Blar i SINTEF Open på forfatter "Rørvik, Stein"
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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 ... -
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 ... -
Bubble distribution in fused quartz crucibles studied by micro X-Ray computational tomography. Comparing 2D and 3D analysis
Paulsen, Ove; Rørvik, Stein; Muggerud, Astrid Marie Flattum; Juel, Mari (Peer reviewed; Journal article, 2019)Micro X-Ray computational tomography (µ-CT), has been applied to study the bubble distribution across the wall of fused quartz crucibles used for Czochralski pulling of monocrystalline silicon ingots for solar cells. Two ... -
Charcoal and Use of Green Binder for Use in Carbon Anodes in the Aluminium Industry
Sommerseth, Camilla; Darell, Ove; Øye, Bjarte Arne; Støre, Anne; Rørvik, Stein (The Minerals, Metals & Materials Series;2367-1181, Chapter; Peer reviewed, 2020)Carbon anodes for aluminium production are produced from calcined petroleum coke (CPC), recycled anode butts and coal tar pitch (CTP). The CO2 produced during anode consumption contributes to a substantial amount of the ... -
Comparing Anodic Bubble Behavior of Anodes from Anisotropic and Isotropic Cokes in Laboratory Scale Aluminum Electrolysis Cells
Sommerseth, Camilla; Thorne, Rebecca Jayne; Ratvik, Arne Petter; Rørvik, Stein; Linga, Hogne; Lossius, Lorentz Petter; Svensson, Ann Mari (Peer reviewed; Journal article, 2019)During production of aluminum in Hall-Héroult cells, carbon anodes electrochemically oxidize to form mainly CO2. The CO2 bubbles block the anode working surface during growth and coalescence, leading to cell voltage loss ... -
Effect of calcination temperature and time on properties of steam exploded pellets
Wang, Liang; Baldauf, Lukas; Skreiberg, Øyvind; Jahrsengene, Gøril; Rørvik, Stein (Peer reviewed; Journal article, 2022)Carbon anodes play an essential role in the production of primary aluminium. Currently fossil carbon is used for producing carbon anodes. Reducing the carbon utilization and replacing the fossil carbon are the main routes ... -
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 ... -
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 ... -
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 ... -
Investigation of gasification reactivity and properties of biocarbon at high temperature in a mixture of CO/CO2
Wang, Liang; Skreiberg, Øyvind; Smith, Nicholas Albert; Jayakumari, Sethulakshmy; Rørvik, Stein; Jahrsengene, Gøril; Turn, Scott (Peer reviewed; Journal article, 2023)Understanding the conversion behaviors of biocarbon under conditions relevant to industrial conditions is important to ensure proper and efficient utilization of the biocarbon for a dedicated metallurgical process. The ... -
Investigation of the properties and reactivity of biocarbons at high temperature in mixture of CO/CO2
Wang, Liang; Skreiberg, Øyvind; Smith, Nicholas Albert; Jayakumari, Sethulakshmy; Jahrsengene, Gøril; Rørvik, Stein; Turn, Scott (Peer reviewed; Journal article, 2022)The CO2 gasification reactivity of biocarbons produced from birch wood chips under different atmospheric and pressurised conditions was investigated in this work. The reactivity tests were conducted by using a Macro-TGA ... -
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, ... -
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)