Evolution of deposited carbon during multi-stage fluidized-bed reduction of iron ore fines

作     者：Zhan Du Qingshan Zhu Feng Pan Zheng Zou Zhaohui Xie Hongzhong Li 

作者机构：State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SdencesBelting 100190China University of ChineseAcademy of SciencesBeijing 100049China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2018年第16卷第6期

页      面：11-19页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Grant No. 21736010) 

主　　题：Carbon deposition Multi-stage fluidized-bed reduction Carbon deposits Surface morphology 

摘      要：The influence of reduction conditions on carbon deposition during fiuidized-bed pre-reduction of iron ore fines was investigated *** results showed that reduction temperature and the composition of reducing gases had a significant effect on the rate of carbon deposition and the type of carbon deposits (graphite and Fe3C).Low reduction temperature,high CO content,and addition of H2favored the deposition of carbon,especially *** reduction conditions also significantly affected the surface morphology of the as-reduced iron ore *** the amount of deposited graphite increased,the formation of fibrous iron disappeared and graphite filaments were *** pre-reduced iron ore fines were further fiuidized in pure CO at 850℃ for final *** results showed that graphite could suppress the formation of fibrous iron and decrease the surface viscosity,thereby inhibiting agglomeration during the final high-temperature reduction *** that consume the deposited carbon during the final high-temperature reduction were identified and graphite was shown to be more reactive than *** enhance the application of fluidization technology in producing sponge iron,a novel solid-state high-temperature reduction method via deposited carbon was proposed and demonstrated to be feasible.