700°C氢基直接还原氧化铁：球团与微观组织尺度的异质性

马焱; R. Souza Filho Isnaldi; 张雪; Nandy Supriya; Barriobero-Vila Pere; Requena Guillermo; Vogel Dirk; Rohwerder Michael; Ponge Dirk; Springer Hauke; Raabe Dierk

doi:10.1007/s12613-022-2440-5

Volume 29 Issue 10

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(10): 1901-1907

Yan Ma, Isnaldi R. Souza Filho, Xue Zhang, Supriya Nandy, Pere Barriobero-Vila, Guillermo Requena, Dirk Vogel, Michael Rohwerder, Dirk Ponge, Hauke Springer, and Dierk Raabe, Hydrogen-based direct reduction of iron oxide at 700°C: Heterogeneity at pellet and microstructure scales, Int. J. Miner. Metall. Mater., 29(2022), No. 10, pp. 1901-1907. https://doi.org/10.1007/s12613-022-2440-5

Cite this article as:

Yan Ma, Isnaldi R. Souza Filho, Xue Zhang, Supriya Nandy, Pere Barriobero-Vila, Guillermo Requena, Dirk Vogel, Michael Rohwerder, Dirk Ponge, Hauke Springer, and Dierk Raabe, Hydrogen-based direct reduction of iron oxide at 700°C: Heterogeneity at pellet and microstructure scales, Int. J. Miner. Metall. Mater., 29(2022), No. 10, pp. 1901-1907. https://doi.org/10.1007/s12613-022-2440-5

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研究论文Open Access

700°C氢基直接还原氧化铁：球团与微观组织尺度的异质性

1)
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
2)
Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3)
Institute of Materials Research, German Aerospace Center (DLR), Linder Höhe, 51147 Cologne, Germany
4)
Lehr- und Forschungsgebiet Metallische Strukturen und Werkstoffsysteme für die Luft- und Raumfahrt, RWTH Aachen University, 52062 Aachen, Germany
5)
Institut für Bildsame Formgebung, RWTH Aachen University, Intzestraße 10, 52072 Aachen, Germany

通讯作者:
马焱 E-mail: y.ma@mpie.de

Raabe Dierk E-mail: d.raabe@mpie.de

文章亮点

(1) 系统地、定量地研究了氢基直接还原氧化铁球团矿过程中，在球团和微观组织尺度反应的异质性。

(2) 在微观尺度，进一步揭示了氢基还原氧化铁过程中速度限制环节及其机理。

(3) 总结并提出了进一步优化氢基还原氧化铁球团的方向。

中文摘要

由于使用含碳物质作为铁矿石还原的还原剂以及燃料，钢铁生产过程排放了所有工业二氧化碳排放量总和的三分之一，使其成为全球变暖的关键驱动因素。因此，众多研究工作旨在研究用绿色氢气代替含碳还原剂还原铁矿石。氢基直接还原是一种有吸引力的加工技术，因为直接还原炉在钢铁行业中已被广泛应用，虽然目前甲烷和一氧化碳作为主要还原剂。相比于碳基还原剂，氢气在竖炉球团团聚体的扩散速度快得多。然而，对于大量钢铁生产需求，氢基直接还原的还原动力学仍然非常缓慢，并且氢气消耗量大大超过了化学计量所需的量。因此，本研究的重点是更好地理解铁矿石球团空间梯度、形貌和内部微观结构对氢基直接还原过程中还原效率和金属化率的影响。为此，本研究工作使用了同步辐射加速器高能X射线衍射和电子显微镜以及电子背散射衍射和能量散射X射线谱技术对商业化直接还原球团矿进行了研究。本研究揭示了不同相界面、自由表面及其相关的成核和生长机制的相互作用，为开发快速高效、更适合氢基直接还原的铁矿石球团提供了基础。

关键词:

Research ArticleOpen Access

Hydrogen-based direct reduction of iron oxide at 700°C: Heterogeneity at pellet and microstructure scales

+ Author Affiliations

1)
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
2)
Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3)
Institute of Materials Research, German Aerospace Center (DLR), Linder Höhe, 51147 Cologne, Germany
4)
Lehr- und Forschungsgebiet Metallische Strukturen und Werkstoffsysteme für die Luft- und Raumfahrt, RWTH Aachen University, 52062 Aachen, Germany
5)
Institut für Bildsame Formgebung, RWTH Aachen University, Intzestraße 10, 52072 Aachen, Germany

Corresponding authors:
Yan Ma E-mail: y.ma@mpie.de

Dierk Raabe E-mail: d.raabe@mpie.de
Received: 30 November 2021; Revised: 24 January 2022; Accepted: 15 February 2022; Available online: 17 February 2022

Abstract

Abstract

Steel production causes a third of all industrial CO₂ emissions due to the use of carbon-based substances as reductants for iron ores, making it a key driver of global warming. Therefore, research efforts aim to replace these reductants with sustainably produced hydrogen. Hydrogen-based direct reduction (HyDR) is an attractive processing technology, given that direct reduction (DR) furnaces are routinely operated in the steel industry but with CH₄ or CO as reductants. Hydrogen diffuses considerably faster through shaft-furnace pellet agglomerates than carbon-based reductants. However, the net reduction kinetics in HyDR remains extremely sluggish for high-quantity steel production, and the hydrogen consumption exceeds the stoichiometrically required amount substantially. Thus, the present study focused on the improved understanding of the influence of spatial gradients, morphology, and internal microstructures of ore pellets on reduction efficiency and metallization during HyDR. For this purpose, commercial DR pellets were investigated using synchrotron high-energy X-ray diffraction and electron microscopy in conjunction with electron backscatter diffraction and chemical probing. Revealing the interplay of different phases with internal interfaces, free surfaces, and associated nucleation and growth mechanisms provides a basis for developing tailored ore pellets that are highly suited for a fast and efficient HyDR.
- hydrogen-based direct reduction;
- iron oxide;
- microstructure;
- spatial gradient;
- metallization

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