Uptake of chloride and carbonate ions by calcium monosulfoaluminate hydrate |
| |
Authors: | Adel Mesbah Céline Cau-dit-Coumes Guillaume Renaudin Fabien Frizon Fabrice Leroux |
| |
Affiliation: | 1. Commissariat à l''Energie Atomique et aux Energies Alternatives, CEA DEN/DTCD/SPDE, F-30207 Bagnols sur Cèze, France;2. Clermont Université, ENSCCF, Laboratoire des Matériaux Inorganiques, BP 10448, F-63000 Clermont-Ferrand, France;3. Clermont Université, Université Blaise Pascal, Laboratoire des Matériaux Inorganiques, BP 10448, F-63000 Clermont-Ferrand, France;4. CNRS, UMR 6002, F-63177 Aubière, France |
| |
Abstract: | Decommissioning of old nuclear reactors may produce waste streams containing chlorides and carbonates, including radioactive 36Cl? and 14CO32?. Their insolubilization by calcium monosulfoaluminate hydrate was investigated. Carbonates were readily depleted from the solution, giving at thermodynamic equilibrium monocarboaluminate, monocarboaluminate + calcite, or calcite only, depending on the initial ratio between the anion and calcium monosulfoaluminate hydrate. Chloride ions reacted more slowly and were precipitated as Kuzel's salt, Kuzel's and Friedel's salts, or Friedel's salt only. Rietveld refinement of X-Ray powder diffraction patterns was successfully used to quantify the phase distributions, which were compared to thermodynamic calculations. Moreover, analysing the lattice parameters of Kuzel's salt as a function of its chloride content showed the occurrence of a restricted solid solution towards the sulfate side with general formula 3CaO·Al2O3·xCaCl2·(1 ? x)CaSO4·(12 ? 2x)·H2O (0.36 ≤ x ≤ 0.50). |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|