Blar i NTNU Open på forfatter "Tranell, Gabriella"
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Mass and Energy Balanced Life Cycle Assessment of Metallurgical Grade Silicon Production
Nøstvold, Cathrine (Master thesis, 2022)På grunn av forsyningsrisiko og en uerstattelig anvendelse innenfor et bredt spekter av lavkarbonteknologier, er silisium ansett som et kritisk råmateriale. Metallet fremstilles ved reduksjon av SiO2 i kvarts, ved bruk av ... -
Mass Transfer Coefficients and Bubble Sizes in Oxidative Ladle Refining of Silicon
Bjørnstad, Erlend Lunnan (Master thesis, 2016)The mass transfer of [Al] and [Ca] between three synthetic SiO_{2}-CaO-Al_{2}O_{3} slags, and 8N silicon, has been investigated to find the overall mass transfer coefficient k_{i,t} for the individual species. Samples were ... -
Mass Transfer of Al and Ca Between Silicon and Synthetic SiO2-CaO-Al2O3 Slags
Bjørnstad, Erlend Lunnan; Tranell, Gabriella (Chapter, 2017)The mass transfer of Al and Ca between silicon and synthetic SiO2 −CaO − Al2O3 slags of varying composition has been investigated, using different experimental set-ups. Samples were kept at 1600◦C, varying the holding times ... -
Material Flow Analysis of FeSi Furnace at Elkem Bjølvefossen
Müller, Fride; Grande, Heidi (Bachelor thesis, 2020)Hensikten med denne bacheloroppgaven var å utføre en materialstrømanalyse for ovn 5 ved Elkem Bjølvefossen med utgangspunkt i råvaredata fra 2019. Antagelsen om 100% jernutbytte er grunnlaget for distribusjon av hoved- og ... -
Mechanism behind the Inhibiting Effect of CO2 on the Oxidation of Al−Mg Alloys
Smith, Nicholas Albert; Gleeson, Brian; wissam, saidi; Kvithyld, Anne; Tranell, Gabriella (Journal article; Peer reviewed, 2018)Al–Mg alloys are known to suffer from problematic oxidation during melting, refining, and casting. The use of a CO2/air cover gas is known to minimize this oxidation; however, a mechanistic understanding of the beneficial ... -
Mechanisms and Kinetics of Boron Removal from Silicon by Humidified Hydrogen
Safarian, Jafar; Tang, Kai; Olsen, Jan Erik; Andersson, Stefan; Tranell, Gabriella; Hildal, Kjetil (Journal article; Peer reviewed, 2016)The removal of boron from silicon by top blowing of humidified hydrogen has been studied in the present work through experimental work, thermodynamic calculations, computational fluid dynamic modeling, and quantum chemistry ... -
Methods of Oxidation Inhibition for Al-Mg Alloys
Smith, Nicholas (Doctoral theses at NTNU;2019:29, Doctoral thesis, 2019)The oxidation of aluminum will occur at any notable oxygen partial pressure. This oxidation can be favorable as it forms a protective layer on the metal surface which prevents further oxidation. However, the addition of a ... -
Novel technique to study the wet chemical etching response of multi-crystalline silicon wafers
Matkivskyi, Vladyslav; Røyset, Arne Karstein; Stokkan, Gaute; Tetlie, Pål; Sabatino, Marisa Di; Tranell, Gabriella (Peer reviewed; Journal article, 2022)This study is based on the application of a combinatory method for surface and crystallinity analysis of crystalline materials. The obtained results illustrated the effects of different additives (isopropyl alcohol (IPA) ... -
Nucleation of SiO2-CaO-Al2O3 Slag in Oxidative Ladle Refining of Metallurgical Grade Silicon
Bjørnstad, Erlend Lunnan; Tranell, Gabriella (Peer reviewed; Journal article, 2021)Oxidative ladle refining (OLR) is the most used refining method in industrial production of metallurgical grade silicon. OLR is performed by purging the liquid alloy with oxygen-enhanced air at 1823 K to 1873 K, reacting ... -
On the Production of W–Fe–B Ternary Compounds by Self-propagating High-Temperature Synthesis
Soylu, Ece; Kaya, Faruk; Sezen, Meltem; Bakan, Feray; Tranell, Gabriella; Derin, Bora (Peer reviewed; Journal article, 2022)In this study, one-step production of W2FeB2 and WFeB compounds from oxide raw materials was carried out through cost-effective and energy-efficient aluminothermic self-propagating high-temperature synthesis (SHS). ... -
Oxidation and fume formation during production of Si and Mn-based alloys
Ma, Yan (Doctoral theses at NTNU;2018:313, Doctoral thesis, 2018)Thermally generated fumes from the production process of manganese ferroalloys are generated due to the reaction between high temperature liquid- or metal vapor and ambient oxygen in the air, and are mostly composed of ... -
Oxidation and Fume Formation from Liquid Silicomanganese Alloys Exposed to Atmospheres Containing Moisture
Ma, Yan; moosavi-khoonsari, Elmira; Myklebust, Håkon A Hartvedt Olsen; Tranell, Gabriella (Peer reviewed; Journal article, 2022)In industrial applications and laboratory studies, it has been shown that the use of water spray may significantly reduce the amount of fume generated from the oxidation process of liquid high carbon ferromanganese alloy. ... -
Oxidation of Liquid Silicon in a Medium Scale Induction Furnace: Examination of the Fuming Rate and Fume Composition
Smith, Nicholas (Master thesis, 2012)The aim of this work was to study the effect of flow rate on the fuming rate/silica flux of liquid silicon in order to gain a better understanding of the silica fuming during industrial ladle refining during silicon ... -
Oxidation of Liquid Silicon in Air Atmospheres Containing Water Vapor
Ma, Yan; Jiang, Bo; Moosavi-Khoonsari, Elmira; Andersson, Stefan; Opila, Elizabeth J.; Tranell, Gabriella (Peer reviewed; Journal article, 2019)The oxidation of silicon (Si) has been extensively investigated over the past 50 years. Yet, an understanding of the mechanism and rate of liquid Si oxidation in atmospheres containing water vapor, is lacking. The effect ... -
Oxidation of Manganese-Containing Aluminium Alloys: Oxidation of Molten Mn-Containing Al Alloys in Various Atmospheres
Wilson, Shawn (Master thesis, 2013)An oxidation study was performed on 99.99% Al, Al1%Mn and Al5%Mn materials, both ina thermogravimetric furnace, and in a muffle furnace. The mass gain behaviour for thesematerials was studied and compared for dierent ... -
Oxidation-Enhanced Evaporation in High-Carbon Ferromanganese
Myklebust, Håkon A Hartvedt Olsen; Andersson, Stefan; Tranell, Gabriella (Peer reviewed; Journal article, 2021)Lifetime and reliability in realistic operating conditions are important parameters for the application of thin-film piezoelectric microelectromechanical systems (piezoMEMS) based on lead zirconate titanate (PZT). Humidity ... -
Oxidative Ladle Refining of Metallurgical Grade Silicon: Refining of Ca and Al Impurities
Bjørnstad, Erlend Lunnan (Doctoral theses at NTNU;2021:277, Doctoral thesis, 2021)English summary Metallurgical grade silicon (MG-Si) is used as an alloying agent, raw material, or as a precursor compound, in the production of aluminum alloys, silicones, photovoltaics, and electronics. Access to ... -
Oxidative Refining of Metallurgical Grade Silicon: Lab-Scale Measurements on the Overarching Refining Behavior of Ca and Al
Bjørnstad, Erlend Lunnan; Jung, In-Ho; Van Ende, Marie-Aline; Tranell, Gabriella (Peer reviewed; Journal article, 2022)Oxidative ladle refining (OLR) is the most widely used refining process for removal of dissolved Ca and Al in the industrial production of metallurgical grade silicon (MG-Si). Refining occurs by purging the silicon alloy ... -
Parameters Contributing to the Formation of NOx in the Silicon Furnace: The effect of the charging frequency and raw material composition on the formation of NO
Brede, Ingeborg (Master thesis, 2013)NOx is a harmful gas emitted primarily by the transport industry, agriculture and petroleum industry. The emissions contribute to acid rain and global warming. The gas also has certain health risks; when exposed to NO-based ... -
Parametric Study of Molten Aluminium Oxidation in Relation to Dross Formation at Laboratory and Industrial Scale
Solem, Cathrine Kyung Won (Doctoral theses at NTNU, 2022:341, Doctoral thesis, 2022)Aluminium (Al) white dross, classified as a hazardous waste, is a heterogeneous mixture of metallic Al, oxides, and non-metallic compounds (NMC) originating from the primary production route of Al. Over the past few decades, ...