SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 47 ›› Issue (7): 39-47.DOI: 10.1016/j.cjche.2021.05.035

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Two-stage cyclic ammonium sulfate roasting and leaching of extracting vanadium and titanium from vanadium slag

Qing Lin, Guoquan Zhang, Kun Wang, Dongmei Luo, Siyang Tang, Hairong Yue   

  1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2021-02-26 Revised:2021-05-18 Online:2022-08-19 Published:2022-07-28
  • Contact: Guoquan Zhang,E-mail:zhanggq@scu.edu.cn
  • Supported by:
    This research was funded by National Natural Science Foundation of China (22008161). Thanks to the Engineering Experimental Teaching Center, School of Chemical Engineering, Sichuan University for the ICP-OES technical assistance.

Two-stage cyclic ammonium sulfate roasting and leaching of extracting vanadium and titanium from vanadium slag

Qing Lin, Guoquan Zhang, Kun Wang, Dongmei Luo, Siyang Tang, Hairong Yue   

  1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • 通讯作者: Guoquan Zhang,E-mail:zhanggq@scu.edu.cn
  • 基金资助:
    This research was funded by National Natural Science Foundation of China (22008161). Thanks to the Engineering Experimental Teaching Center, School of Chemical Engineering, Sichuan University for the ICP-OES technical assistance.

Abstract: Compared with traditional sodium or calcification roasting process for vanadium extraction from raw vanadium slag (V-slag), ammonium sulfate (AS) roasting could reduce about 470℃ roasting temperature and avoid Cl2, HCl, sodium-containing waste-water and waste gypsum discharging. To reduce the amount of AS added in vanadium extraction process, an efficient AS two-stage cyclic roasting and acid leaching process was proposed. The result of TG analysis indicates V-slag could be decomposed in 275-380℃ using AS roasting process. Using 2.03:1 total mass ratio of AS to V-slag, 90.86% V and 80.54% Ti could be extracted after 380℃ roasting for 30 min and 8% initial concentration of H2SO4 leaching at 70℃ for 100 min. XRD analysis indicates V-containing spinel phase in the 1st stage leaching residue would be efficiently decomposed by the cyclic two-stage roasting and leaching process. Furthermore, the valence of V(III) in raw V-slag was not changed after the 1st AS roasting stage, but a part of V(III) in the 1st leaching residue was oxidized to V(V) after 2nd roasting process.

Key words: Vanadium, Titanium, Roasting, Leaching

摘要: Compared with traditional sodium or calcification roasting process for vanadium extraction from raw vanadium slag (V-slag), ammonium sulfate (AS) roasting could reduce about 470℃ roasting temperature and avoid Cl2, HCl, sodium-containing waste-water and waste gypsum discharging. To reduce the amount of AS added in vanadium extraction process, an efficient AS two-stage cyclic roasting and acid leaching process was proposed. The result of TG analysis indicates V-slag could be decomposed in 275-380℃ using AS roasting process. Using 2.03:1 total mass ratio of AS to V-slag, 90.86% V and 80.54% Ti could be extracted after 380℃ roasting for 30 min and 8% initial concentration of H2SO4 leaching at 70℃ for 100 min. XRD analysis indicates V-containing spinel phase in the 1st stage leaching residue would be efficiently decomposed by the cyclic two-stage roasting and leaching process. Furthermore, the valence of V(III) in raw V-slag was not changed after the 1st AS roasting stage, but a part of V(III) in the 1st leaching residue was oxidized to V(V) after 2nd roasting process.

关键词: Vanadium, Titanium, Roasting, Leaching