This refining flux is a conventional refining agent for LF furnaces, and is mainly used for Al-free and Al-controlled steels. This refining flux can be added with lime or used alone to purify the molten steel as refining slag. After being used, it can be melted quickly and the refining molten steel effectively. At the same time, a excellent effect of melting and arc-submerging in the early stage can improve power transmission in the pre-refining period and reduce the power consumption.