Reduction and melting behavior of carbon composite lateritic bauxite pellets

Ying-yi Zhang; Jie Zhao; Yuan-hong Qi; Xiang-li Cheng; Zong-shu Zou

doi:10.1007/s12613-015-1083-1

Volume 22 Issue 4

Apr. 2015

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文章导航 > 矿物冶金与材料学报（英文） > 2015 > 22(4): 381-388

Ying-yi Zhang, Jie Zhao, Yuan-hong Qi, Xiang-li Cheng, and Zong-shu Zou, Reduction and melting behavior of carbon composite lateritic bauxite pellets, Int. J. Miner. Metall. Mater., 22(2015), No. 4, pp. 381-388. https://doi.org/10.1007/s12613-015-1083-1

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Ying-yi Zhang, Jie Zhao, Yuan-hong Qi, Xiang-li Cheng, and Zong-shu Zou, Reduction and melting behavior of carbon composite lateritic bauxite pellets, Int. J. Miner. Metall. Mater., 22(2015), No. 4, pp. 381-388. https://doi.org/10.1007/s12613-015-1083-1

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Reduction and melting behavior of carbon composite lateritic bauxite pellets

State Key Laboratory of Advance Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China
School of Material and Metallurgy, Northeast University, Shenyang 110819, China

通讯作者:
Ying-yi Zhang

中文摘要

Direct reduction of low-grade lateritic bauxite was studied at high temperature to recover Fe and beneficiate Al₂O₃ slag. The results show that a metallization rate of 97.9% and a nugget recovery rate of 85.1% can be achieved when the reducing and melting temperatures are 1350 and 1480℃, respectively. Moreover, a higher-grade calcium aluminate slag (Al₂O₃=50.52wt%) can also be obtained, which is mainly composed of α-Al₂O₃, hercynite (FeAl₂O₄), and gehlenite (Ca₂Al₂SiO₇). In addition, high-quality iron nuggets have been produced from low-grade lateritic bauxite. The nugget is mainly composed of iron (93.82wt%) and carbon (3.86wt%), with almost no gangue (slag).

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Reduction and melting behavior of carbon composite lateritic bauxite pellets

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Abstract

Abstract

Direct reduction of low-grade lateritic bauxite was studied at high temperature to recover Fe and beneficiate Al₂O₃ slag. The results show that a metallization rate of 97.9% and a nugget recovery rate of 85.1% can be achieved when the reducing and melting temperatures are 1350 and 1480℃, respectively. Moreover, a higher-grade calcium aluminate slag (Al₂O₃=50.52wt%) can also be obtained, which is mainly composed of α-Al₂O₃, hercynite (FeAl₂O₄), and gehlenite (Ca₂Al₂SiO₇). In addition, high-quality iron nuggets have been produced from low-grade lateritic bauxite. The nugget is mainly composed of iron (93.82wt%) and carbon (3.86wt%), with almost no gangue (slag).
- bauxite;
- ore pellets;
- direct reduction process;
- melting behavior;
- metallization