摘要
优质球团精粉短缺是制约现阶段“烧结转球团”、提高高炉球团矿入炉比例、促进高炉铁前降碳的瓶颈问题之一,因而拓宽球团原料来源具有重要意义。针对巴西赤铁精粉(PFC1)研究了其基本性质和矿物学特征,并揭示了在链箅机-回转窑工艺以磁铁矿为主和带式焙烧机工艺以赤铁矿为主2种典型配矿结构下PFC1使用比例,以及对混合精矿造球性能、球团焙烧特性和高温冶金性能的影响规律。结果表明,在链箅机-回转窑工艺以磁铁矿为主(磁铁矿比例70%~100%)的配矿结构下,用10%PFC1取代磁铁精矿时,改善了混合精矿的成球性,制备出了力学强度良好的焙烧球团,同时球团还原性、还原膨胀指数等高温冶金性能也得到改善;在带式焙烧机工艺以赤铁矿为主(赤铁矿比例40%~75%)的配矿结构下,添加10%~20%PFC1时,生球强度良好且热稳定性有所提升,同时球团焙烧特性和还原膨胀性能有所改善,而对球团还原性和低温还原粉化性能有一定不利影响,但均能达到入炉要求。对于链箅机-回转窑工艺和带式焙烧机工艺,PFC1取代磁铁矿和赤铁矿的比例可达10%~20%。研究结果为拓宽球团原料来源、指导钢厂应用PFC1赤铁精矿提供了重要参考和指导。
The lack of high-quality iron ore is one of the key problems restricting the"sintering to pelletizing",increasing the proportion of pellets in the blast furnace and promoting carbon emission reduction before the blast furnace ironmaking.Therefore,it is of great significance to broaden the source of pelletizing materials.The basic properties and mineralogical characteristics of Brazilian hematite concentrate(PFC1)were studied,and it revealed effects on pelletizing performance,firing characteristics and high-temperature metallurgical performance of mixed concentrate when the proportion of PFC1 was changed in the two typical ore blending structures of grate-kiln process mainly magnetite and straight grate process mainly hematite.The results show that in the grate-kiln process of mainly magnetite(70%-100%magnetite)ore composition,replacing the magnetite concentrate with 10%PFC1 can improve the pelletizing properties of the mixed concentrate,the fired pellets with good mechanical strength can be prepared,and the high-temperature metallurgical performance including reduction degree index and reduction expansion index are also improved.In the straight grate process of mainly hematite(40%-75%hematite)ore composition,when 10%-20%PFC1 is adding,the thermal stability of mixed concentrate green pellets is improved,the strength of the green pellets is good,the firing characteristics and reduction swelling index of pellet are improved,however,it has some adverse effects on reduction degree index and low temperature reduction degradation index of pellets,but all of the indexes can still meet the requirements of furnace.The proportion of magnetite and hematite replaced by PFC1 can reach 10%-20%for the grate-kiln process and straight grate process,and the performance of the prepared pellets is good meanwhile.The results provide important reference and guidance for expanding the raw material source of pelletizing and guiding the application of PFC1 hematite.
作者
朱德庆
杨钰萍
宋清诗
王伟
潘建
杨聪聪
郭正启
李思唯
ZHU Deqing;YANG Yuping;SONG Qingshi;WANG Wei;PAN Jian;YANG Congcong;GUO Zhengqi;LI Siwei(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Vale Metals(Shanghai)Co.,Ltd.,Shanghai 200070,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2024年第6期44-54,73,共12页
China Metallurgy
基金
国家自然科学基金资助项目(52004339)
中国宝武低碳冶金创新基金资助项目(BWLCF202216)
中冶北方“181计划”重大研发项目
