摘要
我国钒钛磁铁矿资源储量丰富,但传统的高炉—转炉工艺在处理该矿时存在工艺流程长、资源综合利用效果差、能耗高、环境污染大等问题。气基竖炉直接还原—电炉熔分工艺为钒钛磁铁矿的清洁高效利用提供了新途径。本文通过进行钒钛球团矿气基竖炉直接还原投笼试验,研究实际生产过程中钒钛球团矿的直接还原情况及球团品质,并提出相应改善措施。结果表明:钒钛球团矿的抗压强度是影响气基竖炉生产的因素之一,其较高的低温还原粉化率和还原膨胀率,也是导致直接还原铁(DRI)粉化严重、外观形貌差的重要因素,这成为气基竖炉生产的限制性环节;由于钒钛球团矿的特殊矿物组成,其还原性较差,生产DRI的金属化率偏低;通过提高气基竖炉进口温度和改善还原气氛等措施调整气基竖炉的操作制度,可使得DRI的金属化率有所提升。投笼试验为改善钒钛球团矿的冶金性能提供了方向,未来应着重优化竖炉操作制度,进一步提高还原效率。
China has abundant vanadium titanomagnetite resources,but the traditional blast furnace-converter process has such problems as long process flow,poor comprehensive utilization effect of resources,high energy consumption and large environmental pollution.The gas-based shaft furnace direct reduction-electric furnace melting process provides a new way for the clean and efficient utilization of vanadium titanomagnetite.Direct reduction cage test for vanadium titanium pellet ore gas-based shaft furnace is conducted,the direct reduction status and pellet quality of vanadium titanium pellet ore in actual production are researched,and the corresponding improvement measures are proposed.The results show that the compressive strength of vanadium-titanium pellets is one of the factors affecting the production of gas-based shaft furnaces,and its high low-temperature reduction pulverization rate and reduction expansion rate are also important factors leading to serious pulverization and poor appearance and morphology of direct reduced iron(DRI),which has become a limiting link in the production of gas-based shaft furnaces.Due to the special mineral composition of vanadium-titanium pellets,its reducibility is poor,and the metallization rate of DRI production is low.By adjusting the operating system of the gas-based shaft furnace by increasing the inlet temperature of the gas-based shaft furnace and improving the reducing atmosphere,the metallization rate of the DRI can be improved.The cage test provides a direction for improving the metallurgical properties of vanadium-titanium pellets,and the operation system of the shaft furnace should be optimized in the future to further improve the reduction efficiency.
作者
王海涛
李晓兵
吕志敏
曹建学
秦愉
WANG Haitao;LI Xiaobing;L Zhimin;CAO Jianxue;QIN Yu(HBIS Group Zhangxuan Technology Co.,Ltd.,Zhangjiakou 075100,Hebei,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《烧结球团》
北大核心
2025年第3期87-93,共7页
Sintering and Pelletizing
基金
河北省战略性技术专项(23314601L)。
关键词
钒钛球团矿
气基竖炉
低温还原粉化
还原膨胀
金属化率
vanadium titanium pellet ore
gas-based shaft furnace
low-temperature reduction pulverization
reduction expansion
metallization rate
作者简介
王海涛(1982-),男,高级工程师,从事气基竖炉生产与技术方面的研究工作;通信作者:李晓兵(1985-),男,博士研究生,正高级工程师,从事气基直接还原、烧结球团技术管理工作。
