CHARACTERISTIC AND APPLICATION OF PYROLYTIC CHAR DERIVED FROM PILOT SCALE PYROLYSIS OF SCRAP TYRES

Scrap tyres were pyrolyzed in a pilot-scale rotary kiln reactor in the temperature range of 450℃～650℃. The yield of pyrolytic char was about 39%～44%. Pyrolytic char contains relatively high content of ash (12%) and sulfur. The pore volume of pyrolytic char increased with pyrolysis temperature and reached the maximum at550℃. The maximum specific pore volume of char occurs at 50nm pore diameter. Medium surface area (253m2/g～306m2/g) activated carbons with relatively developed mecro- and macropores were obtained during activation of pyrolytic char in steam or CO_2. The pyrolytic char and activated carbon exhibit excellent adsorption capacity for methylene blue and Pb2+ from solution compared with commercial active carbon. The pyrolytic char can also be used as carbon black. The characteristics of carbon black and vulcanizate of pryolytic char, such as congeries structure, tensile strength, etc, are lower than those of N330 carbon black. Pryolytic char may use as low grade carbon black and find applications in low grade rubber goods.