STP1123

    Solidification of Dried Borate Waste with Polyester

    Published: Jan 1992


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    Abstract

    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.

    Keywords:

    volume reduction, solidification, H, 3, BO, 3, unsaturated polyester, CaO, mechanical properties, leaching


    Author Information:

    Kim, H-Y
    Principal researcher, senior researcher, director, and vice president, Korea Atomic Energy Institute, Taejon,

    Kim, K-H
    Principal researcher, senior researcher, director, and vice president, Korea Atomic Energy Institute, Taejon,

    Park, H-H
    Principal researcher, senior researcher, director, and vice president, Korea Atomic Energy Institute, Taejon,

    Suh, I-S
    Principal researcher, senior researcher, director, and vice president, Korea Atomic Energy Institute, Taejon,


    Paper ID: STP19559S

    Committee/Subcommittee: D34.01

    DOI: 10.1520/STP19559S


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