Blar i NTNU Open på forfatter "Einarsrud, Kristian Etienne"
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A Pragmatic Model for Bath Temperature Evolution During Alumina Feeding
Vachaparambil, Kurian J.; Johansen, Stein Tore; Solheim, Asbjørn; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2023)In this paper, we extend the pragmatic model for alumina feeding, presented in Johansen et al. Light metals 2022, to treat the associated evolution of bath temperature. The underlying idea of the framework is to reduce its ... -
A Raman-Structure Model for the Viscosity of SiO2- CaO-Al2O3 System
Haghdani, Shokouh; Tangstad, Merete; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2022)The relationship between structure and viscosity of molten slags is investigated using the Raman spectroscopy technique. To this end, a group of 20 synthetic slags in the SiO2-CaO-Al2O3 ternary system is considered. The ... -
A Review of Ferroalloy Tapping Models
Bublik, Sergey; Olsen, Jan Erik; Loomba, Varun; Reynolds, Quinn Gareth; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2021)Tapping is an important furnace operation in the ferroalloy industry and poses a number of complex and coupled challenges of both practical and economical importance. Owing to the hazardous high-temperature conditions ... -
Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts
Gökelma, Mertol; Einarsrud, Kristian Etienne; Tranell, Gabriella; Friedrich, Bernd (Journal article; Peer reviewed, 2020)The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to ... -
Silica Fume Formation in Different Gas Atmospheres
Andersen, Vegar; Rasouli, Azam; Einarsrud, Kristian Etienne; Tranell, Maria Gabriella (Peer reviewed; Journal article, 2023)Silica fume is an important byproduct from the silicon production process, with mainly concrete and refractory applications. In this work, the effect of different combustion gas atmospheres on the properties of silica fume ... -
Slag and its effect on Si and FeSi production
Folstad, Marit Buhaug (Doctoral theses at NTNU;2023:317, Doctoral thesis, 2023)Silicon (Si) is one of the most useful elements on earth and is popular due to its semiconductor characteristics and its abundance in form of quartz (SiO2). Both metallurgical Si and ferrosilicon (FeSi) are produced ... -
Slag Properties in the Primary Production Process of Mn-Ferroalloys
Tangstad, Merete; Bublik, Sergey; Haghdani, Shokouh; Einarsrud, Kristian Etienne; Tang, Kai (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 ... -
Slag-metal interactions in the FeMn tapping process: Interfacial properties and wetting
Bublik, Sergey; Bao, Sarina; Tangstad, Merete; Einarsrud, Kristian Etienne (Chapter, 2019)FeMn-alloys are produced by transforming ore and carbon materials into FeMn and slag at high temperatures in a furnace. Entrainment of FeMn in slag during tapping reduces the yield. Entrainment and subsequent separation ... -
Slag-Metal Separation in Mn Ferroalloy Production
Bublik, Sergey (Doctoral thesis, 2022)The separation of slag and metal in the ferroalloy production process is an important issue that has an impact on both the ecological and environmental considerations of the entire production process. The extensive mixing ... -
A Study of Bubble Behavior and Anode Effect on the Graphite and Industrial Carbon Anode in a See-Through Furnace During Aluminium Electrolysis
Stanic, Nikolina; Martinez, Ana Maria Cuellar; Einarsrud, Kristian Etienne; Sandnes, Espen (Peer reviewed; Journal article, 2022)Anode gas bubble behavior and anode effect on graphite and industrial carbon rod-shaped anode in a cryolite melt have been studied using a see-through furnace. The different carbon materials have different properties which ... -
Tapping Gas from the Silicon Submerged Arc Furnace: An Industrial Measurement Campaign
Andersen, Vegar; Gaertner, Heiko; Grådahl, Svend; Ksiazek, Michal Tomasz; Einarsrud, Kristian Etienne; Tranell, Gabriella (Journal article; Peer reviewed, 2022)Producing high-silicon alloys in submerged arc furnaces (SAF) involves the generation of an intermediate process gas, consisting of silicon monoxide (SiO) and carbon monoxide (CO). Combustion of process gas from the taphole ... -
Temperature and Velocity Effects on Mass and Momentum Transport in Spacer-Filled Channels for Reverse Electrodialysis: A Numerical Study
Jalili, Zohreh; Pharoah, Jon; Burheim, Odne Stokke; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2018)Concentration polarization is one of the main challenges of membrane-based processes such as power generation by reverse electrodialysis. Spacers in the compartments can enhance mass transfer by reducing concentration ... -
The micro- and macrostructure of alumina rafts
Gylver, Sindre Engzelius; Nina Helene, Omdahl; Rørvik, Stein; Hansen, Ingrid; Nautnes, Andrea; Neverdal, Sofie Nilssen; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2019)As alumina particles are fed to aluminium reduction cells, a frozen layer of bath is typically formed on the particle surface, due to the relatively low bath superheat. For particles in close proximity, platelets with ... -
Towards a coupled multi-scale, multi-physics simulation framework for aluminium electrolysis
Einarsrud, Kristian Etienne; Eick, Ingo; Bai, Wei; Feng, Yuqing; Hua, Jinsong; Witt, Peter J. (Journal article, 2017)Aluminium metal production through electrolytic reduction of alumina in a cryolite bath is a complex, multi-physics, multi-scale process, including magneto-hydrodynamics (MHD), bubble flow, thermal convection, melting and ... -
Using Surplus Heat to Pre-Heat Carbon Anodes for Aluminium Electrolysis
Grimstad, Martin (Master thesis, 2019)Karbon anoder brukes opp i Hall-Héroult prosessen og må erstattes regelmessig. Når en ny anode blir plassert i aluminiumsovnen, vil badet umiddelbart fryse på undersiden av anoden og danne et fryst isolerende lag. Denne ... -
Utilization of waste heat for pre-heating of anodes
Einarsrud, Kristian Etienne; Grimstad, Martin; Elstad, Kim Ronny; Solheim, Asbjørn (Peer reviewed; Journal article, 2020)Carbon anodes are replaced on a regular basis in Hall–Héroult cells as they are consumed by electrochemical reactions. Upon insertion of new anodes, bath will freeze locally as a result of low bath superheat and comparatively ... -
A Water Model Study of Alumina Feeding and Dispersion
Gylver, Sindre Engzelius; Aase, Simen; Bekkevoll, Simen; Forberg, Sigmund Andres Kvammen; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2022)