| 【文章摘要】 Corundum- spinel purging plugs were optimized through adjusting the formulation and the particle size composition of starting materials to prolong the service life of purging plugs for a 60 t refining ladle in a stee plant. The optimized formulation is 30 mass% tabular corundum( 6- 3 mm),20 mass% tabular corundum( 3- 1 mm),22 mass% tabular corundum( 1- 0. 5mm) + sintered spinel,28% tabular corundum fines( 0. 045 mm) + fused spinel( 0. 045 mm) + bimodaα-Al_2O_3 micropowder + Secar71 cement. The on-site results show that the plug can achieve an obviously long service life of 18 cycles,saving cost greatly. |