Phase Composition of the Products of Fe Oxidation in Fe + C + NaCl + H2O + O2 Exothermic Mixtures |
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Authors: | I Z Babievskaya N F Drobot K S Gavrichev O A Noskova V A Krenev S V Korostin Yu V Permyakov |
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Affiliation: | (1) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia;(2) All-Russia Research Institute of Physicotechnical and Radio Engineering Measurements, Mendeleevo, Solnechnogorskii raion, Moscow oblast, 141570, Russia |
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Abstract: | Using thermodynamic analysis of the Fe–C–NaCl–H2O–O2 system and experimental studies (x-ray diffraction and Mössbauer spectroscopy) of exothermic mixtures containing Fe metal, activated carbon, water, and NaCl, we identified the state of Fe and determined the phase composition of the reaction products at different stages of oxidation with atmospheric oxygen. The calculation and experimental results are in reasonable agreement. Under the conditions of restricted access for air, the main oxidation product is magnetite, Fe3O4. Free access for air leads to the formation of hydrous ferric oxide, Fe2O3 · nH2O. The most stable phase under the conditions of interest is goethite, Fe2O3 · H2O (-FeOOH). Storage of incompletely oxidized samples away from air for 7–14 days leads to partial reduction of iron(III) oxide phases to Fe3O4 and -Fe. |
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