Research articles
ScienceAsia (): 43-49 |doi:
10.2306/scienceasia1513-1874...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.
Download PDF
135 Downloads 1826 Views
| 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
|
