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

Abstract

ABSTRACT:The effect of K 2 SO 4 on the vanadium extraction with bis(2-ethylhexyl) phosphoric acid (D2EHPA)/tributyl phosphate (TBP) was studied in a pressure acid leaching system of stone coal. K 2 SO 4 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 K 2 SO 4 dosage is 7 wt.%, the H 2 SO 4 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 K 2 SO 4 intervention reduced the impurity load of vanadium extraction from stone coal acid leaching solution.

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

“…At present, the main methods for vanadium separation and concentration are solvent extraction [14][15][16] and ion exchange 17,18 . The solvent extraction method, with various extracting reagents, has gradually been the primary methods due to its high efficiency with no requirement for complex equipment 19 .…”