Separation and recovery of vanadium from leaching solution of calcium roasting vanadium slag by extraction with P204 extractant

In this study, an efficient method for recovery of vanadium (V) from leaching solution of calcium roasting vanadium slag by extraction with di(2-ethylhexyl) phosphate (P204) was proposed. The impact of initial pH value, P204 concentration, contact time, phase ratio (O/A) and temperature on vanadium recovery were analyzed. The effects of stripping agent, O/A, contact time and temperature on the V stripping were analyzed. The maximum V extraction rate was 99.74 % through three-stage extraction under the conditions: 50 % P204, O/A of 1:1, pH of 4.0, 8 min, 30℃. The three-stage maximum vanadium stripping rate was 98.38 % under the conditions of 2.5 M H 2 SO 4 solution, 10 min, 30 ℃. The purity of the recovered V 2 O 5 was 99.59 % when the pH value was 2.0. The extraction mechanism of vanadium was confirmed as cation exchange mechanism by using Fourier transform infrared spectroscopy.