Reduction mechanism of composite consisted of coal and hematite ore by volatile matter at 700-1 100 K

Yuki Takyu, Taichi Murakami, Sang Han Son, Eiki Kasai

研究成果: Article査読

11 被引用数 (Scopus)

抄録

In the drive to mitigate global warming, the iron and steel industry has made efforts to reduce carbon dioxide gas emissions. Utilization of a composite material consisting of carbonaceous material and iron ore is expected to be an effective way to solve the issue. Volatile matters in carbonaceous materials have a potential to reduce emissions by lowering the reduction temperature. In this study, the reduction by volatile matter in a coal/hematite ore composite was fundamentally examined. Different kinds of coal were chosen as carbonaceous material samples. The reduction experiment using the prepared composites was conducted by varying the heating rate as 0. 08, 0.17, and 0.33 K/s, up to a temperature of 1 473 K under Ar-5%N2 gas flow. The outlet gas composition was analyzed and the results were used to calculate the reduction degree. Reduction degree of hematite ore initially increases with increasing content of volatile matter in coal. However, beyond a certain point, further increase in the volatile matter content of the coal did not give a significant change in the reduction degree. For the evaluated coals, the amounts and types of gases generated are not different each other. H2 gas seems to form together with solid carbon via decomposition of hydrocarbon gases. Such gases and solid carbon may contribute to the reduction. Moreover, reduction by H2 was promoted in the early stage of the reactions by decreasing heating rate. The data indicate that control of the heating rate is a possible way to promote reduction at low temperature.

本文言語English
ページ(範囲)1188-1196
ページ数9
ジャーナルIsij International
55
6
DOI
出版ステータスPublished - 2015

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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