The Basic Research Of Alumina Based Self-Flow Castable

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.