Abstract
The safe treatment and disposal of radioactive organic solvents is a priority and a challenge in the field of radioactive waste management. Fenton oxidation is a promising method for transforming it into inorganic components. This work focused on cementation of the residues of spent organic solvent oxidized by Fenton reaction. Sulphoaluminate cement (SAC) was used as the matrix material with the addition of Ca(OH)2 and H3BO3. The influence of Ca(OH)2 and H3BO3 on the fluidity and setting time of cement mortar was studied. The cementation formula was optimized and a suitable cementation formula was obtained. The experimental results indicated that the 28 d compressive strength could reach 18.5 MPa. The results of the freeze-thaw test, immersion test, irradiation test and impact test also meet the requirement. The 42 d leaching rate was 8.0 × 10−4 cm/d for Sr2+, 3.4 × 10−3 cm/d for Cs+, and 3.5 × 10−7 cm/d for Co2+, all of which could meet the national standard requirements.
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