Browsing SINTEF Open by Author "Solheim, Asbjørn"

Now showing items 1-18 of 18

    • 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 ...

    • Biocarbon in the Aluminium Industry: A Review 

      Senanu, Samuel; Solheim, Asbjørn (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2021)
      Reduced fossil carbon footprint is currently a hot topic in the metal-producing industries. Replacement of fossil carbon with bio-based equivalents is thus an important topic also for the primary aluminium industry. Several ...

    • Cathode Wear in Electrowinning of Aluminum Investigated by a Laboratory Test Cell 

      Wang, Zhaohui; Nobakhtghalati, Saeid; Støre, Anne; Solheim, Asbjørn; Tschöpe, Kati; Ratvik, Arne Petter; Grande, Tor (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2016)
      The lifetime of an aluminum electrolysis cell is mainly determined by the cathode wear, especially for high amperage cells utilizing graphitized carbon cathodes. The cathode wear mechanisms are, however, complex and still ...

    • Effect of composition and temperature on current efficiency for aluminium electrolysis from cryolite-based molten alumina electrolytes 

      Morishige, Taiki; Haarberg, Geir Martin; Gudbrandsen, Henrik; Skybakmoen, Egil; Solheim, Asbjørn; Takenaka, Toshihide (Peer reviewed; Journal article, 2017)
      The current efficiency (CE) for aluminium electrolysis in modern cells can be as high as 96 %. The main reason for loss in current efficiency is the so-called back reaction between dissolved metal and the anode product of ...

    • Electrolyte Melt Compositions for Low Temperature Molten Carbonate Thermocell 

      Kandhasamy, Sathiyaraj; Solheim, Asbjørn; Kjelstrup, Signe; Haarberg, Geir Martin (Journal article, 2018)
      Industrial processes for the production of metals and alloys by metallurgical and electrochemical methods generate a great deal of waste heat due to irreversible losses. This waste heat may be used as a power source to ...

    • Gas electrodes with nickel based current collectors for molten carbonate electrolyte thermo-electrochemical cells 

      Kandhasamy, Sathiyaraj; Haarberg, Geir Martin; Kjelstrup, Signe; Solheim, Asbjørn (Peer reviewed; Journal article, 2019)
      Thermo-electrochemical cells with inexpensive molten carbonate electrolyte and (CO2|O2) gas electrodes allow the possible conversion of high temperature waste heat from industrial processes into electricity. The cell ...

    • Influence of electrode gas flow rate and electrolyte composition on thermoelectric power in molten carbonate thermocell 

      Kandhasamy, Sathiyaraj; Calandrino, Luca; Burheim, Odne Stokke; Solheim, Asbjørn; Kjelstrup, Signe Helene; Haarberg, Geir Martin (Peer reviewed; Journal article, 2016)
      A thermocell (thermo-electrochemical cell) is an electrochemical system with two identical electrodes placed at different temperatures in an electrolyte solution. Ion transport between the electrodes due to the temperature ...

    • Influence of Electrode Gas Flow Rate and Solid Oxide Ratio in Electrolyte on the Seebeck Coefficient of Molten Carbonate Thermocell 

      Kandhasamy, Sathiyaraj; Calandrino, Luca; Burheim, Odne Stokke; Solheim, Asbjørn; Kjelstrup, Signe; Haarberg, Geir Martin (Peer reviewed; Journal article, 2017)

    • Lab Scale Experiments on Alumina Raft Formation 

      Gylver, Sindre Engzelius; Solheim, Asbjørn; Gudbrandsen, Henrik; Follo, Åste Hegglid; Einarsrud, Kristian Etienne (The Minerals, Metals & Materials Series;2367-1181, Chapter; Peer reviewed, 2020)
      During feeding of alumina into a Hall-Héroult cell, rafts floating on the bath surface may be formed. In this study, rafts were created in a laboratory furnace by adding 4 g secondary alumina in industrial bath. Samples ...

    • Mass- and Heat Transfer during Dissolution of Alumina 

      Solheim, Asbjørn; Skybakmoen, Egil (The Minerals, Metals & Materials Series;2367-1181, Chapter; Peer reviewed, 2020)
      Dissolution of alumina in industrial aluminium cells is a complicated process, not least because it involves formation of agglomerates, and it involves mass- and heat transfer phenomena taking place simultaneously. In the ...

    • On pragmatism in industrial modeling 

      Zoric, Josip; Johansen, Stein Tore; Einarsrud, Kristian Etienne; Solheim, Asbjørn (SINTEF Proceedings;1, Chapter, 2015)
      Many natural or industrial processes are of extreme complexity, and where the time- and length scales range from an atomistic level to years and kilometers. Often the processes or phenomena consist of multiple sub processes ...

    • 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 ...

    • 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 (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 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, ...

    • 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)

    • Reactivity of CaO with CO2 in molten CaF2–NaF: formation and decomposition of carbonates 

      Tomkute, Viktorija; Solheim, Asbjørn; Sakirzanovas, Simas; Olsen, Espen (Journal article; Peer reviewed, 2016)

    • Recycling of the Flue Gas from Aluminium Electrolysis Cells 

      Solheim, Asbjørn; Senanu, Samuel (The Minerals, Metals & Materials Series;2367-1181, Chapter; Peer reviewed, 2020)
      Recycling of the flue gas from aluminium reduction cells is a possible method for increasing the CO2 concentration, thereby enabling CO2 capture. The present paper represents a preliminary study concerning some of the ...

    • Separation of Aluminum from More Noble Elements in an Electrolysis Cell with Side-by-Side Geometry 

      Solheim, Asbjørn; Kjos, Ole Sigmund; Skybakmoen, Egil; Gudbrandsen, Henrik (Peer reviewed; Journal article, 2021)
      Currently, recycled metal is diluted with primary metal to keep the concentration of alloying elements within specification. This will be more difficult in the future, when a larger proportion of the metal is made from ...

    • Utilization of waste heat for pre-heating of anodes 

      Grimstad, Martin; Elstad, Kim Ronny; Solheim, Asbjørn; Einarsrud, Kristian Etienne (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2020)
      Carbon anodes are replaced on a regular basis in Hall–Héroult cells as they are consumed by electrochemical reactions. Upon insertion of new anodes, bath will freeze locally as a result of low bath superheat and comparatively ...