Blar i NTNU Open på forfatter "Safarian, Jafar"
-
Purification of Silicon Through a Hydrometallurgical Process
Espelien, Stine Pettersen (Master thesis, 2017)The demand for cleaner energy is rising because of the global warming and because of the access of fossil energy one day will come to an end. For encounter this demand, solar cells have a huge potential. Today the market ... -
Pyrometallurgical and Hydrometallurgical Treatment of Calcium Aluminate-containing Slags for Alumina Recovery
Azof, Fabian Imanasa (Doctoral theses at NTNU;2020:82, Doctoral thesis, 2020)The pyrometallurgical and hydrometallurgical part of the Pedersen process has been studied. The process can be seen as one of the most potent alternative processes to recover alumina from bauxite more sustainably than the ... -
Recycling of Fine Silicon Particles for Solar Grade Silicon Production
Wermers, Matthew Engel (Master thesis, 2018)The production of solar grade silicon wafers results in 50% wasted silicon. Due to the high volume of waste, recycling the fines into a useable material allows for use of all this valuable silicon. Currently there is no ... -
Recycling of industrial silicon-kerf waste via leaching and flux-melting.
Garshol, Askh Kano; Hannah, Skarsvåg (Bachelor thesis, 2023)Produksjonen av solar grade silisium oblater som brukes i solcelleproduksjon er en lang og kompleks prosess som resultater i at 50% av rent silisium blir kastet vekk etter kutte prossesen. Dette har vært et problem som har ... -
Reduction of bauxite and Alcontaining waste to produce calcium aluminate slags and iron
Lazou, Adamantia (Doctoral theses at NTNU;2021:192, Doctoral thesis, 2021)The production of metallurgical grade Al2O3 from bauxite ores is mainly done through the Bayer process. This process is well established and efficient, but it has environmental challenges, and the main being the formation ... -
Removal of Ti from pig iron by slag refining
Windfeldt, Magnus Kyrre (Master thesis, 2020)I dette prosjektet undersøkes muligheten for bruk av slaggraffinering for å fjerne titan fra karbonholdig råjern, som en del av ENSUREAL-prosjektet for bærekraftig produksjon av alumina. Slaggen som brukes til raffinering ... -
Rheological properties of Al2O3–CaO–SiO2 slags
Tang, Kai; Eijk, Casper van der; Gouttebroze, Sylvain; Du, Qiang; Safarian, Jafar; Tranell, Gabriella (Peer reviewed; Journal article, 2022)The Al2O3–CaO–SiO2 ternary is a basic oxide system relevant for the Pedersen alumina production process and for aluminothermic silicon production with low environmental impact using secondary aluminium and silica raw ... -
Selective Vacuum Evaporation by the Control of the Chemistry of Gas Phase in Vacuum Refining of Si
Hoseinpur Kermani, Arman; Andersson, Stefan; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2021)The evaporation of P from liquid Si under vacuum and reduced pressures of H2, He, and Ar was studied to evaluate the feasibility of effective P removal with insignificant Si loss. It was found that the introduction of Ar ... -
Si-based phase change materials in thermal energy storage systems
Jiao, Jian Meng (Doctoral theses at NTNU;2020:137, Doctoral thesis, 2020)The main aim of this dissertation is to develop new phase change materials (PCMs) for high temperature energy storage in thermal energy storage (TES) devices, with special focus on Si-based PCMs due to silicon’s the high ... -
Silicon purification by acid leaching and slag refining techniques
Zhu, Mengyi (Doctoral theses at NTNU;2021:117, Doctoral thesis, 2021)Solar energy has become the most popular and fastest-growing renewable energy resource worldwide. However, it still requires the current solar-grade silicon (SoG-Si, purity 99.9999%) production with a larger manufacturing ... -
SILICON PURIFICATION THROUGH MAGNESIUM ADDITION AND ACID LEACHING
Safarian, Jafar; Tranell, Gabriella (Chapter, 2016)Silicon is the dominant material in photovoltaic devices and with regard to the PV market growth, the demand for solar grade silicon feedstock is expected to be high in the future. Although solar silicon is currently ... -
Silicon refining through alloying by calcium and magnesium, controlled solidification and leaching
Bergheim, Jarle (Bachelor thesis, 2022)I denne bacheloroppgaven var målet å bedre forstå hvordan avkjølingshastighet påvirker raffinering av silisium, når legeringssystemet Si-Ca-Mg brukes i forbindelse med utluting med syre. Mikrostruktur og effektiv fjerning ... -
Smelting-reduction of bauxite for sustainable alumina production
Safarian, Jafar; Kolbeinsen, Leiv (Chapter, 2016)Bauxite ore is the main raw material for aluminum production, it is converted into alumina (Al2O3) to obtain a proper charge material for aluminum production in Hall-Heroult process. Bayer process is the main commercial ... -
Sustainability in alumina production from bauxite
Safarian, Jafar; Kolbeinsen, Leiv (Chapter, 2016)Alumina (Al2O3) is the main material used for the aluminum production, which is originated from bauxite ore through hydrothermal processes. Although bauxite conversion to alumina can be done through a few competitive ... -
Synthesis and Characterization of 12CaO·7Al2O3 Slags: The Effects of Impurities and Atmospheres on the Phase Relations
Azof, Fabian Imanasa; Tang, Kai; You, Jinglin; Safarian, Jafar (Journal article; Peer reviewed, 2020)Synthesis of crystalline slags of 12CaO·7Al2O3 phase from the corresponding melt compositions in different atmospheric conditions and different purities is investigated. Observations using a thermogravimetry coupled with ... -
Synthesis of Mg2Si and its use for Silane production
Rasouli, Azam (Doctoral theses at NTNU;2023:291, Doctoral thesis, 2023)The increase in the use of renewable energy sources is crucial to address global warming and its impact on our planet. Solar energy is predicted to experience the most rapid growth of the different sources of renewable ... -
The leachability of a ternary CaO-Al2O3-SiO2 slag produced from smelting-reduction of low-grade bauxite for alumina recovery
Azof, Fabian Imanasa; Vafeias, Michail; Panias, Dimitrios; Safarian, Jafar (Journal article; Peer reviewed, 2019)A combination of smelting-reduction of bauxite and leaching treatment of the produced slag for alumina recovery is known as the Pedersen process. The process is considered to be more sustainable for producing metallurgical-grade ... -
The Leachability of Calcium Aluminate Phases in Slags for the Extraction of Alumina
Azof, Fabian Imanasa; Safarian, Jafar; Kolbeinsen, Leiv (Journal article, 2017)Alumina is used primarily as feedstock for aluminum production. It occurs naturally in bauxite and clay and other minerals, and can be concentrated in industrial by-products such as coal gangue, fly ash, blast furnace slag, ... -
The Use of Eutectic Fe-Si-B Alloy as a Phase Change Material in Thermal Energy Storage Systems
Jiao, Jianmeng; Grorud, Bettina; Sindland, Caroline; Safarian, Jafar; Tang, Kai; Sellevoll, Kathrine; Tangstad, Merete (Journal article; Peer reviewed, 2019)Fe-26.38Si-9.35B eutectic alloy is proposed as a phase change material (PCM) as it exhibits high latent heat, high thermal conductivity, moderate melting point, and low cost. For successful implementation of it in the ... -
Thermochemical Aspects of Boron and Phosphorus Distribution Between Silicon and BaO-SiO2 and CaO-BaO-SiO2 slags
Safarian, Jafar (Journal article; Peer reviewed, 2018)In the production of solar grade silicon by metallurgical route the distribution of B and P between slags and liquid silicon is the most important key issue. The equilibrium and thermochemistry of reactions between liquid ...