| 引用本文: | 赵子龙,王宏杰,董文艺.生物质黏结基石墨电极生坯焙烧过程中的膨化行为[J].哈尔滨工业大学学报,2018,50(2):104.DOI:10.11918/j.issn.0367-6234.201608016 |
| ZHAO Zilong,WANG Hongjie,DONG Wenyi.Puffing behavior during the carbonization of lignin-collagen based green composites[J].Journal of Harbin Institute of Technology,2018,50(2):104.DOI:10.11918/j.issn.0367-6234.201608016 |
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| 摘要: |
| 生物质固体废弃物如木质素、胶原蛋白具有替代煤沥青黏结剂制备碳素制品的潜力, 高温热解过程中其膨化行为的控制是影响碳素制品理化性能的关键因素.为此, 以松木木质素/胶原蛋白共混体系为黏结剂, 采用热压技术制备石墨电极生坯, 重点考察焙烧工艺及膨化抑制剂对其焙烧过程中膨化行为的影响, 并通过元素分析及扫描电子显微镜(SEM)进行分析.结果表明：降低加热速率(低于500 ℃范围内0.04 ℃/min, 500~800 ℃范围内0.07 ℃/min), 并适当提高冷却速率(1.08 ℃/min)有利于抑制焙烧过程中膨化行为的产生; 椰壳炭、褐煤、硼酸、三氧化二铁和氯化铁等膨化抑制剂难以适用于生物质黏结体系的膨化抑制, 随着膨化抑制作用的加强, 碳化电极的表观密度呈逐渐衰减趋势; 在含有三氧化二铁的石墨电极生坯体系中, 随着热解温度的升高, C元素不断富集, N、O、S元素质量分数不断减少, Fe元素质量分数则呈波动性变化, 松木木质素/胶原蛋白黏结焦逐渐以表面黏附、内部填充或桥接等形式固结, 并最终形成“类石墨结构”焦炭, 石墨化阶段Fe元素以颗粒状单质铁形式沉积在焦炭表面.
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| 关键词: 木质素 胶原蛋白 石墨电极生坯 膨化 抑制 |
| DOI：10.11918/j.issn.0367-6234.201608016 |
| 分类号:X71 |
| 文献标识码:A |
| 基金项目: |
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| Puffing behavior during the carbonization of lignin-collagen based green composites |
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ZHAO Zilong1,2,WANG Hongjie1,2,DONG Wenyi1,2
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(1.Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, Guangdong,China; 2. Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control (Harbin Institute of Technology Shenzhen Graduate School), Shenzhen 518055, Guangdong,China)
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| Abstract: |
| Biomass solid wastes, such as lignin and collagen, are potentialized to be developed as coal tar pitch alternatives to prepare the carbon products. However, controlling the puffing behavior during the carbonization is a key factor to obtain the excellent carbon materials. In the present study, green composites using the pine softwood lignin and collagen as hybrid binder were prepared by the hot-pressing process. The effect of baking program and puffing inhibitors on the puffing behavior was evaluated. Elemental analysis and Scanning Electronic Microscopy (SEM) were also employed for further study. Results showed that a lower heating rate (baking rate of 0.04 ℃/min to 500 ℃, then 0.07 ℃/min to 500-800 ℃) and a higher cooling rate (1.08 ℃/min) were preferred for puffing inhibition. Some traditional puffing inhibitors, such as coconut shell, lignite coal feed, boric acid, ferric oxide, and iron (Ⅲ) chloride, were not available to the bio-binder system. Along with the improvement of puffing inhibition, the apparent density of the baked product gradually decreased. In the case of a mixture system containing ferric oxide, the rising temperature promoted the enrichment of carbon element and the decrease of other elements such as N, S, and O, resulting in fluctuating change in Fe content. The lignin/collagen hybrid system served as thermally-fused binder to form a new integrated char with turbostratic structure by means of covering, filling and bridging, and iron precipitates derived from ferric oxide was observed on the surface of char during the graphitization.
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| Key words: lignin collagen green composite puffing inhibition |
