Study of the mechanism of vanadium sorption on anion-exchange resin

Abstract

This article presents the results of a study of the mechanism of vanadium sorption from productive solutions of black shale ores on the macroporous strongly basic anion exchange resin Biolite 200U. The studies were conducted in the pH range of 1.5–1.9, where vanadium is predominantly in the form of anionic compounds (meta-, poly-, and decavanadates). Using IR spectroscopy and X-ray diffraction analysis, it was established that the sorption process is caused by the exchange of vanadate ions with quaternary ammonium centers of the resin and is accompanied by the participation of bridging sulfate groups. The formation of stable complex compounds with the precipitation of Na₃VO₄ and VOCl₃ phases was detected. Based on the data obtained, a mechanism for the sorption of vanadium in the form of stable phase compounds is proposed.