Author
Listed:
- Srecko Stopic
(IME Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany)
- Richard Schneider
(IME Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany)
- Duško Kostić
(IME Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany
Faculty of Technology Zvornik, University of East Sarajevo, 75400 Zvornik, Republic of Srpska, Bosnia and Herzegovina)
- Isnaldi R. Souza Filho
(Max-Planck-Institut for Sustainable Materials, Max-Planck-Strasse 1, 40237 Duesseldorf, Germany
Institut Jean Lamour, French National Centre for Scientific Research (UMR 7198), Université de Lorraine, 54000 Nancy, France)
- Mitar Perušić
(Faculty of Technology Zvornik, University of East Sarajevo, 75400 Zvornik, Republic of Srpska, Bosnia and Herzegovina)
- Elif Emil-Kaya
(Department of Materials Science and Engineering, Norwegian University of Science and Technology, Høgskoleringen 1, 7034 Trondheim, Norway)
- Bernd Friedrich
(IME Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany)
Abstract
This study explores both pyrometallurgical and hydrometallurgical methods for decarbonizing and recovering valuable metals from bauxite residue, with hydrogen plasma reduction and direct acid leaching as the primary approaches. The goal is to offer innovative techniques for extracting metals from bauxite residue, a by-product of the Bayer process, which cannot be disposed of in an environmentally sustainable manner. Additionally, reducing the volume of bauxite residue through combined treatments is a key objective. In contrast to traditional carbon-based reductive melting, which generated significant CO 2 emissions, hydrogen is now being investigated as a cleaner alternative. Through hydrogen plasma reduction, approximately 99.9% of iron is recovered as crude metallic iron, which can be easily separated from the slag containing other valuable metals. Thermochemical analysis was used to predict slag formation and chemical analysis of slag during hydrogen reduction. To further recover metals like aluminum and titanium, the slag is subjected to sulfuric acid leaching under high-pressure of oxygen in an autoclave avoiding silica gel formation. The results demonstrated a leaching efficiency of 93.21% for aluminum and 84.56% for titanium, using 5 mol/L sulfuric acid at 150 °C, with almost complete iron recovery. Assisted ultrasound leaching of slag with sulphuric acid under atmospheric pressure leads to 54% leaching efficiency of titanium.
Suggested Citation
Srecko Stopic & Richard Schneider & Duško Kostić & Isnaldi R. Souza Filho & Mitar Perušić & Elif Emil-Kaya & Bernd Friedrich, 2025.
"Combined Decarbonizing Technologies for Treatment of Bauxite Residues,"
Waste, MDPI, vol. 3(2), pages 1-26, March.
Handle:
RePEc:gam:jwaste:v:3:y:2025:i:2:p:11-:d:1618788
Download full text from publisher
Corrections
All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jwaste:v:3:y:2025:i:2:p:11-:d:1618788. See general information about how to correct material in RePEc.
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
We have no bibliographic references for this item. You can help adding them by using this form .
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .
Please note that corrections may take a couple of weeks to filter through
the various RePEc services.