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- Title
高庙子钠基膨润土化学性能热力学模拟.
- Authors
李娜娜; 康明亮; 刘月妙; 郭永海; 苏锐
- Abstract
The geochemical stability of near field in high level radioactive waste disposal repository is mainly controlled by long term chemical interaction between bentonite and groundwater. The reaction processes of GMZ Na-bentonite in purified water and Beishan groundwater at different temperatures were calculated respectively from thermodynamic aspects using software PHREEQC in the paper. Secondary minerals, pH value and main cation composition were simulated. The results showed that secondary minerals generated in purified water were gibbsite, goethite, Mg-montmorillonite, and Ca-montmorillonite, the secondary minerals generated in Beishan groundwater were gibbsite, goethite, Mg-montmorillonite, and calcite successively, as well as pH value could maintain in the alkaline range. The secondary mineral species were not affected by temperature, but interaction process could be influenced by temperature. The SiO2 concentration-pH equilibrium phase diagrams of key minerals in bentonite-groundwater system at different temperatures were obtained at last.
- Subjects
MINERALS; GROUNDWATER temperature; GIBBSITE; RADIOACTIVE waste repositories; PHASE equilibrium; PHASE diagrams; RADIOACTIVE waste disposal
- Publication
World Nuclear Geoscience, 2022, Vol 39, Issue 2, p269
- ISSN
1672-0636
- Publication type
Article
- DOI
10.3969/j.issn.1672-0636.2022.02.010