Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (8): 2208-2213.doi: 10.1016/j.cjche.2020.03.038

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

A novel method for extracting vanadium by low temperature sodium roasting from converter vanadium slag

Rongrui Deng1,2, Hao Xiao1,2, Zhaoming Xie1,2, Zuohua Liu1,2, Qiang Yu1,2, Geng Chen1,2, Changyuan Tao1,2   

  1. 1 College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
    2 Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, Chongqing 400044, China
  • Received:2019-06-21 Revised:2020-02-14 Online:2020-08-28 Published:2020-09-19
  • Contact: Zhaoming Xie
  • Supported by:
    This work was supported by the National Key Research and Development Program of China, China (2017YFB0603105) and the Key Program of Key Program of National Natural Science Foundation of China, China (21636004).

Abstract: Long-term high temperature in conventional vanadium extraction process would cause particles to be sintered and wrapped, thus reducing extraction efficiency of vanadium. Based on the purpose of directional conversion and process intensification, this work proposed a combination of low temperature sodium roasting and high efficiency selective oxidation leaching in vanadium extraction. The investigation of the reaction mechanism suggested that the structure of vanadium slag was changed by roasting, which also caused the fracture of spinel. The addition of MnO2 promoted the directional oxidation of low-valent vanadium into high valence. It also found that Na2S2O8 could oxidize low-valent vanadium effectively in leaching. The leaching efficiency of vanadium reached 87.74% under the optimum conditions, including a roasting temperature of 650 ℃, a roasting time of 2.0 h, a molar ratio of sodium-to-vanadium of 0.6, a MnO2 (roasting additive) dosage of 5 wt% and a Na2S2O8 (leaching oxidant) dosage of 5 wt%. This percentage is 7.18% higher than that of direct roasting-andleaching under the same conditions.

Key words: Directional conversion, Oxidation leaching, Process intensification, Vanadium slag