铝的赋存形式及含量对铁矿球团固结特性的影响机理

田宏宇; 朱德庆; 潘建; 杨聪聪; 黄伟群; 储满生

doi:10.1007/s12613-023-2725-3

Volume 30 Issue 12

Dec. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(12): 2334-2346

Hongyu Tian, Deqing Zhu, Jian Pan, Congcong Yang, Weiqun Huang, and Mansheng Chu, Effect mechanism of aluminum occurrence and content on the induration characteristics of iron ore pellets, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2334-2346. https://doi.org/10.1007/s12613-023-2725-3

Cite this article as:

Hongyu Tian, Deqing Zhu, Jian Pan, Congcong Yang, Weiqun Huang, and Mansheng Chu, Effect mechanism of aluminum occurrence and content on the induration characteristics of iron ore pellets, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2334-2346. https://doi.org/10.1007/s12613-023-2725-3

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研究论文

铝的赋存形式及含量对铁矿球团固结特性的影响机理

1)
东北大学冶金学院, 沈阳 110819, 中国
2)
中南大学资源加工与生物工程学院, 长沙 410083, 中国
3)
江西省地质局生态地质大队, 南昌 330030, 中国
4)
低碳钢铁前沿技术教育部工程研究中心, 沈阳 110819, 中国

通讯作者:
杨聪聪 E-mail: smartyoung@csu.edu.cn

文章亮点

(1) 系统地研究了铝的赋存形式和含量对铁矿球团固结性能的影响规律；

(2) 明确了不同赋存形式铝的热力学特性；

(3) 分析了铝在氧化球团中的存在形式；

(4) 揭示了铝在氧化球团中的迁移规律。

中文摘要

随着高品位铁矿石的不断消耗，铁精矿中铝含量的不断增加已不可避免，对球团工艺产生了不利影响。因此，铝元素对球团质量的影响机理亟需明晰。在本研究中，通过添加氧化铝、铝针铁矿、三水铝石和高岭土等相应的含铝添加剂研究了铝的赋存形式和含量对赤铁矿和磁铁矿球团固结特性的影响。利用系统的工艺矿物学分析结合铝的不同赋存形式下的热力学特性及固结行为定量分析以明确相关的机理。结果显示，不同赋存形式下的铝对球团的固结行为产生了不利影响，特别是Al₂O₃含量超过2.0wt%时影响更为显著。三水铝石和高岭土更易产生内应力和微细裂纹，从而阻碍相应的微晶键连接及赤铁矿颗粒的重结晶。不同赋存形式下的铝对焙烧球团固结特性的不利影响可以通过在赤铁矿颗粒间形成液相粘结得到缓解。相较铝的其他赋存形式，高岭土由于可以形成较多的液相更有利于球团的固结。研究结果可以进一步揭示铁精矿中铝的赋存形式和含量对下游加工工序的影响，并对高铝铁精矿的利用提供指导。

关键词:

Research Article

Effect mechanism of aluminum occurrence and content on the induration characteristics of iron ore pellets

+ Author Affiliations

1)
School of Metallurgy, Northeastern University, Shenyang 110819, China
2)
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
3)
Ecological Geology Brigade of Jiangxi Geological Bureau, Nanchang 330030, China
4)
Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking (Ministry of Education), Shenyang 110819, China

Mansheng Chu is an editorial board member for IJMMM and is not involved in the editorial review or the decision to publish this article. The authors declare no potential conflict of interest.

Corresponding author:
Congcong Yang E-mail: smartyoung@csu.edu.cn
Received: 31 March 2023; Revised: 20 July 2023; Accepted: 11 August 2023; Available online: 18 August 2023

Abstract

Abstract

With the intensified depletion of high-grade iron ores, the increased aluminum content in iron ore concentrates has become unavoidable, which is detrimental to the pelletization process. Therefore, the effect mechanism of aluminum on pellet quality must be identified. In this study, the influence of aluminum occurrence and content on the induration of hematite (H) and magnetite (M) pellets was investigated through the addition of corresponding Al-containing additives, including alumina, alumogoethite, gibbsite, and kaolinite. Systematic mineralogical analysis, combined with the thermodynamic properties of different aluminum occurrences and the quantitative characterization of consolidation behaviors, were conducted to determine the related mechanism. The results showed that the alumina from various aluminum occurrences adversely affected the induration characteristics of pellets, especially at an aluminum content of more than 2.0wt%. The thermal decomposition of gibbsite and kaolinite tends to generate internal stress and fine cracks, which hinder the respective microcrystalline bonding and recrystallization between Fe₂O₃ particles. The adverse effect on the induration characteristics of fired pellets with different aluminum occurrences can be relieved to varying degrees through the formation of liquid phase bonds between the hematite particles. Kaolinite is more beneficial to the induration process than the other three aluminum occurrences because of the formation of more liquid phase, which improves pellet consolidation. The research results can further provide insights into the effect of aluminum occurrence and content in iron ore concentrates on downstream processing and serve as a guide for the utilization of high-alumina iron ore concentrates in pelletization.
- iron ore;
- pellet;
- aluminum occurrence;
- consolidation behavior;
- element migration

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