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| Strategy analysis and testing study of high ratio of pellet utilized in blast furnace |
| WANG Xin-dong1, JIN Yong-long2 |
1. HBIS Group Co., Ltd., Shijiazhuang 050023, Hebei, China;
2. Technology Research Institute, HBIS Group Co., Ltd., Shijiazhuang 050023, Hebei, China |
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Abstract The advantages and problems of using high-proportion pellets in blast furnaces from the perspective of strategic development were analyzed, and the strategic opportunities for using high-proportion pellets in blast furnaces was clarified. According to the characteristics of domestic high-silicon iron concentration, basic researches on green pellet-making, drying and roasting of magnesia pellets with high silicon acidity and flux properties have been carried out. Furthermore, the compressive strength of pellets, high-temperature metallurgical properties, and ring formation in the production process of rotary kiln have been analyzed. The basic characteristics such as formation mechanism and the design characteristics of the basic operating parameters for pellet production were put forward, and the stable continuous production of high silica magnesia acid and flux pellets produced by the grate rotary kiln was realized. Two high-proportion pellet blast furnace production trials have been completed. Practice has proved that the production of high-proportion pellet smelting blast furnaces was stable and smooth, and all indicators were better than those of high-proportion sinter smelting blast furnaces. The operating ideas can be replicated, the smelting results can be reproduced, the operating experience can be promoted, and the environmental benefits are huge. The emissions of SO2, NOx, PM and CO2 are far superior to blast furnaces produced with a high proportion of sintered ore. It is foreseeable that the preparation of high-quality metallurgical pellets and the smelting of high-proportion blast furnace pellets will be the best measure to break the long-term steel process in China to reduce total pollutant emissions and achieve low-carbon smelting and sustainable development.
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Received: 09 February 2021
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2021, Vol. 56 
