Abstract
In this research, Australian fine iron ore is reduced by pressured carbon monoxide in a fluidized bed. This research aims to obtain the influence law of gas linear velocity, reduction pressure, reduction temperature, particle size, and reduction time on the reduction effect and the economic, convenient, and effective operating parameters, as well as clarify the effect of the pressurized decarbonization of CO, which inhibits the adhesion of fine iron ore particles during the reduction process. The experimental results show that the preferable operating parameters are a linear velocity of 0.8 m/s, reduction pressure of 0.2 MPa, reduction temperature of 1023 K, and particle size of 0.18 mm–0.66 mm. The graphite produced by the carbon precipitation reaction of carbon monoxide hinders the diffusion of iron atoms and avoids the direct contact between the iron atoms, thereby effectively controlling the sticking.
Highlights
The fluidized direct reduction process plays an important metallurgical role in the magnetization roasting of fine iron ore, the preheating of iron ore, the low-grade prereduction, and the production of direct reduced iron [1,2,3,4]
Through the carbon monoxide is used as a reducing gas and varying gas velocities, reduction pressures, investigation of the metallization rate, sticking ratio, and morphology in the hot state visual pressurized reduction temperatures, and particle sizes of fine iron ore articles are selected in the experiment
The proper range of gas linear velocity was determined by adjusting the gas flowing rate to observe the flowing state of the fine iron ore particles
Summary
The fluidized direct reduction process plays an important metallurgical role in the magnetization roasting of fine iron ore, the preheating of iron ore, the low-grade prereduction, and the production of direct reduced iron [1,2,3,4]. They show their advantages in process intensification, production capacity improvement, product mainly exists in a streamlined structure, and the high-pressure coarse-grained mosaic structure quantity, andwith economic benefits. Through the carbon monoxide is used as a reducing gas and varying gas velocities, reduction pressures, investigation of the metallization rate, sticking ratio, and morphology in the hot state visual pressurized reduction temperatures, and particle sizes of fine iron ore articles are selected in the experiment. Under visual pressurized fluidized bed experiment device of self-design, the optimum direction of different pressure conditions, the mechanism of carbon monoxide reduction in inhibiting sticking operation parameters is studied, and the economic, convenient, and effective operation parameters among fine iron ore particles and the mechanism of pressurized carbon monoxide in inhibiting sticking are obtained. Monoxide in inhibiting sticking loss are further analyzed, providing data and a theoretical reduction basis for the industrialization of the direct reduction process
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