2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 6: Yagi Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Akiyama T, Nogami H, Saito K, Fujibayashi A |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 480 pages |
| ISBN: | 978-1-987820-46-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Reduction behavior and crushing strength of carbon-containing composites prepared from a limonite-based pellet and COG tar
Yuuki Mochizuki1; Megumi Nishio1; Naoto Tsubouchi1; Tomohiro Akiyama1;1HOKKAIDO UNIVERSITY, Sapporo, Japan;
Type of Paper: Regular
Id Paper: 34
Topic: 3
Abstract:
The development of technology for the production of ironmaking resources with high-reactivity and low reduction disintegration is necessary. In this study, we thus first prepare an iron oxide/carbonaceous materials composite (carbon-containing pellet) from coke oven gas (COG) tar and a limonite-based pellet (LP), in which the carbonaceous material is completely filled into the pores of the pellets. The crushing strength and reduction behavior of the composite prepared from LP and COG tar are then investigated. The peak of the pore size distribution profile, at around 2 nm, observed in the as-prepared LP completely disappears for the composites prepared, and the SBET and VBJH values are < 1 m2/g and < 0.01 cm3/g, respectively. The crushing strength of the composites becomes 10 daN from 1.0 daN. Carbonaceous material derived from tar is detected on the surface of the composite particle, as well as inside the particle, and the C content in the composite is 22 mass%-C. When the composites prepared are heated in He and 55%H2/He, the evolution of CO, CO2, and H2O begins at approximately 400 and 500 °C, respectively, and the formation profiles give a large peak at approximately 800−900 °C. The extent of reduction of the composites at 1000 °C is 85−95 %. The crushing strength of the dehydrated-LP decreases drastically up to a reduction extent of 50 %, whereas the strength of the composites is maintained at a reduction rate up to 50 %.
Keywords:
Carbon; Composite; Iron; Pellets;References:
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