Browsing Institutt for materialteknologi by Title

Now showing items 2439-2458 of 2504

    • The use of hydrogen as a potential reductant in the chromite smelting industry 

      Davies, Jamey; Paktunc, Dogan; Ramos-Hernandez, José Juan; Tangstad, Merete; Ringdalen, Eli; Beukes, Johan P.; Bessarabov, Dmitri G.; Du Preez, Stephanus P. (Peer reviewed; Journal article, 2022)
      The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction of chromite ore. Ever-increasing pressure on FeCr producers to ...

    • Using AERMOD to predict the dispersion of emissions from the aluminum industry 

      Nilsen, Mads Urang (Master thesis, 2022)
      Økt fokus på de miljøskadelige effektene av utslipp har gitt opphav til strengere krav i sammenheng med utsippskontroll i aluminiumsindustrien. Derfor ønsker industrien å innføre effektive måter å estimere dispersjonen av ...

    • Using Surplus Heat to Pre-Heat Carbon Anodes for Aluminium Electrolysis 

      Grimstad, Martin (Master thesis, 2019)
      Karbon anoder brukes opp i Hall-Héroult prosessen og må erstattes regelmessig. Når en ny anode blir plassert i aluminiumsovnen, vil badet umiddelbart fryse på undersiden av anoden og danne et fryst isolerende lag. Denne ...

    • Utherdbare bimetall materialer fremstilt ved skrueekstrudering: AA 6060/ren magnesium 

      Mauland, Eirik (Master thesis, 2013)
      Skruekstrudering er en ny, innovativ prosess for å fremstille metaller. Prosessens store fortrinn er et relativt lav energiforbruk sammenliknet med tradisjonell ekstrudering, noe som i dagens energisamfunn er meget aktuelt. ...

    • The Utilization of Bauxite Residue with a Calcite-Rich Bauxite Ore in the Pedersen Process for Iron and Alumina Extraction 

      Lazou, Adamantia; Eijk, Casper van der; Tang, Kai; Balomenos, Efthymios; Kolbeinsen, Leiv; Safarian, Jafar (Peer reviewed; Journal article, 2021)
      Metallurgical grade alumina is produced worldwide through the well-known Bayer process, which unavoidably generates bauxite residue (BR, also known as red mud) in almost equal amounts to alumina. This study aims the ...

    • Utilization of Recycled Concrete Fines for Carbon Capture and Subsequent Use as Supplementary Cementitious Material 

      Björklund, Ronja Erika (Master thesis, 2022)
      Betong är det vanligaste byggmaterialet i världen, men cementproduktionen står för 5-7 % av det totala CO2-utsläppet. [26] För att minska mängden CO2 från tillverkningen blandas ofta cement med mineraliskt tillsatsmaterial ...

    • Utilization of waste heat for pre-heating of anodes 

      Einarsrud, Kristian Etienne; Grimstad, Martin; Elstad, Kim Ronny; Solheim, Asbjørn (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 ...

    • Utlekking av kjemikalier fra plastprodukter i vann 

      Christensen, Maren Morken; Haraldsvik, Martin (Bachelor thesis, 2021)
      I dagens samfunn er marin plastforsøpling blitt et økende problem og det er mye usikkerhet rundt hva slags miljøkonsekvenser dette medfører. Et komplett plastprodukt blir tilført karakteristiske kjemikalier, med den hensikt ...

    • Utmatting av AA6005 - Effekten av forskjellige tilstander 

      Tunestam, Per Fredrik (Master thesis, 2016)
      The aim of this thesis is to investigate the effect of ageing, both natural and artificial, at room temperature on the fatigue properties of AA6005. Artificial ageing was done to reach a temper state of equal hardness on ...

    • Utvikling av metode for bråkjøling i SEM og in situ EBSD-karakterisering av fasetransformasjoner i F 70 stål. 

      Sætran, Truls Gruben (Master thesis, 2012)
      Fasetransformasjoner som skjer ved sveising av F 70 arktisk stål fører til at ugunstige mikrostrukturer oppstår i den varmepåvirkede sonen av grunnmaterialet (HAZ). Ved gjentatt oppvarming av HAZ vil det kunne dannes områder ...

    • Utvikling av metode for produksjon av cellulære mikrogranulater fra glassavfall 

      Andersen, Jonas Grov; Brendryen, Håkon; Leivseth, Eirik (Bachelor thesis, 2022)
      Formålet med oppgaven er å finne ett sett med prosessbetingelser for å ekspansjon av cellulære mikrogranulater i størrelsesområdet 20-90 μm i en vertikal ovn med en oppadgående gasstrøm. De cellulære mikrogranulatene skal ...

    • Vacuum and Gas Refining of Silicon for Solar Cell Applications 

      Kermani, Arman Hoseinpur (Doctoral theses at NTNU;2021:244, Doctoral thesis, 2021)
      In this research, the vacuum and gas refining for P and B removal from Si to reach solar grade silicon (SoG – Si) are studied. The vacuum refining process is modeled by applying the Hertz – Knudsen – Langmuir evaporation ...

    • Vacuum evaporation of pure metals 

      Safarian, Jafar; Engh, Thorvald Abel (Journal article; Peer reviewed, 2013)
      Theories on the evaporation of pure substances are reviewed and applied to study vacuum evaporation of pure metals. It is shown that there is good agreement between different theories for weak evaporation, whereas there ...

    • Vacuum refining of silicon at ultra-high temperatures 

      Hoseinpur Kermani, Arman; Safarian, Jafar (Peer reviewed; Journal article, 2020)
      In the production of solar grade silicon (SoG-Si), Phosphorus (P) removal from Si is a challenge as it cannot be eliminated effectively by the final key directional solidification step in the value chain of the silicon ...

    • Validation and comparison of irradiation models for bifacial solar systems in the Nordics 

      Thorning, Jacob Krum (Master thesis, 2022)
      Abstract will be available on 2024-06-08

    • Validation of an Agilent GC-MS System With a Polyarc-FID 

      Rydså, Solfrid Margrete (Bachelor thesis, 2021)
      Validering av en Agilent 8890 gasskromatograf (GC) med massespektrometer (MS), en polyarc-reaktor og flammeionisasjonsdetektor (FID) ble utført for oppdragsgiver, for å forsøke å oppnå en akkreditert metode for ...

    • Valorization of aluminum dross with copper via high temperature melting to produce al-cu alloys 

      Kudyba, Artur; Akhtar, Shahid; Johansen, Inge; Safarian, Jafar (Peer reviewed; Journal article, 2021)
      The valorization of aluminum dross for Al recovery was performed via its mixing with metallic copper to produce Al-Cu alloys. This approach was with the intention of establishing a new smelting process to treat the dross ...

    • Valorization of SiMn Sludge for Production of Low-Phosphorus Ferroalloys 

      Wallin, Maria; Bugten, Andreas Voll; Tranell, Gabriella; Ekstrøm, Kai Erik (Journal article; Peer reviewed, 2021)
      The sludge generated by wet scrubbing the off-gas from a silicomanganese plant in Norway represents a significant loss in silicon and manganese values. This work seeks to extract these values in the production of ferroalloys ...

    • Van der Waals density functional study of the energetics of alkali metal intercalation in graphite 

      Wang, Zhaohui; Selbach, Sverre Magnus; Grande, Tor (Journal article; Peer reviewed, 2014)
      We report on the energetics of intercalation of lithium, sodium and potassium in graphite by density functional theory using recently developed van der Waals (vdW) density functionals. First stage intercalation compounds ...

    • 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 ...