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Advances in Materials Science and Engineering
Volume 2018, Article ID 2138268, 6 pages
https://doi.org/10.1155/2018/2138268
Research Article

Carbothermal Reduction of Iron Ore in Its Concentrate-Agricultural Waste Pellets

1School of Metallurgical and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, Hunan, China
2State Key Laboratory of Refractory Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China

Correspondence should be addressed to Xuegong Bi; moc.qq@1165955751

Received 22 May 2017; Accepted 24 August 2017; Published 17 January 2018

Academic Editor: Liming Lu

Copyright © 2018 Zhulin Liu 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

Carbon-containing pellets were prepared with the carbonized product of agricultural wastes and iron concentrate, and an experimental study on the direct reduction was carried out. The experimental results demonstrated that carbon-containing pellets could be rapidly reduced at 1200 to 1300°C in 15 minutes, and the proper holding time at high temperature was 15 to 20 min. The degree of reduction gradually increased with temperature rising, and the appropriate temperature of reducing pellets was 1200°C. The weight loss rate and reduction degree of pellets increased with the rise of carbon proportion, and the relatively reasonable mole ratio of carbon to oxygen was 0.9. A higher content of carbon and an appropriate content of volatile matters in biomass char were beneficial to the reduction of pellets. The carbon-containing pellets could be reduced at high speeds in the air, but there was some reoxidization phenomenon.