Isothermal Reduction and Avrami-Erofeev Kinetic Model for Reducing Iron Ore Pellets in a 70% N2-30% H2/CO Atmosphere

被引:0
作者
Wang, Shuo [1 ,2 ]
Shen, Fengman [1 ,2 ]
Zheng, Haiyan [1 ,2 ]
Nie, Xiaosen [1 ,2 ]
Jiang, Xin [1 ,2 ]
Gao, Qiangjian [1 ,2 ]
机构
[1] Northeastern Univ, Key Lab Ecol Met Multimet Mineral, Minist Educ, 3-11 Wenhua Rd, Shenyang 110819, Liaoning, Peoples R China
[2] Northeastern Univ, Sch Met, 3-11 Wenhua Rd, Shenyang 110819, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
Pellet; Hydrogen-rich reduction; Reduction behavior; Reduction kinetics; Activation energy; LOW-TEMPERATURE REDUCTION; OXIDE REDUCTION; COMPOSITE PELLETS; HYDROGEN;
D O I
10.1007/s40831-024-00903-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Effective utilization of hydrogen-rich reduction gases becomes imperative with advancements in reduction processes. In this study, the reduction processes of hematite pellets with different iron grades reduced by a reducing atmosphere (70% N-2-30% (H-2/CO = 0/2/5)) at 1123, 1173, and 1273 K were systematically investigated using a thermal analyzer. Kinetic analysis of hematite pellets was performed using the Avrami-Erofeev kinetic model. The porosity and pore size distribution of pellets A and B were determined using mercury intrusion porosimetry (MIP). The results show that a suitable pore size distribution and the addition of hydrogen are favorable for the reduction of pellet. Combined with the results of the pellet XRD, SEM-EDS, and MIP, the analysis of the pore size distribution and iron grade (TFe%) showed that a suitable pore size distribution (0.7-7 mu m) of the pellet had a greater effect on the degree of reduction than the iron grade of the pellet TFe%. Both pellets with different iron grades are mostly model as first-order (F1) at 1273 K and as geometrical contraction below 1223 K. When H-2 was added to the reducing gas for both pellets, the activation energy decreased to a large extent, from 92.72 to 78.73 kJ/mol and from 69.35 to 58.07 kJ/mol for pellets A and B, respectively. According to the reduction degree (R), reduction velocity index (RVI) and activation energy change rule of the ore after reduction, the suitable reduction process conditions for pellets A and B are 1273 K and 70% N-2-30% (H2/CO = 5) and 1223 K and 70% N-2-30% (H-2/CO = 2), respectively.
引用
收藏
页码:2337 / 2351
页数:15
相关论文
共 42 条
[1]   Kinetic Mechanism Development for the Direct Reduction of Single Hematite Pellets in H2/CO Atmospheres [J].
Ali, Mohammed Liaket ;
Fradet, Quentin ;
Riedel, Uwe .
STEEL RESEARCH INTERNATIONAL, 2022, 93 (12)
[2]   Reduction Behavior and Kinetics of Iron Ore Pellets under H2-N2 Atmosphere [J].
Bai, Ming-Hua ;
Long, Hu ;
Ren, Su-Bo ;
Liu, Dong ;
Zhao, Chang-Fu .
ISIJ INTERNATIONAL, 2018, 58 (06) :1034-1041
[3]   Chemo-mechanical phase-field modeling of iron oxide reduction with hydrogen [J].
Bai, Yang ;
Mianroodi, Jaber Rezaei ;
Ma, Yan ;
da Silva, Alisson Kwiatkowski ;
Svendsen, Bob ;
Raabe, Dierk .
ACTA MATERIALIA, 2022, 231
[4]   Solid state reaction kinetics of iron oxide reduction using hydrogen as a reducing agent [J].
Barde, Amey A. ;
Klausner, James F. ;
Mei, Renwei .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2016, 41 (24) :10103-10119
[5]   Kinetic analysis of the iron oxide reduction using hydrogen-carbon monoxide mixtures as reducing agent [J].
Bonalde, A ;
Henriquez, A ;
Manrique, M .
ISIJ INTERNATIONAL, 2005, 45 (09) :1255-1260
[6]   Hydrogen Reduction Kinetics of Hematite Concentrate Particles Relevant to a Novel Flash Ironmaking Process [J].
Chen, Feng ;
Mohassab, Yousef ;
Jiang, Tao ;
Sohn, Hong Yong .
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2015, 46 (03) :1133-1145
[7]   Water gas shift reaction for hydrogen production and carbon dioxide capture: A review [J].
Chen, Wei-Hsin ;
Chen, Chia-Yang .
APPLIED ENERGY, 2020, 258
[8]   Rate Controlling Step in the Reduction of Iron Oxides; Kinetics and Mechanism of Wustite-Iron Step in H2, CO and H2/CO Gas Mixtures [J].
El-Geassy, Abdel-Hady A. .
2017 2ND INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS RESEARCH AND MANUFACTURING TECHNOLOGIES (AMRMT 2017), 2017, 229
[9]   Risk Identification and Safety Technology for Hydrogen Production from Natural Gas Reforming [J].
Feng, Lele ;
Gu, Yifan ;
Pang, Jiabao ;
Jiang, Liangliang ;
Liu, Jie ;
Zhou, Hang ;
Wang, Biao ;
Babaee, Saeideh .
CHEMBIOENG REVIEWS, 2024, 11 (02) :386-405
[10]   The Influence of Nitrogen on Hydrogen Reduction of Iron Ore Pellets [J].
Fogelstrom, Julia Brannberg ;
Martinsson, Johan ;
Kojola, Niklas .
STEEL RESEARCH INTERNATIONAL, 2024, 95 (05)