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

Nan-nan Xue^a,b, Yi-min Zhang^a,b,c,*, Tao Liu^a,b,c, Jing Huang^a,b,c, Hong Liu^a,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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* Corresponding author, E-mail: zym126135@126.com

Received 3 Aug 2017, Accepted 3 Dec 2017