基于转底炉直接还原工艺的钒钛磁铁矿综合利用试验研究

通过大量试验研究,提出了＂钒钛磁铁矿转底炉直接还原—电炉深还原—含钒铁水提钒—含钛炉渣提钛＂工艺流程。铁、钒、钛元素回收率分别达到90.77%、43.82%和72.65%。通过试验室和工业试验研究,解决了钒钛磁铁矿直接还原金属化率低、电炉深还原钒还原率低、高硅铁水提钒、高镁铝含钛炉渣提钛等技术难题,获得了直接还原金属化率大于90%,电炉深还原钒还原率大于80%,钒渣提钒钒回收率大于65%,钛渣提钛钛回收率大于75%的良好效果,分别获得了符合电炉炼钢要求的低碳生铁、符合YB/T5304-2006要求的片状V2O5和达到PTA121质量要求的钛白产品。

Study on applied technology of vanadium titanium magnetite based on rotary hearth furnace direct reduction process

Through a series of experiments the process of"rotary harth furnace direct reduction-deep reduction electric arc furnace-extracting vanadium from vanadium bearing slag and extracting titanium from titanium bearing slag"has been developed.The recovery of Fe,V and Ti reached 90.77 %,43.82 % and 72.65 % respectively.With the study on the laboratory experiments and industrial tests,the technical bottlenecks such as low metallization rate of vanadium-titanium magnetite in direct reduction process,low reduction rate of vanadium in EAF,vanadium-recovery of hot metal with high silicon content,titanium-recovery of high Mg and Al slag with titanium,and so on,have been solved.As a result,the metallization rate of vanadium-titanium magnetite in direct reduction process reached over 90 %,reduction rate of vanadium in EAF deep reduction process was over 80 %,vanadium-recovery rate in slag was up to over 65 %,and titan-ium-recovery rate in slag went to over 75 %.Furthermore,low-carbon pig iron with good quality for EAF steelmaking has also been gotten.Otherwise,V2O5 flake and titanium products can meet the requirements of YB/T5304-2006 and PTA121 respectively.