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

Omar Awayssa; Gudrun Saevarsdottir; Rauan Meirbekova; Geir Martin Haarberg

doi:10.1149/1945-7111/abf40e

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

Omar Awayssa, Gudrun Saevarsdottir, Rauan Meirbekova, Geir Martin Haarberg

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

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.

Original language	English
Article number	046506
Journal	Journal of the Electrochemical Society
Volume	168
Issue number	4
DOIs	https://doi.org/10.1149/1945-7111/abf40e
Publication status	Published - Apr 2021
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/1945-7111/abf40e

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title = "Electrochemical Production of Al-Si Alloys in Cryolitic Melts in a Laboratory Cell",

abstract = "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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AU - Awayssa, Omar

AU - Saevarsdottir, Gudrun

AU - Meirbekova, Rauan

AU - Haarberg, Geir Martin

PY - 2021/4

Y1 - 2021/4

N2 - 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.

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

Abstract

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