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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 7, 2022
Revised August 23, 2022
Accepted September 15, 2022

Acknowledgements: his research was financially supported by the Open Foundation of State Key Laboratory of Mineral Processing (BGRIMMKJSKL-2022-12) and the Ph.D. start-up fund of Jiangsu University of Science and Technology (120140004) in China.

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mechanisms and kinetics of zinc and iron separation enhanced by calcified carbothermal reduction for electric arc furnace dust

Jiayong Qiu^{1 2 4} Shui Yu^{1 3 4†} Jiugang Shao³ Kaiqi Zhu^{1 4} Dianchun Ju^{1 4} Chunyu Chen^{1 4} Dexing Qi^{1 4} Fei Wang³ Ni Bai^{1 4} Rui Mao^{1 3†} Xiaoming Wang²

¹School of Metallurgical and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China ²State Key Laboratory of Mineral Processing, Beijing 102628, China ³Institute of Research of Iron and Steel, Sha-Steel, Zhangjiagang 215625, China ⁴Institute of Fine Metallurgy Research, Industrial Technology Research Institute of Zhangjiagang & Jiangsu University of Science and Technology, Zhangjiagang 215600, China

yushuijust@163.com, maorui0138@163.com

Korean Journal of Chemical Engineering, April 2023, 40(4), 975-985(11), 10.1007/s11814-022-1295-9

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Abstract

A high basicity charge prepared with electric arc furnace dust (EAFD), carbonaceous reducing agent and CaO is proposed. The mechanisms of enhancing separation of zinc and iron by calcified carbothermic reduction of the high basicity charge were analyzed by combining thermal analysis kinetics and experiment. The influences of roasting temperature, carbon ratio (nc/no, molar ratio of carbon in graphitic carbon powder to oxygen in EAFD), and CaO dosage on phase transition and dezincification ratio in EAFD were investigated. The results show that the intermediates Ca2Fe2O5 and Fe0.85xZnxO can be produced from the zinc-iron separation of zinc ferrate during the process of calcified carbothermic reduction of EAFD. Addition of CaO and C results in the following transition pathways: ZnFe2O4+ CaOCa2Fe2O5+ZnOCa2Fe2O5+Zn(g)CaO+Fe; Fe0.85xZnxO+CaOCa2Fe2O5+FeO+ZnOCaO+Fe+Zn(g). In the range of nc/no of 0.4-1.2 and roasting temperature of 1,000-1,100 o C, the addition of CaO can promote reduction and dezincification. Based on the Kissinger-Akahira-Sunose (KAS) and Coats-Redfern methods, the kinetic results show that the calcified carbothermic reduction process can be divided into three stages: initial stage (=0-0.3), middle stage (=0.3-0.45), and final stage (=0.45-1.0). The average activation energy of the initial stage is 305.01 kJ·mol1 , and the reaction mechanism is one-dimensional diffusion. The average activation energy is 315.67 kJ·mol1 for the middle stage and 288.22 kJ·mol1 for the final stage. The chemical reaction equation is found to be the most suitable mechanism in the medium and final stages. It is also found that the addition of C

Keywords

EAF Dust Calcified Carbothermic Reduction Phase Transition Kinetics Non-isothermal

References

1. World Steel Association: https://worldsteel.org.
2. D. Z. Wang, D. Q. Zhu, J. Pan, Z. Q. Guo, H. Y. Tian and Y. X. Xue,J. Iron Steel Res. Int., 2, 1 (2022).
3. H. Berber, K. Tamm, M. Leinus, R. Kuusik, K. Tonsuaadu, P. Paaver and M. Uibu, Waste. Manag. Res., 38, 2 (2019).
4. P. J. W. K. D. Buzin, N. C. Heck and A. C. F. Vilela, J. Mater. Res.Technol., 6, 2 (2017).
5. C. Wang, Y. F. Guo, S. Wang, F. Chen, Y. J. Tan, F. Q. Zheng and L. Z. Yang, Int. J. Min. Met. Mater., 27, 26 (2020).
6. X. Cao, Z. G. Wen, X. L. Zhao, Y. H. Wang and H. R. Zhang, Sci.Total Environ., 717, 137114 (2020).
7. D. Z. Wang, D. Q. Zhu, J. Pan, Z. Q. Guo, C. C. Yang, X. Wang and T. Dong, JOM, 74, 2 (2022).
8. J. Q. Song, C. Peng, Y. J. Liang, D. K. Zhang, Z. Lin, Y. Liao and G. J. Wang, Hydrometallurgy, 202, 105599 (2021).
9. A. H. Mohammad, A. N. Jomana, A. O. Awni, A. H. Israa, A. J.Huda, A. Z. Mais and A. A Shaima, J. Environ. Chem. Eng., 7, 1(2018).
10. X. L. Lin, Z. W. Peng, J. X. Yan, Z. Z. Li, J. Y. Hwang, Y. B. Zhang,G. H. Li and T. Jiang, J. Clean. Prod., 149, 1079 (2017).
11. B. S. Kim, J. M. Yoo, J. T. Park and J. C. Lee, Mater. Trans., 47, 9(2006).
12. W. Lv, M. Gan, X. H. Fan, Z. Y. Ji and X. L. Chen, J. Mater. Res. Technol., 8, 6 (2019).
13. T. Guo, X. J. Hu, H. Matsuura, F. Tsukihashi and G. Z. Zhou, ISIJ Int., 50, 8 (2010).
14. M. H. Morcali, O. Yucel, A. Aydin and B. Derin, J. Min. Metall. B,48, 2 (2012).
15. Y. X. Zheng, J. Ning, W. Liu, P. J. Hu, J. F. Lu and J. Pang, Int. J. Min.Met. Mater., 28, 358 (2021).
16. S. Thomas, K. Bart, V. A. Karel and B. Bart, J. Clean. Prod., 65, 152(2014).
17. N. Tzouganatos, R. Matter, C. Wieckert, J. Antrekowitscn, M. Gamroth and A. Steinfeld, Jom-Us, 65, 12 (2013).
18. O. Mamdouh and F. Timo, Sep. Purif. Technol., 210, 867 (2018).
19. C. F. Romchat, I. Yosuke, U. Naoyoshi, I. Satoshi and N. Tetsuya,Int. J. Min. Met. Mater., 22, 8 (2015).
20. I. Satoshi, T. AKira, M. Y. Kazuyo, N. Kenichi and N. Tetsuya, ISIJ Int., 48, 10 (2008).
21. C. F. Romchat, M. Katsuya, M. Takahiro and N. Tetsuya, Hydrometallurgy, 159, 120 (2016).
22. M. Takahiro, C. F. Romchat, M. Katsuya and N. Tetsuya, J. Hazard. Mater., 302, 1 (2016).
23. H. E. Kissinger, Anal. Chem., 29, 11 (1957).
24. T. Ozawa, Thermochim. Acta, 203, 159 (1992).
25. J. H. Flynn, Thermochim. Acta, 203, 519 (1992).
26. A. W. Coats and J. P. Redfern, Nature, 201, 4914 (1964).
27. R. Z. Hu and Q. Z. Shi, Thermal analysis dynamics, Science Press.Publications, Beijing (2008).
28. G. Iwase and K. Okumura, ISIJ Int., 61, 10 (2021).
29. Y. Z. Liu, X. M. Lu, Z. X. You and X. W. Lu, Powder Technol., 362,C (2020).