Transactions of the Materials Research Society of Japan
Online ISSN : 2188-1650
Print ISSN : 1382-3469
ISSN-L : 1382-3469
Regular Papers
Reactivity of Cesium and Fly Ash under Hydrothermal Conditions with NaOH Solution
Toshinari KoriSeiichi SatoKenji NagataTakehiko Yokomine
Author information
JOURNAL FREE ACCESS

2016 Volume 41 Issue 1 Pages 29-33

Details
Abstract
The reactivity of Cs and fly ash and the immobilization of Cs in the reaction products were investigated under hydrothermal conditions with NaOH solution. Crystalline phases of reaction products varied with hydrothermal conditions such as reaction temperature, concentration of NaOH solution and reaction time. The amount of immobilized Cs increased with the crystallization of pollucite, but its value decreased with the formation of other phases as Cs0.84Na2.16Al3Si3O12·0.32H2O, hydroxysodalite and hydroxycancrinite. A part of Cs was exchanged to Na on Na-P1 zeolite, which was formed in a dilute NaOH solution at low temperature for a long reaction time. The synthesized pollucite was the solid solution between pollucite and analcime, and the atomic ratio of Cs/(Cs+Na) in obtained products was larger than the initial ratio of Cs and NaOH solution in the system. This result suggests that Cs is more easily immobilized in the structure of synthesized pollucite than Na under hydrothermal treatments.
Content from these authors
© 2016 The Materials Research Society of Japan
Previous article Next article
feedback
Top