熔融石英及ρ-Al_2O_3对镁质中间包挡渣墙性能影响研究
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摘要
本论文从MgO-Al_2O_3-SiO_2系相图出发,研究了添加熔融石英、ρ-Al_2O_3对镁质中间包挡渣墙性能影响研究。第一部分研究以硅微粉为结合剂通过添加具有低热膨胀系数的不同粒度熔融石英来提高镁质浇注料的抗热震稳定性。添加熔融石英后提高了镁质浇注料的热震稳定性,添加熔融石英颗粒效果更好。随着熔融石英加入量的增加对c/s比高的渣抗渣渗透能力逐渐增强,抗渣侵蚀能力逐渐减弱,添加熔融石英颗粒的效果好于添加熔融石英细粉。第二部分在第一部分的基础上,利用ρ-Al_2O_3作结合剂取代部分硅微粉来降低基质部分中硅含量,添加一定量的熔融石英颗粒后,对c/s比高的中间包钢渣抗侵蚀和渗透深度分别降低了2.84mm和3.44mm;而对c/s比低的中间包钢渣抗侵蚀和渗透效果不理想。第三部分为了进一步提高抗渣性能,用棕刚玉细粉取代镁砂细粉并引入少量MA细粉促进MA的生成后,对c/s比低的中间包钢渣具有良好的抗渣侵蚀和渗透性能,而对c/s比高的中间包钢渣抗渣侵蚀和渗透性能稍差。第四部分对抗渣机理进行了SEM研究:通过M2S和MA的生成而产生体积膨胀,一方面可以封闭气孔,另一方面可以形成一定数量、大小适当的微裂纹能阻止裂纹扩展,提高其热震稳定性。MA可以吸收渣中的FeO、MnO形成无限固溶体提高了熔渣的粘度,同时Al_2O_3可以吸收渣中的CaO进一步提高渣的粘度,能更好的抑制中间包钢渣对试样的侵蚀和渗透。
The effect of addition of fused silica, andρ-Al_2O_3 on magnesia tundish weir was investigated through the MgO-Al_2O_3-SiO_2 phase diagram in this paper. In the first part, fused silica of different grain size with low thermal expansion coefficient was added into the magnesia material to improve its thermal shock resistance using the micro powder silica as the binder. The thermal shock resistance of magnesia castables is able to be improved by adding fused silica, the effect of adding fused silica particle is significantly better than that of fused silica powder. With the increase of the melting quartz content, the slag corrosion resistance to high CaO/SiO_2 ratio capacity gradually increases. And capacity of slag penetration resistance gradually diminishes, the effect of addition fused silica particles are better than that of adding fused silica powder. On the base of the former research, the second part in this paper usesρ-Al_2O_3 as a binder to replace part of micro silica in order to reduce the silicon content of host material. Addition of suitable fused silica particles help to improve the capability of penetration resistance and corrosion resistance of higher CaO/SiO_2 ratio, the erosion and penetration depth decreased by 2.84mm and 3.44mm after experimentation; but the effect of capability of penetration resistance and corrosion resistance of lower CaO/SiO_2 ratio is not obvious. In the third part, in order to improve corrosion resistance, the author uses brown corundum powder replacing magnesia powder and adds some magnesia-alumina fined powder to generate MA. It is more effective on the lower CaO/SiO_2 ratio tundish slag than that of the higher CaO/SiO_2 ratio tundish slag about performance of penetration resistance and corrosion resistance. In the fourth part, the slag penetration resistance is analyzed by SEM, its conclusion is: the volume increased following the produce of M2S and MA, on the one hand it may seal up the blowhole, on the other hand it may form the micro crack with properly quantity and size. The micro crack can prevent the crack expanding and enhance its thermal shock resistance stability. The magnalium spinel may massively absorb FeO, MnO in the dregs to form the unlimited solution to enhance the slag viscosity, Al_2O_3 can absorb CaO in the dregs to further enhance the viscosity of the dregs, it is better to suppress tundish steel corrosion and permeating to the samples.
The effect of addition of fused silica, andρ-Al_2O_3 on magnesia tundish weir was investigated through the MgO-Al_2O_3-SiO_2 phase diagram in this paper. In the first part, fused silica of different grain size with low thermal expansion coefficient was added into the magnesia material to improve its thermal shock resistance using the micro powder silica as the binder. The thermal shock resistance of magnesia castables is able to be improved by adding fused silica, the effect of adding fused silica particle is significantly better than that of fused silica powder. With the increase of the melting quartz content, the slag corrosion resistance to high CaO/SiO_2 ratio capacity gradually increases. And capacity of slag penetration resistance gradually diminishes, the effect of addition fused silica particles are better than that of adding fused silica powder. On the base of the former research, the second part in this paper usesρ-Al_2O_3 as a binder to replace part of micro silica in order to reduce the silicon content of host material. Addition of suitable fused silica particles help to improve the capability of penetration resistance and corrosion resistance of higher CaO/SiO_2 ratio, the erosion and penetration depth decreased by 2.84mm and 3.44mm after experimentation; but the effect of capability of penetration resistance and corrosion resistance of lower CaO/SiO_2 ratio is not obvious. In the third part, in order to improve corrosion resistance, the author uses brown corundum powder replacing magnesia powder and adds some magnesia-alumina fined powder to generate MA. It is more effective on the lower CaO/SiO_2 ratio tundish slag than that of the higher CaO/SiO_2 ratio tundish slag about performance of penetration resistance and corrosion resistance. In the fourth part, the slag penetration resistance is analyzed by SEM, its conclusion is: the volume increased following the produce of M2S and MA, on the one hand it may seal up the blowhole, on the other hand it may form the micro crack with properly quantity and size. The micro crack can prevent the crack expanding and enhance its thermal shock resistance stability. The magnalium spinel may massively absorb FeO, MnO in the dregs to form the unlimited solution to enhance the slag viscosity, Al_2O_3 can absorb CaO in the dregs to further enhance the viscosity of the dregs, it is better to suppress tundish steel corrosion and permeating to the samples.
引文
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[2] 李鑫,何家梅.塔塔钢厂对挡渣墻用耐火材料的探讨.耐火材料,1996,3
[3] Patrick Marechal.电熔镁砂的耐热震性.国外耐火材料.1992,(5):56-58
[4] T.L.Coble.et al in“Structure and Properties of MgO and Al2O3 Ceramics”Ed.by W.D.Kingery, The American Ceramic Society, Inc. Columbus.Ohio,839-852(1984)
[5] D.Chung and W.G.Lawrence.“Relation of Single-crystal Elastic Constants to Polyerstalline Isotropic Elastic Moduli of MgO Temperature Dependence” Journal of The American Ceramic Society,47.448-455(1964)
[6] Naohiro Soga and Orson L.Anderson. High-Temperature Elastic Properties of Polycrystalline MgO- Al2O3 Journal of Tfe American Ceramic Society. 49. 355 -359(1966)
[7] Thennal shock and size effects in castable refractories. J.Am.Ceram.Soc,1995,78 (8):2056-64
[8] Orson L.Anderson and P.Andreatch “Pressure Derivatives of Elastic Constants of Single -Crystal MgO at 23 and-195.8 Journal of The American Ceramic Society,49.404-409 (1966)”
[9] N.Soda and O.N.Anderson.“Simplifide Method for Calculating Elastic Moduli of ceramic Powder from Compressibility and Debye Temperature Data” Journal of The American Ceramic Society,49.318-322 (1966)
[10] 大硂.盛钢桶用碱性浇注料.国外耐火材料,1982,(6)19-23,
[11] 郝北春.含氧化镁的碱性浇注料.国外耐火材料,1997,(4)35-39
[12] 扬素莲.镁质不定形耐材抗水化性技术的发展.耐火信息,1998 9
[13] Kyoden Basic castable.Shinagawa Giho,1989,32 75-86
[14] 祝洪喜,等. SiO2超细粉结合镁质浇注料的研究.耐火材料,1988,(5)18-21
[15] 杨素莲译.高耐水化性 MgO 砂.国外耐火材料,1997,(6)14-18
[16] 李晓明编.《微粉与新型不定形耐火材料》.冶金工业出版社,1997
[17] 张垂昌等编.《相图计算及其在耐火材料中的应用》.冶金工业出版社,1993
[18] 李再耕.盛钢桶用碱性不定形耐火材料耐火材料.1986,(6):50-53
[19] Role of Water in the Mechano Chemical Reaction of MgO-SiO2 Systems.Journal of solid state chemistry 138,169-177(1998)
[20] 徐国英.碱性浇注料在炼钢炉上的应用.新型不定形耐火材料一生产施工与应用,洛阳耐火材料研究院信息标准研究所
[21] 祝红喜,等.轻烧 MgO 结合煤质浇注料的研究.耐火材料,1989,(6):20-22
[22] 张风霞.钢纤维增强的耐火材料国外耐火材料.1998,(2):26-30
[23] 刘根容,等.不锈钢纤维增强耐火浇注料的研究和应用.硅酸盐通报,1989,(4):22-25
[24] 张海萍,汪厚植,顾华志,张文杰.提高镁质浇注料抗热震性的研究.耐火材料,2002 53-54
[25] 世纪新型耐火浇注料及结合剂系统 .《国外耐火材料》,1998 年结合剂专辑
[26] 孙立君,等.碱性耐火材料使用的聚磷酸纳结合剂的性能研究.耐火材料,1984,(2)2003
[27] 寄田容一.磷酸盐结合的浇注料.国外耐火材料,1988,(11)10-13
[28] 任树怀,等.铝酸钙水泥结合 MgO 浇注料内的化学反应.新型不定形耐火材料-生产施工与应用,洛阳耐火材料研究院信息标准研究所
[29] B.Sandberg etc. Microsilica-A Versatile Refractory Raw Materials,India Rrfractory Congress,1994,Feb 14-16,1994
[30] 祝洪喜,李晓明,吴清顺,蔡飞虎.《SiO2超细粉结合镁质浇注料的研究》.耐火材料,5(1988)9-12
[31] 李晓明,吴清顺,蔡飞虎.《特种不定形耐火材料及不烧砖》.冶金工业出版社,1992
[32] 魏耀武.《碱性浇注料的研究》.武汉科技大学,硕士毕业论文,1999
[33] 韩行禄.《不定形耐火材料》.冶金工业出版社,2003
[34] M.Nishil etal“Investigation on Basical Castble Refractories for Teeming Ladle” Conf.Refract,Tokyo,1983.TARJ.pp43-46
[35] Y.Oguchi and J.Mori.“Wear Machanism of Castable for SteelLadle”. Taikabutsu Overseas, Vol 13,NO,19,pp43-46
[36] M.Nishil etal“Investigation on Basical Castble Refractories for Teeming Ladle” First Intnl, Conf.Refract,Tokyo,1983.TARJ.pp43-46
[37] 本乡靖郎.《ρ-氧化铝结合浇注料》.国外耐火材料,1989
[38] 龚楚清.《MgO-CaO-Al2O3浇注料的研究》.武汉科技大学,硕士毕业论文,2000
[39] 陈建奎编著.《混凝土外力剂的原理及应用》.中国计划出版社,1997
[40] Improvement of tundish dan block based on thermal stress analysis . Taikabutsu, 1994, 46(10),525-6
[41] Application of magnesia pre-cast block to tendish weir. Taikabutsu, 1987,39(6),351-354
[42] 廖建国译.添加各种骨料对浇注料破坏特性的影响.国外耐火材料,2003,7:318-322
[43] 刘爱云译.用耐火材料技术的发展.国外耐火材料,2000,25(6):3-9
[44] 王家栋译.日本连铸耐火材料的最新动向.国外耐火材料,1994,19(2):2-12
[45] 高英武译.钢包用铝-镁浇注料的开发.国外耐火材料,1997,22(2):3-7
[46] 庞善洋译.铝镁质浇注料在高温作业钢包中的应用.国外耐火材料,1996,21(2):39-42
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