Liu Mengxia, Jiang Tao, Wen Jing, Fu Zibi, Yu Tangxia, Yang Guangdong, Xia Sanyuan, Xiao Hao
School of Metallurgy, Northeastern University, Shenyang 110819, China.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China.
Materials (Basel). 2024 Dec 20;17(24):6223. doi: 10.3390/ma17246223.
Vanadium precipitation is the key step in producing vanadium products from vanadium solution. The sustainable development of the vanadium industry requires new environmentally friendly processes for vanadium precipitation. In this study, NaVO solution was pretreated with manganese salt to preliminarily separate the vanadium and sodium components. The product of vanadium extraction by manganese salt was dissolved by acid to produce manganese vanadate solution. After vanadium precipitation by hydrolysis, manganese removal, and calcination, the target product VO was obtained. Scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupled plasma emission spectrometry (ICP-OES), and atomic absorption spectrometry (AAS) were used to perform the characterization and analyses. The results showed that vanadium and manganese have a strong binding ability. The rate of vanadium extraction by manganese salt reached 99.75%, and the product of vanadium extraction by manganese salt was MnVO, with a sodium content of only 0.089%, confirming the effective separation of vanadium and sodium. The acid dissolution rate of the vanadium extraction product reached 99.95%, and the rate of vanadium precipitation by hydrolysis reached 97.87%. After manganese removal and calcination, the purity of the VO product reached 98.92%. In addition, the recyclability of manganese sulfate and ammonium sulfate was analyzed. The process reduced the production of ammonia-nitrogen wastewater, laying a foundation for researching new technologies for extracting vanadium from vanadium slag.
钒沉淀是从钒溶液中生产钒产品的关键步骤。钒工业的可持续发展需要新的环保型钒沉淀工艺。在本研究中，用锰盐对偏钒酸钠溶液进行预处理，以初步分离钒和钠成分。锰盐提钒产物经酸溶解得到钒酸锰溶液。经过水解沉钒、除锰和煅烧后，得到目标产物V₂O₅。采用扫描电子显微镜（SEM）、X射线衍射（XRD）、电感耦合等离子体发射光谱法（ICP - OES）和原子吸收光谱法（AAS）进行表征和分析。结果表明，钒与锰具有很强的结合能力。锰盐提钒率达到99.75%，锰盐提钒产物为MnVO₃，钠含量仅为0.089%，证实了钒和钠的有效分离。钒提取产物的酸溶率达到99.95%，水解沉钒率达到97.87%。经过除锰和煅烧后，V₂O₅产物的纯度达到98.92%。此外，还分析了硫酸锰和硫酸铵的可回收性。该工艺减少了氨氮废水的产生，为研究从钒渣中提取钒的新技术奠定了基础。
