Effects of heat treatment and acid washing on properties and reactivity of charcoal
Effects of heat treatment and acid washing on properties and reactivity of charcoal
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DOI：
10.1016/j.biombioe.2016.03.041
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发表时间：
2016-07
影响因子：
6
通讯作者：
Asem Hussein;F. Larachi;D. Ziegler;H. Alamdari
中科院分区：
文献类型：
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作者：
Asem Hussein;F. Larachi;D. Ziegler;H. Alamdari
由于其高度无定形的碳结构和丰富的矿物质含量，除了其极高的空气和CO2反应性之外，收到的木炭还具有几个不期望的特性，例如低密度和电导率。这些缺点是使用这种材料作为阳极制造过程中石油焦的替代品的最具挑战性的障碍。在这项工作中，在惰性条件下的热处理被发现是一个有用的方法，以改善木炭的分子结构，在这个过程中，更有序的碳结构的连续生长的无定形形式的代价，使用XRD和拉曼光谱检测。因此，木炭的物理性质和反应性得到改善。此外，采用酸洗来去除木炭中的无机矿物质。结果表明，酸洗与热处理相结合，制得的活性炭活性较低，物理性能较好。预处理后的木炭样品的燃烧行为被认为是煅烧石油焦的燃烧行为。因此，在阳极配方中使用预处理的木炭来替代高达10%的焦炭没有显示出对阳极对空气和CO2的反应性的负面影响。
Due to its highly amorphous carbon structure and abundant minerals content, as received charcoal possesses several undesirable characteristics such as low density and electrical conductivity in addition to its extremely high air and CO2reactivities. These disadvantages are the most challenging obstacle for using this material as an alternative for petroleum coke in anode manufacturing processes. In this work, heat treatment under inert conditions was found to be a useful method to improve the molecular structure of charcoal, during this process continuous growth of the more ordered carbon structure at the expense of the amorphous forms was detected using XRD and Raman spectroscopy. Consequently, an improvement in the physical properties and the reactivity of charcoal occurred. In addition, acid washing was employed to eliminate the inorganic minerals of the charcoal. It was found that combination between acid washing and heat treatment produced charcoal having lower reactivity and better physical properties. The burning behavior of the pretreated charcoal samples was found to be comparable to that of calcined petroleum coke. Accordingly, using the pretreated charcoal to substitute up to 10% of coke in the anode recipe did not show a negative effect on the anode's reactivity to both air and CO2.