Improvement in Reaction Rate and Decrease in Reaction Temperature of Iron Ore-Carbon Composite by Increasing Pressure
Reduction behavior of the composite of iron ore and carbonaceous materials has been studied by many researchers to use as a potential burden for suppressing CO2 emission from the ironmaking process.So far,however,its usage seems to be limited under a standard condition of the blast furnace.In this study,the effect of elevated pressure,up to 8.0MPa,on the reduction of the composite was examined.Hematite,iron ore and graphite reagents were used for the preparation of the composite samples.The composite sample was put into the electric furnace in a high pressure chamber and then heated at a heating rate of 10K/min.Target temperature and pressure were varied.Weight loss fraction (WLF) was obtained by the difference between sample masses before and after reduction,and reduction degree of iron oxide and gasification degree of carbon were calculated by the chemical analysis.Under higher pressures,there was a remarkable increase in WLF of composite sample heated to the temperature higher than 1123K.Further,reduction and gasification reactions tended to proceed at lower temperature with increasing pressure.These can be attributed to a promotion effect of the high pressure on the heat transfer inside the composite.
ironmaking iron ore-carbon composite reduction gasification high pressure
ZHOU Qi Naohiro TSUDA Tachi MURAKAMI Eiki KASAI
Graduate School of Environmental Studies,Tohoku University,6-6-02 Aramaki,Aoba-ku,Sendai 980-8579,Japan
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-5
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）