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用于钢铁制造的金属化颗粒的制备,用不同冷却速率的冷却减少

Guanwen Luo¹, Zhiwei Peng¹, Kangle Gao¹

¹School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.

Materials (Basel, Switzerland)

|September 14, 2024

概括

使用热铁矿石颗粒热量直接制造钢铁可减少二氧化碳. 在降解过程中冷却速度较慢会增强铁的金属化,但会降低颗粒强度,最佳强度在3.7°C/分钟.

科学领域:

金工程金工程金工程
材料科学材料科学材料科学

背景情况:

直接钢铁制造为传统方法提供了一个可持续的替代方案.
利用来自铁矿石颗粒冷却的废热可以提高工艺效率.

研究的目的:

调查冷却速度对金属化铁矿石颗粒性能的影响.
为直接钢铁制造应用优化颗粒的性能.

主要方法:

铁矿石颗粒在受控冷却过程中使用 (H2) 来减少.
对热烤颗粒应用了可变的冷却速度 (2.05.2°C/分钟).
分析了包括总铁含量,减少程度,金属化程度,压力强度,多孔性和微观结构在内的关键颗粒性质.

主要成果:

降低冷却速度从5.2到2.0°C/分钟增加了总铁含量 (74.084.9重%),减少程度 (5293.4%),以及铁金属化 (31.189.2%).
颗粒的压力强度最初在3.7°C/分钟时上升到2436N/p,然后在2.0°C/分钟时下降到841N/p.
较慢的冷却促进了Fe2O3减少到Fe,增加了孔隙性 (23.954.3%),并导致球形/网状金属铁形态.

结论:

冷却速度显著影响铁矿石颗粒的减少,金属化和强度.
在每分钟3.7°C的冷却速度下,可以达到最佳的金属化和强度,从而产生具有高降解性和特定微观结构特性的颗粒.
该工艺提供了一种无二氧化碳的方法,用于使用废热生产金属化颗粒.

关键词:

冷却速度的冷却速度减少的减少.铁矿石颗粒铁矿石颗粒金属铁颗粒的金属铁颗粒.金属化的程度.多孔性多孔性

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