Now showing items 21-40 of 62

    • Interactions of FeSi Alloys with Graphite Crucibles 

      Sellevoll, Kathrine (Master thesis, 2019)
      Arbeidet i denne avhandlingen har vært en del av EU-prosjektet AMADEUS, som undersøker nye faseendrende materialer (PCM) for "Latent Heat Thermal Energy Storage" (LHTES) systemer. Det overordnede målet for AMADEUS-prosjektet ...
    • Karbiddannelse i Manganovner 

      Øvrelid, Sigurd Johannes Slåtsve (Master thesis, 2019)
      Når karbon løses opp i silikomangan(SiMn)-prosessen kan det dannes titankarbid (TiC), silisiumkarbid (SiC) eller grafitt i ovnen. Silisiuminnholdet i legeringen avgjør om silisiumkarbid eller grafitt vil være den stabile ...
    • Kinetic Investigations of SiMn Slags From Different Mn Sources 

      Kim, Pyunghwa; Tangstad, Merete (Journal article; Peer reviewed, 2018)
      The kinetics of MnO and SiO2 reduction were investigated for Silicomanganese (SiMn) slags using a Thermogravimetric analysis (TGA) between 1773 K and 1923 K (1500 °C and 1650 °C) under CO atmospheric pressure. The charge ...
    • Kinetic modeling of the reaction rate for quartz and carbon pellet 

      Li, Fei; Tangstad, Merete (Journal article; Peer reviewed, 2018)
      Kinetic modeling of quartz and carbon pellet at temperatures of 1898 K, 1923 K, and 1948 K (1625 °C, 1650 °C, and 1675 °C) was investigated in this study. The carbon materials used were charcoal, coke, coal, and preheated ...
    • Kinetics of the reaction between quartz and silicon carbide in different gas atmospheres 

      Ni, Feng (Master thesis, 2015)
      This thesis examined the influence of different gas species in the kinetics of SiO2+SiC reaction. The quartz and silicon carbide were crushed to < 38µm, uniformly mixed together with weight ratio of 3:1 and pelletized into ...
    • Metal loss comprehension - metal emulsions in ferromanganese slags 

      Datin, Paul Guillaume Jean Clair (Master thesis, 2015)
      Literature review was done on metal in slag emulsions, using the surface phenomena literature in metallurgy as well as the oil and water emulsion broader literature. Several phenomena were found that could extend to the ...
    • Metal-producing Mechanisms in the Carbothermic Silicon Process 

      Vangskåsen, Jørund (Master thesis, 2012)
      The mechanisms in the carbothermic production of silicon have been examined in this report. Through the investigation of a pilot scale furnace as well as five small scale induction furnace experiments, a better understanding ...
    • Mn alloys production with the use of natural gas. - Understanding the kinetics of Mn alloy production 

      Nadir, Bilal (Master thesis, 2015)
      This research intends to develop the necessary understanding regarding the reaction kinetics involved in the production of manganese ferroalloys. The main reactions of interest are as follows: MnO_((l) )+C_((s,l))=Mn_((l ...
    • Ore melting and reduction in silicomanganese production 

      Ringdalen, Eli; Gaal, S.; Tangstad, Merete; Ostrovski, Oleg (Journal article; Peer reviewed, 2010)
      The charge for silicomangansese production consists of manganese ore (often mixed with ferromanganese slag) dolomite or calcite, quartz, and in some cases, other additions. These materials have different melting properties, ...
    • Passivation Threshold for the Oxidation of Liquid Silicon and Thermodynamic Non-equilibrium in the Gas Phase 

      Vadon, Mathieu; Sortland, Øyvind Sunde; Tangstad, Merete; Chichignoud, Guy; Delannoy, Yves (Journal article; Peer reviewed, 2018)
      The present study focuses on a specific step of the metallurgical path of purification to provide solar-grade silicon: the removal of boron through the injection of H2O(g)-H2(g)-Ar(g) (cold gas process). A progressive ...
    • Phase Transformations from Quartz to Cristobalite 

      Jusnes, Karin Fjeldstad; Tangstad, Merete; Ringdalen, Eli (The Minerals, Metals & Materials Series;, Chapter; Conference object, 2018)
      Two quartz types used in the silicon and ferrosilicon industry were heated to temperatures of 1600 and 1700 °C. The parameters varied were the temperature and the holding time at maximum temperature. The amount of quartz, ...
    • Phases and Zones in the Silicon Process 

      Bø, Siri Marie (Master thesis, 2016)
      Different zones and materials formed during the production of silicon in a silicon furnace has been examined in this thesis. Samples from two industrial scale silicon furnaces have been have been studied. The excavations ...
    • Pilot Scale Production of Manganese Ferroalloys Using Heat-Treated Mn-Nodules 

      Tangstad, Merete; Ringdalen, Eli; Manilla, Edmundo; Davila, Daniel (Journal article; Peer reviewed, 2017)
      Pilot-scale experiments are one way to investigate the process patterns and the reaction mechanisms of processes and raw materials. To understand a process fully, both theoretical considerations as well as small-scale ...
    • Production of Silicomanganese from Comilog Ore - Reduction Behavior 

      Holtan, Joakim (Master thesis, 2016)
      The reduction behavior of silicomanganese (SiMn) charges based on Comilog ore was investigated. The charges were heated up to to different temperatures by using a thermogravimetric graphite tube furnace. The weight loss ...
    • Reactivity of silicomanganese slag towards carbon materials - A comparison of coke and charcoal as reducing agents 

      Haugli, Ine Mariell Fagerbakk (Master thesis, 2019)
      Silikomangan produseres ved karbotermisk reduksjon med koks som reduksjonsmiddel. Mens koks er laget av kull og er en fossil karbonkilde, er trekull laget av trær og er en fornybar karbonkilde som ikke slipper ut ekstra ...
    • 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 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 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 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 ...