Low Si which accompanies the melting reduction of the Mn ore it is low production null of the P high Mn

摘要

PURPOSE: To provide the low-Si, low-P, high-Mn molten iron by increasing the Mn concn. in the molten iron by smelting reduction of Mn ore and subjecting the molten iron to desiliconization and clephosphorization. ;CONSTITUTION: A mixture composed of quicklime and the powdery Mn ore is added to the molten iron tapped from a blast furnace in such a manner that the basicity attains 1.5 to 4.0 to desiliconize the molten iron. In succession, a carbonaceous material and a flux compounded with one or ≥2 kinds of CaF₂, Al₂O₃, and CaCl₂ are added together with the mixture composed of the quicklime and the powdery Mn ore to the molten iron after the desiliconization, by which the dephosphorization and the reduction of the Mn ore are simultaneously progressed. As a result, the Mn concn. of the molten iron is increased by using the Si in the molten iron for reduction of the Mn ore without using costly ferromanganese.;COPYRIGHT: (C)1994,JPO&Japio