| 摘要 |
PURPOSE:To perform preliminary desiliconization operations efficiently in the stage of preliminarily siliconizing the molten iron from a blast furnace in a ladle by iron oxide by adding carbon materials after addition of the iron oxide thereby preventing the foaming of the molten slag in the ladle and prevening the decrease in the rate of receiving the molten iron in the ladle. CONSTITUTION:In the stage of receiving molten iron from a blast furnace into a ladle, iron oxide such as mill scale is added and easy to oxidize Si is presiliconized as SiO2 . At this time, gaseous CO2 is generated in the decarburization reaction by the iron oxide that takes place to a certain extent simultaneously and the molten slag formed by desiliconization reaction is foamed whereby the volume of the molten iron to be received in the ladle is decreased. In order to prevent such decrease, the iron oxide added with carbon materials such as coke powder is added at >=50kg per ton. The escaping of the gaseous CO2 is improved by the improved fluidity of the molten slag owing to the combustion of the coke and the foaming of the molten slag is decreased, whereby the preliminary refining by the desiliconization is accomplished efficiently without decreasing the rate of receiving of the molten iron into the ladle. |
