碱金属K对焦炭反应性和反应后强度的影响  

Effect of alkali metal K on the reactivity and strength after reaction of coke

作　　者：索志远 高强健 赵克斌 徐维利 段福彬 王加林 Suo Zhiyuan;Gao Qiangjian;Zhao Kebin;Xu Weili;Duan Fubin;Wang Jialin(School of Metallurgy,Northeastern University,Shenyang 110819,China;Jianlong Xilin Iron&Steel Co.,Ltd.,Yichun 153032,China)

机构地区：[1]东北大学冶金学院,沈阳110819 [2]建龙西林钢铁有限公司,黑龙江伊春153032

出　　处：《材料与冶金学报》2025年第2期114-121,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(52074086);中冶长天科研开发基础研究基金资助项目(2024JCYJ04);中央高校基本科研业务专项资金资助项目(N2225039)。

摘　　要：为了研究碱金属K对焦炭反应性(CRI)和反应后强度(CSR)的影响,采用浸碱法对3种典型焦炭(焦炭A,B,C)进行处理,测试其反应性和反应后强度,并结合扫描电镜(SEM)和能谱分析(EDS)表征了其微观结构的演变.结果表明:碱金属K显著促进了焦炭的气化反应,使其反应性增加和反应后强度下降;以焦炭A为例,浸K后其反应性从19.97%增至30.70%,增幅达10.73%,反应后强度从69.80%降至56.55%,降幅为13.25%;浸K焦炭在气化反应后孔隙结构更加疏松,表面裂纹增多,且孔隙中富集大量K;碱金属K通过催化气化反应不仅对焦炭性能起到劣化作用,还改变了焦炭的微观结构,进一步降低了焦炭反应后强度.本研究结果为高炉生产中优化焦炭质量的评价体系提供了理论依据,同时强调了在高碱金属负荷条件下焦炭抗碱性能的重要性,这对提升高炉稳定性及降低生产成本具有重要意义.To investigate the influence of alkali metal K on the reactivity(CRI)and post-reaction strength(CSR)of coke,three typical coals(coke A,B,and C)were treated by the alkali leaching method.Their reactivity and post-reaction strength were tested,and the evolution of their microstructure was characterized by scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that alkali metal K significantly promotes the gasification reaction of coke,increasing its reactivity and reducing its post-reaction strength.Taking coke A as an example,after K leaching its reactivity increases from 19.97%to 30.70%,with an increase of 10.73%,and its post-reaction strength decreases from 69.80%to 56.55%,with a decrease of 13.25%.The pore structure of K-leached coke became looser after the gasification reaction,with an increase in surface cracks and a large amount of K enriched in the pores.Alkali metal K not only deteriorates the performance of coke by catalyzing the gasification reaction but also changes the microstructure of coke,further reducing its post-reaction strength.This study provides a theoretical basis for optimizing the evaluation system of coke quality in blast furnace production and emphasizes the importance of coke′s alkali resistance under high alkali metal load conditions,which is of great significance for improving the stability of blast furnaces and reducing production costs.

关 键 词：焦炭 碱金属K 反应性 反应后强度 

分 类 号：TF526.1[冶金工程—钢铁冶金]