Reduction Rate and Crushing Strength of a Carbon-Containing Pellet Prepared by the Impregnation Method of COG Tar

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• 作者：Yuuki Mochizuki ; Megumi Nishio ; Naoto Tsubouchi ; Tomohiro Akiyama
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：March 17, 2016
• 年：2016
• 卷：30
• 期：3
• 页码：2102-2110
• 全文大小：409K
• ISSN：1520-5029

文摘

The crushing strength and reduction rate of a carbon-containing pellet (composite) prepared from a cold-bonded pellet (CP) and coke oven gas (COG) tar are examined. The peak of the pore size distribution profile, at approximately 2 nm, observed in the as-prepared CP decreases with the increase in the mixture ratio of tar to CP and completely disappears for the composites prepared above a mixture ratio of 1.0, and the S_BET and V_BJH values are <1 m²/g and <0.01 cm³/g, respectively. The crushing strength of the composites increases with the increase in the mixture ratio of tar to CP and becomes 10 daN from 1.0 daN, above a mixture ratio of 2.0. 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 are heated in He and 55%H₂/He, the evolution of CO, CO₂, and H₂O starts at approximately 400 and 500 °C, respectively, and the formation profiles indicate 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-CP decreases drastically up to a reduction extent of 50%, whereas the strength of the composites is maintained at a reduction rate up to 50% and then decreases with the increase in the reduction rate.