Migration behavior of chlorine elements in iron-making process of Jiuquan Iron and Steel (Group) Co., Ltd.
JIANG Xintai1, LU Fenglin1, SHI Huangyu2, WANG Cui3, ZHANG Jianliang2
1. Hongxing Iron and Steel Co., Ltd., Jiuquan Iron and Steel(Group) Co., Ltd., Jiayuguan 735100, Gansu, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Abstract:The migration behavior of chlorine in the iron-making process has an important influence on the chlorine load of the blast furnace, the metallurgical performance of raw materials and fuels, the gas pipeline system, the TRT power generation system, and the refractory of the hot stove. With the obvious development of large-scale and intensive blast furnaces, the proportion of large-scale blast furnaces increases year by year, and the erosion of chlorine elements brings great economic losses to steel enterprises. To clarify the various sources and discharges of chlorine elements in the blast furnace and the erosion mechanism, it is necessary to take the three processes of ore benefaction, sintering and blast furnace as a whole and study the migration path of chlorine elements, which can provide a theoretical basis for reducing the chlorine load of the blast furnace and its hazards to the blast furnace and auxiliary system. Taking a blast furnace of Jiuquan Iron and Steel (Group) Co., Ltd. (Jiuquan Steel) as the research object, the materials charged and produced in the three processes of ore benefaction, sintering and blast furnace were sampled, and the chlorine content of the samples was detected by ion chromatography. Through chlorine equilibrium calculation, it was found that most of the chlorine was brought in by the Heigou ore in the ore beneficiation process, most of the chlorine was brought in by the self-produced concentrate in the sintering process, and iron-containing burdens were the largest source of chlorine, followed by coke and pulverized coal in the blast furnace. In addition to the chlorine brought out with the blast furnace gas, the proportion of chlorine brought out by the rest of the bag ash is also high. Given the chlorine load of the blast furnace in Jiuquan Steel, the amount of chlorine entering the ore benefaction process, sintering process and blast furnace system should be reduced from the source, and the chlorine removal of dust ash should be carried out in the sintering process, and the circulation enrichment of chlorine in the blast furnace should be reduced, which could greatly reduce the hazards caused by chlorine to the blast furnace and its ancillary equipment.
蒋心泰, 鲁逢霖, 施煌禹, 王翠, 张建良. 酒钢铁前系统氯元素迁移行为[J]. 钢铁, 2023, 58(6): 53-60.
JIANG Xintai, LU Fenglin, SHI Huangyu, WANG Cui, ZHANG Jianliang. Migration behavior of chlorine elements in iron-making process of Jiuquan Iron and Steel (Group) Co., Ltd.[J]. Iron and Steel, 2023, 58(6): 53-60.
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