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Research articles

ScienceAsia 43 (2017): 302-311 |doi: 10.2306/scienceasia1513-1874.2017.43.302

Effect of K2SO4 on solvent extraction of vanadium with D2EHPA/TBP

Nan-nan Xuea,b, Yi-min Zhanga,b,c,*, Tao Liua,b,c, Jing Huanga,b,c, Hong Liua,c

ABSTRACT:     The effect of K2SO4 on the vanadium extraction with bis(2-ethylhexyl) phosphoric acid (D2EHPA)/tri-butyl phosphate (TBP) was studied in a pressure acid leaching system of stone coal. K2SO4 intervention achieved good removal of Al and Fe on the premise of high V leaching efficiency during pressure acid leaching. Studies show that when the K2SO4 dosage is 7 wt.%, the H2SO4 concentration is 15 vol.%, the liquid/solid ratio is 1.5 ml/g, the leaching temperature is 190 °C, and the leaching time is 5 h, then 90% of V can be leached, but only 30% of Al and 6% of Fe are leached together. After four-stage countercurrent extraction with 20% vol D2EHPA at pH 1.8, the loaded organic phase showed a feature of more V ions with fewer Al and Fe ions, indicating that K2SO4 intervention reduced the impurity load of vanadium extraction from stone coal acid leaching solution.

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a School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
b Hubei Provincial Engineering Technology Research Centre of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, China
c Hubei Collaborative Innovation Centre for High Efficient Utilization of Vanadium Resources, Wuhan 430081, China

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

Received 3 Aug 2017, Accepted 3 Dec 2017