Concentration of rhenium from dilute sodium chloride solutions

Abstract

The conditions for the desorption of rhenium from the anion exchange resin Dowex 1-x8 by HNO 3 , HCl, H 2 SO 4 and NaOH were determined. The solution (5.0×10 -3 mol dm -3 Re in 0.15 mol dm -3 NaCl) was passed through a column containing 0.10 g of the resin. The total sorbed amount of rhenium was 0.20 g/g of the resin. It was then eluted by the corresponding eluent in the concentration range up to about 3.0 mol dm -3 . The highest elution efficiency and the most favourable elution profile were found with 3.0 mol dm -3 HNO 3 . Over 77 % of the sorbed rhenium was found in the first 5 ml of the eluate. Practically all the rhenium was recovered with 20 ml of the acid. Under the given experimental conditions, HCl and H 2 SO 4 were less favourable while NaOH was not applicable, due to very low efficiency of rhenium elution.

Design of a strong-base anion exchanger and its adsorption and elution behavior for rhenium(VII)

“…9 Lan et al used a gel type resin 201 Â 7 for the recovery of Re(VII) from a molybdenite calcine and Lukic et al used Dowex1-x8 for the adsorption of Re(VII) from dilute sodium chloride solutions. 10,11 The above strongly basic anion exchange resins which contain alkylamino had poor stability against radiation or high acidity. 12 Furthermore, all these materials were not suitable for column application due to their poor mechanical stability or high pressure drop.…”