铝酸亚铁非等温氧化动力学及机理研究

陈健; 王洪阳; 曹泽平; 汪佳瑶; 王子如

doi:10.13779/j.cnki.issn1001-0076.2023.01.007

铝酸亚铁非等温氧化动力学及机理研究

1.
安徽理工大学材料科学与工程学院, 安徽淮南232001

2.
安徽理工大学安徽省煤基固废新材料共性技术研究中心, 安徽淮南232001

基金项目: 国家自然科学基金(52004194)；安徽理工大学引进人才科研启动基金(2022yjrc25)；安徽高校协同创新项目(GXXT-2022-083)

详细信息

作者简介: 陈健（2002—），男，广西玉林人，本科生，主要研究方向为复杂矿石综合提取与利用，jchen0410@126.com

通讯作者: 王洪阳（1989—），男，河南永城人，博士，副教授，硕士生导师，主要研究方向为复杂矿石综合提取与利用，hywang3@aust.edu.cn。

中图分类号: TF821

收稿日期: 2022-11-29

刊出日期: 2023-02-15

Study on Kinetics and Mechanism of Non-isothermal Oxidation of Hercynite

1.
Anhui University of Science and Technology, School of Materials Science and Engineering, Huainan 232001, Anhui, China

2.
Anhui Generic Technology Research Center for New Materials from Coal-based Solid Wastes, Anhui University of Science and Technology, Huainan 232001, Anhui, China

More Information

Corresponding author: WANG Hongyang, hywang3@aust.edu.cn

Received Date: 29 November 2022

Publish Date: 15 February 2023

摘要

摘要:
铝酸亚铁的氧化分解对其后续拜耳法提取氧化铝具有重要意义。对铝酸亚铁的非等温氧化动力学进行研究，并借助XRD和XPS分析其氧化分解机理。结果表明：铝酸亚铁在650～900 K和900～1100 K氧化时分别受化学反应控制和内扩散控制，反应活化能分别为59.36 kJ/mol和20.69 kJ/mol。铝酸亚铁首先氧化分解为磁铁矿和γ-氧化铝，温度升高促使磁铁矿进一步氧化为γ-氧化铁并最终转变为稳定的α-氧化铁，而γ-氧化铝则转变为α-氧化铝。铝酸亚铁中的铁氧化物优先于氧化铝往颗粒表面迁移，从而对颗粒内部铝酸亚铁的氧化分解起到阻碍作用。该研究为降温过程中同步实现铝酸亚铁的氧化分解奠定理论基础。
- 铝酸亚铁 /
- 氧化动力学 /
- 氧化机理 /
- 氧化铁 /
- 氧化铝
Abstract:
The decomposition of hercynite through oxidation roasting is significant for the subsequent alumina extraction by Bayer process. In this work, the non-isothermal oxidation kinetics of hercynite was studied and the oxidation mechanism was investigated through the analysis methods of X-ray diffraction and X-ray photoelectron spectroscopy. The results showed that hercynite oxidation at 650～900 K and 900～1100 K was respectively controlled by chemical reaction and internal diffusion, and the corresponding reaction activation energies were 59.36 kJ/mol and 20.69 kJ/mol. Hercynite was firstly oxidized into Fe₃O₄ and γ-Al₂O₃, elevated temperature promoted the oxidation of Fe₃O₄ into γ-Fe₂O₃ and further into α-Fe₂O₃, meanwhile γ-Al₂O₃ was transformed into α-Al₂O₃. The migration of iron oxides to particle surface was prior to that of alumina in hercynite, thereby hindering the oxidation of particle interior. This study lays the foundation for the simultaneous oxidation of hercynite during cooling process.
- hercynite /
- oxidation kinetics /
- oxidation mechanism /
- hematite /
- alumina

HTML全文

图 1 铝酸亚铁的XRD(a)、PSD(b)及SEM(c, d)图

Figure 1.

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图 2 铝酸亚铁氧化时的TG和DTG曲线

Figure 2.

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图 3 铝酸亚铁氧化的反应率与温度的关系曲线

Figure 3.

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图 4 铝酸亚铁氧化过程动力学机理函数线性回归结果

Figure 4.

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图 5 铝酸亚铁在773 K (a)和1073 K (b)氧化焙烧产物的XRD图谱

Figure 5.

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图 6 铝酸亚铁在773 K (a)和1073 K (b)氧化焙烧产物的XPS图谱

Figure 6.

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图 7 铝酸亚铁氧化产物中Fe/Al摩尔比

Figure 7.

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表 1 铝酸亚铁氧化反应动力学方程可能的形式

Table 1. Possible kinetic equations during hercynite oxidation

No.	Kinetic equation	Control step
F₁(x)	1−(1−x)^1/3=k₁t	Chemical reaction
F₂(x)	x=k₂t	External diffusion
F₃(x)	1−2x/3−(1−x)^2/3=k₃t	Internal diffusion
注：x为反应率，t为反应时间，k为反应速率常数。

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