Fabrication and evaluation of hybrid materials from A-zeolite and ground glass powders for vitrified radioactive waste

Abstract

The samples from A-type zeolite and ground soda-lime glass powders were solidifed by calcinations at 600 to 800°C in air atmosphere. These hybrid zeolite/glass samples at 700°C were in part insufficiently densified and hybrid samples were fully densified at 800°C, although the densification was not generated at 600°C. A-zeolites were still stable in glass melt at 800°C for hybrid zeolite/glass samples. These hybrid zeolite/glass samples had the ion exchange ability of 20% against Sr 2+ and the high ability over 80% against Cs + as well as A-zeolite. Microstructures of obtained hybrid zeolite/glass samples were evaluated.

Ion-exchange properties of zeolite/glass hybrid materials

“…zeolite in the hybrid materials. This evolution of removal rate is similar to that reported by Kamitani et al 7) using A-type zeolite materials, with our study showing higher removal rates. The hybrid materials with X-type zeolite showed different removal rates compared with the other hybrid materials, especially for zeolite content greater than 20%.…”

“…Kamitani et al have reported that a pellet-like sample of hybrid materials of soda-lime glass and A-type zeolite can remove cesium and strontium ions. 7) Although hybrid materials from zeolites and soda-lime glass are interesting and attractive as an ion-exchange material, there is no report on hybrid materials using other types of zeolites. The Si/Al ratio of A-type zeolite is equal to 1, which is the minimum value for zeolites.…”

“…Samples of hybrid materials were prepared from zeolites and soda-lime glass following the work reported by Kamitani et al 7) As starting zeolite sources, A-type zeolite (Wako Pure Chemical, 99.9%), X-type zeolite (Wako Pure Chemical, 99.9%), Y-type zeolite (Wako Pure Chemical, 99.9%), and mordenite zeolite (Wako Pure Chemical, 99.9%) were used. Soda-lime glass powder was obtained from dry ball milling of commercial window glass.…”

Synthesis of A-Type Zeolite from Flat Glass Recycle by Hydrothermal Treatments and its Evaluation

“…2 (a). Previous papers report that the existence of Ca enhance the formation of calcium aluminate and subsequently inhibit the formation of useful A type zeolite on the hydrothermal treatments [14][15][16]. It is thought that this reason is because calcium aluminate was not generated since Ca content was removed by pretreatment.…”