Reaction Behavior and Transformation Path of Zinc in the Heating-Up Zone during Sintering Process

Wei Lv, Min Gan (), Xiaohui Fan (), Zengqing Sun, Rongchang Zhang, Zhiyun Ji and Xuling Chen
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Wei Lv: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
Min Gan: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
Xiaohui Fan: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
Zengqing Sun: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
Rongchang Zhang: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
Zhiyun Ji: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
Xuling Chen: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China

Sustainability, 2022, vol. 14, issue 16, 1-14

Abstract: Iron ore sintering is a simple and sustainable way to treat zinc-bearing secondary resources. In this paper, the reaction behavior of zinc was studied by combining thermodynamic calculation and simulation tests under sintering temperature and atmosphere. The evolution law of Zn-containing phases during the heating process was also revealed. The results showed that Zn-containing substances were mainly converted to ZnO when the temperature reached 700 °C in the pre-drying zone, and ZnO started to combine with Fe 2 O 3 to form ZnFe 2 O 4 when the temperature reached 800 °C in the combustion zone. ZnFe 2 O 4 remained stable at 1300 °C, and did not change in the atmosphere with low CO concentration. In conventional sintering conditions, the removal rate of zinc was about 5 wt%, zinc was mainly converted to ZnFe 2 O 4 and stuck in the sinter. Therefore, to meet the zinc amount of the blast furnace load, pretreatment of raw materials or ore matching to control zinc content is necessary.

Keywords: zinc; iron ore sintering; reactive behavior; phase evolution (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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