Available thermodynamic data on the reaction 2Fe 3 O 4 + CO 2 <--> 3Fe 2 O 3 + CO are reviewed. Further calculations regarding the equilibrium constant are presented and an approximate evaluation of the ratio of CO 2 to CO at equilibrium is made. From these data the conclusion is reached that oxidation of Fe 3 O 4 by CO 2 at temperatures between 200 degrees C and 500 degrees C is possible only when the ratio of CO to CO 2 is less than 1:10 12 and 1:10 7 respectively. Such ratios indicate that the reaction tends to proceed virtually irreversibly to the left and that, therefore, oxidation of Fe 2 O 4 by CO 2 is highly improbable as a process of formation of hematite deposits at or near limestone contacts.

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