Browsing NTNU Open by Author "Saevarsdottir, Gudrun"
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Adapting Modern Industrial Operation Parameters in a Standardized Laboratory Cell for Measuring Current Efficiency for Aluminium Deposition: Unexpected Challenges and Lessons Learned
Meirbekova, Rauan; Awayssa, Omar; Haarberg, Geir Martin; Saevarsdottir, Gudrun (Journal article, 2020)“Current efficiency” is an important cell parameter which shows how efficiently current is used to produce aluminium. Operational parameters that affect current efficiency have been widely studied in the aluminium industry, ... -
Anodic Behaviour of Ni-Fe-Cu electrode In Molten Fluoride Salts
Saevarsdottir, Gudrun; Singh, Kamaljeet; Haarberg, Geir Martin; Bourmaud, M; Padamata, Sai Krishna (Peer reviewed; Journal article, 2022)The anodic behaviour of NixFeyCuz alloy at different sodium- and potassium-cryolite based electrolyte compositions was examined by chronopotentiometry, galvanostatic polarisation, and linear sweep voltammetry at 1098 K. ... -
Direct Production of Aluminum Titanium Alloys in Aluminum Reduction Cells: A Laboratory Test.
Haarberg, Geir Martin; Awayssa, Omar; Saevarsdottir, Gudrun; Meirbekova, Rauan; Xu, Wenting (Journal article, 2022)Aluminum smelters produce pure aluminum in reduction cells by the Hall-Héroult process, however, aluminum is usually supplied as a variety of alloys to their customers. The alloys are produced in the casthouse, as desired ... -
Dynamic Current and Power Distributions in a Submerged Arc Furnace
Tesfahunegn, Yonatan; Magnusson, Thordur; Tangstad, Merete; Saevarsdottir, Gudrun (Journal article; Peer reviewed, 2019)Most submerged arc furnaces used for the production of ferroalloys run on three-phase alternating current. This affects the electrical operation of the furnace and thus it is of interest to study alternating current ... -
Dynamic Current Distribution in the Electrodes of Submerged Arc Furnace Using Scalar and Vector Potentials
Tesfahunegn, Yonatan; Magnusson, Thordur; Tangstad, Merete; Saevarsdottir, Gudrun (Journal article; Peer reviewed, 2018)This work presents computations of electric current distributions inside an industrial submerged arc furnace. A 3D model has been developed in ANSYS Fluent that solves Maxwell’s equations based on scalar and vector potentials ... -
Electrodeposition of Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte
Haarberg, Geir Martin; Awayssa, Omar; Meirbekova, Rauan; Xu, Wenting; Saevarsdottir, Gudrun (Peer reviewed; Journal article, 2022)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 ... -
Electrodeposition of aluminium-titanium alloys from molten fluoride-oxide electrolytes
Awayssa, Omar; Saevarsdottir, Gudrun; Meirbekova, Rauan; Haarberg, Geir Martin (Peer reviewed; Journal article, 2021)This study reports the direct production of an aluminium-titanium alloy during aluminium electrolysis in fluoride-based melts. Experiments were conducted in a laboratory cell dedicated to current efficiency measurements. ... -
Influence of phosphorus on current efficiency in aluminum electrolysis at different current densities
Meirbekova, Rauan; Haarberg, Geir Martin; Thonstad, Jomar; Saevarsdottir, Gudrun (Journal article; Peer reviewed, 2017)Many factors may contribute to loss of current efficiency (CE) in aluminum reduction and one of them is a presence of impurities. In this work, the effect of phosphorus on CE is studied in a laboratory cell at different ... -
Primary Production of Aluminium and Its Alloys in Molten Salts with Oxygen Evolving Anodes: Overview
Padamata, Sai Krishna; Singh, Kamaljeet; Haarberg, Geir Martin; Saevarsdottir, Gudrun (Peer reviewed; Journal article, 2022)Due to environmental and economic concerns, carbon-free aluminium production has been an ultimate target for aluminium industries. For the last few decades, a considerable amount of research has been conducted to find a ... -
Reducing the Carbon Footprint: Primary Production of Aluminum and Silicon with Changing Energy Systems
Saevarsdottir, Gudrun; Magnusson, Thordur; Kvande, Halvor (Peer reviewed; Journal article, 2021)The world now pushes for a low-carbon future, and international goals for greenhouse gas emission reductions have been set. Industrial processes, including metallurgical processes, make up more than a fifth of the total ... -
Wettable TiB<inf>2</inf> Cathode for Aluminum Electrolysis: A Review
Padamata, Sai Krishna; Singh, Kamaljeet; Haarberg, Geir Martin; Saevarsdottir, Gudrun (Peer reviewed; Journal article, 2022)Titanium diboride (TiB2) is considered a promising material for wettable cathodes in aluminum electrolysis. The demand for wettable cathodes is associated with the development of inert anode technologies to eliminate CO2 ...