Browsing NTNU Open by Author "Tranell, Gabriella"

Now showing items 21-40 of 93

    • Effect of Magnesium Addition on Removal of Impurities from Silicon by Hydrometallurgical Treatment 

      Espelien, Stine; Tranell, Gabriella; Safarian, Jafar (Chapter, 2017)
      Hydrometallurgical treatment of silicon is an effective process for the removal of metallic impurities for producing solar grade silicon feedstock. In the present research, the removal of impurities from silicon is studied ...

    • Effect of Magnesium Addition on Removal of Impurities from Silicon by Hydrometallurgical Treatment 

      Espelien, Stine; Tranell, Gabriella; Safarian, Jafar (Chapter, 2017)
      Hydrometallurgical treatment of silicon is an effective process for the removal of metallic impurities for producing solar grade silicon feedstock. In the present research, the removal of impurities from silicon is studied ...

    • Effects of CO2 cover gas and yttrium additions on the oxidation of AlMg alloys 

      Smith, Nicholas Albert; Gleeson, Brian; wissam, saidi; Kvithyld, Anne; Tranell, Gabriella (Chapter, 2019)
      AlMg alloys are known to suffer from problematic oxidation that can result in significant dross formation and loss of Mg from the melt. Historically, beryllium has been used to minimize the oxidation as it forms a protective ...

    • Element distribution in the silicomanganese production process 

      Ma, Yan; Moosavi-Khoonsari, Elmira; Kero, Ida; Tranell, Gabriella (Journal article; Peer reviewed, 2018)
      A pilot scale, silicomanganese alloy production campaign was performed in a 440 kVA, single phase electric furnace in order to establish an overview of the minor- and trace element contents in process input raw materials ...

    • Evaluation of the Effect of CO2 Cover Gas on the Rate of Oxidation of an AlMgSi Alloy 

      Solem, Cathrine Kyung Won; Ekstrøm, Kai Erik; Tranell, Gabriella; Aune, Ragnhild Elizabeth (Journal article, 2020)
      Small additions of beryllium (Be) to aluminum magnesium (AlMg) alloys have proven to decrease their oxidation rate during industrial liquid metal handling. As Be can cause respiratory health issues, it is desirable to ...

    • Evaporation and diffusion of Mn in inert systems 

      Olsen, Håkon Aleksander Hartvedt; Andersson, Stefan; Tranell, Gabriella (Journal article; Peer reviewed, 2018)
      This research is aimed to improve our knowledge on the dust formation and clustering in the ferroalloy industry. Specifically, this paper focuses on the evaporation of manganese metal, and how different parameters influence ...

    • Flue Gas Recirculation for the Silicon Process 

      Andersen, Vegar (Doctoral theses at NTNU;2023:135, Doctoral thesis, 2023)
      Metallurgical-grade silicon is a critical material for modern society. It is used as an alloying agent in aluminium alloys, feedstock for silicones, photovoltaics and electronics. Silicon is produced by carbothermal reduction ...

    • Formation of Copper–Neodymium Intermetallic Compounds by Carbothermic Reduction of Neodymium Oxide in the Presence of Copper 

      Ødegård, Ivar Andre; Tranell, Gabriella (Journal article; Peer reviewed, 2018)
      Carbothermic reduction of neodymium(III) oxide (Nd2O3) was performed by arc melting and in a graphite resistance furnace, using copper as a solvent metal. Successful carbothermic reduction was evident by formation of ...

    • Fume Formation and Measurements in the Metal-Production Industry 

      Myklebust, Håkon (Doctoral theses at NTNU;2022:14, Doctoral thesis, 2021)
      Airborne Particulate Matter (PM) is considered to be a major concern for both occupational health and the environment, and in the metal production industry, the level of such particles in the air can be considerable. This ...

    • Fume Formation from Oxidation of Liquid SiMn Alloy 

      Ma, Yan; Kero, Ida; Tranell, Gabriella (Journal article; Peer reviewed, 2017)
      Thermally generated fumes from the production of manganese ferroalloys are mostly composed of metallic oxides generated due to reaction between high-temperature molten metal and ambient oxygen in the air. In the current ...

    • Fuming during processing of FeSi alloys 

      Dahl, Henning (Master thesis, 2021)
      Støving er ei stor utfordring for metallproduksjonsindustrien. Støv går inn i naturen som forurensing, og luftveiene til verksarbeidere, hvor de bidrar til luftveissykdommer og kreft. Derfor er det veldig viktig å kontrollere ...

    • Gjenvinning av Sjeldne Jordarter fra Elektronisk Avfall 

      Vinje, Berit Johansen (Master thesis, 2016)
      De sjeldne jordartene er en gruppe av grunnstoffer med like kjemiske egenskaper som omfatter lantanoidene og scandium og yttrium. I løpet av de siste tiårene har de blitt essensielle for moderne og grønn teknologi, men ...

    • Heat Treatment of Mg-Containing Aluminum Alloys 5182 and 6016 in an Oxidizing Atmosphere with 4% CO2 

      Solem, Cathrine Kyung Won; Vullum, Per Erik; Tranell, Gabriella; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2022)
      Oxidation of liquid aluminum (Al) during processing is a widely known problem, and magnesium (Mg), as a common alloying element, increases the oxidation rate of the alloy. It has been established that small additions of ...

    • Heavy Metal Emissions from Primary Aluminium Production 

      Müller, Fride (Master thesis, 2022)
      Tungmetallutslipp i form av luftbårne partikler, eller støv, anses som en miljøbelastning og kan være helseskadelig for både mennesker og dyr. En bedre forståelse av forekomst og sammensetningen er derfor nødvendig for å ...

    • Influence of Mg Concentration on the Inhibiting Effect of CO2 on the Rate of Oxidation of Aluminum Alloys 5182 and 6016 

      Solem, Cathrine Kyung Won; Solberg, Egil; Tranell, Gabriella; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2021)
      Oxidation of aluminum alloys during production is a well-known problem and contributes to significant metal losses. As small additions of CO2 in the oxidizing atmosphere has proven to inhibit the oxidation rate for ...

    • Interaction between pre-reduced ilmenite and high titania slag melts 

      Foshaug, Jonas (Master thesis, 2023)
      I titanium industrien er ilmenitt ett av de viktigste r˚amaterialene. Ilmenitt behandles ved bruk av reduksjonsmetoder som involverer kull/koks. Det er et ønske om ˚a bevege seg bort fra kull/koks (CO) reduseringsmetoden ...

    • Karakterisering og analysering av ubehandlet og varmebehandlet flyveaske fra restavfallsforbrenning i Skandinavia 

      Melhus, Jonas; Woldstad, Trym; Bjerve, Vegard (Bachelor thesis, 2021)
      Flyveaske (FA) er et biprodukt fra forbrenning av husholdningsavfall. Sammensetningen i FA vil variere ut ifra hvilken forbrenningsprosess som brukes. De to vanligste er ristovnforbrenning (GF) og virvelsjiktforbrenning ...

    • Kinetics of Magnesiothermic Reduction of Natural Quartz 

      Rasouli, Azam; Tsoutsouva, Maria; Safarian, Jafar; Tranell, Gabriella (Peer reviewed; Journal article, 2022)
      In this work, the kinetics of natural quartz reduction by Mg to produce either Si or Mg2Si was studied through quantitative phase analysis. Reduction reaction experiments were performed at various temperatures, reaction ...

    • Konvertering av silica nanostrukturer med metallothermisk reduksjon. 

      Sørensen, Sigurd (Master thesis, 2016)
      Produksjon av fornybar energi ved bruk av silisiumbaserte solceller er en viktig del av vår innsats for å redusere utslippet av klimagasser og få bukt med en av vår tids største utfordringer; global oppvarming. For å gjøre ...

    • Magnesiothermic Reduction of Natural Quartz 

      Rasouli, Azam; Herstad, Karl Edvin; Safarian, Jafar; Tranell, Gabriella (Journal article; Peer reviewed, 2022)
      In the current work, the metallothermic reduction of natural quartz by magnesium has been studied at 1373 K under different reaction conditions, i.e. quartz type, quartz particle size, Mg:SiO2 mole ratio and reaction time. ...