Abstract
Blast furnace (BF) flue dust is a by-product and collected from the gas cleaning systems during the blast furnace ironmaking process, which can be recycled as one of the secondary sources due to the valuable contents of iron and carbon. A novel in-flight reduction technology is considered to allow utilizing the large quantities of fine iron-bearing metallurgical dust directly to bypass the sintering/pelletization and conventional coke-making steps. In this work, the reduction behavior and kinetic mechanism of the blast furnace dust during in-flight process in hydrogen atmosphere are studied with lab-scale high-temperature drop tube furnace. The effects of temperature and gas composition on the reduction degree are examined. With the morphological observation, it is found that the unreacted shrinking core model can describe the in-flight reduction process . According to the kinetic analysis, the rate-controlling step is determined as the chemical reaction at the particle surface. The activation energy Ea is determined to be 224.8 kJ/mol and the pre-exponent factor A as 7.2 × 106 m/s.
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References
Xu G (2015) Applied basic research on recycling of blast furnace dust. Ph.D. thesis, University of Science and Technology, Beijing
Deng YC, Jia SQ, Wu SL, Jiang YJ (2015) Removal of the harmful elements and iron recovery from the blast furnace gas ash by chloridizing roasting. Iron Steel Vanadium Titanium 36:51–56
Lanzerstorfer C, Kroppl M (2014) Air classification of blast furnace dust collected in a fabric filter for recycling to the sinter process. Resour Conserv Recycl 86:132–137
Zhao D, Zhang JL, Wang GW, Conejo AN, Xu RS, Wang HY, Zhong JB (2016) Structure characteristics and combustibility of carbonaceous materials from blast furnace flue dust. Appl Therm Eng 108:1168–1177
Leimalm U, Lundgren M, Okvist LS (2010) Off-gas dust in an experimental blast furnace part 1: characterization of flue dust, sludge and shift fines. ISIJ Int 50(11):1560–1569
Stecko J, Stachura R, Nieslar M, Bernasowski M, Klimczyk A (2018) Utilisation of metallurgical sludge by multi-layer sintering. Ironmaking Steelmak 45(9):779–786
Lanzerstorfer C, Bamberger-strassmayr B, Pilz K (2015) Recycling of blast furnace dust in the iron ore sintering process: investigation of coke breeze substitution and the influence on off-gas emissions. ISIJ Int 55(4):758–764
Hu T, Lv XW, Bai CG (2016) Enhanced reduction of coal-containing titanomagnetite concentrates briquette with multiple layers in rotary hearth furnace. Steel Res Int 87(4):494–500
Chung SH, Kim KH, Shon II (2015) DRI from recycled iron bearing wastes for lower carbon in the blast furnace. ISIJ Int 55(6):1157–1164
Wang HT, Sohn HY (2012) Hydrogen reduction kinetics of magnetite concentrate particles relevant to a novel flash ironmaking process. Metall Mater Trans B 44(B):133–145
Chen F, Mohassab Y, Zhang SQ, Sohn HY (2015) Kinetics of the reduction of hematite concentrate particles by carbon monoxide relevant to a novel flash inromaking process. Metall Mater Trans B 46(B):1716–1728
Qu Y, Yang Y, Zou Z, Zeilstra C, Meijer K, Boom R (2015) Reduction kinetics of fine hematite ore particles with a high temperature drop tube furnace. ISIJ Int 55(B):952–960
Qu Y, Yang Y, Zou Z, Zeilstra C, Meijer K, Boom R (2015) Melting and reduction behavior of fine hematite ore particles. ISIJ Int 55(1):149–157
Takeuchi N, Nomura Y, Ohno K, Maeda T, Nishioka K, Shimizu M (2007) Kinetic analysis of spherical wustite reduction transported with CH4 gas. ISIJ Int 47(3):386–391
Srinivasan NS, Lahiri AK (1977) Studies on the reduction of hematite by carbon. Metall Mater Trans B 8(b):175–178
Tiwari P, Bandyopadhyay D, Ghosh A (1992) Kinetics of gasification of carbon and carbothermic reduction of iron oxide. Ironmaking Steelmak 19:464–468
Piotrowski K, Mondal K, Wiltowski T, Dydo P, Rizeg G (2007) Topochemical approach of kinetics of the reduction of hematite to wustite. Chem Eng J 131(1–3):73–82
Li B, Wang H, Wei YG (2012) Kinetic analysis for non-isothermal solid state reduction of nickel laterite ore by carbon monoxide. Trans Inst Min Metall C 121(C):178–184
Acknowledgements
This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 51574065, 51574066, 51774072, 51774073).
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Xu, J., Wang, N., Chen, M., Yu, H. (2020). Recycling of Blast Furnace Flue Dust with In-flight Reduction Technology: Reduction Behavior and Kinetic Analysis. In: Chen, X., et al. Energy Technology 2020: Recycling, Carbon Dioxide Management, and Other Technologies. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36830-2_35
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DOI: https://doi.org/10.1007/978-3-030-36830-2_35
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