• A concept for electrowinning of aluminium using depolarized gas anodes 

      Mokkelbost, Tommy; Kjos, Ole Sigmund; Paulsen, Ove Bjørn; Øye, Bjarte Arne; Gudbrandsen, Henrik; Ratvik, Arne Petter; Haarberg, Geir Martin (Journal article; Peer reviewed, 2014)
      Aluminium is today commercially produced by the Hall-Héroult process using consumable carbon anodes. Consumable anodes have some concerns such as CO2 emission, continuous anodecathode distance adjustments and replacements ...
    • A study of anode baking gas composition 

      Aarhaug, Thor Anders; Brandvik, Trond; Kjos, Ole Sigmund; Gaertner, Heiko; Ratvik, Arne Petter (Journal article; Peer reviewed, 2018)
      A method has been developed to measure gas composition inside the pit in open anode baking furnaces. The gas composition can be used to understand attack on and degradation of the refractory lining, baking behavior and ...
    • Electrochemical production of titanium by using titanium oxycarbide anodes in molten salts 

      Kjos, Ole Sigmund (Doktoravhandlinger ved NTNU, 1503-8181; 2010:148, Doctoral thesis, 2010)
      New production routes for the production of titanium are strongly desired to reduce the costs and thereby increase the utilisation of titanium. In the present work the possibility to directly reduce and purify titanium ...
    • Electrode behaviors of Na-Zn liquid metal battery 

      Xu, Junli; Martinez, Ana Maria Cuellar; Osen, Karen Sende; Kjos, Ole Sigmund; Kongstein, Ole Edvard; Haarberg, Geir Martin (Journal article; Peer reviewed, 2017)
      The electroreduction processes on a Mo electrode in a Na-Zn liquid metal battery cell with a molten NaCl-CaCl2-ZnCl2 electrolyte were investigated at 565°C. The effect of the battery operating parameters on the loss rate ...
    • Gas Anodes Made of Porous Graphite for Aluminium Electrowinning 

      Khalaghi, Babak; Gudbrandsen, Henrik; Kjos, Ole Sigmund; Osen, Karen Sende; Paulsen, Ove; Mokkelbost, Tommy; Haarberg, Geir Martin (Journal article, 2017)
      One of the major downsides of the current aluminium production process is the high CO2 emission. One alternative is to replace the consumable carbon anodes with inert anodes so that oxygen evolves instead of CO2. Also PFC ...
    • Natural Gas Anodes of Porous Graphite for Aluminium Electrolysis 

      Khalaghi, Babak (Doctoral theses at NTNU;2017:266, Doctoral thesis, 2017)
      Aluminium is the second metal produced in the world in terms of quantity. It is produced in a multistage process. First, aluminium ore is converted to pure aluminium oxide. The second stage is an electrolysis process. In ...
    • Online monitoring of aluminium primary production gas composition by use of Fourier-transform infrared spectroscopy 

      Aarhaug, Thor Anders; Ferber, Alain Marc C; Kjos, Ole Sigmund; Gaertner, Heiko (Journal article; Peer reviewed, 2014)
      Online monitoring of aluminium primary production raw gas is challenging due to the high concentration of HF in the presence of water. Tunable Diode Laser (TDL) analyzers retrofitted with sapphire optical windows allow for ...
    • Perfluorocarbon Formation During Rare Earth Electrolysis 

      Osen, Karen Sende; Martinez, Ana Maria Cuellar; Gudbrandsen, Henrik; Støre, Anne; Sommerseth, Camilla; Kjos, Ole Sigmund; Aarhaug, Thor Anders; Gaertner, Heiko; Chamelot, Pierre; Gibilaro, Mathieu; Massot, Laurent (Journal article; Peer reviewed, 2018)
      A challenge during rare earth (RE) electrolysis is to avoid emissions of perfluorocarbon (PFC) green-house gases. The objective of this work was to study how to operate the RE electrolysis process with neither PFC formation ...
    • PFC evolution characteristics during aluminium and rare earth electrolysis 

      Kjos, Ole Sigmund; Solheim, Asbjørn; Aarhaug, Thor Anders; Osen, Karen Sende; Martinez, Ana Maria Cuellar; Sommerseth, Camilla; Gudbrandsen, Henrik; Støre, Anne; Gaertner, Heiko (Journal article; Peer reviewed, 2018)
      In addition to aluminium electrolysis, the electrolysis of rare earth (RE) metals from fluoride melts is a significant source of perfluorocarbon (PFC) emissions to the atmosphere. These processes have many similarities, ...
    • Porous Carbon Anodes for the Supply of Methane during Electrowinning of Aluminium 

      Khalaghi, Babak; Gudbrandsen, Henrik; Kjos, Ole Sigmund; Osen, Karen Sende; Mokkelbost, Tommy; Haarberg, Geir Martin (Chapter, 2016)
      One of the major downsides of the current aluminium production process is the high amount of CO2 e mission. One alternative is to replace the consumable carbon anodes with inert anodes so that oxygen evolves instead of CO2 ...