The kinetics and thermodynamics of the process of sorption of chromium (VI) ions by the anion exchanger were studied. Certain kinetic and thermodynamic parameters show that the anionite has a high tendency to chromium (VI) ions, and its resistance to strong oxidizing agents is due to the presence of strong basic groups in the composition. The processes of sorption and desorption of chromium (VI) ions by the synthesized anion exchanger under dynamic conditions have been studied. The results obtained indicate that the anion exchanger is chemically stable and can be used repeatedly. Thus, the obtained ion-exchange fibrous sorbents are promising for use in hydrometallurgy, in the purification of industrial wastewater from toxic chromium (VI) ions.