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| Melting and reduction behavior of core-shell microsphere in steel slag |
| SUN Tao-an1, CAO Rui-hong2, XIA Yun-jin1, WANG Hai-chuan1, FAN Ding-dong1, DENG Ai-jun1,2 |
1. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243032, Anhui, China;
2. Technology Center, Xinyu Iron and Steel Group Co., Ltd., Xinyu 338001, Jiangxi, China |
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Abstract The ultimate goal of this study is the application of steel slag fibrosis. The application technology of core-shell structure in polymer materials science is introduced into the field of iron and steel metallurgy for efficient reduction and refactoring of molten steel slag. The melting and reduction behavior of core-shell microsphere in slag was studied by using ultra-high temperature laser confocal microscope. The effects of temperature and acidity coefficient on the melting rate of microsphere reduction base were analyzed. The results show that when the core-shell microsphere is suspended in the middle part of the slag,the melting reduction reaction reaches the equilibrium state 6 min earlier than that of the conventional powder reduction. The reduction and recovery timeliness of metal oxides in slag is obviously improved. The comparison of core-shell microsphere with different reduction substrates show that the aluminum-based microsphere exhibits an excellent reduction timeliness,and the reduction rate reaches 95.17% within 3 min. The slag with high temperature and high acidity coefficient can promote the rapid melting of core-shell microsphere and effectively improve the thermodynamic conditions of reduction reaction. It can improve the timeliness of metal oxides in reduction slag,and achieve the effect of rapid separation of slag and metal. Based on the melting kinetics model of the substrate and slag interface of microsphere,the effective binary diffusion coefficients of microsphere reduction substrate range from 3.86×10-11 to 4.92×10-11 m2/s under different conditions. For the industrial application of steel slag refactoring and modification by reducing substrate,carbon can be used as the main reducing substrate and an appropriate amount of aluminum or silicon can be added to prepare the core-shell microsphere for the reduction and refactoring of steel slag,which can significantly improve the timeliness of the reduction and refactoring of steel slag and achieve high economic benefits. It provides a new idea for the efficient reduction of steel slag.
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Received: 23 May 2022
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2023, Vol. 58 
