Application of Bayer Red Mud-Based Flux in the Steelmaking Process

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• 作者：Yanling Zhang ; Fengshan Li ; Ruimin Wang and Dongdong Tian
• 刊名：steel research international
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：88
• 期：2
• 全文大小：954K
• ISSN：1869-344X

文摘

Bayer red mud is characterized by its highly oxidizing nature (high Fe₂O₃ content) and high alkalinity (high Na₂O content). It can work as an ideal flux and dephosphorizer in the steelmaking process. In this study, laboratory experiments on the use of Bayer red mud-based flux in hot metal dephosphorization and simulated steelmaking processes have been carried out. In hot metal dephosphorization, good slag fluidity and a much better separation between the slag and the melt phases are obtained while using Bayer red mud. This result is attributed to the fact that Al₂O₃ and Na₂O present in Bayer red mud act as a flux and serve to decrease the melting point of the CaO–FeO–SiO₂-based slag. For a mass ratio of Bayer red mud:CaO between 1:1 and 2:1, high hot metal dephosphorization ratios (more than 80%) and low final [P] (lower than 0.018%) are obtained. The experimental results obtained while using Bayer red mud-based flux in simulated steelmaking processes show that good slag fluidity is observed during the entire process. The dephosphorization ratio can be more than 85%, and the final [P] can be lowered to less than 0.005%. No rephosphorization phenomenon is observed in the whole experiment.