Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China

Guang Wang; Ya-xing Du; Jing-song Wang; Qing-guo Xue

doi:10.1007/s12613-018-1543-5

Volume 25 Issue 1

Jan. 2018

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文章导航 > 矿物冶金与材料学报（英文） > 2018 > 25(1): 28-36

Guang Wang, Ya-xing Du, Jing-song Wang, and Qing-guo Xue, Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp. 28-36. https://doi.org/10.1007/s12613-018-1543-5

Cite this article as:

Guang Wang, Ya-xing Du, Jing-song Wang, and Qing-guo Xue, Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp. 28-36. https://doi.org/10.1007/s12613-018-1543-5

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研究论文

Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

通讯作者:
Guang Wang E-mail: wangguang@ustb.edu.cn

中文摘要

To support the development of technology to utilize low-grade Ti-Nb-bearing Fe concentrate, the reduction of the concentrate by coal was systematically investigated in the present paper. A liquid phase formed when the Ti-Nb-bearing Fe concentrate/coal composite pellet was reduced at temperatures greater than 1100℃. The addition of CaCO₃ improved the reduction rate when the slag basicity was less than 1.0 and inhibited the formation of the liquid phase. Mechanical milling obviously increased the metallization degree compared with that of the standard pellet when reduced under the same conditions. Evolution of the mineral phase composition and microstructure of the reduced Ti-Nb-bearing Fe concentrate/coal composite pellet at 1100℃ were analyzed by X-ray diffraction and scanning electron microscopy-energy-dispersive spectroscopy. The volume shrinkage value of the reduced Ti-Nb-bearing Fe concentrate/coal composite pellet with a basicity of 1.0 was approximately 35.2% when the pellet was reduced at 1100℃ for 20 min, which enhanced the external heat transfer to the lower layers when reduced in a practical rotary hearth furnace. The present work provides key parameters and mechanism understanding for the development of carbothermic reduction technology of a Ti-Nb-bearing Fe concentrate incorporated in a pyrometallurgical utilization flow sheet.

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Research Article

Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China

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Abstract

Abstract

To support the development of technology to utilize low-grade Ti-Nb-bearing Fe concentrate, the reduction of the concentrate by coal was systematically investigated in the present paper. A liquid phase formed when the Ti-Nb-bearing Fe concentrate/coal composite pellet was reduced at temperatures greater than 1100℃. The addition of CaCO₃ improved the reduction rate when the slag basicity was less than 1.0 and inhibited the formation of the liquid phase. Mechanical milling obviously increased the metallization degree compared with that of the standard pellet when reduced under the same conditions. Evolution of the mineral phase composition and microstructure of the reduced Ti-Nb-bearing Fe concentrate/coal composite pellet at 1100℃ were analyzed by X-ray diffraction and scanning electron microscopy-energy-dispersive spectroscopy. The volume shrinkage value of the reduced Ti-Nb-bearing Fe concentrate/coal composite pellet with a basicity of 1.0 was approximately 35.2% when the pellet was reduced at 1100℃ for 20 min, which enhanced the external heat transfer to the lower layers when reduced in a practical rotary hearth furnace. The present work provides key parameters and mechanism understanding for the development of carbothermic reduction technology of a Ti-Nb-bearing Fe concentrate incorporated in a pyrometallurgical utilization flow sheet.
- Ti-Nb bearing iron concentrate;
- carbothermic reduction;
- basicity;
- mechanical milling;
- volume shrinkage

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Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China

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Carbothermic reduction behaviors of Ti-Nb-bearing Fe concentrate from Bayan Obo ore in China

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