钛精矿内配碳球团还原过程中的物相转变及还原产物电阻率研究

吴恩辉; 徐众; 李军; 侯静; 黄平; 张士举; 唐榕; 罗玉琴

doi:10.7513/j.issn.1004-7638.2024.01.005

钛精矿内配碳球团还原过程中的物相转变及还原产物电阻率研究

doi: 10.7513/j.issn.1004-7638.2024.01.005

吴恩辉^{1, 2,},
徐众^{1, 2},
李军^{1, 2},
侯静^{1, 2},
黄平^{1, 2},
张士举^{1, 2},
唐榕¹,
罗玉琴¹

1.
攀枝花学院钒钛学院, 四川攀枝花 617000
2.
钒钛资源综合利用四川省重点实验室, 四川攀枝花 617000

基金项目: 绿色催化四川省高校重点实验室开放基金项目（LYJ2102）；材料腐蚀与防护四川省重点实验室开放基金项目（2022CL31）；四川省高等学校重点实验室开放基金项目（TYNSYS-2020-Z-01，FQWLY-2021-Z-08）。

详细信息

作者简介:
吴恩辉，男，1984年出生，安徽泗县人，博士，副教授，研究领域：钒钛磁铁矿综合利用，E-mail：wuenhui1026@126.com

中图分类号: TF823,TF046
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出版历程
- 收稿日期: 2023-04-04
- 刊出日期: 2024-02-01

Phase transformation and electrical resistivity of reduced ilmenite concentrate carbon-containing pellets

Wu Enhui^{1, 2
,},
Xu Zhong^{1, 2},
Li Jun^{1, 2},
Hou Jing^{1, 2},
Huang Ping^{1, 2},
Zhang Shiju^{1, 2},
Tang Rong¹,
Luo Yuqin¹

1.
College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China
2.
Vanadium and Titanium Resources Comprehensive Utilization Key Laboratory of Sichuan Province, Panzhihua 617000, Sichuan, China

摘要

摘要: 以石墨粉为还原剂，研究钛精矿内配碳球团还原过程中的物相转变规律和还原产物的电阻率。结果表明，钛精矿内配碳球团的还原过程先后主要经历铁氧化物的还原和钛氧化物的还原两个过程，且提高还原温度、延长还原时间和增加石墨配比均有利于钛氧化物还原程度的加深；在还原时间为60 min，石墨配比为33.6%的条件下，还原温度由900 ℃提高到1550 ℃时，还原产物物相随温度升高的转变过程为：FeTiO₃→Fe+TiO₂→Fe+Ti_nO_2n−1（n≈1，2，3，4）→Fe+TiC。还原产物电阻率测试结果表明，还原温度和石墨配比对还原产物电阻率影响较大，还原时间影响较小；在石墨配比为33.6%，还原温度1300 ℃，还原时间为45 min的条件下，还原产物的电阻率的值为2.67×10⁻² Ω·cm。
- 钛精矿 /
- 内配碳球团 /
- 碳热还原 /
- 物相组成 /
- 电阻率
Abstract: Using the graphite powder as a reducing agent, the phase transformation and electrical resistivity of the reduced products during the reduction process of carbon-containing ilmenite concentrate pellets were studied. The XRD analysis results indicate that the reduction process of carbon-containing ilmenite concentrate pellets mainly undergoes two processes: the reduction of iron oxide and the reduction of titanium oxide. Increasing the reduction temperature, prolonging the reduction time, and increasing the graphite ratio are all beneficial in deepening the reduction degree of titanium oxide. With a reduction time of 60 min and a graphite ratio of 33.6%, the phase transformation process of the reduction products with increased reduction temperature from 900 ℃ to 1550 ℃ was as follows: FeTiO₃→Fe+TiO₂→Fe+Ti_nO_2n−1(n≈1,2,3,4)→Fe+TiC. The electrical resistivity test results of the reduction products show that the reduction temperature and graphite ratio have a significant impact on the electrical resistivity of the reduced products, while the reduction time has a small impact. Under the conditions of graphite ratio of 33.6%, reduction temperature of 1300 ℃, and reduction time of 45 min, the electrical resistivity of the reduced product was 2.67 × 10⁻² Ω·cm.
- ilmenite concentrate /
- carbon-containing pellet /
- carbothermal reduction /
- phase /
- electrical resistivity

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图 1 钛精矿的XRD谱

Figure 1. XRD pattern of ilmenite concentrate

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图 2 钛精矿的粒径分布

Figure 2. Particle size distribution of ilmenite concentrate

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图 3 不同还原温度条件下还原产物的物相组成

Figure 3. Phase composition of the reduced samples prepared at different reduction temperature

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图 4 不同还原时间条件下还原产物的物相组成

Figure 4. Phase composition of the reduced samples prepared for various reduction time

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图 5 不同石墨配比条件下还原产物的物相组成

Figure 5. Phase composition of the reduced samples prepared with different graphite ratio

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图 6 原料及不同工艺参数所得还原产物的电阻率

（a）原料；（b）还原温度；（c）石墨配比；（d）还原时间

Figure 6. Resistivity change plots of raw materials and reduced products with different reduction process parameters

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表 1 钛精矿的主要化学成分

Table 1. Main chemical composition of ilmenite concentrate %

TiO₂ FeO CaO MgO SiO₂ Al₂O₃ P₂O₅ SO₃ K₂O Cr₂O₃ MnO

46.70 42.03 0.59 5.13 2.26 1.00 0.10 0.65 0.03 0.15 0.77

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