Electrochemical Reduction and Dissolution of Aluminium in a Thin-Layer Refinery Process

Yasinskiy, Andrey; Polyakov, P. V.; Moiseenko, Ilya; Padamata, Sai Krishna

doi:10.1007/978-3-030-65396-5_73

Cited by 4 publications

(2 citation statements)

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“…The second section acts as a refinery cell with (1:1) NaCl-KCl-5 wt.% AlF 3 melt, where the dissolution followed by reduction of aluminium at the liquid aluminium cathode takes place. 8,9 The PGM concentration increases with time due to the equal partial currents of aluminium cathodic reduction and the anodic dissolution at the LBE.…”

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confidence: 99%

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

Padamata

Yasinskiy

Polyakov

2021

J. Electrochem. Soc.

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Electrochemical behaviour of aluminium ions from the Pt/γ-Al2O3 spent catalyst in the eutectic [LiF (63.6 wt.%)–AlF3 (36.4 wt.%)]eutectic−5 wt.% CaF2 melt was studied by the means of cyclic voltammetry, chronopotentiometry and chronoamperometry methods. Tungsten rod (diameter 2 mm) was used as a working electrode. The XRD method was used to study the composition of melt collected near the working electrode and the spent catalyst. The aluminium reduction kinetics was studied concerning varying parameters like spent catalyst content in the melt and the temperature. The reduction of Al3+ ions on the tungsten electrode changed from diffusion-controlled to quasi-reversible process. The charge transfer coefficient and the diffusion coefficient were calculated from the data obtained from the above-mentioned methods. The estimated diffusion activation energy was 117.85 kJ.mole−1.

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confidence: 99%

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

Padamata

Yasinskiy

Polyakov

2021

J. Electrochem. Soc.

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“…The first section acted as an electrolysis cell with the MF-AlF 3 (M = Li, K) electrolyte containing spent catalyst, where the catalyst carriers decomposed into aluminum and oxygen while the PGMs were accumulated in aluminum. The second section acted as a refinery cell with the NaCl-KCl-AlF 3 melt, where the dissolution followed by reduction of aluminum at the liquid aluminum cathode took place [21]. The PGM concentration in the bipolar electrode increased with time.…”

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Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Yasinskiy

Padamata

Stopić

et al. 2021

Metals

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Electrochemical decomposition of spent catalyst dissolved in molten salts is a promising approach for the extraction of precious metals from them. This article reports the results of the study of aluminum electrowinning from the xLiF–(1-x)AlF3 melt (x = 0.64; 0.85) containing 0–5 wt.% of spent petroleum Pt/γ-Al2O3 catalyst on a tungsten electrode at 740–800 °C through cyclic voltammetry and chronoamperometry. The results evidence that the aluminum reduction in the LiF–AlF3 melts is a diffusion-controlled two-step process. Both one-electron and two-electron steps occur simultaneously at close (or same) potentials, which affect the cyclic voltammograms. The diffusion coefficients of electroactive species for the one-electron process were (2.20–6.50)∙10−6 cm2·s–1, and for the two-electron process, they were (0.15–2.20)−6 cm2·s−1. The numbers of electrons found from the chronoamperometry data were in the range from 1.06 to 1.90, indicating the variations of the partial current densities of the one- and two-electron processes. The 64LiF–36AlF3 melt with about 2.5 wt.% of the spent catalysts seems a better electrolyte for the catalyst treatment in terms of cathodic process and alumina solubility, and the range of temperatures from 780 to 800 °C is applicable. The mechanism of aluminum reduction from the studied melts seems complicated and deserves further study to find the optimal process parameters for aluminum reduction during the spent catalyst treatment and the primary metal production as well.

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Electrowinning of Al-Sc Master Alloys in the LiF-AlF3-Sc2O3 Melts

Yasinskiy,

Moiseenko,

Varyukhin

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Electrochemical Reduction and Dissolution of Aluminium in a Thin-Layer Refinery Process

Cited by 4 publications

References 30 publications

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Electrowinning of Al-Sc Master Alloys in the LiF-AlF3-Sc2O3 Melts

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Electrochemical Reduction and Dissolution of Aluminium in a Thin-Layer Refinery Process

Cited by 4 publications

References 30 publications

The Cathodic Behavior of Aluminum from Pt/Al2O3 Catalysts in Molten LiF-AlF3-CaF2 and Implications for Metal Recovery from Spent Catalysts

The Cathodic Behavior of Aluminum from Pt/Al2O3 Catalysts in Molten LiF-AlF3-CaF2 and Implications for Metal Recovery from Spent Catalysts

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Electrowinning of Al-Sc Master Alloys in the LiF-AlF3-Sc2O3 Melts

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The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts