Low-temperature reduction of hematite to metallic iron by hydrogen is an essential process for ironmaking based on the blast furnace and non-blast furnace technologies. In this work, the reduction behaviors of Brazilian hematite in 20%H 2 –80%Ar at 400–570 °C were investigated in a micro-fluidized bed.
The reduction roasting was done at 1200°C with 35% lignite on low-graded lump hematite ore with a particle size range of (20–50 mm) at a reduction time of (60–300 mins), the reduced iron ore was ground into a two-stage concentrate (20/30 mins) of 90% theoretical Iron (TFe) and 89.3% iron recovery.
The present manuscript provides a comprehensive overview of the fundamental principles underlying the utilization of hydrogen in the direct reduction of iron ore, thereby establishing a foundation for investigating the role of impurity oxides.
The challenge is to achieve massive production of H2 in acceptable economic conditions. The second process is the direct reduction of iron ore in a shaft furnace operated with hydrogen only.
This review summarizes the studies of critical parameters to determine the kinetics of reduction. The variables considered were temperature, iron ore type (magnetite, hematite, goethite), H 2 /CO ratio, porosity, flow rate, the concentration of diluent (He, Ar, N 2), gas utility, annealing before
This review summarizes the studies of critical parameters to determine the kinetics of reduction. The variables considered were temperature, iron ore type (magnetite, hematite, goethite), H2/CO ratio, porosity, flow rate, the concentration of diluent (He, Ar, N2), gas utility, annealing before reduction, and pressure.
Hydrogen-based direct reduction (HyDR) of iron ores has attracted immense attention and is considered a forerunner technology for sustainable ironmaking. It has a high potential to mitigate CO2 emissions in the steel industry, which accounts today for ~ 8–10% of all global CO2 emissions. Direct reduction produces highly porous sponge iron via …
Excess of CO 2 favors magnetite formation instead. Direct reduction of mineral iron carbonate with hydrogen is a high-potential candidate for carbon dioxide emission reduction in the iron and steel industry. This novel technology provides a new route for 'clean' iron production.
The present compilation discusses the scientific and engineering developments on the reduction-roasting of iron-ore followed by the CFD–DEM modelling and simulation work performed to reduce iron ore to magnetite.
The reduction controlling mechanisms identified using hydrogen as a reducing gas were chemical reaction for the conversion from hematite to wüstite and diffusion control for the final reduction from wüstite to metallic iron.
