Preprint Article Version 1 This version is not peer-reviewed

Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology

Version 1 : Received: 14 March 2019 / Approved: 15 March 2019 / Online: 15 March 2019 (09:34:01 CET)

A peer-reviewed article of this Preprint also exists.

Lymperopoulou, T.; Georgiou, P.; Tsakanika, L.-A.; Hatzilyberis, K.; Ochsenkuehn-Petropoulou, M. Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology. Minerals 2019, 9, 236. Lymperopoulou, T.; Georgiou, P.; Tsakanika, L.-A.; Hatzilyberis, K.; Ochsenkuehn-Petropoulou, M. Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology. Minerals 2019, 9, 236.

Journal reference: Minerals 2019, 9, 236
DOI: 10.3390/min9040236

Abstract

Bauxite residue is the voluminous by-product of alumina production after Bayer process. Its high alkalinity causes disposal problems and harmful environmental impacts. However, the residue contains significant amounts of valuable elements such as rare earth elements including scandium. Greek bauxite residue contains a high amount of scandium close to its main resources. Taking into account scandium limited availability coupled with its high demand in modern technology, bauxite residue could be considered as a potential resource for scandium recovery. In this study, the optimization of scandium extraction from bauxite residue with sulfuric acid is investigated using Taguchi methodology. Based on previous studies acid molarity, leaching time, solid/liquid ratio and reaction temperature were selected as control parameters for the selective Sc recovery. Method optimization targeted the highest concentration of scandium combined with the lowest concentration of iron without taking into account applications constraints. The predicted values resulted by Taguchi methodology were affirmed by a confirmation experiment conducted at optimal conditions. Regression analysis provided the respective equations to be applied on several conditions depending on different applications.

Subject Areas

Taguchi method; experimental design; optimization; scandium; extraction; sulfuric acid

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