Blar i NTNU Open på forfatter "Kaffash, Hamideh"
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CO2 Gasification of Densified Biomass: The Influence of K on Reaction Rate
Kaffash, Hamideh; Tangstad, Merete (Peer reviewed; Journal article, 2022)The Boudouard reactivity of metallurgical coke and densified charcoals was investigated in this study. Potassium is known to accumulate in ferromanganese furnaces and hence was evaluated as a catalyst of CO2 reactivity. ... -
Densification of Biocarbon and Its Effect on CO2 Reactivity
Kaffash, Hamideh; Tangstad, Merete; Surup, Gerrit Ralf (Peer reviewed; Journal article, 2021)Charcoal is an interesting reducing agent because it is produced from biomass which is renewable and does not contribute to global warming, provided that there is a balance between the felling of timber and growth of trees. ... -
Dissolution kinetics of carbon materials in FeMn
Kaffash, Hamideh (Doctoral theses at NTNU;2019:226, Doctoral thesis, 2019)Submerged electric arc furnace (SAF) is the main process for industrial production of ferroalloys, in which metal oxides are reduced by carbon. To decrease the production cost and reduce the CO2 emissions, a variety of ... -
Factors influencing dissolution of carbonaceous materials in liquid Fe– Mn
Kaffash, Hamideh; Tangstad, Merete (Peer reviewed; Journal article, 2020)Carbon dissolution from four types of metallurgical cokes and graphite was investigated by using immersion rods in a resistance furnace to clarify the influence of factors governing the rate of carbon dissolution from ... -
Life Cycle Based Climate Emissions of Charcoal Conditioning Routes for the Use in the Ferro-Alloy Production
Surup, Gerrit Ralf; Kaffash, Hamideh; Ma, Yan; Trubetskaya, Anna; Pettersen, Johan Berg; Tangstad, Merete (Peer reviewed; Journal article, 2022)Renewable reductants are intended to significantly reduce CO2 emissions from ferro-alloy production, e.g., by up to 80% in 2050 in Norway. However, charcoals provide inferior properties compared to fossil fuel-based ... -
Study of the Physical Behaviour and the Carbothermal Reduction of Self-Reducing Briquettes Developed with Iron Ore Fines, Charcoal and Silica Fume Residues
da Luz Pascoal, Aline; Aristides Victor Rossoni, Hygor; Kaffash, Hamideh; Tangstad, Merete; Bicalho Henriques, Andréia (Peer reviewed; Journal article, 2022)Self-reducing briquettes made with waste (silica fume, iron ore and charcoal fines) from the FeSi75 industry were studied. The objective was to determine if these briquettes could be used as a complementary load in submerged ... -
Wettability of cokes by Fe-Mn melt
Kaffash, Hamideh; Xing, Xing; Tangstad, Merete (Peer reviewed; Journal article, 2020)Four metallurgical cokes were heat treated at 1250 °C to 1550 °C in argon atmosphere. The influence of heat treatment on the microstructure of metallurgical cokes was characterized using X-ray diffraction and Raman ...