Kinetics of Iron Carburization via Slag Containing Sulfur at 1723 K

Abstract

Kinetics of iron carburization via CaO-SiO₂-Al₂O₃ slag containing sulfur at 1723 K was investigated. The simulated blast-furnace (B.F.) slag (CaO/SiO₂=1) containing sulfur and high basicity slag (CaO/SiO₂=7.6) containing sulfur were prepared. The rate of carburization of iron through the high basicity slag containing sulfur was higher than the rate of carburization of iron through the simulated blast-furnace slag containing sulfur. Furthermore, the rate of carburization of iron through the slag containing sulfur was higher than the rate of carburization of iron through the slag without sulfur. On the other hand, the rates in the middle stage of carburization of iron through the slag containing sulfur were k=6.15×10^–5 mol/m²·s (the simulated blast-furnace slag) and k=1.35×10^–4 mol/m²·s (the high basicity slag), and were much higher than the other stages, and were influence by the existence of sulfur in the slag. The rates in the last stage of carburization of iron through the slag containing sulfur were k=2.95×10^–5 mol/m²·s (the simulated blast-furnace slag) and k=6.21×10^–5 mol/m²·s (the high basicity slag), and were closed to the rates carburization of iron through the slag without sulfur, and were not influenced by the existence of sulfur in the slag.