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| Molybdenum oxide direct alloying technology for smelting molybdenum steel in converter |
| LÜ Ming1, WANG Yucong1, YANG Meng2, SUN Bo2, ZHANG Zhaohui1, CAI Kunkun1 |
1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China;
2. Smelting Branch, Jinduicheng Molybdenum Industry Co., Ltd., Weinan 714000, Shaanxi, China |
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Abstract Using molybdenum oxide instead of ferromolybdenum for direct alloying smelting molybdenum steel can reduce the production process of ferromolybdenum and reduce costs, but the high-temperature volatilization characteristics of molybdenum oxide hinder the application of direct alloying technology of molybdenum oxide. To ensure that the converter adopts molybdenum oxide alloying process to achieve high molybdenum yield, the thermodynamic mechanism for the reduction reaction of molybdenum oxide in different stages of converter blowing was studied. It is found that multiple elements in the liquid metal are reducing agents which can generate reduction reaction with molybdenum oxide in steelmaking process. In the early and middle stages of blowing, the content of reducing agent in the molten pool is high and the volatilization rate of molybdenum oxide is low, and adding molybdenum oxide can obtain a higher yield of molybdenum at this time. The kinetics of molybdenum oxide reaction is analyzed, and it is found that the limiting link of reaction is the diffusion of reducing agents onto the surface of molybdenum oxide. On this basis, high-temperature experiments are conducted, and the results show that the alloying effect of molybdenum oxide is better than that of ferromolybdenum. In the early and middle stages of blowing, the content of [C] and [Si] in the liquid metal is relatively high, and the yield of molybdenum during molybdenum oxide alloying is over 95% at this time. The inclusions in the finished steel are analyzed and the main inclusions are sulfides and alumina. Molybdenum oxide alloying will not increase inclusions in the steel. The research results provide theoretical and technical support for the direct alloying of molybdenum oxide in the steelmaking process to smelt molybdenum containing steel.
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Received: 07 July 2023
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2023, Vol. 33 
