Blar i NTNU Open på forfatter "Tangstad, Merete"

Viser treff 41-60 av 144

    • Energy Distribution in HC FeMn and SiMn - Energy vs Exergy Analyses 

      Larssen, Trine Asklund; Kero, Ida; Tangstad, Merete (Peer reviewed; Journal article, 2019)
      The metal producing industry is a high consumer of energy and large amounts of excess heat are produced. Increasing the energy efficiency would be beneficial, both in terms of the environment and also from an economical ...

    • Evolution of SiOx shell layers on SiC-SiOx core-shell nanowires 

      Broggi, Andrea; Ringdalen, Eli; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      Composite core-shell SiC-SiOx nanowires can be produced by heating quartz and SiC powders, with addition of Ar(g) or He(g). The two powders are mixed to create pellets, which will react to SiO(g) and CO(g) at elevated ...

    • Extent of Ore Prereduction in Pilot-scale Production of High Carbon Ferromanganese 

      Mukono, Tichaona; Gjøvik, Jonas Einan; Gaertner, Heiko; Wallin, Maria; Ringdalen, Eli; Tangstad, Merete (Peer reviewed; Journal article, 2021)
      Three pilot-scale experiments have been conducted at SINTEF/NTNU in a 440 kVA AC electric furnace to demonstrate the process operation, energy requirements and CO2 emissions in the production of high carbon ferromanganese ...

    • Factors influencing dissolution of carbonaceous materials in liquid Fe– Mn 

      Kaffash, Hamideh; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      Carbon dissolution from four types of metallurgical cokes and graphite was investigated by using immersion rods in a resistance furnace to clarify the influence of factors governing the rate of carbon dissolution from ...

    • Ferromanganese Production from Pretreated Manganese Ores: From Laboratory scale to Pilot scale 

      Mukono, Tichaona (Doctoral theses at NTNU;2023:25, Doctoral thesis, 2023)
      The production of high carbon ferromanganese (HCFeMn) alloys is an energy intensive process where manganese ores are smelted in a submerged arc furnace (SAF) using carbon reductants thereby generating CO2 emissions. In the ...

    • Formation and characterization of β-and α-Silicon Carbide produced during Silicon/Ferrosilicon process 

      Jayakumari, Sethulakshmy (Doctoral theses at NTNU;2020:252, Doctoral thesis, 2020)
      Silicon carbide (SiC) is one of the main intermediate compounds generated during primary silicon (Si) production in submerged arc furnaces. Carbon materials, either biomass-based (charcoal and wood chips) or based on fossil ...

    • Formation of Silicon Carbide and Graphite in the Silicomanganese Process 

      Einan, Jonas (Master thesis, 2012)
      When a liquid SiMn alloy is cooled, carbon is dissolved from the melt. The dissolved carbon either forms graphite or reacts with silicon from the melt to form SiC. The goal of this thesis has been to determine how temperature ...

    • Formation of Silicon Carbide in the Silicomanganese Process 

      Davidsen, Jens Erik (Master thesis, 2011)
      As the silicon content in a silicomanganese alloy increase, silicon carbide becomes the stable carbon phase. Little work is published on the formation of silicon carbide in the SiMn process. This thesis examines the formation ...

    • Gas Flow in Charges for Mn-Ferroalloy Production 

      Eidsaune, Tyri (Master thesis, 2023)
      Et sentralt mål for ferromanganindustrien er å redusere energiforbruk og utslipp av klimagasser knyttet til produksjonen. For å bidra til å løse disse utfordringene ble PreMa-prosjektet initiert. PreMa-prosjektets mål er ...

    • Gaseous reduction of Mn ores in CO-CO2 atmosphere 

      Larssen, Trine Asklund; Tangstad, Merete; Kero, Ida (Chapter, 2018)
      The efficiency in production of manganese ferroalloys is dependent on the gaseous reduction of the higher manganese oxides in the ores used as raw materials. The materials, descending in the furnace, will meet the furnace ...

    • Graphite crucible interaction with Fe–Si–B phase change material in pilot-scale experiments 

      Jiao, Jianmeng; Tangstad, Merete; Jayakumari, Sethulakshmy; Wallin, Maria (Peer reviewed; Journal article, 2023)
      Fe–26Si–9B alloy is a promising high temperature phase change material (HTPCM), due to its high heat of fusion, small volumetric change, abundance, and low cost. Additionally, graphite has been identified as a promising ...

    • High temperature interaction between Si–B alloys and Si3N4 

      Jiao, Jian Meng; Tang, Kai; Safarian, Jafar; Grorud, Bettina; Sellevoll, Kathrine; Tangstad, Merete (Peer reviewed; Journal article, 2021)
      Si3N4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si3N4 were ...

    • High Temperature Interaction of Si-B Alloys with Graphite Crucible in Thermal Energy Storage Systems 

      Jiao, Jianmeng; Safarian, Jafar; Grorud, Bettina; Tangstad, Merete (Journal article; Peer reviewed, 2019)
      Si-B alloys are proposed as a potential phase change material (PCM) in the novel high temperature thermal energy storage systems. For successfully introducing the new PCM, the selection of proper refractory material in the ...

    • In situ observation of the carbothermic reduction and foaming of slags in silicomanganese production 

      Canaguier, Vincent Yves; Tangstad, Merete (Journal article; Peer reviewed, 2021)
      The carbothermic reduction of slag in silicomanganese production is accompanied by the release of carbon monoxide. This gas can accumulate as bubbles within the slag, leading to foaming and, potentially, disturbances to ...

    • Interaction of Eutectic Fe-Si-B Alloy with Graphite Crucibles 

      Grorud, Bettina (Master thesis, 2018)
      The work in this thesis was performed as a part of the AMADEUS project. The goal was to experimentally investigate the interaction between eutectic Fe-Si-B alloy and dense graphite crucibles, and the results will be compared ...

    • Interaction of SiO-gas and Charcoal and the Formation of SiC and Si 

      Nordbø, Eirik Andre (Master thesis, 2019)
      For å nå eit høgt utbytte i produksjonen av silisium, er det viktig å fange stigande SiO-gass ved reaksjon med karbonhaldig materialar for å danne SiC. Den påfølgjande reaksjonen mellom SiC og SiO-gass er kjend for å ...

    • 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 ...

    • Interfacial Behaviour in Ferroalloys: The Influence of FeMn Slag Composition 

      Bublik, Sergey; Tangstad, Merete; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2022)
      The present study investigated the interfacial interaction between FeMn alloy and slags of different compositions and basicity from 0.4 to 1.2 in a sessile drop furnace. Interfacial tension between the FeMn alloy and the ...

    • Interfacial Behaviour in Ferroalloys: The Influence of Sulfur in FeMn and SiMn Systems 

      Bublik, Sergey; Bao, Sarina; Tangstad, Merete; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2021)
      The present study has investigated the influence of sulfur content in synthetic FeMn and SiMn from 0 to 1.00 wt pct on interfacial properties between these ferroalloys and slags. The effect of experimental parameters such ...

    • Investigation of slag and condensate from the charge top in a FeSi75 furnace 

      Folstad, Marit Buhaug; Jusnes, Karin Fjeldstad; Tangstad, Merete (Chapter, 2023)
      Metallurgical silicon/ferrosilicon is produced industrially in submerged arc furnaces by carbothermic reduction of quartz. In addition to raw materials, oxide impurities are present in the furnace. Accumulated slag is ...