8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

The wetting behavior of calcium ferrite (CF) slag on TiO2 substrate at 1523K was investigated using an improved sessile drop method. The initial apparent contact angle was 30°-50°, and the final apparent contact angle was less than 20°. The CF-TiO2 system is reactive wetting system, and the wetting process was divided into four stages. Stage I: physical spreading; stage II: reaction at the interface controlled spreading; stage III: reaction at the triple phase line controlled spreading (spreading on CaTiO3); stage IV: Equilibrium. The interfacial microstructure of residual slag after wetting was roughly divided into three layers. The top layer of residual slag was composed of CaTiO3 and Fe2O3, the middle layer was composed of CaTiO3 and Fe2TiO5, and the bottom layer was composed of Fe2TiO5. The mechanism of interfacial chemical reaction was discussed using the coexistence theory of slag structure, and the results indicating that the formation of CaTiO3 was mainly in the initial reaction process, then was the formation of Fe2TiO5 in the final reaction process.