温度对球团矿氢还原行为的影响

doi:10.11901/1005.3093.2025.039

材料研究学报

2025, Vol. 39

Issue (12): 918-926 DOI: 10.11901/1005.3093.2025.039

研究论文

本期目录 | 过刊浏览

温度对球团矿氢还原行为的影响

白立伟¹^,², 刘炳南³^,⁴, 佟可蕙⁵, 张雪²(

)

^1.东北大学材料科学与工程学院沈阳 110819
^2.中国科学院金属研究所沈阳 110016
^3.海洋装备金属材料及其应用全国重点实验室鞍山 114009
^4.鞍钢集团钢铁研究院鞍山 114009
^5.鞍钢集团工程技术有限公司鞍山 114021

Effect of Temperature on Reduction Behavior of Iron Ore Pellets with Hydrogen

BAI Liwei¹^,², LIU Bingnan³^,⁴, TONG Kehui⁵, ZHANG Xue²(

)

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.State Key Laboratory of Metallic Materials for Marine Equipment and Applications, Anshan 114009, China
^4.ANSTEEL Iron & Steel Research Institute, Anshan 114009, China
^5.ANSTEEL Engineering Technology Corporation Limited, Anshan 114021, China

引用本文:

白立伟, 刘炳南, 佟可蕙, 张雪. 温度对球团矿氢还原行为的影响[J]. 材料研究学报, 2025, 39(12): 918-926.
Liwei BAI, Bingnan LIU, Kehui TONG, Xue ZHANG. Effect of Temperature on Reduction Behavior of Iron Ore Pellets with Hydrogen[J]. Chinese Journal of Materials Research, 2025, 39(12): 918-926.

全文: PDF(20726 KB) HTML

摘要:

在600~900 ℃对球团矿进行纯氢还原并分析其还原热力学和组织结构演化，揭示温度对直接还原炼铁行为的微观作用机制。结果表明，在热力学上，球团矿在Fe₂O₃→Fe₃O₄反应阶段对还原剂H₂的扩散迁至和对反应产物H₂O的扩散迁离的需求远低于Fe₃O₄→FeO和FeO→Fe反应阶段；提高温度可增大Fe₃O₄→FeO和FeO→Fe反应的热力学驱动力，提高球团矿的还原程度；随着温度的升高球团矿内部孔隙的数量和尺寸变大，缩短了还原反应的扩散传质路径、增大了扩散驱动力；随着温度进一步由800 ℃升高到900 ℃，Fe的形核生长呈现出不同的形态，还原效率的提高较为有限。

关键词 ：材料科学其它学科, 氢基直接还原, 球团矿, 微观形貌, 孔隙率

Abstract：

Although the direct reduction of iron ore with hydrogen is regared as an important technological approach for the steel industry to achieve low-carbon development, it shows great potential in reducing energy consumption and enhancing efficiency. However, its application in industry is limited by certain deficiencies in its process theory in the presence. The structural evolution of iron ore pellets during the hydrogen metallurgy process can be changed by adjusting process parameters such as ironmaking temperature, which will impact the reduction behavior as a whole. To uncover the microscopic mechanisms related with the effect of temperature on the process of direct reduction iron-making, therefore, the pure hydrogen reduction of iron ore pellets at 600 ^oC to 900 ^oC was examined in terms of the reduction thermodynamics and microstructural evolution of pellets. The findings reveal that, thermodynamically, the Fe₂O₃→Fe₃O₄ reaction stage required substantially lower demand for the diffusion to of the reducing agent H₂ and the diffusion away of the reaction product H₂O in contrast to the Fe₃O₄→FeO and FeO→Fe reaction stages. Increasing the temperature can improve the overall reduction degree of the pellets by strengthening the thermodynamic driving force for the Fe₃O₄→FeO and FeO→Fe stages. The number and size of pores in the pellets increase with temperature, which improves the diffusion driving force and shortens the diffusion channel for the reduction reaction. The nucleation and growth of Fe exhibit distinct characteristics as the temperature increases from 800 ^oC to 900 ^oC, but the reduction efficiency shows only a slight enhancement. This work is important for optimizing the process of hydrogen direct reduction of iron ore pellets, from a theoretical and practical standpoint.

Key words： other disciplines of the materials science hydrogen-based direct reduction pelletized ore microstructure porosity

收稿日期: 2025-01-16

ZTFLH:

TF554

基金资助:国家自然科学基金区域创新发展联合基金(U23A20608)

通讯作者: 张雪，研究员，xuezhang@imr.ac.cn，研究方向为临氢环境高温反应机制、高温腐蚀与防护

Corresponding author: ZHANG Xue, Tel: 15140233321, E-mail: xuezhang@imr.ac.cn

作者简介: 白立伟，女，2000年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2025.039 或 https://www.cjmr.org/CN/Y2025/V39/I12/918

图1 球团矿还原实验装置

图2 在不同温度下铁氧化物发生还原反应的临界水/氢分压比和在氢气中还原10 min球团矿的还原程度

图3 球团矿在600 ℃纯氢气氛中还原10 min的截面形貌

图4 球团矿在700 ℃纯氢气氛中还原10 min的截面形貌

图5 球团矿在800 ℃纯氢气氛中还原10 min的截面形貌和EDS结果

图6 球团矿在900 ℃纯氢气氛中还原10 min的截面形貌和EDS结果

图7 球团矿中心区域在900 ℃纯氢气氛中还原10 min的EBSD图

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