Browsing NTNU Open by Author "Tangstad, Merete"

Now showing items 1-20 of 144

    • A multiscale numerical approach of the dripping slag in the coke bed zone of a pilot scale Si-Mn furnace 

      Letout, Sebastien Romain; Ratvik, Arne Petter; Tangstad, Merete; Johansen, Stein Tore; Olsen, Jan Erik (Chapter, 2017)
      The Si-Mn alloy process production in submerged arc furnaces (SAF) is investigated. The aim of the studies currently in progress is an enhancement of the knowledge about the key reactions and the mass transport phenomenon ...

    • AMADEUS: Next generation materials and solid state devices for ultra high temperature energy storage and conversion 

      Datas, Alejandro; Cristobal, Ana Belen; del Cañizo, Carlos; Antolin, Elisa; Beaughon, Michel; Nikolopoulos, Nikolaos; Nikolopoulos, Aristeidis; Zeneli, Myrto; Sobczak, Natalia; Polkowski, Wojciech; Tangstad, Merete; Safarian, Jafar; Trucchi, Daniele M; Bellucci, Alessandro; Girolami, Marco; Marx, Roman; Bestenlehner, Dominik; Lang, Stephan; Vitulano, Aniello; Sabbatella, Gianfranco; Marti, Antonio (Journal article; Peer reviewed, 2018)
      Starting in January 2017, AMADEUS (www.amadeus-project.eu) is the first project funded by the European Commission to research on a new generation of materials and solid state devices for ultra-high temperature energy storage ...

    • As-tapped Liquid Silicon Temperature Measurements in an Industrial Furnace 

      Werner, Tobias (Master thesis, 2019)
      Denne oppgaven tar for seg temperaturmålinger av smeltet silisium i rennen fra en industriell ovn. For at silisiumindustrien skal kunne oppfylle egne og myndigheters mål om forbedret energieffektivitet og lavere ...

    • Beneficiation of fluxed titaniferous slag to a marketable titania product using the modified upgraded slag process 

      Goso, Xolisa; Petersen, Jochen; Tangstad, Merete; Safarian, Jafar (Peer reviewed; Journal article, 2022)
      Smelting production of a limestone-fluxed titaniferous slag with low MgO content for subsequent beneficiation using the modified Upgraded Slag (UGS) process was investigated, with the aim of producing a marketable titania ...

    • Beneficiation of fluxed titaniferous slag to a marketable titania product using the modified upgraded slag process 

      Goso, Xolisa; Petersen, Jochen; Tangstad, Merete; Safarian, Jafar (Peer reviewed; Journal article, 2021)
      Smelting production of a limestone-fluxed titaniferous slag with low MgO content for subsequent beneficiation using the modified Upgraded Slag (UGS) process was investigated, with the aim of producing a marketable titania ...

    • Boron Removal from Silicon Melts by H2O/H2 Gas Blowing: Mass Transfer in Gas and Melt 

      Sortland, Øyvind Sunde; Tangstad, Merete (Journal article; Peer reviewed, 2014)
      Metallurgical routes for solar grade silicon production are being developed as alternatives to chemical processes for their potential to achieve cost reductions, increased production volume, and reduced environmental and ...

    • CFD Modeling of boron removal from liquid silicon with cold gases and plasma 

      Vadon, Mathieu; Sortland, Øyvind Sunde; Nuta, Ioana; Chatillon, Christian; 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) or of Ar-H2-O2 ...

    • CFD Study on Continuous Tapping of Silicon 

      Olsen, Jan Erik; Ksiazek, Michal Tomasz; Tangstad, Merete (Peer reviewed; Journal article, 2022)
      Silicon is mostly produced in rotating submerged arc furnaces with continuous tapping of metal. The burden is often dense due to condensates. Thus, furnace gas does not escape easily to the top of the burden and some gas ...

    • Characterisation of a Real-World Søderberg Electrode 

      Glastonbury, Ralph; Beukes, Paul; van Zyl, Pieter Gideon; Tangstad, Merete; Ringdalen, Eli; Dall, Douglas; Steenkamp, Joalet Dalene; Mushwana, Masana (Peer reviewed; Journal article, 2021)
      Very little research on Søderberg electrodes has been published in the journal peer reviewed public domain. The main aim of this work is to characterise a Søderberg electrode that was cut off approximately 0.5 m below the ...

    • Characterization of a Si-SiO2 mixture generated from SiO and CO 

      Broggi, Andrea; Tangstad, Merete; Ringdalen, Eli (Journal article; Peer reviewed, 2019)
      The reaction between SiO(g) and CO(g) is a relevant intermediate reaction in the silicon production process. One of the products generated from this gas mixture is called by its color, brown condensate. In this paper, ...

    • Characterization, thermodynamics and mechanism of formation of SiC-SiOx core–shell nanowires 

      Broggi, Andrea; Ringdalen, Eli; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      Silicon carbide nanowires are valuable for electronic and optical applications, due to their high mechanical and electrical properties. Previous studies demonstrated that nanowires can be produced easily, by mixing a ...

    • Charcoal as an Alternative Reductant in Ferroalloy Production: A Review 

      Surup, Gerrit Ralf; Trubetskaya, Anna; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      This paper provides a fundamental and critical review of biomass application as renewable reductant in integrated ferroalloy reduction process. The basis for the review is based on the current process and product quality ...

    • CO Reactivity of Manganese Lumps Versus Briquettes 

      Jesus, Leandro Gustavo de Mendes; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      In this work, a comparison between CO reactivity of lumps and briquettes made of two different binder and three different raw materials is presented. Experimental results on the prereduction behavior of such materials in ...

    • CO2 Gasification of Densified Biomass: The Influence of K on Reaction Rate 

      Kaffash, Hamideh; Tangstad, Merete (Peer reviewed; Journal article, 2022)
      The Boudouard reactivity of metallurgical coke and densified charcoals was investigated in this study. Potassium is known to accumulate in ferromanganese furnaces and hence was evaluated as a catalyst of CO2 reactivity. ...

    • Comparative study of AC and DC solvers based on current and power distributions in a submerged arc furnace 

      Tesfahunegn, Yonatan; Magnusson, Tordur; Tangstad, Merete; Sævarsdottir, Gudrun A. (Peer reviewed; Journal article, 2020)
      This work discusses 3D models of current distribution in a three-phase submerged arc furnace that contains several components, such as electrodes, central arcs, craters, crater walls, and side arcs that connect electrodes ...

    • Compatibility Study of Carbon-Based Refractory Materials utilized in Silicomanganese Production Furnaces 

      Mølnås, Håvard (Master thesis, 2011)
      Tap hole refractories constitute critical parts of the refractory lining in submerged arc furnaces. For several hours every day, molten slag and metal flow through the tap hole calling for thorough selection of refractory ...

    • Conceptual Tapping Model of Mn-Ferroalloy Furnaces 

      Tangstad, Merete; Olsen, Jan Erik; Ringdalen, Eli; Ksiazek, Michal Tomasz; Reynolds, Quinn; Steenkamp, Joalet (Peer reviewed; Journal article, 2022)
      The tapping process of submerged arc furnaces, like the Mn-ferroalloy production process, is when you drain the liquid metal and slag from the furnace. The optimal tapping process is when slag and metal is drained from the ...

    • Condensation of SiO and CO in silicon and ferrosilicon production 

      Broggi, Andrea (Doctoral theses at NTNU;2021:93, Doctoral thesis, 2021)
      Kondensasjon av SiO(g) er kombinasjon av to reaksjoner i silisiumprosessen. Den første er interaksjonen mellom SiO(g) og CO(g). Den andre er reaksjonen mellom to SiO(g) molekyler. Disse to reaksjonene foregår i lavtemperatursonen ...

    • Damring formation during rotary kiln chromite pre-reduction: Effects of pulverized carbonaceous fuel selection and partial pellet melting 

      van Staden, Yolindi; Beukes, Johan Paul; van Zyl, Pieter Gideon; Ringdalen, Eli; Tangstad, Merete; Kleynhans, Ernst L.J.; Bunt, John Reginald (Journal article; Peer reviewed, 2018)
      Electricity consumption is the largest cost contributing factor in the production of ferrochrome. Currently the pelletized chromite pre-reduction process (solid-state reduction of chromite) is the process option with the ...

    • Decrepitation of Comilog, Assmang and UMK manganese ores during prereduction 

      Biørnstad, Olav (Master thesis, 2020)
      Produksjon av manganlegeringer er en industri som forbruker mye elektrisk energi og karbonmaterialer. Prereduksjon av manganmalm er ønsket for å senke forbruket av elektrisk energi og karbonmaterialer. For at dette skal ...