Effect of Ultrafine Spinel Sources on Slag Resistance and Microstructure of Alumina-spinel Castables

作者：YU Renhong,LIU Ping,LIU Pengcheng,CHEN Weihao,GAO Jianying,LI Jiwei

摘要：In order to clarify the effect of ultrafine spinel sources on slag resistance and microstructure of alumina -spinel castables,using tabular alumina and spinel as coarse aggregates, tabular alumina powders,spinel powders,calcium aluminate cement,spinel containing cement, spinel micro-powder and reactive alumina ultra-fines as matrix, alumina - spinel castables used for RH snorkels were prepared by changing the particle size and sources of preformed spinel. The effects of different ultra-fine spinel sources (CMA72, spinel micro-powder) on the properties of alumina- spinel castables were investigated. Thermal shock resistance and slag resistance of specimens were compared by the residual strength rate (1100℃, air cooling 1 cycle) and static crucible method. The microstructure and the slag corrosion resistance mechanism of the specimens were analyzed by SEM and EDS. The result shows that slag resistance of alumina-spinel castables can be improved by adding ultra-fine preformed spinel, such as CMA72, and spinel micro-powder. The introduction of ultra-fine preformed spinel has little effect on HMOR of alumina - spinel castables, but has negative effect on TSR. ultra-fine and dispersive preformed spinel in the matrix and fine microstructure are the main reasons for the improvement of slag resistance of castables.

发文机构：Henan University of Science and Technology Imerys Aluminates （China） Henan Higer High Temperature Materials Co.

关键词：alumina-spinelCASTABLESultra-fineSPINELCMA72SLAGresistance

分类号： TQ[化学工程]