Thermodynamic Evaluation of Cr_2O_3-Al_2O_3 Refractory Corrosion by Smelting Reduction Ironmaking Slag

The interfacial reactions of Cr2O3- Al2O3 refractory materials with smelting reduction ironmaking slag were investigated by thermodynamic modeling. The calculation results indicated that different spinel phases were produced after the interactions between the slag and three types of refractory materials( 10Cr2O3- 90Al2O3,50Cr2O3- 50Al2O3 and 90Cr2O3- 10Al2O3) at 1 500℃. Increased contents of Al2O3 and Cr2O3in the remained liquid slag after interaction implied the dissolution of refractory. Thermodynamic modeling predicted that the process of dissolution might lead to much deeper penetration into the refractory materials by the present compositional slag. Accordingly,corrosion testing was also conducted to validate the thermodynamic prediction.