Blar i NTNU Open på forfatter "Tangstad, Merete"

Viser treff 101-120 av 145

    • Recycling of Glass Wool Waste 

      Rudjord, Fredrik (Master thesis, 2018)
      The importance of environmentally friendly solution is an ever-increasing concern of industries all over the country. The glass wool industry has for a long time had a problem regarding waste from their production process. ...

    • Reduction and Dissolution Behaviour of Manganese Slag in the Ferromanganese Process 

      Li, Xiang; Tang, Kai; Tangstad, Merete (Journal article; Peer reviewed, 2020)
      The reduction and liquidus behaviour of manganese slag with different basicities were studied in non-isothermal experiments in the temperature range of 1400–1500 °C. Certain amounts of quartz were added to Assmang ore ...

    • Reduction of Manganese Ores in CO-CO2 Atmospheres 

      Larssen, Trine Asklund; Senk, Dieter; Tangstad, Merete (Peer reviewed; Journal article, 2021)
      The reduction of higher manganese oxides to MnO in the prereduction zone of a ferromanganese furnace is largely decisive for the overall energy efficiency and climate gas emissions for the overall production process. ...

    • Reduction of MnO and SiO2 from Assmang and Comilog based Slags 

      Larssen, Trine Asklund (Master thesis, 2017)
      Silicomanganese(SiMn) and ferromanganese (FeMn) represent essential ingredients for the steel producing industries due to enhancing effects on steel quality. While extensive efforts have been made in investigating the ...

    • Reduction of SilicoManganese Slags - Comparing Coke and Charcoal as Reductants 

      Forberg, Sigmund Andres Kvammen (Master thesis, 2023)
      Produksjonen av silisiummangan (SiMn) er en karbotermisk reduksjonsprosess. Prosessen benytter seg hovedsakelig av det fossile karbonmaterialet koks som reduksjonsmiddel. Økende miljøbekymringer har ført til større intensiver ...

    • Reduction of SiO2 to SiC using natural gas 

      Ksiazek, Michal Tomasz; Tangstad, Merete; Dalaker, Halvor; Ringdalen, Eli (Journal article; Peer reviewed, 2014)
      This paper presents a preliminary study of SiC production by use of natural gas for reduction of silica. Direct reduction of SiO2 by gas mixtures containing CH4, H2, and Ar was studied at temperatures between 1273 K and ...

    • Reduction Rate of SiMn Slags With Different Carbon Materials 

      Hosum, Benjamin Dale (Master thesis, 2020)
      I produksjonen av silikomangan (SiMn) er det behov for karbon som reduseringsmiddel, og i dagens industri brukes materialet koks for det meste. Koks har opphav fra fossile kilder, og dersom CO2 utslippet skal reduseres i ...

    • Reduction rates of MnO and SiO2 in SiMn slags between 1500 and 1650°C 

      Kim, Pyunghwa; Larssen, Trine Asklund; Tangstad, Merete (Journal article; Peer reviewed, 2019)
      The kinetics of MnO and SiO2 reduction in SiMn slags based on Assmang/Comilog ore and HCFeMn (high-carbon ferromanganese) slag were investigated between 1500 and 1650°C under a CO atmosphere. The results showed that charges ...

    • Reduction Rates of SiMn Slags from Various Raw Materials 

      Kim, Pyunghwa Peace (Doctoral theses at NTNU;2018:260, Doctoral thesis, 2018)

    • Reduction Rates of SiMn Slags from Various Raw Materials 

      Kim, Pyunghwa Peace (Doctoral theses at NTNU;2018:260, Doctoral thesis, 2018)
      The kinetic information in the SiMn (Silicomanganese) process from melting of raw materials to production of metal was investigated in this work. This is of interest for the SiMn production industries where the effect of ...

    • Refining of Silicon by Solidification of Al-Si Melt 

      Richardsen, Sissel (Master thesis, 2012)
      Primary silicon crystals grown from an Al-Si melt has been investigated by solidifying directionally and under electromagnetic field. The goal of this thesis was to increase the size of the primary Si crystals and to ...

    • Removal of Boron from Silicon by Gas refining with Water and Hydrogen 

      Sulentic, Ines (Master thesis, 2012)
      A high demand of silicon for solar cells has lead to a search of an alternative route to solar grade silicon. A suggested method is upgrading metallurgical grade silicon. This thesis focuses on the gas refining of silicon ...

    • Removal of boron from silicon by slag treatment and by evaporation of boron from slag in hydrogen atmosphere 

      Bjerke, Helene (Master thesis, 2012)
      Background and objective: Removal of boron is one of the main challenges in the purification of metallurgical grade silicon (MG-Si) for solar cells and a simple low cost method is therefore needed. Boron removal by slag ...

    • Removal of Phosphorus from Silicon Melts by Vacuum Refining 

      Xakalashe, Buhle Sinaye (Master thesis, 2011)
      Induction vacuum refining testwork has been carried out for the removal of phosphorus from silicon melts. This work is of interest for the production of solar-grade silicon, since phosphorus is hard to remove from silicon ...

    • Removal of Phosphorus in Metallurgical Silicon by Rare Earth Elements 

      Tang, Kai; Løvvik, Ole Martin; Safarian-Dastjerdi, Jafar; Ma, Xiang; Tangstad, Merete (Journal article; Peer reviewed, 2014)
      Removal of phosphorus in metallurgical silicon is one of the crucial steps for the production of solar grade Si feedstock. The possibility of doping rare earth elements for phosphorus removal has in this work been studied ...

    • Shock Heating Test of Quartz for Si and FeSi Production 

      Jusnes, Karin Fjeldstad; Tangstad, Merete; Ringdalen, Eli (Research report, 2017)
      Six different quartz types used as raw material for Si and FeSi production, were shock heated to 1500 °C in an induction furnace. The amounts of fines produced were measured and compared. The method has been used before ...

    • Si-based phase change materials in thermal energy storage systems 

      Jiao, Jian Meng (Doctoral theses at NTNU;2020:137, Doctoral thesis, 2020)
      The main aim of this dissertation is to develop new phase change materials (PCMs) for high temperature energy storage in thermal energy storage (TES) devices, with special focus on Si-based PCMs due to silicon’s the high ...

    • SiC crystalline micro bullets on bio-carbon based charcoal substrate 

      Jayakumari, Sethulakshmy; Vullum, Per Erik; Van Helvoort, Antonius; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      Silicon carbide (SiC) micro bullets were grown on a bio-carbon based charcoal substrate, the morphology and crystal structure were analyzed. In order to collect the crystallographic details scanning electron microscopy ...

    • SiC formation and SiO reactivity of methane at high temperatures 

      Aarnæs, Trygve Storm; Tangstad, Merete; Ringdalen, Eli (Peer reviewed; Journal article, 2021)
      Methane (CH4) is a carbon source currently not in use in the production of silicon. Using a gaseous carbon source instead of conventional solid carbon sources presents an opportunity to rethink silicon production. Preliminary ...

    • SiC production using SiO 2 and Cagglomerates 

      Li, Fei (Doctoral theses at NTNU;2017:180, Doctoral thesis, 2017)
      Due to the possible shortage of high-quality fossil carbon materials and charcoal for the Si industry, this study will focus on the possibility of using natural gas as the substitute of commercially scarce high quality ...