Corundum -spinel castables containing lightweight aggregates have drawn many attentions due to their po- tential for energy-saving, especially when applied in the high-temperature region, such as the work lining of re...Corundum -spinel castables containing lightweight aggregates have drawn many attentions due to their po- tential for energy-saving, especially when applied in the high-temperature region, such as the work lining of refi- ning ladle. One main aspect that restricts their applica- tion is the slag corrosion performance. In this study, one dense tabular corundum and three kinds of lightweight corundum were chosen as aggregates to prepare four dif- ferent corundum - spinel castables. The slag resistance was compared through the induction furnace corrosion test. SEM - EDS, XRD, and thermodynamic and kinet- ics analysis were adopted for the discussion of the corro- sion mechanism. Results show that the crystal grain size and shape of aggregates are important for the slag corro- sion resistance of lightweight corundum -spinel castables under dynamic condition （enforced convection） , yet the effects of pore characteristics are not dominated. Aggre- gates with large flake-like crystal grains show a thicker dissolution diffusion boundary layer and a lower dissolution rate, resulting in a favorable corrosion resist- ance of the castable. The poor microstructure of the ag- gregates, namely, larger pores and small and spherical grains, would cause deterioration of castables＇ slag resistance.展开更多
基金The National Natural Science Foundation of China(Grant No.51204126 and No.51474165)
文摘Corundum -spinel castables containing lightweight aggregates have drawn many attentions due to their po- tential for energy-saving, especially when applied in the high-temperature region, such as the work lining of refi- ning ladle. One main aspect that restricts their applica- tion is the slag corrosion performance. In this study, one dense tabular corundum and three kinds of lightweight corundum were chosen as aggregates to prepare four dif- ferent corundum - spinel castables. The slag resistance was compared through the induction furnace corrosion test. SEM - EDS, XRD, and thermodynamic and kinet- ics analysis were adopted for the discussion of the corro- sion mechanism. Results show that the crystal grain size and shape of aggregates are important for the slag corro- sion resistance of lightweight corundum -spinel castables under dynamic condition （enforced convection） , yet the effects of pore characteristics are not dominated. Aggre- gates with large flake-like crystal grains show a thicker dissolution diffusion boundary layer and a lower dissolution rate, resulting in a favorable corrosion resist- ance of the castable. The poor microstructure of the ag- gregates, namely, larger pores and small and spherical grains, would cause deterioration of castables＇ slag resistance.
