Solidification and leaching property by time progress of the sludge containing fluoride

Tsunashima, Yasumichi; Ohashi, Yusuke ; Shimazaki, Masao; Nomura, Mitsuo; Tanaka, Yoshio 

The operation waste of uranium conversion plant and uranium enrichment plant is called sludge, and contains many fluoride which is deleterious material. For disposal, elution of fluoride is a problem. Moreover, sludge contains many calcium sulfate and we are anxious about expansion of cement solidification object by superfluous generation of Ettringite. In order to solve these subjects, the solidification examination of the sludge which used calcium hydrogen phosphate is considered as magnesium oxide system solidification material. The solidification and leaching property by time progress of the sludge containing fluoride are reported.