摘要
钢铁行业是碳排放的主要源头之一,发展球团技术是实现“双碳”目标的有效措施之一。球团还原膨胀过高会导致反应器透气性恶化,甚至引发生产事故。本文系统综述了铁矿球团还原膨胀的主要机理,包括物相转变引起的晶格膨胀、气体压力导致的铁层破裂、碳沉积引发的结构破坏、还原应力不均导致的裂纹以及新生铁的析出形态。研究表明,调控铁晶须的生成是抑制恶性膨胀的关键突破口,还原膨胀受预热焙烧制度、孔隙度、脉石组分及还原条件的显著影响。通过优化配矿、合理控制碱度、优化预热焙烧制度及限制有害元素摄入,可有效抑制铁矿球团还原膨胀。本研究为球团性能优化及低碳炼铁技术发展提供了理论依据与技术路径。
The iron and steel industry is one of the major source of carbon emissions,and advancing pellet technology is one of the effective measures to achieve the"dual-carbon"goals.Excessive reduction swelling of pellets can degrade reactor permeability and even leads to production accidents.This paper systematically reviews the primary mechanisms of reduction swelling in iron ore pellets,including lattice expansion from phase transformations,iron layer cracking due to gas pressure,structural damage induced by carbon deposition,cracking resulting from uneven reduction stresses,and the precipitation morphology of nascent iron.Studies have shown that regulating the formation of iron whiskers is a key breakthrough in inhibiting malignant expansion,while reduction swelling is significantly influenced by preheating/roasting parameters,porosity,gangue composition,and reduction conditions.Key measures to suppress pellet swelling involve optimizing ore blending,rational control of basicity,refining preheating/roasting processes,and restricting harmful element intake.It provides a theoretical foundations and technical pathways for optimizing pellet performance and advancing low-carbon ironmaking technologies.
作者
雷杰
原晨凯
匡朝晖
刘桐
李亚飞
王毅璠
龙红明
LEI Jie;YUAN Chenkai;KUANG Zhaohui;LIU Tong;LI Yafei;WANG Yifan;LONG Hongming(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Baogang Zhanjiang Steel Co.,Ltd.,Zhanjiang 524039,Guangdong,China;School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling,Maanshan 243002,Anhui,China)
出处
《中国冶金》
北大核心
2025年第11期1-15,共15页
China Metallurgy
基金
安徽省杰青资助项目(2208085J19)。
关键词
铁矿球团
还原膨胀
铁晶须
脉石组分
氢基竖炉
调控
iron ore pellets
reduction swelling
iron whisker
gangue composition
hydrogen-based shaft furnace
regulating
