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Volume 44 Number 6 Volume 45 Number 1

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Research articles

ScienceAsia 45(2019): 43-49 |doi: 10.2306/scienceasia1513-1874.2019.45.043

Effects of different alkalis on the behaviour of vanadium loss in the pretreatment of vanadium-bearing acid leaching solution

Qiaoqiao Zhenga,b, Yimin Zhanga,b,c,d,*, Shenxu Baoa,b, Jing Huangc,d, Guobin Zhanga,b

ABSTRACT:     This study examined the effect of different pretreating agents on vanadium loss from vanadium-bearing shale. Acid leaching solutions with added Ca(OH)2, CaCO3, NaOH, Na2CO3, and ammonia solution were evaluated. The pH of the acid leaching solution was adjusted to 2.0 to reduce vanadium loss and allow efficient removal of impurities, providing a high vanadium extraction efficiency. Ca(OH)2 was the most effective neutralizer and its use resulted in a vanadium loss rate was as low as 4%. SEM-EDS analysis indicates that a major cause of vanadium loss is entrapment and absorption by precipitates. The low vanadium loss rate using Ca(OH)2 as a neutralizer appears to be due to the smooth and flat surface of the precipitate, which limits vanadium entrainment. When the pH was adjusted with CaCO 3, the crystal structure of the precipitate was incomplete. In addition, CaSO4 and iron phosphate particles interact, promoting entrainment and absorption of vanadium. Similarly, flocculent iron phosphate was generated when the pH was adjusted with NaOH, Na2CO3, or ammonia, resulting in a crystal with a rough surface that easily entrained vanadium.

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a School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
b Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan 430070, China
c State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China
d Hubei Collaborative Innovation Centre for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China

* Corresponding author, E-mail: zym126135@126.com

Received 8 Jun 2018, Accepted 3 Feb 2019