Preparing Aluminum‐Scandium Alloys Using Direct Hall Reduction Process

Guan, Chunyang; Xue, Junmin; Zhu, Jun; Liu, Qiaochu

doi:10.1002/9781118364987.ch30

Cited by 11 publications

(1 citation statement)

References 5 publications

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“…The production of the Al-Sc master alloys using rather cheap Sc 2 O 3 in the alumina reduction cells seems to be more profitable, because this way excludes such operations as cooling, transportation, and subsequent heating of the obtained pure aluminum as well as does not demand an additional reactor for the Al-Sc master alloys production. 7,8 This technology is characterized by high temperature (950-960°C), low degree of the scandium extraction, presence of the excess hazardous gaseous products, and low common energy-efficiency.…”

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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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confidence: 99%