Browsing NTNU Open by Author "Gylver, Sindre Engzelius"

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    • A Model Based Parametric Study of Alumina Feeding and Dissolution 

      Aase, Simen; Bekkevoll, Simen; Forberg, Sigmund A.K. (Bachelor thesis, 2020)
      Alumina blir brukt som råmateriale i den energikrevende Hall-Hèroult-prosessen for produksjon av aluminium. I denne prosessen blir aluminapulver matet til et kryolittbad med jevne mellomrom. Det utfordrende miljøet i den ...

    • Alumina Dissolution in Cryolite Melts - Formation and Behavior of Rafts 

      Gylver, Sindre Engzelius (Master thesis, 2018)
      Alumina is the raw-material used for aluminum production in the Hall-Héroult process. Though the process is used for several years, some phenomena is not fully investigated yet. One of those is the formation of floating ...

    • Alumina Dissolution in Cryolite Melts: Effects of Secondary Alumina Properties on Dissolution and Raft Formation 

      Bekkevoll, Simen (Master thesis, 2022)
      I Hall-Héroult prosessen som brukes til å produsere primær alumina, er oppløsning av råmaterialet alumina en av de viktigste delene av selve produksjonsprosessen. Et fenomen som ikke er fullt forstått enda innen oppløsning ...

    • Alumina feeding and raft formation: Raft collection and process parameters 

      Gylver, Sindre Engzelius; Omdahl, Nina Helene; Prytz, Ann Kristin; Meyer, Astrid Johanne; Lossius, Lorentz Petter; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2019)
      Alumina, alongside with electricity and carbon, is the raw material used for production of aluminium in the Hall-Héroult process. An efficient dissolution process is important to acquire stable conditions for the cell, ...

    • CFD Modelling of Alumina Feeding 

      Einarsrud, Kristian Etienne; Gylver, Sindre Engzelius; Manger, Eirik (Journal article, 2018)
      The dissolution and distribution of alumina in molten cryolite bath is a complex process, involving heat and mass transfer, phase transition and dynamics for a particle population with variable size and properties. Although ...

    • Feeding of Alumina in Molten Cryolite Bath 

      Gylver, Sindre Engzelius (Doctoral theses at NTNU;2023:21, Doctoral thesis, 2023)
      Alumina is the principal raw-material used for the production of aluminum in the Hall- Héroult process and is fed to the electrolytic bath in batches regularly. Maintaining a stable concentration in the bath is important ...

    • The Formation and Disintegration of Rafts from Different Aluminas and Fines 

      Gylver, Sindre Engzelius; Bekkevoll, Simen; Rørvik, Stein; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2022)
      Raft formation is a frequently encountered problem during alumina feeding in the Hall-Héroult-process and will delay alumina from being dissolved into the melt. The mechanisms for the formation and disintegration of rafts ...

    • Lab Scale Experiments on Alumina Raft Formation 

      Gylver, Sindre Engzelius; Solheim, Asbjørn; Gudbrandsen, Henrik; Follo, Åste Hegglid; Einarsrud, Kristian Etienne (Chapter, 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 ...

    • Modeling Alumina Feeding With the µ(I)-Rheology 

      Gylver, Sindre Engzelius; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2023)
      Efficient feeding and dissolution of alumina are necessary in order to maintain a stable Hall–Héroult process. One dose of alumina contains several thousand grains, and simulating the motion of individual particles is in ...

    • On Gaseous Emissions During Alumina Feeding 

      Gylver, Sindre Engzelius; Follo, Åste Hegglid; Aulie, Vegard; Granlund, Helene Marie; Sørhuus, Anders; Sandnes, Espen; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2021)
      Aluminium electrolysis involves feeding of alumina into a cryolite-based bath. Water originating from alumina as well as from air reacts with fluorides and results in HF evolution. Untreated HF gas is a significant ...

    • 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)
      As alumina particles are fed to aluminium reduction cells, a frozen layer of bath is typically formed on the particle surface, due to the relatively low bath superheat. For particles in close proximity, platelets with ...

    • A Water Model Study of Alumina Feeding and Dispersion 

      Gylver, Sindre Engzelius; Aase, Simen; Bekkevoll, Simen; Forberg, Sigmund Andres Kvammen; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2022)