Influence of Ferrovanadium Slag on Bauxite Based Self-flow Castables

摘要

Bauxite based self-flow castables were prepared by using bauxite,ferrovanadium slag,microsilica,high efficient admixture as main starting materials,and calcium aluminate cement as binder.The cold modulus of rupture,cold crushing strength and permanent linear change were determined.The phase constituents of the specimens were analyzed by X-ray diffraction (XRD),and the microstructure was observed with scanning electron microscopy (SEM).The experimental results show that with increasing the addition of ferrovanadium slag,the strength of specimens dried at 110 ℃ decreases,while the strength of specimens fired at 1 350 ℃ first increases and then decreases,the bulk density of specimens slightly decreases,the crystalline phase content of the formed magnesium-aluminate spinel increases in the structure and the permanent linear change (PLC) of spec imens transforms from contraction to expansion.The appropriate addition of ferrovanadium slag is beneficial to improve the sintering strength and volume stability of bauxite based castables and the optimal addition of ferrovanadium slag is 40 mass％.