High temperature low heat conduction refractory material and production process thereof
A refractory material and low thermal conductivity technology, applied in the field of refractory materials, can solve the problems of high thermal conductivity and affect the carbon content of steel, so as to improve the toughness and thermal shock resistance, and improve the effect of heat preservation
Active Publication Date: 2011-04-20
ANGANG STEEL CO LTD
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Problems solved by technology
[0006] Deficiencies in the current process technology: the slag line uses a ladle of magnesium-carbon refractory material, which has a large thermal conductivity; the production of clean steel, especially ultra-low carbon automotive sheet steel with strict carbon content requirements, may affect the carbon content in the steel
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[0033] The invention uses electric fused magnesia aggregate, magnesite micropowder, calcium zirconate micropowder and binder as raw materials, and processes it into a refractory castable with a certain particle size.
[0034] The weight percentages of the materials involved are:
[0035] Fused magnesia aggregate 30% to 75%,
[0036] Magnesite powder: 5% to 10%;
[0037] Calcium zirconate powder: 5% to 20%;
[0038] Binder: 5% to 15%.
[0039] Among them, the weight percentage content of (MgO) in the aggregate fused magnesia is ≥96%
[0040] Particle size: by weight percentage
[0041] 5~8mm: 1%~10%;
[0042] 3~5mm: 15%~25%;
[0043] 1~3mm: 15%~25%;
[0044] 0~1mm: 5%~15%;
[0045] Magnesite powder (MgCO 3 ) weight percentage content ≥ 90%, particle size greater than 1000;
[0046] Calcium zirconate (CaZrO 2 ) weight percentage content ≥ 95%; particle size is less than 100-300 mesh.
[0047] The binder involved is cement and clay or one of them.
[0048] Production...
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Abstract
The present invention discloses a high temperature low heat conduction refractory material and production process thereof, which uses fused magnesia aggregate, magnesite micro powder, calcium zirconate micro powder and agglutinant as raw materials. The raw materials are processed into refractory castable in a proper grain size. The refractory material comprises: fused magnesia aggregate thirty percent to seventy-five percent by weight; magnesite micro powder five percent to ten percent by weight; calcium zirconate micro powder five percent to twenty percent by weight; agglutinant five percentto fifty percent by weight. The production process of the refractory material is as follows: mixing the raw materials well in proportion in a mixer, molding by a high stroke friction press, drying the molded product, sintering the molded product at the temperature of 1200 to 1400 DEG C for five to ten hours. Compared with the present refractory materials, the invention is advantaged by: improvingtoughness, resistance to thermal shock, erosion and penetration, and reducing temperature drop in the heat-transfer process of molten steel in steel ladle. Because magnesite micro powder of greater than 1000 meshes is used as raw material and well distributed tiny pores are produced by micro powder at a high temperature, the heat conductivity of the material is reduced and the effect of heat-insulation is improved.
Description
technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a refractory material used for working layers and insulation layers of high-temperature equipment such as ladles, tundishes and kilns for steelmaking, in particular to a high-temperature and low-thermal-conduction refractory material and a production method. Background technique [0002] The temperature of molten steel in the ladle is an important technical indicator in the production of steelworks, and reducing the temperature drop of molten steel in the ladle is an important factor to ensure smooth production. The temperature drop of molten steel in the ladle is mainly through the heat dissipation of the molten steel surface, the heat dissipation of the lining and the initial baking temperature of the ladle. At present, the baking temperature of the empty ladle can reach 1000°C; in order to prevent heat dissipation on the surface of the molten steel in the ladle, the...
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IPC IPC(8): C04B35/66C04B35/622
Inventor 栗红陈本文李德刚康伟金学峰王晓峰常桂华
Owner ANGANG STEEL CO LTD