Swelling Behavior Of Biomass-Bonded Graphite Electrode Green Bodies During Baking
Keywords
Lignin, Collagen, Green, Composite, Puffing, Inhibition
Abstract
Biomass solid waste such as lignin and collagen have the potential to replace coal pitch binders in the preparation of carbon products. The control of their puffing behavior during high-temperature pyrolysis is a key factor affecting the physical and chemical properties of carbon products. For this reason, pine wood was used The lignin/collagen blend system was used as the binder, and the graphite electrode green body was prepared using hot pressing technology. The impact of the roasting process and puffing inhibitors on the puffing behavior during the roasting process was investigated, and through elemental analysis and scanning electron microscopy (SEM) ) for analysis. The results show that reducing the heating rate (0.04 ¡æ/min in the range below 500 ¡æ, 0.07 ¡æ/min in the range of 500~800 ¡æ), and appropriately increasing the cooling rate (1.08 ¡æ/min) is beneficial to inhibiting the roasting process. The generation of medium swelling behavior; Swelling inhibitors such as coconut shell charcoal, lignite, boric acid, ferric oxide and ferric chloride are difficult to apply to the swelling inhibition of biomass bonding systems. As the swelling inhibition effect increases, the appearance of carbonized electrodes The density shows a gradual attenuation trend; in the graphite electrode green system containing iron oxide, as the pyrolysis temperature increases, the C element continues to enrich, the mass fraction of N, O, and S elements continues to decrease, and the mass fraction of Fe element continues to decrease. It shows a fluctuating change. The pine wood lignin/collagen bonded coke gradually consolidates in the form of surface adhesion, internal filling or bridging, and finally forms a “graphite-like structure” coke. In the graphitization stage, the Fe element is deposited in the form of granular elemental iron. on the coke surface. 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 ¡æ/min to 500 ¡æ, then 0.07 ¡æ/min to 500-800 ¡æ) and a higher cooling rate (1.08 ¡æ/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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Original research was done by Zhao Zilong, Wang Hongjie, Dong Wenyi
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