Browsing NTNU Open by Author "Tranell, Gabriella"
Now showing items 81-93 of 93
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The effect of thickness and compaction on the recovery of aluminium in recycling of foils in salt flux
Philipson, Harald (Master thesis, 2020)I Norge förbränns mer än 40 000 ton aluminiumförpackningar årligen. Återvinning av denna mängd aluminiumförpackningar skulle spara 1,5 TWh energi och hundratusentals ton av koldioxidutsläpp. Det mycket svårare att återvinna ... -
The Effect of Varying CaO/SiO2 Ratios and Reductant Addition in Silicon Production by Aluminothermic Reduction of Silica Based Slags
Solbakk, Gjermund Lie (Master thesis, 2021)Målet med dette arbeidet var å se på hvordan forskjellige CaO/SiO2 forhold i slagger, samt hvordan forskjellige reduktant tilsatser påvirker aluminotermisk reduksjon av silika i nevnte slagger. SisAl Pilot prosjektet har ... -
The Kinetics of Boron Transfer in Slag Refining of Silicon
Krystad, Egil; Tang, Kai; Tranell, Gabriella (Journal article; Peer reviewed, 2012)Slag refining is one of the few metallurgical methods for efficient removal of boron from silicon. In industrial slag refining for production of silicon for photovoltaic applications, the relationship between the slag ... -
The Mechanism Behind the Oxidation Protection of High Mg Al Alloys with Beryllium
Smith, Nicholas; Kvithyld, Anne; Tranell, Gabriella (Journal article; Peer reviewed, 2018)The addition of beryllium to Al-Mg alloys is known to cause a dramatic decrease in oxidation; however, the mechanism behind this protective effect is not yet fully understood. To aid in finding an alternative to the toxic ... -
Thermal De‑coating Pre‑treatment for Loose or Compacted Aluminum Scrap and Consequences for Salt‑Flux Recycling
Vallejo-Olivares, Alicia; Høgåsen, Solveig; Kvithyld, Anne; Tranell, Gabriella (Peer reviewed; Journal article, 2022)In aluminum recycling, thermal de-coating pre-treatments remove moisture and organic contamination before re-melting. If the scrap is compacted into bales or briquettes before the thermal treatment and re-melting processes, ... -
Thermodynamic and Kinetic Behavior of B and Na Through the Contact of B-Doped Silicon with Na2O-SiO2 Slags
Safarian-Dastjerdi, Jafar; Tranell, Gabriella; Tangstad, Merete (Journal article; Peer reviewed, 2013)Boron (B) is the most problematic impurity to be removed in the processes applied for the production of solar grade silicon. Boron removal from liquid silicon by sodium-silicate slags is experimentally studied and it is ... -
Thermodynamic Behavior and Mass Transfer Kinetics of Boron Between Ferrosilicon and CaO-SiO2 Slag
Krystad, Egil Grøndal; Jakobsson, Lars Klemet; Tang, Kai; Tranell, Gabriella (Journal article; Peer reviewed, 2017)Equilibrium distribution and transport kinetics of boron between ferrosilicon and calcium silicate slag were investigated through experimental study. A 50 pct CaO-50 pct SiO2 slag (by weight) was held for different durations ... -
Upgrading off-grades from the silicon process: Increasing the silicon yield from Elkem Thamshavn using mechanical or metallurgical separation
Østensen, Ole Jørgen (Master thesis, 2011)The aim of the thesis is to produce high grade silicon from off-grade materials like sculls and process slags from Elkem Thamshavn. The methods investigated are dense medium separation, optical separation, flotation and ... -
Using AERMOD to predict the dispersion of emissions from the aluminum industry
Nilsen, Mads Urang (Master thesis, 2022)Økt fokus på de miljøskadelige effektene av utslipp har gitt opphav til strengere krav i sammenheng med utsippskontroll i aluminiumsindustrien. Derfor ønsker industrien å innføre effektive måter å estimere dispersjonen av ... -
Vacuum and Gas Refining of Silicon for Solar Cell Applications
Kermani, Arman Hoseinpur (Doctoral theses at NTNU;2021:244, Doctoral thesis, 2021)In this research, the vacuum and gas refining for P and B removal from Si to reach solar grade silicon (SoG – Si) are studied. The vacuum refining process is modeled by applying the Hertz – Knudsen – Langmuir evaporation ... -
Valorization of SiMn Sludge for Production of Low-Phosphorus Ferroalloys
Wallin, Maria; Bugten, Andreas Voll; Tranell, Gabriella; Ekstrøm, Kai Erik (Journal article; Peer reviewed, 2021)The sludge generated by wet scrubbing the off-gas from a silicomanganese plant in Norway represents a significant loss in silicon and manganese values. This work seeks to extract these values in the production of ferroalloys ... -
Wavelength and orientation dependent capture of light by diatom frustule nanostructures
Romann, Julien Clement; Valmalette, Jean-Christophe; Chauton, Matilde Skogen; Tranell, Gabriella; Einarsrud, Mari-Ann; Vadstein, Olav (Peer reviewed; Journal article, 2015)The ecological success of diatoms is emphasized by regular blooms of many different species in all aquatic systems, but the reason behind their success is not fully understood. A special feature of the diatom cell is ... -
XPS Examination of the Oxide-Metal Interface of an Aluminum-Magnesium Alloy Containing Beryllium
Smith, Nicholas; Kvithyld, Anne; Tranell, Gabriella (Chapter, 2018)The addition of beryllium to high magnesium aluminum alloys has long been known to cause a significant decrease in the rate of alloy oxidation. A clear understanding of the fundamental mechanism behind this effect is still ...