Cathodic behavior of graphite in KF-AlF3-based melts with various cryolite ratios

Liu, Dongren; Yang, Zhanhong; Li, Wangxing; Wang, Suqin; Wang, Shenwei

doi:10.1007/s10008-010-1135-4

Cited by 15 publications

(17 citation statements)

References 17 publications

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“…These are close to the D values obtained for graphite and platinum electrodes in previous works. 21,22 The addition of the solid Al 2 O 3 and increases in its content in the KF-AlF 3 -Al 2 O 3(sat) suspensions lead to decreasing D values at the same temperature. sen due to the lower liquidus temperature 19,29 and larger limit current densities at the same other conditions.…”

Section: 3kf-alf 3 -Almentioning

confidence: 99%

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Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Nikolaev

Suzdaltsev

Polyakov

et al. 2017

J. Electrochem. Soc.

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The kinetics of the cathode process on tungsten in KF-AlF 3-Al 2 O 3 melts and suspensions was studied by means of voltammetry and galvanostatic polarization. The effects of the temperature, [KF]/[AlF 3 ] ratio, Al 2 O 3 content on the kinetic parameters of electrowinning of aluminum from the KF-AlF 3-Al 2 O 3 melts and suspensions were determined. Introducing Al 2 O 3 slurry into the suspension and increasing its proportion make the diffusion of the electroactive ions to the cathode more difficult. The parameters for the suspension electrolysis were chosen on the basis of electrochemical measurements. The possibility of aluminum production during the electrolysis of KF-AlF 3-Al 2 O 3 suspension with 45 wt% Al 2 O 3 in the solid phase was demonstrated.

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Section: 3kf-alf 3 -Almentioning

confidence: 99%

“…[18][19][20] The results of the study supplement scarce data on the kinetics of aluminum electrowinning from KF-AlF 3 -Al 2 O 3 melts and suspensions. [21][22][23]…”

mentioning

confidence: 99%

Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Nikolaev

Suzdaltsev

Polyakov

et al. 2017

J. Electrochem. Soc.

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“…Processes on various anode materials in the melts are well studied, [21][22][23] while the available data on the cathode processes are contradictory and limited. 9,10,[24][25][26] The present work is devoted to studying kinetic features of the aluminum and scandium electrowinning from the KF-AlF 3 melts with the additions of Al 2 O 3 and Sc 2 O 3 during the synthesis of the Al-Sc master alloys.…”

mentioning

confidence: 99%

Electrowinning of Aluminum and Scandium from KF-AlF₃-Sc₂O₃ Melts for the Synthesis of Al-Sc Master Alloys

Nikolaev

Suzdaltsev

Zaikov

2019

J. Electrochem. Soc.

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The main kinetic features of the aluminum and scandium electrowinning during the electrolysis of the KF-AlF 3 -Al 2 O 3 -Sc 2 O 3 melts were studied by means of voltammetry, stationary polarization, as well as electrolysis. Aluminum electrowinning from the KF-AlF 3 -Al 2 O 3 melt on tungsten cathode occurs in the potential range from −0.1 to −1.3 V relative to the potential of the aluminum electrode. Replacing Al 2 O 3 by Sc 2 O 3 in KF-AlF 3 melts leads to a co-electrowinning of aluminum and scandium with the same kinetic parameters. Based on the electrochemical measurements, the parameters of stable galvanostatic electrolysis of the melts under study were selected and electrolysis tests were carried out to obtain Al-Sc master alloys. The cathode current efficiencies during co-electrowinning of aluminum and scandium on tungsten were evaluated, and the microstructure of the obtained Al-Sc master alloys was studied. A novel approach for the synthesis of the Al-Sc master alloys proposed that includes the electrolysis of the KF-AlF 3 -based melts with the addition of Al 2 O 3 and Sc 2 O 3 , electrowinning of aluminum and scandium on a solid cathode, and dissolution of formed cathode deposit in liquid aluminum.

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“…As the working temperature of the cell was above the boiling temperature of Na 1156 K (883°C), evaporation of the deposited Na occurs and the oxidation peak is less prominent. Deposition of Al is also reported in cryolite, [21,27] and can be a reason for the serration of the graph at larger overpotential. Oxidation of copper was observed at around 0.4 V, which dictated the anodic range of the potential window.…”

Section: Cyclic Voltammetry In Cryolitementioning

confidence: 77%

Determination of Cell Potential for Silicon Electrodeposition

Sokhanvaran

Danaei

Barati

2014

Metallurgical and Materials Transactions E

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Electrowinning of Si from cryolite-based melts is a possible solution for mass production of high purity silicon. The required cell potential to deposit Si on a cathode of interest, copper, is fundamental information that needs to be measured for controlling the co-deposition of impurities. In this study, the potential was measured using cyclic voltammetry in a cryolite-6 pct SiO 2 melt. The deposited Si on copper forms a Cu-Si alloy in which the activity of Si affects the decomposition potential. The measurements were carried out in a range of Si concentrations, allowing the prediction of potential change during the actual deposition process, where the Si content changes constantly. The results were compared with the values obtained from cyclic voltammetry on an inert electrode, graphite, to investigate if the formation of Cu-Si alloy is responsible for decreasing the potential.

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Cathodic behavior of graphite in KF-AlF3-based melts with various cryolite ratios

Cited by 15 publications

References 17 publications

Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Electrowinning of Aluminum and Scandium from KF-AlF₃-Sc₂O₃ Melts for the Synthesis of Al-Sc Master Alloys

Determination of Cell Potential for Silicon Electrodeposition

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Cathodic behavior of graphite in KF-AlF3-based melts with various cryolite ratios

Cited by 15 publications

References 17 publications

Cathode Process at the Electrolysis of KF-AlF3-Al2O3Melts and Suspensions

Cathode Process at the Electrolysis of KF-AlF3-Al2O3Melts and Suspensions

Electrowinning of Aluminum and Scandium from KF-AlF3-Sc2O3 Melts for the Synthesis of Al-Sc Master Alloys

Determination of Cell Potential for Silicon Electrodeposition

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Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Electrowinning of Aluminum and Scandium from KF-AlF₃-Sc₂O₃ Melts for the Synthesis of Al-Sc Master Alloys