Metallurgical properties of furnace charge under different conditions of pellet ore and block ore addition
LI Sheng1, HE Zhi-jun1, LI Yun-fei1, QIU Shuang1, ZHAN Wen-long1, BAI Bing-yang2
1. Institute of Metallurgical Energy Optimization and New Technology, Liaoning University of Science and Technology, Anshan 114051, Liaoning, China; 2. Ironmaking Plant, Dalian Special Steel Co., Ltd., Dalian 116105, Liaoning, China
Abstract：For the iron ore variety, quality, volatility of domestic steel enterprises resulting in a decline in blast furnace burden structure stability problem, through laboratory test, the system is studied on the metallurgical properties of iron ore, the high temperature properties of the comprehensive burden structure of the sinter and different kinds of natural lump ore, the sinter and pellet collocation and different kinds of natural ore and pellets. The results show that the reduction performance and the droplet property of sinter are better than that of acid pellets and imported block ore, but the low-temperature reduction degradation phenomenon is very serious, low temperature reduction degradation index RDI>3.15 mm is only 70%. Ha leather lump ore dripping temperature is too low, only about 1 353 ℃. The South Africa ore pressure difference is too large (6 820 Pa), which is not conducive to the stable and anterograde blast furnace. Due to the excellent metallurgical properties of Rio ball and samaco ball, the proportion of them can be appropriately increased in the production of the blast furnace to make up the shortage of sintering capacity and reduce the pollution to the environment. Under the condition of low sintering ratio (55%), using different pellet collocations, the burden of softening and melting interval is narrowed, the Δpm is lowered and the comprehensive performance is obviously improved. The best composite charge structure is 55% sinter +20% Rio pellet +5% Samaco pellet +20% Hopi block ore. With the addition of the new mixed ore burden structure, the soft melting range is narrowed, the Δpmand the S are lowered and the soft melt dripping performance is better.
李胜, 何志军, 李云飞, 仇爽, 湛文龙, 白冰洋. 不同球团矿和块矿配加条件下炉料冶金性能[J]. 钢铁, 2020, 55(1): 6-11.
LI Sheng, HE Zhi-jun, LI Yun-fei, QIU Shuang, ZHAN Wen-long, BAI Bing-yang. Metallurgical properties of furnace charge under different conditions of pellet ore and block ore addition. Iron and Steel, 2020, 55(1): 6-11.
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