Browsing NTNU Open by Author "Larssen, Trine Asklund"
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Effect of Moisture, Hydrogen, and Water–Gas Shift Reaction on the Prereduction Behavior of Comilog and Nchwaning Manganese Ores
Larssen, Trine Asklund; Tangstad, Merete (Peer reviewed; Journal article, 2022)The ore–gas reactions in the prereduction zone in a ferromanganese furnace are largely decisive of the overall energy efficiency, carbon consumption, and climate gas emissions in ferromanganese production. An increased ... -
Effect of Raw Materials on Temperature Development during Prereduction of Comilog and Nchwaning Manganese Ores
Larssen, Trine Asklund; Tangstad, Merete (Peer reviewed; Journal article, 2023)The effect of raw materials on the temperature development and prereduction behavior of Comilog and Nchwaning manganese ores (3.33–4.00 mm or 11.20–15.00 mm) were investigated in a CO-CO2 atmosphere. Experiments were ... -
Energy Distribution in HC FeMn and SiMn - Energy vs Exergy Analyses
Larssen, Trine Asklund; Kero, Ida; Tangstad, Merete (Peer reviewed; Journal article, 2019)The metal producing industry is a high consumer of energy and large amounts of excess heat are produced. Increasing the energy efficiency would be beneficial, both in terms of the environment and also from an economical ... -
Gaseous reduction of Mn ores in CO-CO2 atmosphere
Larssen, Trine Asklund; Tangstad, Merete; Kero, Ida (Chapter, 2018)The efficiency in production of manganese ferroalloys is dependent on the gaseous reduction of the higher manganese oxides in the ores used as raw materials. The materials, descending in the furnace, will meet the furnace ... -
Prereduction of Comilog- and Nchwaning ore
Larssen, Trine Asklund (Doctoral theses at NTNU;2020:415, Doctoral thesis, 2020)Manganese ferroalloys are mainly used as an alloying element in steel production and are normally produced in submerged arc furnaces. Raw materials such as manganese ore, metallurgical coke and fluxes (and quartz for SiMn) ... -
Reaction Rate Analysis of Manganese Ore Prereduction in CO-CO2 Atmosphere
Larssen, Trine Asklund; Senk, Dieter Georg; Tangstad, Merete (Peer reviewed; Journal article, 2021)Variations in energy efficiency and climate gas emissions in production of manganese ferroalloys are largely related to the solid-state reduction of the manganese ores used as raw material in the production. The gas-solid ... -
Reduction of Manganese Ores in CO-CO2 Atmospheres
Larssen, Trine Asklund; Senk, Dieter; Tangstad, Merete (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
Larssen, Trine Asklund (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 rates of MnO and SiO2 in SiMn slags between 1500 and 1650°C
Kim, Pyunghwa; Larssen, Trine Asklund; Tangstad, Merete (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 ...