Design and performance of a laboratory cell for determination of current efficiency in the electrowinning of aluminium

Solli, P. A.; Eggen, Tor Gunnar; Rolseth, Sverre; Skybakmoen, Egil; Sterten, Å.

doi:10.1007/bf00242196

Cited by 19 publications

(8 citation statements)

References 2 publications

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“…Experiments were carried out in a laboratory cell originally designed by Solli et al (10) for current efficiency measurements during electrodeposition of liquid aluminum from molten fluoride-alumina electrolytes. The laboratory cell is schematically shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte

Haarberg¹,

Awayssa²,

Meirbekova³

et al. 2022

ECS Trans.

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Primary aluminium is produced by the Hall-Heroult process which is based on electrolysis in molten fluoride electrolyte, Na3AlF6-AlF3, at ~960 oC in which the raw material alumina is dissolved and decomposed into pure aluminium and CO2 gas due to the use of carbon anodes. Alloys are made by adding pure metals prior to the casting process. An alternative approach to produce alloys by co-deposition of alloying elements during electrolysis, where metal oxides of alloying elements are added to the electrolyte, is under study. Laboratory experiments were carried out to quantify the impact of co-deposition of alloying elements of titanium, manganese and silicon. Current efficiencies above 90 % and acceptable conversion of metal oxide to metal were obtained for electrodeposition of aluminium alloys with titanium, manganese and silicon. The proposed method for producing aluminium based alloys directly in the Hall-Heroult process may give substantial benefits in terms of cost and efficiency.

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Section: Methodsmentioning

confidence: 99%

Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte

Haarberg¹,

Awayssa²,

Meirbekova³

et al. 2022

ECS Trans.

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“…Experiments were carried out in a laboratory cell originally designed by Solli et al 16 for current efficiency measurements during electrodeposition. The laboratory cell is schematically illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Production of Al-Si Alloys in Cryolitic Melts in a Laboratory Cell

Awayssa

Sævarsdóttir

Meirbekova

et al. 2021

J. Electrochem. Soc.

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Direct production of aluminium-silicon alloy during aluminium electrolysis in fluoride-based melts was studied. Experiments were carried out in a laboratory cell dedicated to current efficiency measurements. Electrolysis was run at 960 °C, 970 °C, and 980 °C at a fixed cathodic current density (CCD) of 0.9 A cm−2 and a cryolite ratio (CR) of 2.2. Silicon content was up to 4 wt.% added via SiO2 precursor. SEM/EDX and ICP-MS were carried out for some of the deposits to characterize the solidified deposit surface of the produced metal and to estimate the current efficiency for Al-Si alloy. It was possible to produce alloys of at least 9.0 wt.% Si in Al with an estimated alloy current efficiency of approximately 63%. The presence of silica in the melt brought a rise in the recorded cell voltage which implies a lowering of the electrolyte conductivity.

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“…A laboratory cell developed by Solli 14,15 was used to determine the current efficiency for aluminium during electrolysis. The laboratory cell is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

The Behavior of Additives LiF, MgF₂ and KF on Current Efficiency in Aluminium Electrolysis

Cui

Qin

Haarberg

2019

J. Electrochem. Soc.

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The effects of LiF, MgF2 and KF additions to the electrolyte on current efficiency were investigated during aluminium electrolysis using base NaF AlF3 Al2O3 system with a cryolite ratio of 2.5, 4% Al2O3 and 5% CaF2 at 980°C in laboratory scale. The duration of each electrolysis experiment was 4 h with a graphite anode and a cathodic current density of 0.85 Acm −2 . The influences of various additives on the current efficiency of the aluminium electrolysis are compared. Additions of LiF up to 5 wt % were found to improve the current efficiency of aluminium deposition. Additions of MgF2 had a positive effect on current efficiency and KF addition was harmful for the current efficiency. Current efficiencies for aluminium deposition were obtained when the additions of LiF mixed together with the additions of KF and MgF2. The concentration of the alkali metals including K, Na and Li in deposited aluminium were analyzed as a function of the additives. Results are presented from a study of the influence of the additions on the cathode process. Correlations between the sodium content in aluminium with different additions and the current efficiency are discussed.

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Design and performance of a laboratory cell for determination of current efficiency in the electrowinning of aluminium

Cited by 19 publications

References 2 publications

Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte

Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte

Electrochemical Production of Al-Si Alloys in Cryolitic Melts in a Laboratory Cell

The Behavior of Additives LiF, MgF₂ and KF on Current Efficiency in Aluminium Electrolysis

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Design and performance of a laboratory cell for determination of current efficiency in the electrowinning of aluminium

Cited by 19 publications

References 2 publications

Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte

Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte

Electrochemical Production of Al-Si Alloys in Cryolitic Melts in a Laboratory Cell

The Behavior of Additives LiF, MgF2 and KF on Current Efficiency in Aluminium Electrolysis

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The Behavior of Additives LiF, MgF₂ and KF on Current Efficiency in Aluminium Electrolysis