Equilibrium between (Li,Na,K,Mg)-carbonate melt, gaseous CO<sub>2</sub> and MgO
article
Considerable amounts of MgCO<sub>3</sub> may appear in alkali metal carbonate melts in contact with MgO and carbon dioxide gas. The equilibrium between dissolved MgCO<sub>3</sub>, MgO and carbon dioxide gas has been studied. The results satisfactorily obey thermodynamic theory based upon a melt model used by Förland for the similar system with CaCO<sub>3</sub> and CaO. Values of the melting point (∼990°C) and for the heat of melting (∼14 kcal/mole) of MgCO<sub>3</sub> (at 1 atm CO<sub>2</sub> pressure) have been derived. "Anomalous" results obtained below about 550°C when heating clear (Li,Na,K,Mg)-carbonate melts (under carbon dioxide) are attributed to the appearance of an "active" form of MgO. Some data on the quaternary system Li<sub>2</sub>CO<sub>3</sub>+Na<sub>2</sub>CO <sub>3</sub>+K<sub>2</sub>CO<sub>3</sub>+MgCO<sub>3</sub> have been obtained. MgO is not "inert" against molten alkali metal carbonates under appropriate conditions.
TNO Identifier
280818
ISSN
00147672
Source
Transactions of the Faraday Society, 63, pp. 175-184.
Pages
175-184
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