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Solubility of Fe-ettringite (Ca6[Fe(OH)6]2(SO4)3 · 26H2O) |
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| Authors: | Göril Möschner Barbara Lothenbach Andrea Ulrich Ruben Kretzschmar |
| Institution: | a Empa, Swiss Federal Institute for Material Testing and Research, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland b CEREGE, Centre Européen de Recherche et d’Enseignement de Géosciences de l’Environnement, UMR 6635 CNRS—Univ. Paul Cézanne, IFR PMSE 112, Europôle Méditerranéen de l’Arbois-BP 80, 13545 Aix en Provence-cedex 04, France c Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CHN, CH-8092 Zürich, Switzerland |
| Abstract: | The solubility of Fe-ettringite (Ca6Fe(OH)6]2(SO4)3 · 26H2O) was measured in a series of precipitation and dissolution experiments at 20 °C and at pH-values between 11.0 and 14.0 using synthesised material. A time-series study showed that equilibrium was reached within 180 days of ageing. After equilibrating, the solid phases were analysed by XRD and TGA while the aqueous solutions were analysed by ICP-OES (calcium, sulphur) and ICP-MS (iron). Fe-ettringite was found to be stable up to pH 13.0. At higher pH-values Fe-monosulphate (Ca4Fe(OH)6]2(SO4) · 6H2O) and Fe-monocarbonate (Ca4Fe(OH)6]2(CO3) · 6H2O) are formed. The solubilities of these hydrates at 25 °C are:  |
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