STUDY ON THE PERFORMANCE AND MECHANISM OF ADSORPTING RHENIUM BY USING NEUTRAL PHOSPHOROUS-BASED LEVEXTREL RESINⅡ. CL-P350-KReO4-HCl System

摘要

＜正＞ In this paper study on the property and mechanism of adsorpting rhenium from aqueous hydrochloric acid by using methyl phosphorous acid dimythyl heptyl ester levextrel resin （CL - P350） is reported. The effects of time, acidity, concentration of rhenium, and temperature on the adsorption of rhenium were investigated. The mechanism of adsorpting rhenium was discussed by chemical analytic and IR method, and dynamic adsorption and elution were studied. Experimental results show that the adsorption equilibration is reached in 4 min, the distribution coefficient （D） of Re （Ⅶ） increases with increase of concentration of HCl and reaches maximum 3.0 - 4. OmoL/L HCl. ReO4- is taken up by ion association mechanism and can be described by Langmuir equation of the equilibrium state. The thermody-namic parameters in the adsorption process of ReO4- have been determined to be: △H= - 29KJ/moL,△G = - 25KJ/moL and △S = - 13.5J/moL respectively. The saturation adsorption capacity of rhenium is 19.2mg/g when the solution containing 0.372g/L Re and 3. 0mol/L HCI was passed through the resin column. The recovery percentage of rhenium is 98.4% while distilled water was used as an eluent.