In Situ Monitoring and Dissolution Limit of Carbon Dissolution in Hot Metal

Abstract

Isothermal and nonisothermal experiments are conducted to characterize the dissolution processes of carbonaceous materials into iron. The nonisothermal process shows that the dissolution of graphite into iron is mainly divided into solid-phase and liquid-phase dissolution. The carbon dissolution into solid iron accelerates the phase transition and melting of iron. Isothermal experiments indicate that the dissolution process is divided into three stages: rapid carburizing (0À60 min), slow carburizing (60À180 min), and dissolution equilibrium (180À360 min). In addition, the dissolution behavior of different carbon materials is compared and analyzed. The disorder of carbon matrix and the existence of ash are important factors that influence the carbon dissolution kinetics and dissolution limit. Pores provide a location for ash migration under high temperature so that it does not aggregate at the ironÀcarbon interface. In addition, the irregular interconnected pores also provide a larger reaction contact area for carburizing.