Sorption of Cesium from Strongly Alkaline Solutions on a Modified Ferrocyanide Sorbent Fersal

The sorption of cesium from solutions of sodium and potassium nitrates, sodium hydroxide, and also from a model solution simulating alkaline high-level waste (HLW) of PA Mayak on various resorcinol-formaldehyde sorbents (RFS), sorbent based on a boron-containing polymer of the Clevasol grade and on sorbent of the Fersal grade based on modified nickel ferrocyanide was studied under batch conditions. It is shown that in all the media studied, the Fersal sorbent has the best sorption-selective characteristics with respect to cesium. During the sorption of cesium from a model solution of HLW under column conditions, the volume of the passed solution to 1% breakthrough for the Fersal sorbent is 127 bed volumes (b.v.). The purification resource of the other studied sorbents is 3–4 times less. Desorption of cesium from the Fersal sorbent can be carried out by passing 9–10 b.v. 7.5 M HNO 3 , however, in this case, the sorbent pellets are destroyed, which does not allow reusing them. It is concluded that the Fersal sorbent is the most promising for the treatment of alkaline HLW.