Electrorefining of aluminium scrap from chloride melts

Schwarz, V.; Wendt, H.

doi:10.1007/bf00251262

Cited by 16 publications

(4 citation statements)

References 5 publications

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“…Al-1.0, 3.0, and 5.0Cu casting alloy plates and Al-1.0, 3.0, and 5.0Cu cold-rolled plates were used as anode specimens. The casting alloy plates with dimensions of 175 × 175 × 34 mm 3 were produced by a semi-continuous (direct chill casting) method using 99.9% Al and Al-Cu matrix alloy. After that, they were cut to a thickness of 30 mm and ground flat on both sides.…”

Section: Methodsmentioning

confidence: 99%

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Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl₃ Ionic Liquid

Nunomura¹,

Matsushima²,

Kyo³

et al. 2022

ECS Trans.

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To produce high-purity Al from Al–Cu alloys, the dissolution behaviors of various Al–Cu binary alloy anodes in EmImCl–AlCl3 ionic liquid have been investigated at 323 K. In the constant potential electrolysis of the Al–5.0Cu casting alloy and cold-rolled plate at 0.3 V, Al atoms in the matrix phase were preferentially dissolved followed by the formation of Al2Cu surface species. The dissolution of both Al2Cu and Al in the alloy matrix occurred during electrolysis at 0.8 and 1.2 V. Moreover, a Cu-rich layer derived from Al2Cu was formed on the cold-rolled plate surface at a potential of 0.8 V and high electric charge densities. From the results, potential dependence of the anodic dissolution of the Al−Cu alloys in the ionic liquid was clarified.

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Section: Methodsmentioning

confidence: 99%

“…For Al purification, the authors of this work propose an electrorefining method using scrap Al as an anode. In previous studies, Al electrorefining was performed utilizing molten salts [2][3] and ionic liquids as electrolytes [4][5][6][7][8] , which considerably reduced the concentrations of various elements in Al scraps.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl₃ Ionic Liquid

Nunomura¹,

Matsushima²,

Kyo³

et al. 2022

ECS Trans.

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“…[17][18][19][20] In electrorefining with scrap Al, understanding the anodic dissolution behavior of additive alloy elements is essential. However, in previous studies on electrorefining methods using molten salts [21][22][23] or ionic liquids, [24][25][26][27] these anodic dissolution behaviors were not clarified. The authors clarified the processes involved in the anodic dissolution and electrorefining of Al-Si, 17 Al-Cu, 18 Al-Mn, 19 Al-Fe, and Al-Fe-Si alloys 20 as anodes using electrolytes at temperatures ranging from 323 to 423 K. Particularly, AlCl 3 -1-ethyl-3-methyl imidazolium chloride (EmImCl), obtained by mixing AlCl 3 and EmImCl, is capable of Al electrodeposition at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

NUNOMURA,

MATSUSHIMA,

KYO

et al. 2024

Electrochemistry

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The anodic dissolution reaction of Al-Zn alloys containing a Zn solid solution in Lewis acidic AlCl 3 -1-ethyl-3-methyl-imidazolium chloride (EmImCl) ionic liquids at various potentials is investigated herein. An enrichment layer was formed on the anode surface after applying constant potentials of 0.3 and 0.7 V in the 60 mol%AlCl 3 -40 %EmImCl (60 % AlCl 3 ) electrolyte and 0.2 V in the 67 mol%AlCl 3 -33 %EmImCl (67 %AlCl 3 ) electrolyte. Consequently, metallic Zn was detected in the enriched layer using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Notably, in the 60 %AlCl 3 electrolyte, high-purity Al was obtained at a much nobler potential than the dissolution potential of pure Zn, suggesting that the anodic dissolution of Zn from the Al-Zn alloy into the electrolyte was difficult. When electrorefining Al-Zn alloy anodes containing a Zn solid solution using 60 %AlCl 3 , which has lower acidity than the 67 %AlCl 3 electrolyte, it is possible to increase the anodic potential from 0.2 to 0.7 V. At this higher potential, high-purity Al is obtained at the cathode.

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“…We previously reported an electrorefining method for recycling Al scrap. [24][25][26] Recycling using the electrorefining method has been reported in attempts using molten salts [27][28][29] or ionic liquids as the electrolyte [30][31][32][33][34] however we focus particularly on methods that use low temperature ionic liquids as an electrolyte. Since this method requires less energy to maintain the bath temperature, the entire process is expected to be an energy-saving electrorefining method.…”

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confidence: 99%

Anodic Dissolution Behavior of Al Alloys Containing Al₆Fe or β-AlFeSi in EmImCl–AlCl₃ Electrolyte During Electrorefining

Nunomura,

Matsushima,

Kyo

et al. 2023

J. Electrochem. Soc.

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To produce over 99.9% of high-purity Al from Al alloys containing Al6Fe or β-AlFeSi through electrorefining, their anodic dissolution and cathodic electrodeposition characteristics should be clarified. In this study, the anodic dissolution and cathodic electrodeposition behavior of Al–Fe binary and Al–Fe–Si ternary alloys were investigated in an EmImCl–AlCl3 ionic liquid electrolyte at 323 K. Anodic polarization measurements, constant potential electrolysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), field-emission SEM (FE-SEM), and energy dispersive spectroscopy (EDS) were used to study the anode and electrodeposits on the cathode. Constant potential electrolysis showed that Fe dissolved from Al6Fe in the Al–Fe anode at 0.7 V vs Al/Al(III) and from β-AlFeSi in the Al–Fe–Si anode at 1.4 V and was co-deposited with Al on the cathode. Notably, Si did not dissolve from β-AlFeSi at either potential. A combination of controlled anodic dissolution potential and the use of the Al alloy containing β-AlFeSi further suppressed the dissolution and cathodic co-deposition of Fe, affording high-purity Al on the cathode. This suggests that Al alloys with intermetallic compounds that are less likely to dissolve Fe at the anode are optimal for obtaining over 99.9% of high-purity Al from Al alloys containing Fe in the electrorefining method.

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Electrorefining of aluminium scrap from chloride melts

Cited by 16 publications

References 5 publications

Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl₃ Ionic Liquid

Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl₃ Ionic Liquid

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

Anodic Dissolution Behavior of Al Alloys Containing Al₆Fe or β-AlFeSi in EmImCl–AlCl₃ Electrolyte During Electrorefining

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Electrorefining of aluminium scrap from chloride melts

Cited by 16 publications

References 5 publications

Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl3 Ionic Liquid

Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl3 Ionic Liquid

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

Anodic Dissolution Behavior of Al Alloys Containing Al6Fe or β-AlFeSi in EmImCl–AlCl3 Electrolyte During Electrorefining

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Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl₃ Ionic Liquid

Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl₃ Ionic Liquid

Anodic Dissolution Behavior of Al Alloys Containing Al₆Fe or β-AlFeSi in EmImCl–AlCl₃ Electrolyte During Electrorefining