scholarly journals A comprehensive investigation of the reaction behaviorial features of coke with different CRIs in the simulated cohesive zone of a blast furnace

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245124
Author(s):  
Qing Q. Lv ◽  
Yong S. Tian ◽  
Jun L. Zhou ◽  
Hua W. Ren ◽  
Guang H. Wang
Keyword(s):  
Blast Furnace ◽  
Cohesive Zone ◽  
Consumption Rate ◽  
Coke Quality ◽  
Temperature Zone ◽  
Comprehensive Investigation ◽  
Thermogravimetric Analyzer ◽  
Coke Reactivity ◽  
Reaction Characteristics ◽  
Carbon Molecules

The reaction characteristics and mechanism of coke with different coke reactivity indices (CRIs) in the high-temperature zone of a blast furnace should be fully understood to correctly evaluate the coke quality and optimize ironmaking. In this work, low-CRI coke (coke A) and high-CRI coke (coke B) were charged into a thermogravimetric analyzer to separately study their microstructural changes, gasification characteristics, and reaction mechanism under simulated cohesive zone conditions in a blast furnace. The results show that both coke A and coke B underwent pyrolysis, polycondensation, and graphitization during the heat treatment. The pyrolysis, polycondensation, gasification speed, and dissolution speed rates of coke B were higher than those of coke A. Direct and indirect reduction between sinter and coke occurred in the cohesive zone and had different stages. The consumption rate of coke B was faster than that of coke A during the coke–sinter reduction. The carbon molecules of coke A must absorb more energy to break away from the skeleton than those of coke B.

scholarly journals Phase Transformation of Cohesive Zone in a Water-quenched Blast Furnace

2018 ◽  
Vol 58 (10) ◽  
pp. 1775-1780 ◽  
Author(s):  
Xiaoyue Fan ◽  
Kexin Jiao ◽  
Jianliang Zhang ◽  
Kaidi Wang ◽  
Zhiyu Chang
Keyword(s):  
Phase Transformation ◽  
Blast Furnace ◽  
Cohesive Zone

Assessing the Gas Permeability of the Cohesive Zone in the Blast Furnace

2019 ◽  
Vol 49 (3) ◽  
pp. 179-184
Author(s):  
A. V. Kuzin ◽  
N. S. Khlaponin
Keyword(s):  
Blast Furnace ◽  
Cohesive Zone ◽  
Gas Permeability

scholarly journals Microstructure Change and Primary Slag Melting of Sinter in the Cohesive Zone of a Blast Furnace

2015 ◽  
Vol 55 (6) ◽  
pp. 1223-1231 ◽  
Author(s):  
Miyuki Hayashi ◽  
Kyohei Suzuki ◽  
Yasuhiro Maeda ◽  
Takashi Watanabe
Keyword(s):  
Blast Furnace ◽  
Cohesive Zone ◽  
Microstructure Change ◽  
Slag Melting

scholarly journals Relationship and Mechanism Analysis of Soft-Melt Dropping Properties and Primary-Slag Formation Behaviors of the Mixed Burden in Increasing Lump Ore Ratio

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1254 ◽  
Author(s):  
Yun-Fei Li ◽  
Zhi-Jun He ◽  
Wen-Long Zhan ◽  
Wei-Guo Kong ◽  
Peng Han ◽  
...  
Keyword(s):  
Pressure Difference ◽  
Cohesive Zone ◽  
Gas Permeability ◽  
Effective Means ◽  
Maximum Pressure ◽  
Slag Formation ◽  
Mechanism Analysis ◽  
Temperature Zone ◽  
Slag Properties ◽  
The Relationship

At present, cost reduction and environmental protection are the mainstream of blast furnace (BF) development and the high lump ore ratio is an effective means. Therefore, it is significant to explore the relationship and mechanism of burden soft-melt dropping and its primary-slag formation behaviors under increasing lump ore ratio. In this paper, the melt–drop test is carried out on the single ore and mixed burden, and obtained primary-slag properties are subjected to analysis. The experimental results show that the primary-slag of lump ore contains a large amount of FeO and SiO2, so it simply produces many low melting point compounds, which cause terrible soft-melt dropping properties and primary-slag formation behaviors. Notably, mixing with sinter and pellet can effectively improve both the properties. With the increase in lump ore ratio, the CaO in the primary-slag decreases, FeO and SiO2 increase, resulting in the melting temperature of the primary-slag sequentially decreasing and the cohesive zone moves to the low temperature zone. In addition, the maximum pressure difference increases, and the gas permeability deteriorates. Increasing the sinter ratio can overcome the defect of high lump ore ratio that can effectively improve the poor softening performance, melting performance and the position and thickness of the cohesive zone. However, because of the pulverization performance, the maximum pressure difference and gas permeability of the burden become worse.

scholarly journals Modeling of Blast Furnace with Layered Cohesive Zone

2010 ◽  
Vol 41 (2) ◽  
pp. 330-349 ◽  
Author(s):  
X.F. Dong ◽  
A.B. Yu ◽  
S.J. Chew ◽  
P. Zulli
Keyword(s):  
Blast Furnace ◽  
Cohesive Zone

Melting Features and Viscosity of TiO2-Containing Primary Slag in a Blast Furnace

2018 ◽  
Vol 37 (2) ◽  
pp. 149-156 ◽  
Author(s):  
Kexin Jiao ◽  
Jianliang Zhang ◽  
Zhiyu Wang ◽  
Yanxiang Liu ◽  
RenZe Xu
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Low Temperature ◽  
Cohesive Zone ◽  
Solid Phase ◽  
Slag System ◽  
Silicate Network ◽  
Network Modifier ◽  
Blast Furnace Ironmaking ◽  
Ironmaking Process

AbstractThe performance of the primary slag in the cohesive zone of blast furnace is critical for smooth operation of blast furnace ironmaking process. In the present work, the CaO–SiO2–MgO–TiO2–Al2O3–FeO slag system was studied to identify the influence of the FeO and the TiO2 on the melting features and viscosity. The temperatures of melting features are found to decrease with increasing FeO from 5 wt% to 20 wt% and increase with increasing TiO2 from 5 wt% to 15 wt%. The viscosities of the slag change with TiO2 can be divided into four periods, which are slow period, rapid period, slow down period and dramatically rise period. The introduction of TiO2 into silicate network performs as network modifier at high temperature and network former at a relative low temperature. FeO can decrease the effect of Ti2O64– chain units and decrease the precipitation temperature of the solid phase.

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