Desiliconization Reaction of Pig Iron with MnO Containing Blast Furnace Slag under Pressurized and Coke-coexisting Condition

For the clarification of the mechanism of the desiliconization reaction by the MnO containing slag under pressurized and coke-coexisting condition of blast furnace, fundamental experiments were performed by the use of a pressurized high frequency furnace. Based on the experimental results, a mathematical simulation model with consideration of the direct reduction reaction as the coupled reaction was developed and applied to the quantitative evaluation of the desiliconization reaction by the MnO and FeO containing slag.The following knowledge was obtained.1) Under the existence of coke, MnO and FeO are partly consumed by the coupled reaction of direct reduction reaction and the desiliconization reaction is restrained.2) The increase of pressure, with the presence of coke, results in the indirect enhancement of the desiliconization reaction through the restraint of the direct reduction reaction.3) The effect of the charging of Mn ore on both the increase of Mn content and the decrease of Si content in pig iron was quantitatively evaluated by a simulation model for blast furnace hearth.