Kinetic studies on the reduction of iron ore nuggets by devolatilization of lean-grade coal
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第12期
论文作者：Chanchal Biswas Prithviraj Gupta Arnab De Mahua Ghosh Chaudhuri Rajib Dey
文章页码：1360 - 1368
摘 要：An isothermal kinetic study of a novel technique for reducing agglomerated iron ore by volatiles released by pyrolysis of lean-grade non-coking coal was carried out at temperature from 1050 to 1200°C for 10–120 min. The reduced samples were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and chemical analysis. A good degree of metallization and reduction was achieved. Gas diffusion through the solid was identified as the reaction-rate-controlling resistance; however, during the initial period, particularly at lower temperatures, resistance to interfacial chemical reaction was also significant, though not dominant. The apparent rate constant was observed to increase marginally with decreasing size of the particles constituting the nuggets. The apparent activation energy of reduction was estimated to be in the range from 49.640 to 51.220 kJ/mol and was not observed to be affected by the particle size. The sulfur and carbon contents in the reduced samples were also determined.
Chanchal Biswas1，Prithviraj Gupta1，Arnab De2，Mahua Ghosh Chaudhuri3，Rajib Dey1
1. Department Metallurgical and Material Engineering, Jadavpur University2. Department of Metallurgy and Materials Engineering, Indian Institute of Engineering,Science & Technology3. School of Materials Science and Nano Technology, Jadavpur University
摘 要：An isothermal kinetic study of a novel technique for reducing agglomerated iron ore by volatiles released by pyrolysis of lean-grade non-coking coal was carried out at temperature from 1050 to 1200°C for 10–120 min. The reduced samples were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and chemical analysis. A good degree of metallization and reduction was achieved. Gas diffusion through the solid was identified as the reaction-rate-controlling resistance; however, during the initial period, particularly at lower temperatures, resistance to interfacial chemical reaction was also significant, though not dominant. The apparent rate constant was observed to increase marginally with decreasing size of the particles constituting the nuggets. The apparent activation energy of reduction was estimated to be in the range from 49.640 to 51.220 kJ/mol and was not observed to be affected by the particle size. The sulfur and carbon contents in the reduced samples were also determined.
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