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Reducing process of sinter in COREX shaft furnace and influence of sinter proportion on reduction properties of composite burden

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Journal of Central South University 2021年第3期28卷 690-698页

作者： SHI Ben-jing ZHU De-qing PAN Jian HU Bing WANG Zhao-cai Zhongye Changtian International Engineering Co. Ltd.Changsha 410205China Process Research Institute National Engineering Research Center of Sintering and Pelletizing Equipment SystemChangsha 410205China key laboratory of hunan province for the synergetic control and resource reuse of the multi-pollutants of flue gas Changsha 410205China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

In order to reduce the materials cost of COREX ironmaking process,sinter has been introduced into the composite burden in *** work explored the reducing process of sinter in COREX shaft furnace to clarify its reduction properties change and then the effect of sinter proportion on metallurgical performance of composite burden was *** results show that the reducing process of sinter in COREX shaft furnace was basically same with that in blast furnace but sinter seems like breaking *** reducing condition simulated COREX shaft furnace,sinter possessed the worst reduction degradation index(RDI)and undifferentiated reduction index(RI)compared with pellet and iron ore *** and microscopic mineralogy changes indicated that sinter presents integral cracking while pellet and lump ore present surface cracking,and no simple congruent relationship exists between cracks of the burden and its ultimate reduction degradation *** existence of partial metallurgical performance superposition between composite and single ferrous burden was ***_(+6.3)≥70%and RDI_(+3.15)≥80%were speculated as essential requirements for the composite burden containing sinter in COREX shaft furnace.

关键词： sinter COREX shaft furnace reducing process composite burden reduction degradation index(RDI) metallurgical performance

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