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Advances in Materials Science and Engineering
Volume 2017, Article ID 1019438, 8 pages
https://doi.org/10.1155/2017/1019438
Research Article

Effects of Treated Cow Dung Addition on the Strength of Carbon-Bearing Iron Ore Pellets

1School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, China
2School of Metallurgy, Northeastern University, Shenyang 110819, China
3Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Anhui University of Technology, Ministry of Education, Ma’anshan 243002, China

Correspondence should be addressed to Hong-ming Long; moc.621@mhlfay

Received 25 June 2017; Accepted 25 September 2017; Published 2 November 2017

Academic Editor: Merrick Mahoney

Copyright © 2017 Qing-min Meng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It is of particular interest to use biomass as an alternative source of fuel in direct-reduction ironmaking to ease the current reliance on fossil fuel energy. The influence of cow dung addition on the strength of carbon-bearing iron ore pellets composed of cow dung, iron ore, anthracite, and bentonite was investigated, the quality of green and dry pellet was evaluated based on FTIR analysis, and the mechanism of strength variation of the reduced pellets was investigated by analysing the phase composition and microstructure using XRD and SEM. The results show that cow dung addition decreased the green pellet strength due to expansion of the amorphous region of the cellulose in the cow dung; however, the dry pellet strength increased substantially. In the process of reduction roasting, it was found that cow dung addition can promote aggregation of iron crystals and increase the density of the pellets, resulting in increased strength of the reduction roasted pellets, while excessive cow dung addition resulted in lower strength.