Abstract
To improve the fluidization of the fluidized bed in ironmaking, the particle loss and bonding during the fluidized bed are largely removed by changing the properties of the particle surface or by adding an external field. Currently, the vibration, magnetic, sound, and electric fields have been commonly applied to provide external energy to the fluidization bed systems. In this work, experiments are conducted for Newman ore particles under the application of an external sound field at a reduction temperature of 1023 K, linear velocity of 0.6 m/s, duration of 60 min, pressure of 0.2 MPa, and typical mineral powder particle size of 80–100 mesh, with H2 used as the reducing gas. The power and frequency of the ultrasonic field are varied, and the effects of sound field are evaluated by the comparative analysis of the effects of the sound field with different powers of sound fields and application times on the metallization rate and binder ratio of the samples. The acoustic pressure and frequency were varied to determine the critical speed and influence on the bed and to study the interactions of the iron ore powder particles in the sound field and the bonding mechanism of the particles. The results of this paper reproduce the actual particle fluidization process and analysis of the interactions of the particles in the sound field well. The influence of the external sound field on the gas-solid flow was studied from the perspective of macroscopic motion and force analysis.
Highlights
The promulgation and implementation of new environmental protection laws and the policy of reducing metallurgical production capacity poses a great challenge for the survival of smelting processes with high emissions, high energy consumption and high pollution
The measured metallization rate and bond ratio obtained with the addition of sound fields of different powers and times are shown in Tables 2 and 3
The results show that in the absence of the sound the fluidization process of the iron ore powder was similar to that of the other ultrafine field, the fluidization process of the iron ore powder was similar to that of the other ulpowders and still through the three stages of piston flow,flow, channel flow, and trafine powders andproceeded still proceeded through the three stages of piston channel flow, agglomeration fluidization
Summary
The promulgation and implementation of new environmental protection laws and the policy of reducing metallurgical production capacity poses a great challenge for the survival of smelting processes with high emissions, high energy consumption and high pollution. Fluidized bed ironmaking technology can directly use iron ore powder as the raw material to eliminate the process of coking and sintering. Because the fluidization process does not require coke, it can reduce the dependence on coking coal and avoid the environmental pollution caused by coking. Fluidization enables good mixing of the gas and solid phases, which enhances the heat and mass transfer and improves kinetic conditions, leading to increased production efficiency and reduced environmental pollution [4,5,6].
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