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Article Dans Une Revue Cement and Concrete Research Année : 2012

Uptake of chloride and carbonate ions by calcium monosulfoaluminate hydrate

Résumé

Decommissioning of old nuclear reactors may produce waste streams containing chlorides and carbonates, including radioactive 36Cl− and 14CO3 2−. 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).
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Dates et versions

hal-00714608 , version 1 (05-07-2012)

Identifiants

  • HAL Id : hal-00714608 , version 1

Citer

Adel Mesbah, Céline Cau-Dit-Coumes, Guillaume Renaudin, Fabien Frizon, Fabrice Leroux. Uptake of chloride and carbonate ions by calcium monosulfoaluminate hydrate. Cement and Concrete Research, 2012, 42, pp.1157-1165. ⟨hal-00714608⟩
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