Next Article in Journal
The Disappearance of Coal Seams Recorded in Associated Gangue Rocks in the SW Part of the Upper Silesian Coal Basin, Poland
Next Article in Special Issue
Creation of Backfill Materials Based on Industrial Waste
Previous Article in Journal
Burial and Thermal History Modeling of the Paleozoic–Mesozoic Basement in the Northern Margin of the Western Outer Carpathians (Case Study from Pilzno-40 Well, Southern Poland)
Previous Article in Special Issue
Production, Properties and Performance of Slag-Based, Geopolymer Foams
 
 
Article

Nepheline Syenite as an Alternative Source for Aluminum Production

1
School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece
2
Mytilineos SA-Metallurgy Business Unit, Alumina and Aluminium Plant, St Nikolas, 32003 Paralia Distomou, Greece
*
Authors to whom correspondence should be addressed.
Academic Editors: George Angelopoulos and Luis Pérez Villarejo
Minerals 2021, 11(7), 734; https://doi.org/10.3390/min11070734
Received: 15 June 2021 / Revised: 1 July 2021 / Accepted: 2 July 2021 / Published: 6 July 2021
(This article belongs to the Special Issue Valorization of Metallurgical and Mining Residues and Wastes)
The increasing demand for aluminum in conjunction with the limited available bauxite deposits in Europe results in the dire need for the evaluation of alternative raw materials for the whole value chain of alumina production. The present paper focuses on the possible use of nepheline syenite, originated as a mine byproduct, in alumina production through leaching with an azeotropic HCl solution. Previous work on nepheline syenite dissolution focused more on the extraction of potassium and sodium values. In this work, emphasis is given at the characteristics and leachability of aluminum content phases by applying a high temperature HCl leaching in untreated material. From this point of view, leaching experiments were conducted on nepheline syenite, at a temperature range of 90 °C to 150 °C and with aqueous azeotropic HCl solution. Leaching, in the aforementioned conditions, is a process, characterized by medium aluminum dissolution. The results show that the aluminum-bearing phases that withstand the dissolution process are mainly the ones of sodium and potassium feldspars. View Full-Text
Keywords: nepheline syenite; acid leaching; alternative alumina resources nepheline syenite; acid leaching; alternative alumina resources
Show Figures

Figure 1

MDPI and ACS Style

Bagani, M.; Balomenos, E.; Panias, D. Nepheline Syenite as an Alternative Source for Aluminum Production. Minerals 2021, 11, 734. https://doi.org/10.3390/min11070734

AMA Style

Bagani M, Balomenos E, Panias D. Nepheline Syenite as an Alternative Source for Aluminum Production. Minerals. 2021; 11(7):734. https://doi.org/10.3390/min11070734

Chicago/Turabian Style

Bagani, Maria, Efthymios Balomenos, and Dimitrios Panias. 2021. "Nepheline Syenite as an Alternative Source for Aluminum Production" Minerals 11, no. 7: 734. https://doi.org/10.3390/min11070734

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop