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Application of Spent Coffee Grounds (SCGs) as a Fuel and Alternative Reducer of Slags from the Copper Industry

Author

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  • Tomasz Matula

    (Department of Metallurgy and Recycling, Faculty of Materials Science, Silesian University of Technology, Krasinskiego 8, 40-019 Katowice, Poland)

  • Jerzy Labaj

    (Department of Production Engineering, Faculty of Materials Science, Silesian University of Technology, Krasinskiego 8, 40-019 Katowice, Poland)

  • Krzysztof Nowacki

    (Department of Production Engineering, Faculty of Materials Science, Silesian University of Technology, Krasinskiego 8, 40-019 Katowice, Poland)

  • Leszek Blacha

    (Department of Metallurgy and Recycling, Faculty of Materials Science, Silesian University of Technology, Krasinskiego 8, 40-019 Katowice, Poland)

  • Lukasz Kortyka

    (Lukasiewicz Research Network—Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland)

  • Lukasz Mycka

    (Lukasiewicz Research Network—Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland)

  • Piotr Madej

    (Lukasiewicz Research Network—Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland)

  • Lukasz Jaworek

    (Lukasiewicz Research Network—Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland)

  • Tomasz Wojtal

    (Department of Metallurgy and Recycling, Faculty of Materials Science, Silesian University of Technology, Krasinskiego 8, 40-019 Katowice, Poland)

Abstract

This article presents the results of a study on metallurgical slag reduction using biomass such as Spent Coffee Grounds (SCGs). The proposed solution is a new aspect of searching for alternatives to standard reducers used in pyrometallurgical processes of metal production. Its gasification yields significant amounts of hydrocarbons, which are excellent reducing agents in such processes. The research results of copper slag reduction with the use of SCG biomass indicate this process is characterised by lower carbon dioxide emissions compared with the process using solid fuels such as coke and coke breeze. The addition of SCG as the reducer ensures the decrease in copper content in the slag to 0.32 wt.%, which corresponds to the increase of so-called relative decopperisation degree even up to 96.9%. As the decopperisation degree of slag increases, significantly more intense reduction in lead oxides during the reduction process is observed. The smallest lead content in waste slag of 0.91 wt.% was obtained for the slag reduction process with 7.56 wt.% of SCG as the reducer and the process duration of 1.5 h.

Suggested Citation

  • Tomasz Matula & Jerzy Labaj & Krzysztof Nowacki & Leszek Blacha & Lukasz Kortyka & Lukasz Mycka & Piotr Madej & Lukasz Jaworek & Tomasz Wojtal, 2023. "Application of Spent Coffee Grounds (SCGs) as a Fuel and Alternative Reducer of Slags from the Copper Industry," Energies, MDPI, vol. 16(5), pages 1-17, March.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:5:p:2415-:d:1086403
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    References listed on IDEAS

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    1. Afolabi, Oluwasola O.D. & Sohail, M. & Cheng, Yu-Ling, 2020. "Optimisation and characterisation of hydrochar production from spent coffee grounds by hydrothermal carbonisation," Renewable Energy, Elsevier, vol. 147(P1), pages 1380-1391.
    2. Bok, Jin Pil & Choi, Hang Seok & Choi, Yeon Seok & Park, Hoon Chae & Kim, Seock Joon, 2012. "Fast pyrolysis of coffee grounds: Characteristics of product yields and biocrude oil quality," Energy, Elsevier, vol. 47(1), pages 17-24.
    3. Battista, Federico & Barampouti, Elli Maria & Mai, Sofia & Bolzonella, David & Malamis, Dimitris & Moustakas, Konstantinos & Loizidou, Maria, 2020. "Added-value molecules recovery and biofuels production from spent coffee grounds," Renewable and Sustainable Energy Reviews, Elsevier, vol. 131(C).
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    Cited by:

    1. Lukasz Kortyka & Jerzy Labaj & Szymon Ptak & Albert Smalcerz & Leszek Blacha & Lukasz Mycka & Tomasz Matula & Robert Findorak, 2024. "A Study on the Potential for the Application of Peanut Shells as a Reducer in the Process of Metal Recovery from Metallurgical Slags," Sustainability, MDPI, vol. 16(21), pages 1-13, October.

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