SYMPOSIA PAPER Published: 01 January 1992

Solidification of Dried Borate Waste with Polyester


An effective method to dry the sludge produced in a reaction between the evaporator concentrates of a pressurized water reactor (PWR) and calcium oxide (CaO) has been sought. The optimum reaction condition in this study for avoiding the adhesion of dried products to the heating wall of a dryer and for preventing the agglomeration of dried products was found to be about 0.75 mol ratio of CaO/boric acid (H3BO3). In this condition the dried products were porous spheres, and their true density was 2.04 × 103 kg/m3.

In the immersion test of the solidified forms with unsaturated polyester in deionized water for 520 days, the weight change of the solidified forms was not more than 1%, and their volume change was negligible. The specific gravity of the solidified form containing 40% by weight of dried products was 1.45 and increased to 1.55 with an increase of the dried products to 50% by weight. The compressive strength of a solidified form in the above range was increased from 139.3 to 162.8 MPa. The effective diffusion coefficients in the 18-month leaching test for Cs-137 and Co-60 were 2.08 × 10-15 m2/s and 3.30 × 10-19 -2.26 × 10-18 m2/s, respectively.

Author Information

Kim, H-Y
Korea Atomic Energy Institute, Taejon, Korea
Kim, K-H
Korea Atomic Energy Institute, Taejon, Korea
Park, H-H
Korea Atomic Energy Institute, Taejon, Korea
Suh, I-S
Korea Atomic Energy Institute, Taejon, Korea
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Developed by Committee: D34
Pages: 297–303
DOI: 10.1520/STP19559S
ISBN-EB: 978-0-8031-5186-4
ISBN-13: 978-0-8031-1443-2