Enhanced vanadium adsorption performance on aminophosphonic chelating resin with oxalic acid regeneration

Abstract

Impurities adsorbed on the resin will hinder the adsorption of valuable ions and affect the reusability of the resin. In this paper, the reusability of D418 aminophosphonic chelating resin for vanadium enrichment from the acid leaching solution of black shale was studied with oxalic acid solution as regenerant. Under the regeneration conditions of oxalic acid concentration of 0.8 mol/L, and a reaction time of 30 min, the exhausted D418 aminophosphonic chelating resin was efficiently regenerated, and the vanadium adsorption efficiency increased from 83.97% to 94.87%, which was related to the formation of amide group. During the regeneration experiments, the oxalic acid can complex with Fe3+ and Al3+ to form Fe(C2O4)2-, Fe(C2O4)33-, Al (C2O4)2- and Al (C2O4)33-, and then effectively remove Fe3+ and Al3+ ions on the exhausted D418 aminophosphonic chelating resin. Meanwhile, the adsorption or desorption performance of Fe and Al on the resin was not changed significantly. Therefore, the D418 aminophosphonic chelating resin can be stably and effectively reused to adsorb vanadium from the acid leaching solution of black shale with oxalic acid regeneration.