1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2.Science and Technology of Flash Ironmaking of Beijing, Co., Ltd., Beijing 100083, China
Abstract:Abstract:The final C content of molten iron in the blast furnace smelting process is close to saturation, while that in flash ironmaking process is unexpected, since there is no solid charge pressing the deadman and consequently no carburization reaction that occurs between the deadman bottom and the hot metal. In order to study the process of coke dissolving into the molten iron in coke bed, a series of experiments and relevant numerical simulations were carried out. Electrolytic iron and chemically pure grapaite were used as raw meterials, and a tubular resistance furnace was employed to heat the samples up to 1823K until melting them. The highpurity Ar was injected as protective gas throughout the experiments. The experimental results show that the C content in the final iron decreases with increasing the coke particle size and reducing the height of the carburized bed. The initial C content in the molten iron has a great influence on the final carburization value. To clarify the migration law of C element in the process of molten iron carburizing reaction under different conditions, the numerical simulations were conducted based on VB programing technology. The simulated results are in good agreement with the high temperature experimental data, with the relative error of below 3%. The percolation velocity control factor is at about 05, in other words, the average velocity of molten iron in the coke bed is about half of the initial dropping velocity.
华福波,张伟,朱雷,薛正良,张文海. 焦炭床内铁水渗碳行为[J]. 钢铁研究学报, 2019, 31(7): 612-619.
HUA Fu-bo,ZHANG Wei,ZHU Lei,XUE Zheng-liang,ZHANG Wen-hai. Carburizing behavior of molten iron in coke bed. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(7): 612-619.