Blar i NTNU Open på forfatter "Safarian, Jafar"
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Effects of H2-H2O Mixtures on Reducibility of Bauxite Residue - CaO Sintered Pellets
Erland, Sivert Ragnhildstveit; Dahl, Elias Trondsen (Bachelor thesis, 2023)Det er et sterkt ønske å minimere produksjonen av rødslam fra aluminiumindustrien, da det står for et stort miljøproblem i dag. Det høye alkalitetsnivået og fordelingen av fine partikkelstørrelser er hovedårsakene til at ... -
Effects of La2O3 Addition into CaO-SiO2 Slag: Structural Evolution and Impurity Separation from Si-Sn Alloy
Zhu, Mengyi; Wu, Guixuan; Azarov, Alexander; Monakhov, Eduard; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2021)Boron (B) and phosphorus (P) are the most problematic impurities to be removed in the production of solar-grade silicon by the metallurgical process. In this work, the distribution of B and P between CaO-(La2O3)-SiO2 slags ... -
Ekstraksjon av sjeldne jordarter fra "grey mud" ved bruk av saltsyre
Salvesen, Malin (Master thesis, 2019)Bayer prosessen som brukes til produksjon av aluminiumoksid er ikke veldig bærekraftig på grunn av stor produksjon av avfallet rødslam. Dette avfallet skaper miljutfordringer på grunn av sin nødvendige lagring på land. En ... -
Evaluation of Calcium Aluminate Slags and Pig Irons Produced from the Smelting-Reduction of Diasporic Bauxite
Lazou, Adamantia; Kolbeinsen, Leiv; Safarian, Jafar (Peer reviewed; Journal article, 2021)This work evaluates the characteristics of calcium aluminate slag and pig iron samples obtained from the smelting of calcined and reduced diasporic bauxite ore. The study is conducted in the Pedersen process framework, ... -
Flux-smelting behavior and aluminothermic reduction of a pre-reduced Mn ore
Nyhus, Eline (Master thesis, 2023)Denne masteroppgaven presenterer en eksperimentell studie som undersøker smelte- og aluminotermisk smelte-reduksjonsprosesser av en pre-redusert Mn-malm ved bruk av kalk (CaO) og metallisk aluminium. Målet med studien er ... -
High temperature interaction between Si–B alloys and Si3N4
Jiao, Jian Meng; Tang, Kai; Safarian, Jafar; Grorud, Bettina; Sellevoll, Kathrine; Tangstad, Merete (Peer reviewed; Journal article, 2021)Si3N4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si3N4 were ... -
High Temperature Interaction of Si-B Alloys with Graphite Crucible in Thermal Energy Storage Systems
Jiao, Jianmeng; Safarian, Jafar; Grorud, Bettina; Tangstad, Merete (Journal article; Peer reviewed, 2019)Si-B alloys are proposed as a potential phase change material (PCM) in the novel high temperature thermal energy storage systems. For successfully introducing the new PCM, the selection of proper refractory material in the ... -
Hydrogen-Based Iron Recovery from Bauxite Residue
Velle, Sander Ose; Vollan, Frida; Skibelid, Olivia Bogen (Bachelor thesis, 2022)Valorisering av bauksittavfall er essensielt for bærekraftig produksjon av aluminium, og undersøkes videre i denne bacheloroppgaven. Hydrogenreduksjon av jernoksider i en blanding av bauksitt-avfall og kalkstein ble studert ... -
Hydrogen-Based Iron Recovery from Bauxite Residue
Velle, Sander Ose; Vollan, Frida; Skibelid, Olivia Bogen (Bachelor thesis, 2022)Valorisering av bauksittavfall er essensielt for bærekraftig produksjon av aluminium, og undersøkes videre i denne bacheloroppgaven. Hydrogenreduksjon av jernoksider i en blanding av bauksitt-avfall og kalkstein ble studert ... -
Hydrometallurgical Purification of Magnesium-Doped Silicon by Different Acids
Safarian, Jafar; Espelien, Stine (Chapter, 2017)The purification of commercial metallurgical grade silicon through alloying and then acid leaching is studied. Magnesium is added into molten silicon and then acid leaching of the solidified Si-Mg alloy by HCl, H2SO4 and ... -
Impurity removal from Si by Si-Ca-Mg ternary alloying-leaching system
Zhu, Mengyi; Wan, Di; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)In this work, Si-Ca-Mg alloys were made with different compositions and solidification conditions to investigate the impurity segregation and separation performance from Si, especially for the crucial P impurity at several ... -
Interaction of Eutectic Fe-Si-B Alloy with Graphite Crucibles
Grorud, Bettina (Master thesis, 2018)The work in this thesis was performed as a part of the AMADEUS project. The goal was to experimentally investigate the interaction between eutectic Fe-Si-B alloy and dense graphite crucibles, and the results will be compared ... -
Interactions of FeSi Alloys with Graphite Crucibles
Sellevoll, Kathrine (Master thesis, 2019)Arbeidet i denne avhandlingen har vært en del av EU-prosjektet AMADEUS, som undersøker nye faseendrende materialer (PCM) for "Latent Heat Thermal Energy Storage" (LHTES) systemer. Det overordnede målet for AMADEUS-prosjektet ... -
Investigating Aluminum Tri-Hydroxide Production from Sodium Aluminate Solutions in the Pedersen Process
Mwase, James Malumbo; Vafeias, Michail; Marinos, Danai; Dimitrios, Panias; Safarian, Jafar (Journal article, 2022) -
An Investigation on Reduction of Calcium Added Bauxite Residue Pellets by Hydrogen and Iron Recovery through Physical Separation Methods
Hassanzadeh, Ahmad; Kar, Manish Kumar; Safarian, Jafar; Kowalczuk, Przemyslaw Boguslaw (Peer reviewed; Journal article, 2023)This study investigates the properties of H2-reduced calcium-added bauxite residue, self-hardened pellets, and the feasibility of iron recovery through electrostatic and magnetic separation methods. The oxide pellets are ... -
Iron separation from bauxite through smelting reduction
Sellæg, Hanne (Master thesis, 2019)containing slag. Sammendrag Alumina produksjon domineres kommersielt av Bayer-prosessen som også produserer rødslam. Dette kan ikke forbrukes og foråsaker store skader på miljøet. Et bærekraftig alternativ for bearbeiding ... -
Iron Separation from Bauxite Through Smelting-Reduction Process
Sellæg, Hanne; Kolbeinsen, Leiv; Safarian, Jafar (Chapter, 2017)In the alumina production process through the dominant commercial Bayer process red mud, which is not consumable and causes serious environmental challenges is produced. Alternative sustainable process for bauxite treatment ... -
Isothermal Hydrogen Reduction of a Lime-Added Bauxite Residue Agglomerate at Elevated Temperatures for Iron and Alumina Recovery
Olivia Bogen, Skibelid; Ose Velle, Sander; vollan, Frida; Eijk, Casper van der; Hoseinpur Kermani, Arman; Safarian, Jafar (Peer reviewed; Journal article, 2022)The hydrogen reduction of bauxite residue lime pellets at elevated temperatures was carried out to recover iron and alumina from the bauxite residue in a new process route. Prior to the H2 reduction, oxide pellets were ... -
Kinetic study of vacuum evaporation of elements from ternary melts; case of dilute solution of P in Si-Al melts
Hoseinpur Kermani, Arman; Tang, Kai; Safarian, Jafar (Journal article; Peer reviewed, 2019)This research is devoted to study phosphorus removal from Si-Al alloys by vacuum refining of the ternary system of dilute solutions of P in Si-20 wt%Al. The experiments were carried out in an induction furnace and after ... -
Kinetics of Magnesiothermic Reduction of Natural Quartz
Rasouli, Azam; Tsoutsouva, Maria; Safarian, Jafar; Tranell, Gabriella (Peer reviewed; Journal article, 2022)In this work, the kinetics of natural quartz reduction by Mg to produce either Si or Mg2Si was studied through quantitative phase analysis. Reduction reaction experiments were performed at various temperatures, reaction ...