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Thermodynamic analysis and experiment research on preparation of α-Fe2O3nanoparticles by solid-phase reduction method
Received date: 2024-04-11
Online published: 2025-04-21
Thermodynamic analysis is an important means of studying chemical reactions.The possible occurrence of chemical reactions in the reaction system and effect of reaction conditions on equilibrium compositions are predicted by conducting thermodynamic analysis.In order to reveal the mechanism of FeS2-FeSO4 reaction system for preparing iron oxide and theoretical basis for the preparation of material，thermodynamic analysis of FeS2-FeSO4 reaction system was performed by HSC Chemistry software.The analysis results according to the ∆rG⊖ and chemical equilibrium composition of the reaction process at different temperatures showed that R1~R2 reaction were undergone to generate α-Fe2O3 and Fe3O4 in the FeS2-FeSO4 reaction system within the temperature of 450 ℃，and the generated Fe3O4 reacted with FeSO4 to form α-Fe2O3 base on R12 reaction.But at this temperature，R1~R2 reaction were incomplete.The thermodynamic analysis showed that R1~R2 were all endothermic reactions，and the ∆rG⊖ of R1 was less than that of R2 and equilibrium constant of R1 was greater than that of R2 at the same temperature，indicating that it was more conducive to the R1 reaction.When the temperature was rised to 500 ℃，R1~R2 reaction could proceed relatively completely.In addition，the produced Fe3O4 could be fully reacted with FeSO4 to form α-Fe2O3 by controlling FeSO4/FeS2 ratio（13∶1），which was greater than the theoretical ratio of reaction R1.Based on thermodynamic analysis，α-Fe2O3 with the mean diameter of 62 nm was successfully synthesized by solid-phase reduction method at 500 ℃ for 60 minutes with the FeSO4/FeS2 ratio of 13∶1.From this，it could be seen that thermodynamic analysis of the FeS2-FeSO4 reaction system provided theoretical basis for the preparation of α-Fe2O3 nanoparticles.
Key words： ferrous sulfate; pyrite; α-Fe2O3; thermodynamic analysis
REN Genkuan , LUO Xin , ZHU Denglei , ZHANG Min . Thermodynamic analysis and experiment research on preparation of α-Fe2O3nanoparticles by solid-phase reduction method[J]. Inorganic Chemicals Industry, 2025 , 57(4) : 73 -78 . DOI: 10.19964/j.issn.1006-4990.2024-0209
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