Sulfur Distribution between Liquid Iron and Magnesia-Saturated Slag in H₂/H₂O Atmosphere Relevant to a Novel Green Ironmaking Technology

Abstract

As an integral part of a research project which aimed to develop a novel green ironmaking process, an experimental determination of the sulfur distribution ratios, L S , between molten iron and CaO−MgO (saturated) −SiO 2 −Al 2 O 3 −FeO slag was carried out in the temperature range of 1550−1650 °C. Oxygen partial pressure was controlled by H 2 /H 2 O equilibrium in the range of 10 −10 −10 −8 atm. Under these conditions applicable to the proposed process, L S was 34 times smaller than that under the conditions of the blast furnace. Considering the relative amounts of sulfur inputs in the two processes as well as other factors, however, the proposed process is expected to produce iron with a lower sulfur content, which will decrease the need for desulfurization in the steelmaking stage.

Effect of Water Vapor Content in H2–H2O–CO–CO2 Mixtures on the Equilibrium Distribution of Manganese between CaO–MgOsat–SiO2–Al2O3–FeO–P2O5 Slag and Molten Iron

“…The experimental apparatus, the materials, and the detailed procedures have been described elsewhere, the summary of which is presented in this paper.…”

“…One potential route in the proposed technology is to collect the metal as a molten bath where the gas, slag, and molten iron would be equilibrated with each other. The current research was conducted to answer the question: “Does the type of gas mixture used to control the oxygen partial pressure ( p O 2 ) affect the equilibrium distribution of Mn between slag and molten iron?” For this objective, the distribution of Mn has been investigated between molten iron and MgO‐saturated CaO–FeO–Al 2 O 3 –SiO 2 –MnO (0.2–0.8 wt%)–P 2 O 5 (0.1–0.9 wt%) slags in the temperature range 1550–1650°C under CO/CO 2 , H 2 /H 2 O, and CO/CO 2 /H 2 /H 2 O atmospheres using the experimental and analysis methods described elsewhere …”

Effect of water vapour content in H2–H2O–CO–CO2mixtures on MgO solubility in slag under conditions of novel flash ironmaking technology

“…From preliminary experiments, [17][18][19] it was confirmed that no noticeable change in the MgO content in the slag occurred after 8 h. To assure three-phase (gas-slagmetal) equilibria, 10 and 15 h were chosen in this work.…”

Development of a Novel Flash Ironmaking Technology with Greatly Reduced Energy Consumption and CO2 Emissions

“…It should also require much less capital investment than the blast furnace/coke oven combination. At the University of Utah, an alternative technology to meet these demands, called the flash ironmaking technology (FIT), has been under development [1][2][3][4][5][6][7]. This novel technology eliminates the highly problematic cokemaking and pelletization/sintering steps by directly utilizing iron ore concentrate, which is currently produced in large quantities in North America and elsewhere.…”