Evolution Characteristics and Influence Mechanism of Binder Addition on Metallurgical Properties of Iron Carbon Agglomer
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THE demand for steel in China is increasing with the further development of industrialization and urbanization. As a result, energy and fuel consumption in steel industry have increased rapidly, which places a serious burden on the environment and climate, especially the greenhouse effect. The consumption of fossil fuels has produced large quantities of CO2 greenhouse gases.[1,2] In China, the CO2 emission from the steel industry accounts for approximately 15 pct of the whole domestic carbon dioxide emissions, and the CO2 discharged JIWEI BAO, ZHENGGEN LIU, DONG HAN, LAIGENG CAO, JUN GUO, and ZICHUAN ZHAO are with the School of Metallurgy, Northeastern University, Shenyang 110819, People’s Republic of China. MANSHENG CHU is with the State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, People’s Republic of China. Contact e-mail: [email protected] HONGTAO WANG is with the School of Metallurgy Engineering, Anhui University of Technology, Ma’anshan 243032, People’s Republic of China. Contact e-mail: [email protected] Manuscript submitted March 24, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS B
from the BF ironmaking system accounts for about 80 pct of the total steel industry.[3–5] Moreover, with the reducing of coking coal resources in China and the rising price of coking coal, the development and utilization of non-coking coal will be of great significance.[6] Therefore, the BF ironmaking is facing the double pressures of high-quality resources shortage and carbon emission reduction in China, and it is urgent to develop the cutting-edge technology of low carbon BF ironmaking. Iron coke (or iron carbon agglomerates ICA) is one of the core technologies of low carbon BF ironmaking. As an innovative technology of low carbon BF ironmaking, iron coke has attracted more and more attentions. Iron coke is a carbon iron composite material with high reactivity. The raw material source of iron coke can be weak caking and non-caking coals, which greatly expands the raw material source and reduces the production cost. It was proposed by Naito et al.[7–10] that the utilization of highly reactive coke (carbon iron composite CIC, iron coke or ferro-coke) was considered to be an effective countermeasure to realize low carbon BF through decreasing the temperature of thermal reserve zone. It is generally believed
that the temperature of thermal reserve zone in BF is mainly determined by the starting temperature of coke gasification reaction.[11] Highly reactive iron coke can reduce the temperature of thermal reserve zone, which leads to an increase in the difference between the actual concentration and the equilibrium concentration of CO in the BF gas. As a result, the reduction driving force of iron oxide inside the BF is improved. The partial replacement of traditional coke with highly reactive iron coke in BF can improve the reaction efficiency of BF, and reduce the fuel ratio and CO2 emission.[7–10] Nowadays, the preparation process of iron coke mainly includes traditional coke oven pr
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