Efficiency of a blast furnace slag cement for immobilizing simulated borate radioactive liquid waste

摘要

The efficiency of a blast furnace slag cement 9Spahish CEM III/B) for immobilizing simulated radioactive borate liquid waste [containing H_3BO_3, NaCl, Na_2SO_4 and Na(OH)] has been evaluated by means of a leaching attack in de-mineralized water at the temperature of 40 deg. C over 180 days. The leaching was carried out according to the ANSI/ANS-16.1-1986 test. Moreover, changes of the matrix microstructure were characterized through porosity and pore-size distribution analysis carried out by mercury intru- sion porosimetry (MIP), X-ray diffraction (XRD) and thermal analysis (TG). The results were compared with those obtained form a calcium aluminate cement matrix, previously published.