固相还原法制备纳米氧化铁热力学分析及其实验研究

doi:10.19964/j.issn.1006-4990.2024-0209

Abstract

Abstract:

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 Fe₃O₄in the FeS₂-FeSO₄ reaction system within the temperature of 450 ℃，and the generated Fe₃O₄ reacted with FeSO₄to form α-Fe₂O₃base 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-Fe₂O₃by controlling FeSO₄/FeS₂ratio（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-Fe₂O₃nanoparticles.

Key words: ferrous sulfate, pyrite, α-Fe₂O₃, thermodynamic analysis

CLC Number:

TQ138.11

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.

Figures/Tables 7

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Thermodynamic analysis and experiment research on preparation of α-Fe₂O₃nanoparticles by solid-phase reduction method

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