A study on Iodine Release Behavior from Iodine-Immobilizing Cement Solid

Autor:	Hitoshi Owada, Masamichi Obata, Haruguchi Yoshiko, Ryota Takahashi, Shinichi Higuchi, Tomofumi Sakuragi
Rok vydání:	2013
Předmět:	Cement Gypsum Materials science Aluminate chemistry.chemical_element engineering.material Calcium Iodine law.invention chemistry.chemical_compound Portland cement Chemical engineering chemistry law engineering Composite material Dissolution Groundwater
Zdroj:	MRS Proceedings. 1518:85-90
ISSN:	1946-4274 0272-9172
DOI:	10.1557/opl.2013.68
Popis:	An iodine-immobilizing cement solidification process using calcium aluminate cement with gypsum additive was developed. Powdered cement solid was repeatedly immersed in ion-exchanged water with varying liquid-to-solid ratios (L/S) in accelerated dissolution tests simulating interaction with groundwater at waste disposal sites. The measured concentrations of iodine in the water were on the order of 10−5 to 10−3 mol⋅dm−3 in the entire L/S range. These concentration levels are extremely low compared with those in the case of ordinary Portland cement. Calculations with a solution equilibrium model for the cement immersed in ion-exchanged water showed that the observed iodine release profile versus integrated L/S ratio from the immersion test was explained by a dissolution model of minerals in the cement.
Databáze:	OpenAIRE
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