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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 3    March 2021

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Reducing process of sinter in COREX shaft furnace and influence of sinter proportion on reduction properties of composite burden
SHI Ben-jing(师本敬)1, 2, 3, ZHU De-qing(朱德庆)4, PAN Jian(潘建)4, HU Bing(胡兵)1, 2, 3, WANG Zhao-cai(王兆才)1, 2, 3

1. Zhongye Changtian International Engineering Co., Ltd., Changsha 410205, China;
2. Process Research Institute, National Engineering Research Center of Sintering and
Pelletizing Equipment System, Changsha 410205, China;
3. Key Laboratory of Hunan Province for the Synergetic Control and Resource Reuse of
the Multi-Pollutants of Flue Gas, Changsha 410205, China;
4. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:In order to reduce the materials cost of COREX ironmaking process, sinter has been introduced into the composite burden in China. This 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 investigated. The 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 faster. Under 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 lumps. Macroscopic 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 performance. The existence of partial metallurgical performance superposition between composite and single ferrous burden was confirmed. RDI+6.3≥70% and RDI+3.15≥80% were speculated as essential requirements for the composite burden containing sinter in COREX shaft furnace.

 

Key words: sinter; COREX shaft furnace; reducing process; composite burden; reduction degradation index (RDI); metallurgical performance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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