Abstract: Through the experiments of KR desulfurization operation and process parameters, the influencing factors of KR molten iron pre-desulfurization are analyzed and studied. The results show that, amount of blast furnace slag in ladle, insertion depth of stirring paddle, stirring time, stirring speed and quality of stirring paddle have a great influence on desulfurization rate of molten iron. Improvement measures such as the slag is removed before desulfurization, and controlling the insertion depth of the stirring paddle at about 1.0 m, the stirring time is 10–14 min, and the stirring speed is 80 r/min are formulated, and the application effect of improving desulfurization rate is achieved.

Key words: KR desulfurization, stirring paddle, insertion depth, stirring time, stirring speed