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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Primary aluminium is produced by the Hall-Heroult process which is based on electrolysis in molten fluoride electrolyte, Na3AlF6-AlF3, at ∼960 °C 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.

Original languageEnglish
Title of host publicationECS Transactions
PublisherInstitute of Physics
Pages155-164
Number of pages10
Edition14
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2022
Event242nd ECS Meeting - Atlanta, United States
Duration: Oct 9 2022Oct 13 2022

Publication series

NameECS Transactions
Number14
Volume109
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference242nd ECS Meeting
Country/TerritoryUnited States
CityAtlanta
Period10/9/2210/13/22

ASJC Scopus subject areas

  • General Engineering

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