摘要:
为实现钒钛磁铁矿低温还原、铁粉高值化利用及富钒钛料清洁利用,提出了磨选除杂—矿、煤、钠盐混合—直接还原—磨选—二次还原铁粉—钠法提钒的新工艺。结果表明,对钒钛磁铁精矿进行磨选处理,能够有效去除杂质,为后续生产优质铁粉和高效提钒打下基础。钠盐的加入可以大幅降低直接还原温度,改善还原效果。一次还原铁粉经磨选—二次还原,得到品位为98.72%的二次还原铁粉,其化学成分和工艺性能全面达到行业一级铁粉标准;富钒钛料经钠化氧化焙烧—水浸—酸性铵盐沉钒—煅烧脱氨可获得纯度98.12%的V2O5产品,浸出渣经稀硫酸浸出可获得TiO2品位49.61%的富钛料。在所选条件下,从磨选除杂后的钒钛磁铁矿精矿到二次还原铁粉、V2O5产品和富钛料的铁、钒、钛的总回收率分别为90.75%、82.71%、89.63%。
Abstract:
In order to achieve low-temperature reduction of vanadium-titanium magnetite,high-value utilization of iron powder,and clean utilization of vanadium-rich titanium materials,a new process which includes grinding and removal of impurities,ore,coal,sodium salt mixed to make agglomerates,direct reduction-grinding,secondary reduction of iron powder,sodium roasting to extract vanadium for efficient and comprehensive utilization of vanadium-titanium magnetite was proposed.The results show that the grinding treatment of vanadium-titanium magnetite concentrate can effectively remove impurities,laying the foundation for the subsequent production of high-quality iron powder and efficient vanadium extraction.The addition of sodium salt can greatly reduce the direct reduction temperature and improve the reduction effect.After grinding and selecting the primary reduced iron powder and secondary reduction,the reduced iron with 98.72% grade can be obtained,and its chemical compositions and process performances reach the industrial first-level iron powder standard.V2O5 with 98.12% of purity can be obtained from the vanadium titanium enriched material by sodium oxidation roasting-water leaching-acid ammonium salt vanadium precipitation-calcination and deamination.A titanium-rich material with a TiO2 grade of 49.61% can be obtained from the leaching residue through dilute sulfuric acid leaching.Under the selected conditions,the total recovery rates of Fe,V2O5 and TiO2 from vanadium-titanium magnetite concentrates to secondary reduced iron powder,V2O5 products and titanium-rich materials are 90.75%,82.71% and 89.63%,respectively.
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