Immobilization of simulated 137Cs in waste soda-lime glass modified by Ca, Ba, and B2O3.

R²⁺ (R = Ca, Ba) and B₂O₃-modified waste soda-lime glass's immobilization of Cs is investigated using product consistency tests. The introduction of Ca²⁺ and Ba²⁺ to waste glass can inhibit the diffusion motion of Cs⁺ in glass network, and thus reducing the leaching concentration of Cs⁺. The excessive addition of Ca²⁺ to waste glass produced the crystallization of CaSiO₃ and Ca(Si₂O₇)B₂O phases and worsened the ability to immobilize Cs. When B₂O₃ exists as [BO₄] units in glass, the normalized leaching concentration of Cs⁺ is decreased, the existence of [BO₃] units in glass can diminish its ability to immobilize Cs. [ABSTRACT FROM AUTHOR]