Blar i NTNU Open på forfatter "Meirbekova, Rauan"
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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, ... -
Direct Production of Aluminum Manganese and Silicon Alloys in Aluminum Reduction Cells: A Laboratory Test
Sævarsdottir, Gudrun Arnbjörg; Awayssa, Omar; Meirbekova, Rauan; Haarberg, Geir Martin (Journal article, 2022)Aluminum smelters produce pure aluminum in reduction cells by the Hall-Héroult process but supply a variety of alloys to their customers. The alloys are produced in the cast house, as master alloys containing the desired ... -
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 ... -
Electrochemical Co-Deposition of Alloying Elements during Aluminium Electrolysis in a Laboratory Cell
Awayssa, Omar Ratib (Doctoral theses at NTNU;2021:121, Doctoral thesis, 2021)Aluminium alloys are mainly produced by the so-called melt mixing at which an alloying element is added to the molten aluminium before casting. This approach suffers from several drawbacks such as the high requirements of ... -
Electrochemical Production of Al-Si Alloys in Cryolitic Melts in a Laboratory Cell
Awayssa, Omar Ratib; Sævarsdottir, Gudrun; Meirbekova, Rauan; Haarberg, Geir Martin (Peer reviewed; Journal article, 2021)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 ... -
Electrochemical production of Al–Mn alloys during the electrodeposition of aluminium in a laboratory cell
Awayssa, Omar Ratib; Haarberg, Geir Martin; Meirbekova, Rauan; Sævarsdottir, Gudrun (Peer reviewed; Journal article, 2021)This study reports the direct production of an aluminium–manganese alloy during aluminium electrolysis in fluoride-based melts. Experiments were conducted in a laboratory cell dedicated for current efficiency measurements. ... -
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. ... -
Impurities and Current Efficiency in Aluminum Electrolysis
Meirbekova, Rauan (Doctoral thesis at NTNU;2015:220, Doctoral thesis, 2015)Different factors can contribute to current efficiency loss in aluminum electrolysis and one of them is due to the presence of impurities. Concerns on impurities have been raised since decline in raw material quality and ... -
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 ... -
Investigation of Sodium Sulfate Additions into Cryolite-Alumina Melts
Meirbekova, Rauan; Haarberg, Geir Martin; Aarhaug, Thor Anders; Sævarsdóttir, Gudrun A. (Journal article, 2016)In the Hall-Héroult process, sulfur impurities may not only emit harmful gases but also reduce current efficiency. To better understand this process, the behaviour of sulfur compounds in a cryolite-alumina melt at 1253 K ...