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| Burden particle segregation behavior and its optimization under blast furnace operation with high pellet charging ratio |
| ZHAO Li-hui1, WANG Wei1, HU Peng2, ZHENG Kui1,2, WANG Bin1, XIE Ming-liang1 |
1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430080, Hubei, China;
2. Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China |
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Abstract Increasing the proportion of pellets in blast furnace is an important means of low carbon smelting in blast furnace. Because of the strong rolling property of pellets, there will be the problem of particle size segregation in the charging process of blast furnace. Therefore, optimizing the distribution system and reducing the segregation of charge size are of great significance to improve the airflow distribution in the upper part of blast furnace. A physical model was established to study the effects of pellet ratio, ore batch weight and chute angle on the segregation of blast furnace charge. The results show that increasing pellet ratio can reduce particle size difference and improve particle size segregation of charge. Based on the experimental results, multiple regression model was established for predicting segregation index of charge particle size. It is found that the segregation index of charge particle size increases gradually with the increase of chute angle. When the chute angle is greater than 32°, the increase range of segregation index becomes smaller. The segregation index of charge particle size increases first and then decreases with the increase of ore batch weight. When the proportion of pellets is fixed, large batch weight and small chute angles, or small batch weight and large angle chute angles can effectively reduce the particle size segregation of the charge. The research results can provide reference for optimizing and adjusting the charging regulations of blast furnace melting with high proportion pellet.
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Received: 27 December 2022
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2023, Vol. 33 
