还原钒钛磁铁矿磁选尾渣钒钛分离试验

Experiment on separating vanadium and titanium from magnetic separation tailings of reduced vanadium titanium magnetite

针对攀枝花米易某选厂钒钛磁铁矿的特点,拟采用新工艺实现钒钛磁铁矿中Fe、V、Ti高效分离和回收利用。主要工艺过程为钒钛磁铁矿采用氢气还原制备得到还原后的钒钛磁铁矿,经细磨和湿式磁选分离金属铁粉,实现Fe和V、Ti的分离;在固相条件下,经氢气还原后钒钛磁铁矿中的V、Ti大部分富集在非磁性的尾渣中。以还原钒钛磁铁矿磁选分离金属铁后的尾渣为对象,结合湿法冶金和选矿工艺实现磁选尾渣的钒钛分离,具体开展了钠化氧化焙烧的工艺分离提取钒和摇床重选提钒尾渣富集钛试验研究。试验表明,该工艺可以有效地分离提取V和Ti。在磁选尾渣加入质量分数为7%的Na_(2)CO_(3)添加剂,850℃温度条件下进行钠化氧化焙烧-水浸,钒收率最高可达84.12%;采用3级循环水浸,可制得钒质量浓度为22 g/L的钒溶液,经酸性铵盐沉钒工艺制得的V_(2)O_(5)纯度(质量分数)为98.30%。通过控制摇床冲水量5 L/min可得到产率为41.62%,TiO_(2)品位为75.18%含钛精矿钛收率可达78.54%。磁选还原钒钛磁铁矿分离可提取金属铁粉,实现了铁的回收。提出的钒钛磁铁矿综合利用工艺方案有望实现攀西钒钛磁铁矿铁、钒、钛资源综合利用,该方案可进一步开展更大规模试验研究。

Based on the characteristics of a vanadium titanium magnetite ore dressing plant in Miyi County,Panzhihua,a new process is proposed to achieve efficient separation and recycling of Fe,V,and Ti in vanadium titanium magnetite.The main process involves preparing reduced vanadium titanium magnetite by hydrogen reduction,and separating metal iron powder through fine grinding and wet magnetic separation to achieve the separation of Fe,V,and Ti.Under solid-phase conditions,most of the V and Ti in vanadium titanium magnetite are enriched in nonmagnetic tailings after hydrogen reduction.Taking the tailings obtained from magnetic separation of metallic iron from reduced vanadium titanium magnetite as the object,combined with hydrometallurgy and beneficiation processes,the separation of vanadium and titanium from magnetic separation tailings was achieved.Specifically,experimental research was conducted on the separation and extraction of vanadium by sodium oxidation roasting process and the enrichment of titanium in vanadium tailings by shaking table gravity separation.The experiment shows that this process can effectively separate and extract vanadium and titanium.Adding 7%Na_(2)CO_(3) additive to the magnetic separation tailings,the highest yield of sodium oxidation roasting water immersion vanadium can reach 84.12%at 850℃.A vanadium solution with a concentration of 22 g/L of vanadium element can be prepared by using a 3-stage circulating water immersion method.The purity of V_(2)O_(5) is 98.30%by acid ammonium salt vanadium precipitation process.By controlling the water flow rate of the shaking table to 5 L/min,a yield of 41.62%can be obtained,with a TiO_(2) grade of 75.18%containing titanium concentrate and a titanium yield of 78.54%.Magnetic separation reduction of vanadium titanium magnetite separates extractable metallic iron powder,achieving iron recovery.The comprehensive utilization process scheme of vanadium titanium magnetite proposed is expected to achieve the comprehensive utilization of iron,vanadium,and titanium resources in Panxi vanadium titanium magnetite.This scheme can further carry out larger scale experimental research.