The crystallization of magnesite from aqueous solution |
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| Authors: | FL Sayles WS Fyfe |
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| Institution: | Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 USA;Department of Geology, University of Manchester, Manchester, England |
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| Abstract: | It has been suggested that the highly hydrated character of the Mg2+ ion in aqueous solution is responsible for the often encountered difficulty of precipitating stable, anhydrous phases of magnesium carbonate and calcium-magnesium carbonate. In an effort to investigate this, a study of magnesite crystallization kinetics was undertaken, utilizing the reaction of hydromagnesite plus CO2 to yield magnesite at 126°C. The reactions were characterized by prolonged initial quiescent periods prior to the onset of detectable crystallization. The length of the initial period was found to vary with Mg concentration, pCO2 and ionic strength. Contrary to classical kinetics, the reaction studied was inhibited by increased Mg concentration. Ionic strength and pCO2 acted as positive catalysts. |
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