Vanadium Transitions during Roasting-Leaching Process of Vanadium Extraction from Stone Coal

Minerals

Yimin Zhang¹  Licai Chen²  Shaoxian Song²  Shenxu Bao²  Yunliang Zhao²  Hao Yi² 

[1] School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China;

关键词: vanadium;    transitions;    roasting;    leaching;    stone coal;   

DOI  :  10.3390/min8020063

来源: DOAJ

【 摘 要 】

The vanadium occurrence in stone coal, water leaching, and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis, and the vanadium transitions during roasting-leaching of stone coal were revealed. In the roasting process, vanadium-bearing muscovite is converted to K-Na-feldspar, accompanying the liberation of vanadium. Most liberated vanadium reacts with sodium salt to generate water-soluble sodium vanadate, some reacts with calcite in stone coal to form water-insoluble calcium vanadate, and other liberated vanadium exists as free vanadium oxide. However, for coarse muscovite grains, the reaction of muscovite converted to K-Na-feldspar only occurs at the outer margin of muscovite grains, and the vanadium in the interior of muscovite grains is not liberated. During water leaching, the sodium vanadate is leached out. The calcium vanadate and free vanadium oxide are dissolved out in the process of acid leaching, and the vanadium, presenting in muscovite grains surrounded by K-Na-feldspar, still remains in the acid leaching residue. Two suggestions, including optimization of grinding-classification process and adopting microwave roasting, were proposed for improving vanadium recovery according to the vanadium transition rules.

【 授权许可】

Unknown