MOLTEN IRON PRETREATING METHOD, AND MOLTEN IRON PRETREATMENT CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To determine highly accurately a desiliconization treatment time in molten iron pretreatment using a revolving furnace.SOLUTION: A molten iron pretreating method includes: a molten iron datum acquisition step of acquiring initial molten iron data including an initial concentration of molten iron components containing at least Si, Fe and C; an estimation step of sequentially estimating a molten iron Si concentration and a Si equilibrium concentration in a slag-metal boundary surface, by using a combined reaction model made by combining an ignition point reaction, and a slag-metal interfacial reaction advancing in an area different from an ignition point area as an area where the ignition point advances, based on the acquired initial molten iron data, and time-series exhaust gas data including the components and flow quantity of exhaust gas discharged from a revolving furnace; and a desiliconization treatment end determination step of determining as a desiliconization treatment end point, a point when a difference between the estimated molten iron Si concentration and Si equilibrium concentration becomes a prescribed threshold level or less.SELECTED DRAWING: Figure 1