碳酸钠辅助碳热还原钒钛磁铁矿

陈陆铭; 甄玉兰; 张国华; 陈德胜; 王丽娜; 赵宏欣; 孟凡成; 齐涛

doi:10.1007/s12613-020-2160-7

Volume 29 Issue 2

Feb. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(2): 239-247

Luming Chen, Yulan Zhen, Guohua Zhang, Desheng Chen, Lina Wang, Hongxin Zhao, Fancheng Meng, and Tao Qi, Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 239-247. https://doi.org/10.1007/s12613-020-2160-7

Cite this article as:

Luming Chen, Yulan Zhen, Guohua Zhang, Desheng Chen, Lina Wang, Hongxin Zhao, Fancheng Meng, and Tao Qi, Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 239-247. https://doi.org/10.1007/s12613-020-2160-7

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研究论文

碳酸钠辅助碳热还原钒钛磁铁矿

1)
过程工程研究所湿法冶金国家工程实验室，北京 100190，中国
2)
中国科学院大学化学工程学院，北京 100190，中国
3)
北京科技大学钢铁冶金国家重点实验室，北京 100083，中国

通讯作者:
甄玉兰 E-mail: zhenzhen9545@126.com

文章亮点

(1) 系统研究了温度、碱矿比、碳矿比对碳酸钠辅助碳热还原钒钛磁铁矿产物相转变的影响。
(2) 明确了碳酸钠和钒钛磁铁矿焙烧反应机理。
(3) 提出碳酸钠加快还原速度，同时降低渣相黏度，增加渣-铁分离效率。

中文摘要

碳酸钠辅助碳热还原钒钛磁铁矿工艺具有一步熔炼，高效分离提取钒、钛的优势。然而，碳酸钠在反应中的作用以及反应机理尚未系统研究。本文在1073–1473 K的反应温度和氩气气氛下，研究了在碳酸钠辅助下钒钛磁铁精矿的碳热还原过程，并通过X射线衍射和扫描电子显微镜研究了反应过程的相转变。研究结果表明，钒钛磁铁矿、石墨和碳酸钠的质量比为100：25：60，温度为1473 K为较好的反应条件。通过研究碳酸钠和钒钛磁铁矿的焙烧过程，发现熔融碳酸钠和酸性氧化物（如Fe₂O₃, TiO₂, Al₂O₃和SiO₂）结合，破坏钒钛磁铁矿的结构，形成富含钠的熔体，同时释放出FeO和MgO。因此，碳酸钠加快了铁氧化物的还原速率。此外，碳酸钠的加入降低了熔渣的黏度，有利于还原铁颗粒的团聚和渣-铁分离。因此，碳酸钠辅助碳热还原是一种具备良好前景的低温处理钒钛磁铁矿的方法。

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Research Article

Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate

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Abstract

Abstract

The carbothermic reduction of vanadium titanomagnetite concentrate (VTC) with the assistance of Na₂CO₃ was conducted in an argon atmosphere between 1073 and 1473 K. X-ray diffraction and scanning electron microscopy were used to investigate the phase transformations during the reaction. By investigating the reaction between VTC and Na₂CO₃, it was concluded that molten Na₂CO₃ broke the structure of titanomagnetite by combining with the acidic oxides (Fe₂O₃, TiO₂, Al₂O₃, and SiO₂) to form a Na-rich melt and release FeO and MgO. Therefore, Na₂CO₃ accelerated the reduction rate. In addition, adding Na₂CO₃ also benefited the agglomeration of iron particles and the slag–metal separation by decreasing the viscosity of the slag. Thus, Na₂CO₃ assisted carbothermic reduction is a promising method for treating VTC at low temperatures.
- vanadium titanomagnetite;
- sodium carbonate;
- phase transformation;
- carbothermic reduction;
- slag–metal separation

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