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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.
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- 0.5 mm) + sintered spinel, 28% tabular corundum fines mm) + bimodaα-Al 2 O 3 micropowder + Secar 71 cement. The on-site results show that the plug can achieve an obviously long service life of 18 cycles, saving cost greatly.