Browsing NTNU Open by Author "Jahrsengene, Gøril"

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    • A XANES Study of Sulfur Speciation and Reactivity in Cokes for Anodes Used in Aluminum Production 

      Jahrsengene, Gøril; Wells, Hannah C.; Rørvik, Stein; Ratvik, Arne Petter; Haverkamp, Richard G.; Svensson, Ann Mari (Journal article; Peer reviewed, 2018)
      Availability of anode raw materials in the growing aluminum industry results in a wider range of petroleum cokes being used to produce carbon anodes. The boundary between anode grade cokes and what previously was considered ...

    • An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production 

      Jahrsengene, Gøril; Wells, Hannah C.; Sommerseth, Camilla; Ratvik, Arne Petter; Lossius, Lorentz Petter; Sizeland, Katie H.; Kappen, Peter; Svensson, Ann Mari; Haverkamp, Richard G. (Journal article; Peer reviewed, 2019)
      Lower-quality petroleum coke with higher levels of sulfur and metal impurities will have to be used for the manufacturing of anodes for aluminum production in the future. The sulfur and metallic impurities affect the anode ...

    • Coke Impurity Characterisation and Electrochemical Performance of Carbon Anodes for Aluminium Production 

      Jahrsengene, Gøril (Doctoral theses at NTNU;2019:352, Doctoral thesis, 2019)
      The aluminium production process uses consumable carbon anodes made from calcined petroleum cokes, recycled anode butts and coal tar pitch. The main ingredient is the coke, a side product from the petroleum refining industry. ...

    • EBSD Microstructure Characterization of 9% Nickel Steel during In Situ Heat Treatment 

      Jahrsengene, Gøril (Master thesis, 2015)
      The austenite content in 9% Ni steel was investigated with EBSD during and after in situ heating to different temperatures in the two phase region of the phase diagram, after first obtaining a coarse grained HAZ using weld ...

    • EBSD Quantification of Retained Austenite in 9% Ni Steel Related to Thermal Treatments 

      Jahrsengene, Gøril; Wenn, Maia; Karlsen, Morten; Westermann, Ida; Akselsen, Odd Magne; Hjelen, Jarle (Chapter, 2015)
      The present work has been to study the effect of different finalizing preparation techniques on the amount of retained austenite measured with Electron Backscatter Diffraction (EBSD) and X-Ray-Diffraction (XRD) analysis. ...

    • 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 (Journal article; Peer reviewed, 2019)
      The quality of coke materials available for anodes for the aluminium industry is changing and industrial cokes with higher impurity levels are now introduced. The cokes in the anodes must meet specifications with respect ...

    • Vanadium Speciation in Petroleum Cokes for Anodes used in Aluminium Electrolysis 

      Jahrsengene, Gøril; Wells, Hannah C.; Sommerseth, Camilla; Ratvik, Arne Petter; Lossius, Lorentz Petter; Haverkamp, Richard G.; Svensson, Ann Mari (Journal article, 2017)
      The expanding aluminium industry is facing challenges with availability in raw materials. A wider range of petroleum cokes are being taken into use, blurring the border between anode grade and fuel grade coke in anode ...