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Analysis of Antimony Sulfide Oxidation Mechanism in Oxygen-Enriched Smelting Furnace

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Abstract

The phase transformation mechanism of antimony sulfide in the oxygen-enriched smelting system was investigated. The standard Gibbs free energy change (ΔGθ) of reactions in the smelting system at 100 ~ 1400°C were calculated, indicating that the reaction between Sb2S3 and oxygen was liable to occur first, and that the high-valent antimony oxide decomposed at high temperatures. The thermodynamic analysis of the Sb-S–O system at different temperatures indicated that the phase transformation of antimony was feasible, and that the increase in temperature was beneficial to the existence of Sb2O3. Equilibrium calculation of Sb2S3 and oxygen showed that the antimony mainly volatilized into the gas phase, and that a small amount of antimony formed non-volatile antimony oxides. Thermogravimetric analysis of antimony oxide verified the accuracy of the thermodynamic analysis. A conceptual oxidation model in the oxygen-enriched smelting process is proposed, combined with the thermodynamic analysis, equilibrium calculation, and thermogravimetry–differential scanning calorimetry (TG-DSC) analysis of the oxygen-enriched smelting system.

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Acknowledgements

The authors acknowledge financial support from the National Natural Science Foundation of China (No. U20A20273 and No. 51904351), National Key R&D Program of China (No. 2019YFC1907401), Natural Science Foundation for Distinguished Young Scholar of Hunan Province (No. 2022JJ10078), Science and Technology Innovation Program of Hunan Province (No. 2021RC3005), Innovation Driven Projects of Central South University (No. 2020CX028).

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  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Mingxing Huang, Qinmeng Wang, Songsong Wang & Xueyi Guo

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  1. Mingxing Huang
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  2. Qinmeng Wang
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  3. Songsong Wang
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  4. Xueyi Guo
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Correspondence to Qinmeng Wang.

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Huang, M., Wang, Q., Wang, S. et al. Analysis of Antimony Sulfide Oxidation Mechanism in Oxygen-Enriched Smelting Furnace. JOM 75, 506–514 (2023). https://doi.org/10.1007/s11837-022-05609-1

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