• Alumina scale composition and growth rate in distribution pipes 

      Haugland, Ingrid Bokn; Kjos, Ole Sigmund; Røyset, Arne Karstein; Vullum, Per Erik; Aarhaug, Thor Anders; Halstensen, Maths (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2019)
      Scaling in distribution pipes for secondary alumina is a major issue in aluminium smelters. The scale is formed inside the distribution pipes, and gradually reduces the cross section that is available for alumina transport. ...
    • An Attempt to Estimate the Sulfuric Acid Dewpoint in the Flue Gas from Aluminium Electrolysis Cells 

      Solheim, Asbjørn (Peer reviewed; Journal article, 2022)
      The sulfuric acid dew point in the flue gas from aluminium electrolysis cells increases with increasing concentrations of sulfur dioxide and water vapour. This represents a potential problem in a future scenario with reduced ...
    • Bio-Binders and its Carbonization and Interaction with Petroleum Coke during Baking 

      Jahrsengene, Gøril; Rørvik, Stein; Støre, Anne; Wang, Liang; Skreiberg, Øyvind (Peer reviewed; Journal article, 2022)
      To reduce the carbon footprint in aluminium production, bio-based binders are suggested to replace some or all coal tar pitch in the carbon anodes. In this study, bio-binders based on Norwegian spruce and birch woods were ...
    • Carbon cathode wear in aluminium electrolysis cells 

      Senanu, Samuel; Wang, Zhaohui; Ratvik, Arne Petter; Grande, Tor (Journal article; Peer reviewed, 2019)
      Autopsies of six spent potlinings with different carbon cathode block grades, amperage regimes and cell technologies were conducted at three separate smelters to reveal possible mechanisms causing cathode wear. Microstructure ...
    • Compaction of aluminium foil and its effect on oxidation and recycling yield 

      Vallejo-Olivares, Alicia; Philipson, Harald; Gökelma, Mertol; Roven, Hans Jørgen; Furu, Trond; Kvithyld, Anne; Tranell, Gabriella (Peer reviewed; Journal article, 2021)
      One of the problems when recycling aluminium is its oxidation and consequent metal loss. This is especially critical for the thin sheet/foil materials used for food packaging applications. Compacting the scrap into briquettes ...
    • Discussion of bi-film index and LiMCA data in industrial aluminum remelting trials 

      Kvithyld, Anne; Sæter, Jan Anders; Syvertsen, Martin; Fossheim, Harry; Nordmark, Arne; Sottar, Ronny; Engh, Thorvald Abel (Peer reviewed; Journal article, 2018)
      The trend in the aluminum high end market is to set unrealistic quality requirements e.g. inclusion free metal. The importance of quality and the ability to measure is growing. LiMCA is a unique, well-established tool for ...
    • Effects of CO2 cover gas and yttrium additions on the oxidation of AlMg alloys 

      Smith, Nicholas Albert; Gleeson, Brian; wissam, saidi; Kvithyld, Anne; Tranell, Gabriella (Light Metals;2019, Chapter; Peer reviewed, 2019)
      AlMg alloys are known to suffer from problematic oxidation that can result in significant dross formation and loss of Mg from the melt. Historically, beryllium has been used to minimize the oxidation as it forms a protective ...
    • Electrochemical Behaviour of Carbon Anodes Produced with Different Mixing Temperatures and Baking Levels—A Laboratory Study 

      Sommerseth, Camilla; Thorne, Rebecca Jayne; Gebarowski, Wojciech; Ratvik, Arne Petter; Rørvik, Stein; Linga, Hogne; Lossius, Lorentz Petter; Svensson, Ann Mari (Light Metals;2019, Chapter; Peer reviewed, 2019)
      Anodes fabricated from a single source coke were used for investigations of effect of porosity and surface roughness on the electrochemical performance in laboratory scale cells. In order to fabricate anodes differing in ...
    • Formation of Carbon Build-Up on the Flue Wall of Anode Baking Furnace 

      Wang, Zhaohui; Rørvik, Stein; Ratvik, Arne Petter; Grande, Tor (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2017)
      A hard carbon build-up layer often forms on the flue wall surface in anode baking furnaces. The layer accumulates over thermal circles and needs to be mechanically removed regularly to ensure sufficient space for the anodes ...
    • Furnace Atmosphere and Dissolved Hydrogen in Aluminium 

      Syvertsen, Martin; Kvithyld, Anne; Gundersen, Eilif; Johansen, Inge; Engh, Thorvald Abel (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2019)
      Hydrogen solubility is much higher in liquid than in solid aluminium. Therefore, if the hydrogen concentration in liquid aluminium is too high prior to solidification, there is high risk of gas porosity formation during ...
    • Heavy Metal Emissions through Particulate Matter from Aluminium Electrolysis 

      Tranell, Maria Gabriella; Aarhaug, Thor Anders; Müller, Fride (Peer reviewed; Journal article, 2023)
      Heavy metal emissions from the aluminium industry are mainly carried from the plant through fugitive particulate matter (PM) originating from the aluminium electrolysis pot room. To evaluate the behaviour of metal-carrying ...
    • Investigation on scale formation in aluminium industry by means of a cold-finger 

      Clos, Daniel Perez; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth (Journal article; Peer reviewed, 2019)
      A cylindrical fouling probe or “cold-finger” has been used to investigate fouling from aluminium production off-gas. The probe was located upstream from the off-gas cleaning system. Surface deposits have been collected for ...
    • Measurement of anode anisotropy by micro x-ray computed tomography 

      Rørvik, Stein; Lossius, Lorentz Petter (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2019)
      Micro X-ray Computed Tomography (CT) is an instrumental method for recording inner structure 3D images without damaging the observed volume. A methodology has been developed by SINTEF for CT of carbonaceous materials, ...
    • On the Feasibility of Using Low-Melting Bath to Accommodate Inert Anodes in Aluminium Electrolysis Cells 

      Solheim, Asbjørn (Peer reviewed; Journal article, 2021)
      Inert anodes for aluminium production can be made of ceramics, metals, or a mixture of those (cermets). Regardless of the type of anode, the surface will be an oxide. With high enough anode potential, the surface oxide ...
    • Optical and Electrochemical Characterisation of Carbon Anodes with Varying Porosity and Coke Quality 

      Jahrsengene, Gøril; Farahani, Mahyar; Linga, Hogne; Svensson, Ann Mari (Peer reviewed; Journal article, 2022)
      The performance of carbon anodes in aluminium production will depend on both the coke quality (impurities, structure) and the physical properties of the anode (density, permeability, electric resistivity). Here, a set of ...
    • Reactivity of coke in relation to sulfur level and microstructure 

      Jahrsengene, Gøril; Rørvik, Stein; Ratvik, Arne Petter; Lossius, Lorentz Petter; Haverkamp, Richard G.; Svensson, Ann Mari (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2019)
      Shrinkage induced flow, thermo-solutal convection and equiaxed grain motion are the major transport mechanisms contributing to macrosegregation formation in aluminum alloys produced through Direct Chill casting. Experimental ...
    • The micro- and macrostructure of alumina rafts 

      Gylver, Sindre Engzelius; Nina Helene, Omdahl; Rørvik, Stein; Hansen, Ingrid; Nautnes, Andrea; Neverdal, Sofie Nilssen; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2019)
    • Thermogravimetric Analysis of Thermal Insulating Materials Exposed to Sodium Vapor 

      Luneng, Raymond; Wang, Zhaohui; Ratvik, Arne Petter; Grande, Tor (Journal article; Peer reviewed, 2019)
    • Wetting of Carbon Cathodes by Molten Electrolyte and Aluminium 

      Senanu, Samuel; Ratvik, Arne Petter; Wang, Zhaohui; Grande, Tor (Peer reviewed; Journal article, 2021)
      The extent to which the carbon cathode is wetted by molten electrolyte or molten aluminium metal is important for understanding the cathode wear during aluminium electrolysis. The present paper reports on a laboratory study ...