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| Research progress on melting behavior of steel scrap in iron-carbon bath |
| MA Guo-jun1,2, LIU Meng-ke1,2, ZHANG Xiang1,2, ZHENG Ding-li1,2, YAO Wang-long1,2 |
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2. Hubei Provincial Key Laboratory of New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
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Abstract It has become the goal of the world steel industry to gradually reduce the proportion of iron ore and increase the proportion of steel scrap so as to attain the steel recycling in the process of ferrous metallurgy. The melting behavior of steel scrap is the key factor that controls the temperature trajectory and scrap ratio of BOF, as well as the energy consumption and productivity of EAF. Simultaneously, the melting behavior of steel scrap in hot metal ladle may also affect the operation of hot metal pretreatment process. It is of great significance to study the melting behavior of steel scrap to improve the utilization rate of steel scrap in converter, electric arc furnace, hot metal ladle, and ensure the stability of ferrous metallurgical process. The previous researches are summarized in order to provide theoretical guidance and experimental basis for improving the utilization rate of steel scrap in actual smelting process. The research progress on the melting behavior of steel scrap in iron-carbon bath is reviewed, including the melting mechanism of steel scrap and the effects of bath temperature, bath carbon content, preheating temperature, size of steel scrap and gas stirring on the melting behavior of steel scrap. It involves the application of numerical calculation and simulation, thermal simulation and cold model investigation. The melting behavior of steel scrap mainly includes the formation and remelting of solidified layer, and the carburizing and melting of parent steel scrap. With the increase of bath temperature and bath carbon content, the decrease of steel scrap size, the melting rate of steel scrap increases gradually. The preheating temperature has little effect on the melting rate in the later stage. Improving the gas stirring conditions can increase the melting rate of steel scrap and shortens the mixing time of bath. Meanwhile, as the bath temperature and bath carbon content increasing, the specific surface area of steel scrap and the bath stirring intensity are both increased, the heat and mass transfer process between bath and steel scrap is enhanced, the heat transfer coefficient between melt and steel scrap and the mass transfer coefficient of carbon are increased.
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Received: 09 October 2021
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2022, Vol. 57 
