Photo-switchable Collectors for the Flotation of Lithium Aluminate for the Recycling of the Critical Raw Material Lithium.

Autor: Zgheib A; Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstraße 6, D-38678, Clausthal-Zellerfeld, Germany., Fischer MH; Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstraße 6, D-38678, Clausthal-Zellerfeld, Germany., Namyslo JC; Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstraße 6, D-38678, Clausthal-Zellerfeld, Germany., Fittschen UEA; Clausthal University of Technology, Institute of Inorganic and Analytical Chemistry, Arnold-Sommerfeld-Straße 4, D-38678, Clausthal-Zellerfeld, Germany., Wollmann A; Clausthal University of Technology, Institute of Mechanical Process Engineering, Leibnizstraße 19, D-38678, Clausthal-Zellerfeld, Germany., Weber AP; Clausthal University of Technology, Institute of Mechanical Process Engineering, Leibnizstraße 19, D-38678, Clausthal-Zellerfeld, Germany., Schmidt A; Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstraße 6, D-38678, Clausthal-Zellerfeld, Germany.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2024 Sep 23; Vol. 17 (18), pp. e202301900. Date of Electronic Publication: 2024 May 21.
DOI: 10.1002/cssc.202301900
Abstrakt: Flotation of the mineral lithium aluminate by application of the natural product punicine from Punica granatum and some derivatives as collectors is examined. Punicines, 1-(2',5'-dihydroxyphenyl)-pyridinium compounds, are switchable molecules whose properties can be changed reversibly. They exist as cations, neutral mesomeric betaines, anions, and dianions depending on the pH. In light, they form radicals. Five punicine derivatives were prepared which possess β-methyl, β-chlorine, γ-tert.-butyl, and γ-acetyl groups attached to the pyridinium ring, and a pyrogallol derivative. On the other hand, LiAlO 2 reacts with water to give species such as LiAl 2 (OH) 7 on its surface. Flotations were performed applying the punicines in daylight (3000 lux), in darkness (<40 lux) and under UV-irradiation (4500 lux, 390-400 nm). The pH of the suspension, the collector's concentration, the conditioning time as well as the flotation time were varied. The recovery rates strongly depend on these parameters. For example, the recovery rate of lithium aluminate was increased by 116 % on changing the lighting condition from daylight to darkness, when the pyrogallol derivative of punicine was applied. UV, FTIR, TGA and zeta potential measurements as well as DFT calculations were performed in order to gain insight into the chemistry of punicines on the surface of LiAlO 2 and LiAl 2 (OH) 7 in water which influence the flotation's results.
(© 2024 The Authors. ChemSusChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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