistance and molten slag penetration resistance and the like.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a silicon carbide-magnesium aluminum spinel composite refractory material. Background technique [0002] In the use of refractory materials, some emphasize thermal insulation at high temperatures, some require high-temperature structural strength, and there is a large category of reactors that are mainly used for high-temperature melts. This type of material requires high temperature resistance and excellent slag resistance. Performance is the main goal pursued. For example, the coal-water slurry gasification device in the field of coal gasification, which makes coal and water into a slurry and then pumps it into a gasifier to prepare CO and H under high temperature and high pressure. 2 Advanced equipment for coal gasification such as chemical gases used to synthesize chemical products. The inner cavity of the device is made of refractory materials. 2 Atmospheric enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/565
CPCC04B35/565C04B35/66C04B2235/3206C04B2235/3217C04B2235/3222C04B2235/3821C04B2235/386C04B2235/3865C04B2235/402C04B2235/422C04B2235/428C04B2235/5427C04B2235/5436C04B2235/5445C04B2235/602C04B2235/606C04B2235/656C04B2235/658C04B2235/77C04B2235/96C04B2235/9676
Inventor 孙红刚李红霞赵世贤王刚蔡斌利杜一昊王岚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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