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Abstract ▼ AI-Helper

Pine bark was carbonized by using a small-scale experimental kiln and three different types of large-scale kilns (simple (400-$500^{\circ}C$), improved (600-$700^{\circ}C$) and special kiln (800-$1,000^{\circ}C$). The physical properties and pore structures of the ba...

Pine bark was carbonized by using a small-scale experimental kiln and three different types of large-scale kilns (simple (400-$500^{\circ}C$), improved (600-$700^{\circ}C$) and special kiln (800-$1,000^{\circ}C$). The physical properties and pore structures of the bark charcoals prepared were analyzed. When the bark was carbonized at various temperatures ranging from 500 to $900^{\circ}C$in the presence of nitrogen, carbonization yield decreased rapidly with increasing carbonization temperature and it remained constant from 700 to $900^{\circ}C$. The carbonization yield of the bark was 16 - 18% higher than that of pine wood. The BET specific surface areas and iodine values increased with a decrease in carbonization yield. The BET specific surface areas of the bark charcoals reached about 400 -$500m^2／g$ for carbonization yield of 32-40%. The pine wood charcoal prepared at $600^{\circ}C$ for 30 min resulted in a more microporous structure, whereas the bark charcoal prepared at the same condition was more mesoporous. The carbonization yields and physical properties such as iodine values and BET specific surface areas of bark charcoals prepared by using the large-scale kilns were very similar to those of the small-scale kiln. The results indicated that the pine bark could be used as starting material to produce good quality charcoal having a large specific surface area and a high carbonization yield.

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