Study on leaching behavior of Cs+ from AASC solidified forms of simulated high-level radioactive liquid waste

This paper describes study on exchange properties of Cs+ in Alkali-Activated Slag Cement (AASC) solidified forms of simulated High-level Radioactive Liquid Waste (HLRW) by adding NiSO4 and K4[Fe(CN)6]. The results show that the exchanging rate for Cs+ is relative rapid, in the wide range of both pH and temperature. At 25 degree C, after 42 days, the leaching rate of Cs+ from AASC solidified from is at the level of 10-6 cm·d-1 (adapting China's National Standard 7023-86), 3.24% of the rate from the original form. At 90 degree C, after 28 days, that leaching rate of Cs+ is at the level of 10-4 g·cm-2·d-1 (adapting MCC-1 method), 4.85% of the rate from the original form