摘要
本文研究了在铝热还原条件下含稀土镧的高炉渣在整个升温过程中的热履历行为。利用示差扫描同步热分析仪(TG-DSC)分别将实验室配制的加入铝粉与不加入铝粉的含稀土高炉渣在高纯氩气保护下,从室温以5℃/min升至1550℃,对比发现整个升温过程中还原反应集中在960℃~1010℃和1420℃~1550℃两个温度区间内。然后在高纯氩气气氛中将加入铝粉的含稀土高炉渣压块以5℃/min分别升温至1000℃和1550℃并保温30 min,利用X射线衍射仪(XRD)、场发射电子显微镜中的能谱扫描(EDS)和电子背散射衍射(EBSD)技术分析铝热还原高炉渣中稀土氧化物在整个升温过程中的热履历行为。结果表明,在低温阶段1000℃时只进行了部分还原反应,其还原产物主要为Al_(9)Si;而在高温阶段1550℃时还原反应可以分为两个阶段:第一阶段为SiO_(2)→Al_(9)Si→Si,第二阶段为CaO→CaSi_(2)、(Ca_(0.2)La_(0.8))Si_(2)。
The thermal history behavior of blast furnace slag containing rare earth lanthanum during the whole heating process under aluminothermic reduction conditions was studied.Using the differential scanning synchronous thermal analyzer(TG-DSC),the blast furnace slag containing rare earth added with aluminum powder and the blast furnace slag without aluminum powder prepared in the laboratory were respectively raised from room temperature to 1550℃at 5℃/min under the protection of high-purity argon.The comparison shows that the reduction reaction is concentrated in two temperature ranges of 960℃~1010℃and 1420℃~1550℃during the whole heating process.Then,in high-purity argon atmosphere,the briquettes containing rare earth blast furnace slag with aluminum powder are heated to 1000℃and 1550℃at 5℃/min respectively and kept for 30 min.The thermal history behavior of rare earth oxides in aluminothermic reduction blast furnace slag during the whole heating process is analyzed by using X-ray diffraction(XRD),energy spectrum scanning(EDS),and electron backscattering diffraction(EBSD)in a field emission electron microscope.The results showed that only a partial reduction reaction was carried out at 1000℃in the low temperature stage,and the main reduction product was Al9Si;In the high temperature stage,the reduction reaction can be divided into two stages at 1550℃:The first stage is SiO_(2)→Al_(9)Si→Si;The second stage is CaO→CaSi_(2)、(Ca_(0.2)La_(0.8))Si_(2).
作者
闵令磊
瞿伟
任慧平
智建国
嵇铖
王霄
张丽
邢磊
MIN Ling-lei;QU Wei;REN Hui-ping;ZHI Jian-guo;JI Cheng;WANG Xiao;ZHANG Li;XING Lei(School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of New Metal Material,Inner Mongolia University of Science and Technology,Baotou 014010,China;Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan 735100,China;Baotou Iron and Steel(Group)Co.,Ltd.,Baotou 014010,China)
出处
《稀土》
北大核心
2025年第1期89-98,共10页
Chinese Rare Earths
基金
国家重点研发计划“固废资源化”重点专项(2020YFC19091)
内蒙古自然科学基金项目(2021BS05012)
内蒙古自治区高等学校创新团队发展计划项目(NMGIRT2401)
关键词
含稀土高炉渣
铝热还原
升温过程
热履历行为
微观过程
blast furnace slag containing rare earth
aluminothermic reduction
temperature rise process
thermal history behavior
micro process
作者简介
闵令磊(1997-),男,安徽滁州人,硕士研究生,主要从事稀土二次资源再利用相关研究,E-mail:m1459349917@163.com;通信作者:瞿伟,副研究员,E-mail:qwandzls@126.com
