Open AccessEffect of Fe 2 O 3
Author(s) -
Hailin Yang,
Mingjiao Fu,
Bobo Wu,
Ying Zhang,
Ruhua Ma,
Jueshi Qian
Publication year - 2019
Publication title -
science and technology of nuclear installations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.417
H-Index - 24
eISSN - 1687-6083
pISSN - 1687-6075
DOI - 10.1155/2019/4936379
Subject(s) - sintering , ceramic , materials science , melting point , mineralogy , metallurgy , chemistry , composite material
For the proposed novel procedure of immobilizing HLW with magnesium potassium phosphate cement (MKPC), Fe 2 O 3 was added as a modifying agent to verify its effect on the solidification form and the immobilization of the radioactive nuclide. The results show that Fe 2 O 3 is inert during the hydration reaction. It slows down the hydration reaction and lowers the heat release rate of the MKPC system, leading to a 3°C-5°C drop in the mixture temperature during hydration. Early comprehensive strength of Fe 2 O 3 containing samples decreased slightly while the long-term strength remained unchanged. For the sintering process, Fe 2 O 3 played a positive role, lowering the melting point and aiding the formation of ceramic structure. CsFe(PO 4 ) 2, or CsFePO 4, was generated by sintering at 900°C. These products together with the ceramic structure and absorption benefit the immobilization of Cs + . The optimal sintering temperature for heat treatment is 900°C; it makes the solidification form a fired ceramic-like structure.