β Scribed by S. V. S Rao; H. Kothandaraman; M. Sudhakar; K. B. Lal; R. V. Amalraj
No coin nor oath required. For personal study only.
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. Characterization of the matrices was carried out with respect to dimensional changes, compressive strength, and leach resistance. The cumulative percentage weight loss and volume change were observed to decrease with the increase in boric acid concentration before attaining a plateau. The diffusion coefficients were in the order of M*/s, and the compressive strengths were in the range of 0.83 to 12 MPa. Infrared spectral studies on the urea-formaldehyde matrices revealed that the rate and the extent of cure depended on the type of resin.
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The leaching rate of cobalt-60 and cesium-137 in cement has been studied. The solidification matrix was a standard Portland cement mixed with 300-360 (kg/m 3) spent ion exchange resins, with or without 2-5% of bentonite clay. The leaching rates from the cement marix were measured as Co-60: (4, 2-6,