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Coupled Typical Coke Gasification and Sintering Ore Reduction in CO-N2-H2
Jinglan Hu1, Yuelin Qin1,2, Xin Li1
1School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing401331, China.
ACS Omega
|October 3, 2022
Summary
This study investigated coke gasification and ore reduction in a mixed gas. Low-reactivity coke demonstrated superior performance, yielding higher reduction degrees and better strength post-reaction.
Area of Science:
- Materials Science
- Chemical Engineering
- Metallurgy
Background:
- Understanding the interaction between coke properties and reduction processes is crucial for optimizing industrial operations.
- Coke reactivity significantly influences gasification and reduction efficiencies in high-temperature environments.
Purpose of the Study:
- To investigate the coupling behavior of high- and low-reactivity coke gasification with sintering ore reduction.
- To analyze the evolution of coke carbon and pore structures under specific gas conditions.
- To compare the performance of high- and low-reactivity cokes in a CO-N2-H2 mixed gas environment.
Main Methods:
- Thermodynamic calculations were employed to model the reactions.
- High-temperature simulation experiments were conducted.
- Analysis of coke carbon structure and pore structure evolution was performed.
Main Results:
- Reaction rates for both coke types increased with temperature post-coupling.
- Coke strength decreased with increasing temperature, with low-reactivity coke showing higher post-reaction strength.
- Low-reactivity coke resulted in a higher reduction degree of sintering ore.
- High-reactivity coke strength exceeded 60.4% under specific high-temperature, hydrogen-rich conditions.
Conclusions:
- Low-reactivity coke is more effective in sintering ore reduction and maintains better strength under reaction conditions.
- The graphitization degree and carbon structure order of low-reactivity coke are superior.
- Optimizing coke properties is key to enhancing reduction efficiency and material integrity.
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