Author:
Gao Lihua,Huang Yibin,Zhan Wenlong,Wang Chuan,He Zhijun,Pang Qinghai,Zhang Junhong
Abstract
AbstractThe interfacial phenomenon between liqiuid iron and coke is important for determining the melting efficiency in the blast furnace iron-making process. In this study, the interaction observed in the case of the iron-carbon (Fe–C) melt on coke substrate was investigated using a high-temperature vacuum wettability test equipment. The Fe–C melt did not wet and spread on the coke substrate with different graphitization degrees (r0) at a high temperature of 1450 °C. The contact angles changed from 124.5° to 105.3°, and the r0 increased from 9.30 to 50.00%, thus indicating a nonwetting state. The deepening of graphitization decreased the contact angle. Thereby, increasing the contact area between liquid iron and the carbonaceous material, which facilitated carbon dissolution. The irregular movements of Fe–C melt were observed in situ during the wetting process. The horizontal force of the droplet caused by interfacial tension and the contact angle; the Marangoni convection owing to the gradient of carbon concentration; and the impulse force caused by the generation, aggregation, and release of SiO bubbles at the interface were attributed to the driving force.
Funder
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Reference30 articles.
1. An, R. Y. et al. Potential of energy savings and CO2 emission reduction in China’s iron and steel industry. Appl. Energy 226, 823–834 (2018).
2. Liu, Z. J., Zhang, J. L. & Yang, T. J. Low carbon operation of super-large blast furnaces in China. ISIJ Int. 55(6), 1146–1156 (2015).
3. Gupta, S. et al. Mineralogy and reactivity of cokes in a working blast furnace. Fuel Process. Technol. 117, 30–37 (2014).
4. Zhang, C. L. et al. Numerical simulation of combustion behaviors of hydrochar derived from low-rank coal in the raceway of BF. Fuel 278, 118267 (2020).
5. Q.B. Meng. Development achievements of China's coking industry and support for the development of the steel industry. In: The 8th (2011) China Annual Meeting, Beijing, (2012) 1–4.