高炉富氢冶炼时渣-焦界面的润湿行为
Wetting behavior of slag-coke interface during hydrogen-rich smelting in blast furnace
兰臣臣 1邵建男 2张淑会 2卢建光 3刘然 2吕庆2
作者信息
- 1. 华北理工大学冶金与能源学院,河北唐山 063210;河北钢铁集团邯郸钢铁公司,河北邯郸 056000
- 2. 华北理工大学冶金与能源学院,河北唐山 063210
- 3. 河北钢铁集团邯郸钢铁公司,河北邯郸 056000
- 折叠
摘要
高炉富氢冶炼后焦炭的气化反应行为发生了较大变化,改变了渣-焦界面润湿性,这对高炉的透气、透液性有着重要影响.利用渣-焦界面接触角测定试验研究了不同条件对渣-焦界面润湿性的影响规律,利用激光共聚焦显微镜对焦炭表面的三维形貌进行表征并分析了渣-焦界面作用机理.结果表明,随着焦炭与H2O反应时间的增加,焦炭表面孔隙率逐渐增大,熔渣在焦炭表面的润湿驱动力增强,使熔渣与焦炭表面的接触角、界面张力和界面反应速率均随之降低,界面黏附功增大,熔渣在焦炭表面的润湿性改善.随着熔渣碱度的降低以及w(FeO)的增大,熔渣与焦炭表面的接触角和界面张力降低,界面反应速率和界面黏附功增加,熔渣在焦炭表面的润湿性改善;碱度在1.1～1.3变化时渣-焦界面润湿性变化幅度相对较小,w(FeO)由5％增加至10％时润湿性改善最明显;熔渣碱度降低以及w(FeO)增大均使熔渣对焦炭表面的溶蚀作用增加,使焦炭表面孔隙率和孔隙深度均明显增大,大气孔增多,熔渣对焦炭的黏附作用增强,不利于高炉生产.
Abstract
After hydrogen-rich smelting in blast furnaces,the gasification reaction behavior of coke has undergone significant changes,which directly affects the wettability of the slag-coke interface,and has a significant impact on the permeability and liquid permeability of blast furnaces.The influences of different conditions on the wettability of slag-coke interface were studied by measuring the contact angle of slag-coke interface.The three-dimensional mor-phologies of the coke surface were characterized using a laser confocal microscope and the mechanism of the slag-coke interface was analyzed.The results indicate that with the increase of reaction time between coke and H2O,the sur-face porosity of coke increases,enhancing the wetting driving force of slag on the coke surface,reducing the contact angle,interfacial surface tension,and interfacial reaction rate between slag and coke surface.The interfacial adhe-sion work increases,and the wettability of slag-coke on the coke surface improves.As the slag basicity decreases and w(FeO)increases,the contact angle and interfacial tension between the slag and coke surface decrease,the in-terfacial reaction rate and adhesion work increase,and the wettability of slag-coke improves.The change in wettabil-ity is relatively small when the basicity ranges from 1.1 to 1.3,and the improvement in wettability is most signifi-cant when w(FeO)increases from 5％to 10％.The decrease in basicity and the increase in w(FeO)both increase the corrosion effect of slag on the coke surface,resulting in a significant increase in surface porosity and pore depth of coke,increase in atmospheric pores,and enhanced adhesion effect of slag on coke,which is not conducive to blast furnace production.
关键词
焦炭/熔渣/润湿性/碱度/FeOKey words
coke/slag/wettability/basicity/FeO引用本文复制引用
基金项目
国家自然科学基金(52204344)
河北省自然科学基金(E2021209046)
唐山科技计划(21130209C)
中国博士后科学基金(2023M740957)
河北省博士后科研择优资助项目(B2023003004)
河北省教育厅科研项目青年拔尖人才项目(BJK2024055)
出版年
2024
NETL
NSTL
万方数据