摘要
采用烧结杯试验模拟实际烧结工艺条件,对褐铁矿质量分数42%的铁矿粉进行烧结,制备得到不同粒级的烧结矿,并采用矿相显微镜分析了烧结矿的微观结构特征。结果表明,混合矿中大于5 mm矿粉颗粒产率达到25.23%,制粒性能较差,导致小粒径烧结矿增多;随着烧结矿粒度由40 mm变小至5~12 mm,烧结矿黏结相质量分数由59.10%降至23.19%,铁酸钙形貌由针状向片状、团块状转变,其质量分数由39.43%降至17.26%,烧结矿微观结构由磁铁矿与铁酸钙的熔蚀交织结构转变为赤铁矿、磁铁矿和黏结相的粒状结构,磁铁矿晶粒由自形⁃半自形变为他形晶,晶粒间及晶粒中的微孔增多,呈现“多孔薄壁”结构,烧结矿强度性能变差。
In order to investigate the microstructure and mineral composition of sintered limonite(42%in mass fraction)within different size fraction,a sintering pot test was used to simulate the actual sintering process conditions.Thereby,the sintered ore with different particle sizes were prepared,and then mineralogical microscope was used to analyze its microstructure characteristics.The results show that if the mixed ore has the powdered ore with size larger than 5 mm in a mass fraction of 25.23%,the finally sintered ore with small particle size increases,presenting a poor pelletizing performance.As the sintered ore has its particle size reduced from 40 mm to a range of 5-12 mm,the bonding phase therein is in a mass fraction decreasing from 59.10%to 23.19%,and the calcium ferrite has its morphology converting from being acicular to flaky and agglomerated,and its mass fraction decreases from 39.43%to 17.26%.It is found that the sintered ore has converted from the structure with magnetite interwoven with calcium ferrite to granular structure composed of hematite,magnetite and bonding phase.The euhedral to subhedral magnetite grains are transformed to be anhedral,and the number of micropores between and within the grains increases,presenting a“porous and thin⁃walled”structure,resulting in worse performance in the strength of the sintered ore.
作者
张国成
柴轶凡
李红霞
贾倩南
罗果萍
雍胜利
ZHANG Guocheng;CHAI Yifan;LI Hongxia;JIA Qiannan;LUO Guoping;YONG Shengli(Department of Chemistry,Baotou Teachers’College,Baotou 014030,Inner Mongolia,China;School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)
出处
《矿冶工程》
北大核心
2025年第6期146-150,共5页
Mining and Metallurgical Engineering
基金
内蒙古自治区自然科学基金青年基金项目(2024QN05033)
内蒙古自治区自然科学基金面上项目(2022MS02005)。
关键词
烧结矿
粒度
显微结构
矿物组成
褐铁矿
黏结相
磁铁矿
赤铁矿
配矿
sintered ore
particle size
microstructure
mineral composition
limonite
bonding phase
magnetite
hematite
ore blending
