Blar i Institutt for materialteknologi på tittel
Viser treff 1900-1919 av 2523
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Reducing the Carbon Footprint: Primary Production of Aluminum and Silicon with Changing Energy Systems
(Peer reviewed; Journal article, 2021)The world now pushes for a low-carbon future, and international goals for greenhouse gas emission reductions have been set. Industrial processes, including metallurgical processes, make up more than a fifth of the total ... -
Reduction and Dissolution Behaviour of Manganese Slag in the Ferromanganese Process
(Journal article; Peer reviewed, 2020)The reduction and liquidus behaviour of manganese slag with different basicities were studied in non-isothermal experiments in the temperature range of 1400–1500 °C. Certain amounts of quartz were added to Assmang ore ... -
Reduction Mechanisms in Manganese Ore and Deposition of Carbon from Natural Gas
(Master thesis, 2017)This report investigates the deposition of carbon from natural gas onto manganese ore and the effect of reduction of the higher manganese oxides. Manganese ore has been heated in an argon atmosphere, before methane was ... -
Reduction of bauxite and Alcontaining waste to produce calcium aluminate slags and iron
(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 ... -
Reduction of commercial hematite pellet in isothermal fixed bed-experiments and numerical modelling
(Journal article; Peer reviewed, 2016)In the present work, fixed bed reduction experiments were conducted at 1173 K over a range of H2/CO ratios from 0.8 to 2.0 and subsequently modelled numerically. The model consists of two one-dimensional, isothermal and ... -
Reduction of Manganese Ore Agglomerates
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:344, Doctoral thesis, 2013) -
Reduction of Manganese Ores in CO-CO2 Atmospheres
(Peer reviewed; Journal article, 2021)The reduction of higher manganese oxides to MnO in the prereduction zone of a ferromanganese furnace is largely decisive for the overall energy efficiency and climate gas emissions for the overall production process. ... -
Reduction of MnO and SiO2 from Assmang and Comilog based Slags
(Master thesis, 2017)Silicomanganese(SiMn) and ferromanganese (FeMn) represent essential ingredients for the steel producing industries due to enhancing effects on steel quality. While extensive efforts have been made in investigating the ... -
Reduction of Norwegian and Indian ilmenite with carbon monoxide and hydrogen gas blends
(Journal article, 2016)Synthesis gas, produced from natural gas, can be used to minimise coal consumption and carbon dioxide emissions during the processing of ilmenite. Two different ilmenite ores have been reduced with carbon monoxide and ... -
Reduction of Pelletized Tyssedal Ilmenite and the Effect of Changing Gas Composition and Flow, Pellet Size and Pre Oxidation Condition
(Master thesis, 2011)This master thesis is based on reduction experiments of pelletized Tyssedal ilmenite. The focus is set on the effect of changing parameters such as gas composition, gas flow, pellet size and pre-oxidation condition. The ... -
Reduction of SilicoManganese Slags - Comparing Coke and Charcoal as Reductants
(Master thesis, 2023)Produksjonen av silisiummangan (SiMn) er en karbotermisk reduksjonsprosess. Prosessen benytter seg hovedsakelig av det fossile karbonmaterialet koks som reduksjonsmiddel. Økende miljøbekymringer har ført til større intensiver ... -
Reduction of SiO2 to SiC using natural gas
(Journal article; Peer reviewed, 2014)This paper presents a preliminary study of SiC production by use of natural gas for reduction of silica. Direct reduction of SiO2 by gas mixtures containing CH4, H2, and Ar was studied at temperatures between 1273 K and ... -
Reduction Rate of SiMn Slags With Different Carbon Materials
(Master thesis, 2020)I produksjonen av silikomangan (SiMn) er det behov for karbon som reduseringsmiddel, og i dagens industri brukes materialet koks for det meste. Koks har opphav fra fossile kilder, og dersom CO2 utslippet skal reduseres i ... -
Reduction rates of MnO and SiO2 in SiMn slags between 1500 and 1650°C
(Journal article; Peer reviewed, 2019)The kinetics of MnO and SiO2 reduction in SiMn slags based on Assmang/Comilog ore and HCFeMn (high-carbon ferromanganese) slag were investigated between 1500 and 1650°C under a CO atmosphere. The results showed that charges ... -
Reduction Rates of SiMn Slags from Various Raw Materials
(Doctoral theses at NTNU;2018:260, Doctoral thesis, 2018) -
Reduction Rates of SiMn Slags from Various Raw Materials
(Doctoral theses at NTNU;2018:260, Doctoral thesis, 2018)The kinetic information in the SiMn (Silicomanganese) process from melting of raw materials to production of metal was investigated in this work. This is of interest for the SiMn production industries where the effect of ... -
Refining Kinetics of the SisAl Silicon Alloy
(Master thesis, 2023)SisAl Pilot-prosjektet er dedikert til å utforske en mer miljøvennlig tilnærming til produksjon av silisium. Hovedmålet er å redusere karbonavtrykket og energiforbruket forbundet med tradisjonelle metoder ved å erstatte ... -
Refining of Silicon by Solidification of Al-Si Melt
(Master thesis, 2012)Primary silicon crystals grown from an Al-Si melt has been investigated by solidifying directionally and under electromagnetic field. The goal of this thesis was to increase the size of the primary Si crystals and to ... -
Regularized Yield Surfaces for Crystal Plasticity of Metals
(Peer reviewed; Journal article, 2020)The rate-independent Schmid assumption for a metal crystal results in a yield surface that is faceted with sharp corners. Regularized yield surfaces round off the corners and can be convenient in computational implementations. ... -
Relationship between Al-Ni intermetallic Phases and Bond Strength in Roll Bonded Steel-Aluminum Composites with Nickel Interlayers
(Journal article; Peer reviewed, 2019)In this work, the interface characteristics and resulting bond strength were investigated for roll bonded steel-aluminum composites with nickel interlayers, both after rolling and after post-rolling heat treatments at 400 ...