Wen Jing, Liu Xinyu, Yuan Shuai, Yu Tangxia, Zhang Lan, Jiang Tao, Li Jingwei
School of Metallurgy, Northeastern University, Shenyang 110819, China.
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2025 Feb 14;18(4):844. doi: 10.3390/ma18040844.
The difficulty of separating iron and manganese is a bottleneck issue in the traditional utilization process of iron manganese ore (Fe-Mn ore). In this work, ammonium polyvanadate (APV), an intermediate product in the vanadium industry, was introduced innovatively to convert the manganese-containing phase in Fe-Mn ore into manganese pyrovanadate (MnVO) and iron and manganese were then separated efficiently through the acid leaching process. The migration of manganese, iron, and vanadium were systematically studied through XRD, SEM, and leaching experiments. Results show that during the mixed roasting process of Fe-Mn ore and APV, VO, the decomposition product of APV, reacts with the decomposition product of manganese minerals in Fe-Mn ore, MnO, to produce the target product, acid-soluble MnVO. Iron and silicon exist in the form of FeO and SiO like in Fe-Mn ore. After the two-step leaching process of the sample roasted at 850 °C with (MnO)/(VO) of 2.25, the leaching ratios of manganese, iron and vanadium are 84.57%, 0.046%, and 4.68%, respectively, achieving the efficient separation of manganese with iron and vanadium. MnCO obtained by carbonization and precipitation from the manganese-containing leaching solution can be used as an intermediate product of manganese metallurgy or manganese chemical industry. APV obtained by alkaline leaching and precipitation from the vanadium- and iron-containing tailing can be recycled into the roasting system as the roasting additive. The TFe content in the iron-containing tailing reaches 57.21 wt.%, which meets the requirement of iron concentrate. More than 99 wt.% of vanadium from the additive APV can be recovered and recycled back into the Fe-Mn ore utilization process by APV recycling and wastewater recycling, making the Fe-Mn ore utilization with APV roasting a green process.
铁锰矿（Fe-Mn矿）传统利用过程中，铁和锰的分离困难是一个瓶颈问题。在本工作中，创新性地引入了钒工业的中间产物偏钒酸铵（APV），将Fe-Mn矿中的含锰相转化为焦钒酸锰（MnVO），然后通过酸浸过程实现铁和锰的高效分离。通过XRD、SEM和浸出实验系统研究了锰、铁和钒的迁移情况。结果表明，在Fe-Mn矿与APV的混合焙烧过程中，APV的分解产物VO与Fe-Mn矿中锰矿物的分解产物MnO反应，生成目标产物酸溶性MnVO。铁和硅以FeO和SiO的形式存在，如同在Fe-Mn矿中一样。在850℃下焙烧且（MnO）/（VO）为2.25的样品经过两步浸出过程后，锰、铁和钒的浸出率分别为84.57%、0.046%和4.68%，实现了锰与铁和钒的高效分离。通过碳化和沉淀从含锰浸出液中获得的MnCO可作为锰冶金或锰化工的中间产物。通过碱浸和沉淀从含钒和铁的尾矿中获得的APV可作为焙烧添加剂循环回焙烧系统。含铁尾矿中的TFe含量达到57.21 wt.%，满足铁精矿的要求。通过APV循环和废水循环，添加剂APV中99 wt.%以上的钒可以被回收并循环回Fe-Mn矿利用过程，使得采用APV焙烧的Fe-Mn矿利用成为一个绿色过程。
