Thermal Sintered Magnesite Refractory Bricks
For Industrial And Cement Furnace Refractory Thermal Sintered Magnesite refractory Brick
Main damage mechanism and material configuration of refractory materials in various parts of RH vacuum furnace
At high temperature, vacuuming and top gun blowing oxygen decarburization, some components in the vacuum tank working lining refractory are volatilized, resulting in damage to the refractory structure. Under the high-speed steel flow scouring and air scouring, the bricks are easier to be washed. Erosion.
In the vacuum tank, the top gun blows oxygen for strong decarburization and secondary combustion to heat the molten steel. The impact of the high-heat flame and the erosion and penetration of the FeO-SiO2-MnO-Al2O3 acid slag cause damage to the refractory lining.
The high alkalinity desulfurization slag agent CaO-CaF2-Al2O3 added into the vacuum tank has low melting point, low viscosity and good fluidity, and has serious erosion and penetration to refractory materials.
The top gun brushes cold steelvacuum tank for heating and heat preservation in the smelting gap, and bakes and heats the vacuum tank before smelting. The high temperature flame will erode the refractory material, and the oxidation of the metal components in the cold steel (containing a small amount of slag) will cause the refractory material to erode and penetrate the material. damaged.
The reciprocating change of the atmosphere in the vacuum tank, such as oxidation and vacuum reduction, causes the valence of the variable valence elements in the refractory material to change, so that the refractory material has a volume effect. If the stress exceeds the bearing limit of the material, the refractory material will be destroyed.
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index item |
magnesia-alumina brick |
magnesia-alumina spinel brick |
Periclase-spinel brick |
high-purity mag-alumina brick |
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MgO% ≥ |
80 |
80 |
80 |
75 |
70 |
82 |
80 |
86 |
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AL2O3% ≥ |
510 |
510 |
815 |
815 |
815 |
510 |
510 |
510 |
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0.2MPa refractoriness under load 0C ≥ |
1600 |
1580 |
1700 |
1650 |
1600 |
1620 |
1600 |
1700 |
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cold crushing strength MPa ≥ |
45 |
40 |
35 |
35 |
35 |
39.2 |
39.2 |
35 |
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apparent porosity % ≤ |
18 |
20 |
17 |
18 |
19 |
18 |
18 |
16 |
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thermal shock resistance (11000C-water) times ≥ |
20 | 15 | 10 | 7 | 5 |
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FLow chart
Company Profile
China Rare Earth Holdings Co., Ltd. is a large cross-regional company with its headquarter registered in Hong Kong. It is a company listed on the Hong Kong Stock Exchange (name: China Rare Earth, code: 0769). Yixing Xinweilicheng Refractories Co., Ltd. is a wholly-owned subsidiary of China Rare Earth Holdings Co., Ltd. and one of the pillar industries of the holding company. The company covers an area of 360,000 square meters and a building area of 240,000 square meters. It has more than 1,000 employees, of which scientific and technological personnel account for 30% of the total number of employees.
Over the years, the company has closely followed the development pace and trend of the international and domestic refractory material markets, invested heavily in expansion and reconstruction, adjusted the industrial structure, and constantly pursued and surpassed development. With the support and help of many close partners at home and abroad, and the sincere unity and hard work of all employees, the company has become one of the important bases for domestic production of medium and refractory materials.
Company advantage
- Founded in the 1984, listed on the Hong Kong Stock Exchange on October 15, 1999 (name: China Rare Earth, code: 0769)
- The company is headquartered in Yixing, with branches in Shanghai and Hong Kong
- Professional manufacturer of Rare Earth and refractories
- The top 3 supplier of refractories in China
- covers an area of 360,000 square meters and a building area of 240,000 square meters.More than 2,000 employees, Scientific and technological personnel account for 30% of the total number of employees.
- Obtained more than 11 patent certificates
- Established a technical cooperation relationship with Japan Krosaki Harima Corp.
- Long-term supply to Japan Nippon Steel, Japan NKK, Kimizu, Aoida and Nisingkou steel Co
Commencement Ceremony and Signing Ceremony of Technical Trade Cooperation with Japan Krosaki Harima Corp.
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