โ Scribed by S.V.S. Rao; K.B. Lal; P.K. Panicker; S.V. Narasimham
No coin nor oath required. For personal study only.
Fixation of Copper Ferrocyanide Cake (CFC), which is generated from the chemical treatment plant of lowlevel radioactive liquid effluent in a urea-formaldehyde (UF) matrix, was carried out. Boric acid was used as a catalyst for the UF polymerization. The physical properties such as compressive strength and diffusion coefficient were evaluated for UF waste forms and were compared with those of Ordinary Portland Cement (OPC) waste forms. While the compressive strengths of UF and OPC waste forms were comparable, the former showed diffusion coefficients about two to three orders lower. Almost all the cesium was released from the OPC waste form that contained less than 18% of CFC by weight in the final waste form. The release of cesium from the OPC waste forms was high due to the presence of high alkalinity and calcium ions in the cement. To find out the temperature rise in the preparation of UF waste form, blocks having a size of about 5 1 were prepared; it was observed that there was no increase in peak center temperatures during the curing process.
๐ SIMILAR VOLUMES
Studies have been carried out on the immobilization of spent ion-exchange resins produced in nuclear power plants in urea-formaldehyde matrix. The matrices were prepared by incorporating different types of ion-exchange resins in the pH range of 4.5 to 5.0, using boric acid as a catalyst. Characteriz