Fundamental Approach to a Low-carbon Sintering Process of Iron Ores
Low-carbon sintering has been an important target as well as low-carbon operation of blast furnace(BF),since CO2 emission from the iron ore sintering occupies about 14%of the total emissions of an integrated steelworks.It is notable that the backgrounds on the low-carbon technology are a little different between the iron ore sintering and BF processes.A decrease in reducing agent rate of BF may lead to decreases in the formed amount of BF gas and/or coke oven gas.Hence,a certain amount of external energy input will be necessary in order to compensate the energy shortage in the downstream processes.On the contrary,the sintering process usually does not supply a large amount of energy to other processes.It means that lowering the amount of carbonaceous materials used in the sintering process will efficiently lead to a reduction of CO2 emission.Therefore,development of an innovative low-carbon sintering technology is strongly required,which can also produce quality sinter,adapting to the significant change in the iron ore property.Here,a possible approach to a low-carbon sintering technology is discussed considering the characteristics of the sintering process.Dusts,scales and magnetite ores are taken up as potential materials to replace coke as alternative agglomeration agents,since they contain lower oxides of iron,i.e.,Fe,FeO and Fe3O4 and metallic iron,which give heat through oxidation reactions.Oxidation behaviors of Fe in the sintering bed is examined based on the experimental results.
reduction of CO2 emission alternative agglomeration agent metallic iron oxidation reaction coke combustion
Kazuya Fujino Taichi Murakami Eiki Kasai
Graduate School of Environmental Studies,Tohoku University,Sendai,Japan
国内会议
上海
英文
1-8
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）