刚玉自流浇注料的基础研究
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摘要
随着世界冶金行业特别是钢铁行业的迅猛发展,冶金行业对耐火材料的要求也越来越高,冶金行业的高技术应用及推广使得许多高档耐火材料应用变得越来越广泛,国外在这一方面走在前列。本实验课题针对国内钢铁行业的实际情况,对国产刚玉及其微粉进行了一系列的研究,对刚玉基自流浇注料进行了基础实验工作。论文对国内外所做的相关工作进行了深入、细致地阐述,并在前人所研究的基础之上,将整个实验分为无硅微粉系统和含硅微粉系统进行。其中无硅微粉系自流浇注料的研究对今后国内刚玉基自流浇注料的应用及其推广具有重要的作用。
     本实验过程分三步:首先利用zeta电动电位仪研究氧化铝微粉、硅微粉、水泥以及刚玉微粉的本身特性,再利用zeta电动电位仪和NDJ-1型绝对粘度计对构成自流浇注料的基质进行zeta电位和粘度的测定及分析。最后对自流浇注料的流动性以及综合物理性能进行实验及分析。整个实验均按照无硅微粉系统和含硅微粉系统进行的。依照上述实验方法得出刚玉自流浇注料所必备的条件:刚玉自流浇注料中的细粉(-0.044mm)总量应小于35%;在无硅微粉系统中的Andreassen公式的粗端q值和细端q值分别为0.23和0.32,氧化铝微粉、水泥的最佳加入量是7%、4%,且所使用的分散剂为改性聚丙烯酸钠最好,而在含硅微粉系统中的Andreassen公式的粗端q值和细端q值分别为0.21和0.29,氧化铝微粉、硅微粉和水泥的最佳加入量为6%、2%和4%,最好合用三聚磷酸钠和六偏磷酸钠作为分散剂。
     通过对刚玉自流浇注料的基础实验,所总结出的实验规律亦可适用于所有的矾土基自流浇注料。同时也是含镁质材料如镁砂、镁铝尖晶石等自流浇注料实验工作的前期铺垫。因而该实验具有一定的发展意义和应用价值。
With the development of metallurgy industry, esp. iron & steel industry in the world, the requirement on refractories is getting much more strictly. Many high-quality refractories are applied widely in metallurgy industry today, in according with applying and spreading of high-tech. The overseas refractories take lead in this field. A series of studies have been done hereby on the subject of domestic made corundum and micro-powder in according with our practical national iron and steel industry in this paper. This paper accounts for relevant jobs at home and abroad in detail and deeply, divided this experiment into two systems on the basis of the studies of ancestor: the non-microsilica system and the microsilica bonded system, among which the studies for non-microsilica alumina based self-flow castable will have important effect on applying and spreading of alumina based self-flow castable in domestic market in the future.
    This experimental process includes three parts. Studying the properties of active a-alumina, microsilica, calcium alumina cement and micro-powder by zeta-potential meter is the first part, determining and analyzing the zeta-potential and viscosity of matrix by zeta-potential meter and NDJ-1 viscosity meter is the second one, and studying the pot life and physical properties of self-flow castable by relevant instruments as the third part. All the processes are always performed with respect to two systems. The results from the experiment are: the amount of all micro-powders that grain sizes are less 0.044 mm should be less than 35% in weight, and the value of coarse q and attenuate q should be respectively 0.23 and 0.32, and the additive amount of active a-alumina and calcium alumina cement should be respectively 7% and 4% in weight, meanwhile, the best dispersant is PMAA-NH4 in the non-microsilica system; while the value of two q should be respectively 0.21 and 0.29, the amount of active a-alumina, microsilica and calcium alumina cement should be respectively 6%, 2% and 4% in weight, the best dispersants are sodium hexamer taphosphate and Na2P3Oio in the microsilica system. The alumina based self-flow castable can be only got when all above those are got.
    The experimental regularity from the studying on alumina based self-flow castable can be fitted for the bauxitic-type self-flow castable, which is also the base of studying MgO-MgAl2O4-Al2O3 self-flow castable at the same time. This experiment has hereby certain developing significance and practical value.
引文
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