超低碳钢RH混合喷吹Ar-CO_(2)冶金反应特性  

Metallurgical reaction behavior of Ar-CO_(2) mixed injection during RH refining process

作　　者：陈固军 杨江 李龙[3] 张敏[3] 何生平[2] CHEN Gu-jun;YANG Jiang;LI Long;ZHANG Min;HE Sheng-ping(School of Materials Science and Engineering,Yangtze Normal University,Chongqing 408100,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Institute of Material Engineering and Technology,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China)

机构地区：[1]长江师范学院材料科学与工程学院,重庆408100 [2]重庆大学材料科学与工程学院,重庆400044 [3]攀钢集团研究院有限公司材料工程技术研究所,四川攀枝花617000

出　　处：《钢铁》2022年第3期55-60,共6页Iron and Steel

基　　金：重庆市教委科学技术研究计划资助项目(KJQN201801413,KJQN202101404);重庆市自然科学基金资助项目(cstc2020jcyj-msxmX0177);国家自然科学基金资助项目(52104321)。

摘　　要：钢铁生产过程CO_(2)的资源化利用对中国“碳达峰,碳中和”目标的实现起着重要作用。氩气驱动的RH(ruhrstahl-heraeus)真空装置是超低碳钢精炼的关键设备,利用高真空下钢水循环流动可有效脱碳、脱气和去除夹杂物。由于真空条件下CO_(2)可直接与钢水中碳反应生成CO,在实现脱碳的同时可促进熔池搅拌。因此,尝试将Ar-CO_(2)混合气体作为提升气体引入超低碳钢RH脱碳过程。首先,针对CO_(2)在RH脱碳条件下的冶金反应行为,通过热力学理论分析了不同压力下Fe-C-O熔体与Ar-CO_(2)的反应特性。其次,搭建了Ar-CO_(2)混合气体作为RH提升气体的工业试验平台,通过工业性试验研究了超低碳钢RH脱碳过程混合喷吹Ar-CO_(2)对钢水脱碳、脱氮和温降的影响。Fe-C-O熔体与Ar-CO_(2)反应热力学表明,在低于100 kPa和超低碳条件下,Ar-CO_(2)混合气体中的CO_(2)仍可能与钢水中碳反应,从而促进RH脱碳和脱气。工业性试验表明,喷吹100%CO_(2)、50%Ar+50%CO_(2)和100%Ar炉次出站平均碳质量分数分别为0.00150%、0.00157%和0.00119%,因而混合喷吹Ar-CO_(2)并不会显著影响RH脱碳效率。同时,由于CO_(2)与钢水中碳反应十分有限,与喷吹100%Ar相比,喷吹100%CO_(2)和50%Ar+50%CO_(2)对RH脱氮效率和钢水温降没有明显影响。因此,超低碳钢RH脱碳时,完全可采用CO_(2)取代部分或全部氩气作为提升气体,尽管无法提高精炼效率,但仍具有显著的经济价值和环保优势。The resource utilization of CO_(2) during iron and steel production process makes a valuable contribution towards achieving the target of“carbon peak and carbon neutralization”.Ar-driven RH(ruhrstahl–heraeus)vacuum device is the key equipment for decarburization of ultra-low carbon steel,and the decarburization,degassing and inclusion removal can be effectively achieved by circulation flow of liquid steel in high vacuum.Since CO_(2) can directly react with carbon in the liquid steel to form CO,the decarburization can be realized and the bath stirring can be strengthened.Therefore,an attempt was made to introduce the Ar-CO_(2) mixed gas,as the lifting gas,into the RH decarburization process of ultra-low carbon steel.Firstly,the thermodynamic analysis between Fe-C-O melt and Ar-CO_(2) was carried out to study the metallurgical reaction behavior under different pressures in RH refining conditions.Then,an industrial test platform for taking Ar-CO_(2) mixed gas as RH lifting gas was built,and the effect of Ar-CO_(2) mixed injection on decarburization,denitrification and temperature drop of liquid steel during RH decarburization process of ultra-low carbon steel was investigated by industrial tests.Thermodynamic analysis between Fe-C-O melt and Ar-CO_(2) shows that CO_(2) can react with carbon in the molten steel under conditions of low atmospheric pressure and ultra-low carbon content,and RH decarburization and degassing can be accelerated.Industrial test indicates that the average carbon content in molten steel after RH treatment with 100%CO_(2),50%Ar+50%CO_(2) and 100%Ar injection are 0.00150%,0.00157%and 0.00119%,respectively,and thus the decarburization efficiency is not significantly affected by Ar-CO_(2) mixed injection.Meanwhile,compared with 100%Ar injection,100%CO_(2) and 50%Ar+50%CO_(2) injection have slight effect on RH denitrification efficiency and temperature drop of molten steel because the reaction of CO_(2) with carbon is quite limited.Therefore,CO_(2) can be used to partially or completely repl

关 键 词：RH 超低碳钢 CO_(2) 脱碳 脱氮 温降 

分 类 号：TF769[冶金工程—钢铁冶金]