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Electrochemical characterization of fine-grained blast furnace sludge after acid leaching using carbon paste electrode

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Abstract

The paper deals with the study of electrochemical properties of blast furnace sludge after acid leaching (BFSL) using modified carbon paste electrodes (CPEs) in acidic (1 M HCl) and alkaline (1 M NaOH) electrolyte. A polyamide holder with exchangeable tips was developed. The effect of their geometric parameters on the electrochemical response was monitored. The electrochemical characterization was performed by cyclic voltammetry (CV) at different scan rates. The hematite and magnetite served as comparative model modifiers. The identification of reaction products was performed using the RTG diffraction and SEM/EDX analyses. It was found that reduction reactions are suppressed at acidic pH. On the contrary, in an alkaline media, a significant peak corresponding to the electrode reduction of iron oxides based on the scheme Fe3+ → Fe2+ → Fe0 was identified in the BFSL reduction region. XRD and SEM analyses of the active surface of modified CPE showed the formation of nanostructured Fe. The results provide direction for the further use of BFSL.

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Acknowledgements

The study was supported by grants from the Ministry of Education of the Czech Republic research project nos. SP2017/50 and no. SP2018/79. Some of the analytical work was performed using equipment that was financed by the project “Institute of Clean Technologies for Mining and Utilisation of Raw Materials for Energy”, reg. no. LO1406, and supported by the “Research and Development for Innovations Operational Programme”, which is financed by structural funds from the European Union and the state budget of the Czech Republic.

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Authors and Affiliations

  1. Department of Chemistry, VŠB - Technical University of Ostrava, 17. listopadu 15, Ostrava - Poruba, 708 33, Czech Republic

    V. Novák, P. Raška & B. Kostura

  2. Department of Geological Engineering, VŠB-Technical University of Ostrava, 17. listopadu 15, 708 33, Ostrava - Poruba, Czech Republic

    D. Matýsek

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  1. V. Novák
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Correspondence to V. Novák.

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Novák, V., Raška, P., Matýsek, D. et al. Electrochemical characterization of fine-grained blast furnace sludge after acid leaching using carbon paste electrode. J Solid State Electrochem 22, 3457–3466 (2018). https://doi.org/10.1007/s10008-018-4056-2

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  • DOI: https://doi.org/10.1007/s10008-018-4056-2

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