[3F06-09] Secondary aqueous waste treatment 1

[3F07] Development of solidification techniques with minimised water content for secondary radioactive aqueous wastes in Fukushima

(2)Roles of phosphate on mineral formation of calcium aluminate cement

*Kieta Irisawa^1,2, Ines Garcia-Lodeiro², Takeshi Ohsugi¹, Osamu Nakazawa¹, Yoshihiro Meguro¹, Hajime Kinoshita² (1.Japan Atomic Energy Agency, 2.The University of Sheffield)

Keywords: Calcium Aluminate Cement, Phosphate, Amorphous phase

Fukushima secondary wastes (e.g. mainly Fe(OH)₃, CaCO₃ and Mg(OH)₂, concentrated effluent) contain a significant amount of water, sea salts and highly radioactive ⁹⁰Sr. In order to reduce hydrogen gas explosion and leakage risks for these wastes, we are aiming to develop phosphate cements with minimised water content. The present study investigates roles of phosphate modification on mineral formation in calcium aluminate cement.