Uptake of chloride and carbonate ions by calcium monosulfoaluminate hydrate

作者：Me**ah Adel; Cau dit Coumes Celine^*; Renaudin Guillaume; Frizon Fabien; Leroux Fabrice

来源：Cement and Concrete Research, 2012, 42(8): 1157-1165.

DOI：10.1016/j.cemconres.2012.05.012

• Waste management (E)
• Monosulfate (D)
• Chloride (D)
• Carbonation (C)
• X-ray diffraction (B)

Decommissioning of old nuclear reactors may produce waste streams containing chlorides and carbonates, including radioactive Cl-36(-) and (CO32-)-C-14. 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%26apos;s salt, Kuzel%26apos;s and Friedel%26apos;s salts, or Friedel%26apos;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%26apos;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 center dot Al2O3 center dot xCaCl(2)center dot(1 - x)CaSO4 center dot(12 - 2x)center dot H2O (0.3 %26lt;= x %26lt;= 0.50).

• 出版日期2012-8
• 单位中国农业大学; 中国地震局