Effects of alkali metal on solution loss and coke degradation

Yu, Dongsheng; Guo, Rui; Liang, Yeru; Liu, Lianji; Chen, Peng

doi:10.1051/metal/2019041

Cited by 3 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results indicated that the reactivity of coke gradually increased and the strength of coke gradually deteriorated with as the alkali compound content increased after gasification under different temperatures. Zhao et al 23 and Yu et al 24 found that both K and Na vapors might promote the gasification and dissolution reaction of coke; however, the catalytic effect of K on the gasification and dissolution reaction of coke was stronger than that of Na. The above investigations showed that alkali compounds might deteriorate the quality of coke, but few studies have been conducted on the variability of the radial dissolving loss of coke particles during alkali-rich coke gasification reactions.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Catalytic Effect of Alkali Metals on the Gasification Dissolution Reaction and Deep Reaction Behavior of Metallurgical Cokes

Zhang

2022

ACS Omega

View full text Add to dashboard Cite

In this paper, the deep reaction behaviors of tamping and top-charging cokes with different K 2 CO 3 and Na 2 CO 3 contents were investigated and the evolution of the functional group structure and the carbon structure of coke with the extension of the deep reaction was clarified. The results showed that the deep reaction gasification of coke steadily increased with the K 2 CO 3 and Na 2 CO 3 content. However, the catalytic effect of different contents of K 2 CO 3 seemed to be stronger than that of different contents of Na 2 CO 3 . Meanwhile, the catalytic effect of alkali metals on the gasification reaction of tamping coke was more significant. The gasification dissolution of coke gradually decreased from the outside to the inside of the particle with the extension of the deep reaction, while the catalytic effect of K 2 CO 3 and Na 2 CO 3 seemed to be more dramatic on surface of the coke particle. In contrast, the gasification dissolution reaction on the surface of tamping coke was more severe; consequently, the surface pore area of tamping coke was much higher than that of top-charging coke. According to the variations in the functional group structure of cokes, aromatic hydrocarbon gradually became the dominant functional group in the coke structure with the extension of the deep reaction. The above variation led to a gradual decrease in the reactivity of coke, though the decomposition reactions of oxygen-containing functional groups in coke were promoted to some extent by the addition of K 2 CO 3 . With the extension of the deep reaction of coke, amorphous carbon was gradually transformed into sequential carbon.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catalytic Effect of Alkali Metals on the Gasification Dissolution Reaction and Deep Reaction Behavior of Metallurgical Cokes

Zhang

2022

ACS Omega

View full text Add to dashboard Cite

show abstract

Degradation behaviors of coke under complex solution loss conditions

Zhang

Guo

et al. 2020

Metall. Res. Technol.

View full text Add to dashboard Cite

Solution loss reaction of coke provides reducing agent for ironmaking, which is an important chemical reaction in blast furnace. The coke itself is also degraded by the loss of carbon. In this paper, the degradation behavior of coke under complex conditions including alkali metal enrichment, simulated blast furnace temperature and atmosphere was studied. The pore size and pore wall thickness distribution of coke were measured by a microscope to characterize the structure of coke. The gasification reaction rate of coke matrix was measured by a thermogravimetric analyzer to characterize the matrix reactivity of coke. The results show that a coke has high CRI and low CSR, but it has high matrix reactivity and thick pore wall, which may lead higher strength after solution loss under alkali metal enrichment and simulated blast furnace atmosphere and heating conditions.

show abstract

Study on deterioration behavior of coke during gasification

Wu,

Liang,

Gan

et al. 2023

Metall. Res. Technol.

View full text Add to dashboard Cite

The reaction temperature and time on the carbon loss of coke during CO2 gasification were studied. The results showed that there were significant correlations among the reactivity, pulverization rate, and wear resistance. The degree of variation in pulverization rate and wear resistance revealed that coke reactivity changed dramatically as reaction temperature rose. The temperature was also the key factor for coke graphitization. The evolution of the inorganic minerals and pore wall microstructure was investigated after coke gasification. The migration and accumulation of inorganic minerals, such as mullite, calcium ferrite, and iron oxide in coke, were discovered to catalyze the deterioration of the coke pore wall, resulting in the coke powder formation. The graphitization degree of the skin layer was greater than that of the core after high-temperature reactions, which accelerated skin layer separation from the core.

show abstract

Effects of alkali metal on solution loss and coke degradation

Cited by 3 publications

References 20 publications

Catalytic Effect of Alkali Metals on the Gasification Dissolution Reaction and Deep Reaction Behavior of Metallurgical Cokes

Catalytic Effect of Alkali Metals on the Gasification Dissolution Reaction and Deep Reaction Behavior of Metallurgical Cokes

Degradation behaviors of coke under complex solution loss conditions

Study on deterioration behavior of coke during gasification

Contact Info

Product

Resources

About