投审稿入口

钒钛磁铁矿氢冶金-电炉熔分工艺研究与实践

Research and practice on hydrogen metallurgy-electric furnace melting separation process for vanadium-titanium magnetite

  • 摘要: 针对传统高炉-转炉流程冶炼钒钛磁铁矿存在钛资源回收率低、能耗高和碳排放高等突出问题,本文提出钒钛磁铁矿氢冶金-电炉熔分工艺路线,并开展基础研究及工业化试验。首先,以钒钛磁铁矿为原料制备氧化球团,之后通过氢基竖炉生产金属化球团,最后再经电炉熔分实现铁、钒、钛3种元素分离富集。基于此,本文系统探究了氧化球团、氢基还原和电炉熔分各工艺环节的最优控制条件。试验结果表明,在预热温度930 ℃、预热时间18 min条件下可获得符合氢基竖炉要求的氧化球团。提高还原温度与H2体积分数可显著提升还原性指数,高温和低H2体积分数则会加剧球团还原膨胀与黏结行为,低温还原粉化指数随H2体积分数呈先增后减趋势。电炉熔分在1 600 ℃、碳氧物质的量之比n(C)/n(O)为1∶1时渣铁分离效果最佳。工业化试验结果显示,含钒铁水中铁和钒平均收得率分别高于95%和90%,钛渣中钛平均收得率达到92%以上。该工艺实现了钒钛磁铁矿中铁、钒、钛3种有价组元的高效回收,为钒钛磁铁矿的高值化绿色利用提供了全新的技术方案与理论支撑。

     

    Abstract: To address the prominent problems of low titanium recovery, high energy consumption, and high carbon emissions in the traditional blast furnace basic oxygen furnace process for smelting vanadium-titanium magnetite, this paper proposed a process route of hydrogen metallurgy coupled with electric furnace melting separation for vanadium titanomagnetite, and conducted fundamental research and industrial trials. First, oxidized pellets were prepared using vanadium-titanium magnetite as raw material. Then these pellets were then used to produce metallized pellets via hydrogen based shaft furnace. Finally, electric furnace melting separation was applied to achieve the separation and enrichment of iron, vanadium, and titanium. Based on this approach, this study systematically investigated the optimal control conditions for each process step including oxidized pellet production, hydrogen based reduction, and electric furnace melting separation. Experimental results show that oxidized pellets meeting the requirements for hydrogen based shaft furnace can be obtained under preheating temperature of 930 ℃ and preheating time of 18 min. Increasing the reduction temperature and the H2 volume fraction significantly improves the reducibility index, while high temperature and low H2 volume concentration exacerbate pellet reduction swelling and sticking behavior. The low temperature reduction disintegration index first increases and then decreases with rising H2 volume fraction. The optimal slag metal separation for electric furnace melting separation is achieved at 1 600 ℃ with a C/O mole ratio n(C)/n(O) of 1∶1. Industrial trial results demonstrate that the average recovery rates of iron and vanadium in vanadium bearing hot metal exceed 95% and 90% respectively, and the average recovery rate of titanium in titanium slag reaches over 92%. This process achieves efficient recovery of the three valuable components of iron, vanadium, and titanium from vanadium-titanium magnetite, providing a new technical solution and theoretical support for the high value and green utilization of vanadium-titanium magnetite.

     

/

返回文章
返回