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Thermodynamic Analysis on the Reduction Smelting of Stainless Steel Pickling Sludge

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Abstract

The thermodynamic analysis on the reduction smelting of stainless steel pickling sludge was reported in this paper. The predominance area diagram of Fe–Ni–Cr–C–O system, and phase diagrams of CaF2–SiO2–CaO–Al2O3–MgO system were first thermodynamically constructed. The effects of temperature, CaF2 content, and SiO2 addition on the melting temperature and viscosity of slag were calculated. Then the reduction smelting experiments were carried out under various SiO2 addition at 1400 °C. The thermodynamical results show that the reduction reaction can occur in the Ni + Fe + Cr2O3 phase stable region by controlling the relevant thermodynamic conditions during reduction, which can realize the Fe–Ni phase enriched in the alloy. The experiments results indicate that the variation of SiO2 addition can affect the distribution of Fe, Cr, and Ni elements in the alloy and slag. When the SiO2 addition is 50%, the contents of Fe and Cr in the alloy can reach 72.39% and 20.98%, respectively. The mineralogy of the reduction products demonstrated that the distinguishable crystal phase in the alloy mainly contained FeNi intermetallic compounds, and the slag was mainly composed of fluorite and calcium silicate.

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Acknowledgements

This study is supported by the National Natural Science Foundation of China (Grant Nos. 52004111, 51864019), the Program of Qingjiang Excellent Young Talents, Jiangxi University of Science and Technology, the Science and Technology Research Project of Jiangxi Education Department (Grant No. GJJ170508), the Jiangxi Province Natural Science Foundation of China (Grant No. 20181BAB206019), and the Research Fund Program of Guangdong Key Laboratory of Radioactive and Rare Resource Utilization (Grant No. 2018B030322009).

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Authors and Affiliations

  1. Institute of Green Metallurgy and Process Intensification, Jiangxi University of Science and Technology, Ganzhou, 341000, China

    Zhongtang Zhang & Yuhu Li

  2. China Nerin Engineering Co., Ltd., Nanchang, 330031, China

    Feng He & Huilan Yang

  3. Ganzhou Engineering Technology Research Center of Green Metallurgy and Process Intensification, Ganzhou, 341000, China

    Zhongtang Zhang & Yuhu Li

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  1. Zhongtang Zhang
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  2. Yuhu Li
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  4. Huilan Yang
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Correspondence to Yuhu Li.

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The contributing editor for this article was Il Sohn.

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Zhang, Z., Li, Y., He, F. et al. Thermodynamic Analysis on the Reduction Smelting of Stainless Steel Pickling Sludge. J. Sustain. Metall. 7, 1393–1405 (2021). https://doi.org/10.1007/s40831-021-00431-6

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