Browsing NTNU Open by Author "Wallin, Maria"
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A Combined Upcycling Route for Silicon Powder Waste and a Silicon Alloy
Meling, Mathilde (Master thesis, 2023)Silisium er et avgjørende element i produkter som omgir oss hver dag, som solcellepaneler, elektronikk og i kjemiske produkter. Behovet for en bærekraftig og sirkulær verdikjede for silisium er presserende. Dagens produksjon ... -
Densification of charcoal by thermal decomposition of methane
Larsen, Marius (Master thesis, 2022)I dette prosjektet ble densifisering av trekull gjennom dekomponering av metan undersøkt. Totalt ble 6 prøvesett analysert, hver med en vekt på ca 350 g. De ulike gradene av densifisering var 10.3 , 11.1 , 24.0 og 29.7 ... -
The Effect of Hydrogen and Methane Containing Gases on SiC and SiO formation
Aarnæs, Trygve Storm (Doctoral theses at NTNU;2023:48, Doctoral thesis, 2023)The production of silicon is currently done in a submerged arc furnace where quartz react with carbon. This emits large amounts of CO2to the atmosphere. From a global warming perspective this is far from ideal, and ... -
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 ... -
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 ... -
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 ... -
Innovative Utilization of Aluminum-Based Secondary Materials for Production of Metallurgical Silicon and Alumina-Rich Slag
Philipson, Harald; Solbakk, Gjermund L.; Wallin, Maria; Einarsrud, Kristian Etienne; Tranell, Maria Gabriella (Journal article; Peer reviewed, 2022) -
Methods for K-impregnation of carbon materials and their effect on the CO2 reactivity
Solhaug, Emma (Master thesis, 2022)En veldig stor andel av det norske CO2utslippet kommer som en følge av bruk av fossile karbon materialer i metall produksjon. I den norske mangan (Mn) produksjonen er koks mest brukt til å redusere manganmalmen. Denne ... -
Phase Distribution During Slag Formation in Mn Ferroalloy Production
Mukono, Tichaona; Wallin, Maria; Tangstad, Merete (Peer reviewed; Journal article, 2022)Phase development during slag formation and reduction of Comilog and Assmang ores in a setup that simulates the conditions in an industrial SAF process under different coke bed temperatures, 1473 K (1200 °C), 1673 K (1400 ... -
Prereduction Behavior of Manganese Ores With Solid Carbon and in CO/CO<inf>2</inf> Gas Atmosphere
Mukono, Tichaona; Reiersen, Henrik Stensdal; Schanche, Trygve Lindahl; Wallin, Maria; Tangstad, Merete (Peer reviewed; Journal article, 2022)The prereduction reactions in the submerged arc furnace (SAF) are highly decisive of the total carbon, and energy consumption of the ferromanganese process. Therefore, understanding the dependency of prereduction behavior ... -
Silicon Production via Aluminothermic Reduction of Calcium Silicate Slags
Philipson, Harald (Doctoral theses at NTNU;2024:344, Doctoral thesis, 2024)Silicon is in high demand around the world, thanks to its essential role in everything from solar cells to silicones. But producing silicon is no small feat—it consumes a lot of energy and produces a significant amount of ... -
Slag Reduction and Viscosities Interaction in Ferromanganese Process
Mukono, Tichaona; Wallin, Maria; Tangstad, Merete (Peer reviewed; Journal article, 2022)Slag reduction and viscosity are closely related in the practical operation of a submerged arc furnace for ferromanganese (FeMn) production. The viscosity of slag is dependent on temperature and its composition, and ... -
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 ...