Adsorption and desorption characteristics of N235 levextrel resin for the dilute HCl Solution

Abstract

Abstract:The low concentration of hydrochloric acid produced during the separation process of rare earth no saponification extraction is best available for recycling. The adsorption and desorption characteristics of N235 resin on dilute HCl solution were investigated by static adsorption method and dynamic adsorption method. The adsorption equilibrium constant, the saturated adsorption capacity of resin and its relationship with the initial HCl concentration were obtained by static adsorption experiment. The results of dynamic adsorption showed that the adsorption flow rate, the resin column height, the HCl concentration, the chloride concentration in the solution, the downstream flow/countercurrent mode would affect the resin equilibrium adsorption capacity; Besides, the maximum concentration of HCl solution obtained by the adsorption and desorption of N235 resin on dilute HCl solution is equal to the initial concentration of adsorbate, and has obvious "memory effect",and with the method of alkali absorption can reach the enrichment of hydrochloric acid at extreme dilute solution.