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A simple method for synthesizing magnesite (MgCO 3 ) from hydromagnesite (3MgCO 3 ·Mg(OH) 2 ·3H 2 O) at atmospheric conditions has been suggested. Monoethylene glycol (MEG) was used to decrease the water activity and avoid the hydrate phases of magnesium carbonate. An aqueous solution containing 95 wt % MEG was refluxed at 150 °C with continuous CO 2 (g) flow. This aided transformation of the metastable hydromagnesite into the thermodynamically stable magnesite.
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Sandengen et al. (2008) studied this question.
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