Low cement Al2O3-SiO2 castables was prepared using super grade bauxite(w(Al2O3)>85%) as aggregate,brown fused corundum,silicon carbide,Secar 71 CA cement,α-Al2O3 micropowder and microsilica as fine powders.The influence of SiC(0,5 wt%,10 wt%,and 15 wt%)on resistance to PbO-rich slag was investigated by static crucible slag test(1 300 ℃ for 5 h,in air).The slag corrosion mechanism of the castables was analyzed by means of SEM,EDS and XRD.The results show that the resistance of Al2O3-SiO2 castables to PbO-rich slag is improved obviously by the addition of SiC.The corrosion mechanism of the PbO-rich slag can be discribed as that PbO in the slag reacts with SiO2 and CaO in Al2O3-SiO2 castables,forming low-melting compounds(such as PbO·SiO2 and 2PbO·SiO2).
展开▼
