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Separation and Extraction of Scandium and Iron from Bauxite Residue Using Hydrochloric Acid

*Berlian Sitorus orcid scopus publons  -  Department of Chemistry , Indonesia
Received: 12 Nov 2024; Published: 28 Feb 2025.
Open Access Copyright (c) 2025 Reaktor under http://creativecommons.org/licenses/by-nc-sa/4.0.

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Abstract

Scandium (Sc) is a strategic metal with increasing demand for advanced materials and technologies. Bauxite residue, a byproduct of alumina production, represents a potential source of Sc. However, the high iron content in bauxite residue hinders efficient Sc extraction. This study investigates the feasibility of Sc extraction from bauxite residue using hydrochloric acid (HCl) leaching, with and without the addition of ethylenediaminetetraacetic acid (EDTA) as a chelating agent. Bauxite residue samples were characterized using X-ray fluorescence (XRF) spectroscopy to determine their elemental composition. Subsequently, leaching experiments were conducted using 6M and 9M HCl solutions. The effect of EDTA on Sc extraction yield and iron dissolution was assessed. XRF analysis revealed significant iron content in the bauxite residue, confirming the necessity of effective iron removal. Leaching results demonstrated that 9M HCl without EDTA provided the optimal conditions for Sc extraction, yielding a higher Sc recovery compared to results obtained with 6M HCl and the use of EDTA. The addition of EDTA, while effective in chelating iron, also reduced Sc extraction efficiency. These findings contribute to the understanding of Sc extraction from bauxite residue and provide valuable insights for developing efficient and sustainable recovery processes.

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