Recycling of iron from red mud by magnetic separation after co-roasting with pyrite

被引：60

作者：

Liu, Yanyan ^{[1
]}

Zhao, Bochao ^{[1
]}

Tang, Yang ^{[1
]}

Wan, Pingyu ^{[1
]}

Chen, Yongmei ^{[1
]}

Lv, Zijian ^{[2
]}

机构：

[1] Beijing Univ Chem Technol, Natl Fundamental Res Lab New Hazardous Chem Asses, Beijing 100029, Peoples R China

[2] Aluminum Corp Ltd China, Henan Branch, Zhengzhou 450041, Peoples R China

来源：

THERMOCHIMICA ACTA | 2014年 / 588卷

基金：

中国国家自然科学基金;

关键词：

Red mud; Iron recycle; Magnetic separation; Hematite; Magnetite; Pyrite; REDUCTION; HEMATITE; DECOMPOSITION; KINETICS;

D O I：

10.1016/j.tca.2014.04.027

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A recycling process of iron from red mud by magnetic separation is proposed, in which iron oxide (Fe2O3) in red mud transforms to magnetite (Fe3O4) by anaerobic co-roasting with pyrite (FeS2).TG-DTA and XRD results showed that hematite was reduced to magnetite by the thermo-decomposed compounds (iron monosulfide, pyrrhotite and element sulfur) of pyrite. The mole ratio of pyrite to hematite and the roasting temperature effected the transformation. In the simulated experiment, 30 g red mud containing 9.24% of iron (13.2% in Fe2O3) mixed with 0.74g pyrite were roasted at 600 degrees C under N-2 atmosphere for 30 min. 4.5 g magnetic material (with Fe content of 36.9%) was magnetically separated, and the remaining solid only containing 0.61% of Fe (0.87% in Fe2O3), being able to meet the stipulated standard of 2% for refractory material manufacture. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：11 / 15

页数：5

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