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Magnesium oxide refractory material and preparation method thereof

A refractory material and magnesium oxide technology, applied in the field of refractory materials, can solve the problems of thermal shock resistance, poor corrosion resistance and slagging resistance in alkaline atmosphere, etc., and achieve excellent corrosion resistance, good thermal shock resistance, and anti-corrosion Protruding effect of slagging effect

Active Publication Date: 2017-02-15
迁安市明杰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor thermal shock resistance, alkaline atmosphere corrosion resistance and anti-slagging ability of refractory materials such as mullite and other high-alumina minerals, the purpose of the present invention is to provide a Magnesium oxide refractory material with good thermal shock resistance, excellent corrosion resistance and outstanding anti-slagging effect

Method used

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preparation example Construction

[0023] The preparation process of the binder used in the present invention is as follows: take clay and silicon micropowder respectively according to the corresponding mass ratio, put them into ethylene glycol twice the total mass of clay and silicon micropowder, and stir for 15 minutes at 70°C to make the clay and silicon micropowder The fine powder is uniformly dispersed in ethylene glycol.

[0024] The composition and corresponding mass ratio of the plasticizer used in the present invention are: based on the mass of the plasticizer as 100%, 50%-70% of bentonite, and 30-50% of hydroxypropyl methylcellulose.

[0025] The preparation process of the plasticizer used in the present invention is as follows: grind bentonite until it can be sieved through a screen with more than 200 meshes, take the bentonite after grinding according to the corresponding mass ratio, add ethylene glycol with 3 times the quality of bentonite, and stir at 70 ° C 15 minutes, and then take the correspon...

Embodiment 1

[0027] A magnesium oxide refractory material, its composition and corresponding mass percentages are: 40% forsterite, 20% magnesium oxide, 15% calcium oxide, 15% yttrium oxide, 9% binder, and 1% plasticizer.

[0028] The preparation method of magnesia refractory material: the forsterite is subjected to clean water removal of impurities and magnetic separation to remove iron, and then dried at 80°C, and the dried forsterite is ground until it can be sieved through a sieve of more than 80 mesh, according to the above quality Ratio Take the ground forsterite and other raw materials respectively, mix the ground forsterite with magnesium oxide, calcium oxide and yttrium oxide evenly, add the prepared binder to the mixture, and mix for 15 minutes at 50°C. Continue to add the prepared plasticizer, mix for 15 minutes, then dry at 220°C for 10 hours, calcine at 1500°C for 2 hours, cool down to 1000°C and keep it for 2.5 hours, cool it down to 550°C and keep it for 2.5 hours, then cool i...

Embodiment 2

[0030] A magnesium oxide refractory material, its components and corresponding mass percentages are: 55% forsterite, 17% magnesium oxide, 13% calcium oxide, 5% yttrium oxide, 5% binder, and 5% plasticizer.

[0031]The preparation method of magnesia refractory material: the forsterite is subjected to clean water removal of impurities and magnetic separation to remove iron, and then dried at 80°C, and the dried forsterite is ground until it can be sieved through a sieve of more than 80 mesh, according to the above quality Ratio Take the ground forsterite and other raw materials respectively, mix the ground forsterite with magnesium oxide, calcium oxide and yttrium oxide evenly, add the prepared binder to the mixture, and mix for 15 minutes at 50°C. Continue to add the prepared plasticizer, mix for 15 minutes, then dry at 250°C for 11 hours, calcine at 1600°C for 2 hours, cool down to 1100°C for 4 hours, cool to 580°C for 4 hours, and cool to 250°C for heat preservation After 2.0...

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Abstract

The invention discloses a magnesium oxide refractory material composed of the components by the mass percentage: 40%-60% of forsterite, 15%-20% of magnesium oxide, 5%-15% of calcium oxide, 5%-15% of yttrium oxide, 5%-9% of a binding agent, and 1-5% of a plasticizer. With the mass of the forsterite as 100%, the particle size ratios of forsterite comprise that the content of forsterite with the particle size of 8-5 mm is 20%-30%, the content of forsterite with the particle size of 5-3 mm is 50%-65%, the content of forsterite with the particle size of 3-1 mm is 10%-15%, and the content of forsterite with the particle size of less than 1 mm is less than or equal to 5%. Magnesium oxide and forsterite are calcined and sintered at high temperature, and thus the refractory material has high refractoriness; yttrium oxide can make the body of the refractory material densified, and furnace slag is prevented from immersing a refractory material layer thoroughly; calcium oxide and magnesium oxide after being sintered are concentrated to a grain boundary of yttrium oxide to form a solid solution or a compound, so that the densification degree of yttrium oxide is facilitated, and good resistance to alkaline slag and iron slag is achieved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium oxide refractory material with excellent corrosion resistance, good thermal shock resistance and outstanding slagging prevention effect and a preparation method thereof. Background technique [0002] Mullite is an aluminosilicate mineral formed at high temperature. As a high-quality refractory material, it has the advantages of high strength, high melting point, and low thermal conductivity. It is now widely used in various industries such as steel, nonferrous metals, and chemicals. In kilns, thermal equipment and structures in the field. However, when mullite is used as a refractory material, there are still the following deficiencies: 1) Mullite is a high-alumina mineral, and its main component is 3Al 2 o 3 2SiO2 2 , as a refractory material, it is easily corroded when used in equipment with an alkaline atmosphere such as a steelmaking furnace. 2) W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/622
CPCC04B35/043C04B35/622C04B2235/3206C04B2235/3208C04B2235/3225C04B2235/349
Inventor 胡宏平
Owner 迁安市明杰耐火材料有限公司