The crystallization of magnesite from aqueous solution

Details The crystallization of magnesite from aqueous solution The crystallization of magnesite from aqueous solution

Jan 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37...87s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 1, pp.87-96

Physics

7

Scientific paper

It has been suggested that the highly hydrated character of the Mg 2+ 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 CO 2 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, pCO 2 and ionic strength. Contrary to classical kinetics, the reaction studied was inhibited by increased Mg concentration. Ionic strength and pCO 2 acted as positive catalysts.

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