Recovery of vanadium(V) from synthetic and real leach solutions of spent catalyst by solvent extraction using Cyphos IL 104

Abstract

This study addresses the extraction and recovery of vanadium(V) from synthetic and real leach solution of spent V2O5 catalyst using Cyphos IL 104. Vanadium(V) is extracted as [(R3R′P+)4H2V10O284−]org in Cyphos IL 104 and stripped from the loaded organic phase as VO2+ using HNO3 as a stripping agent. The extractant is recyclable up to several cycles and shows high loading capacity. Vanadium(V) was separated from aluminium(III), titanium(IV), chromium(III), manganese(II), iron(II)/(III), molybdenum(VI) and tungsten(VI) with good separation factors. Metals were leached from spent catalyst using alkaline leaching. McCabe-Thiele plots indicated two stages for both extraction and stripping at A/O and O/A = 3/1. Vanadium is finally recovered as V2O5 from the strip liquor and characterized by XRD, FE-SEM and EDX techniques.