Effect of Temperature of Regenerant on Removal of Radionuclides from Ion Exchange Resins

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Abstract
The amount of Sr85 and Csl34 eluted from cationic ion exchange resin columns was increased by raising the temperature of a regenerating salt solution: similarly ll3l elution from anionic resin was increased by heating 2N_HCl used for elution. Using a mixed Ca, K, Na and Mg chloride solution (total molarity =1.3) to strip 97% of the strontium from the resin, 9.78, 8.65, 7.2 and 6.45 resin bed volumes (rbv) of regenerant were needed at temperatures of 80[degree], 110[degree], 140[degree] and 170[degree]F, respectively. About 60% as much regenerant was needed to strip Csl34 from the resin as was needed for Sr85. Higher regenerant temperatures were also advantageous, although differences were not as marked as for Sr85. When stripping l131 from anion resin columns with 2N_HC1, temperatures of 76[degree], 100[degree], 120[degree], 140[degree] and 160[degree] F and flow rates of one-eighth and one-fourth rbv per minute were used. The amount of ll31 removed increased significantly with increasing temperature. The slower flow rate was more effective for l!31 stripping.

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