Production of carbon black from the waste tires pyrolysis

Waste tires have been valorized by pyrolysis using a pilot scale facility with a nominal capacity of 150 kWth. More than 500 kg of shredded waste tires were pyrolyzed at 550 degrees C using a continuous auger reactor. The char fraction produced, herein named pyrolytic carbon black (CBp) was characterized and submitted to different acidification/basification treatments in order to obtain similar properties to those of commercial carbon blacks. Elemental and proximate analyses, surface area and Hg porosimetry were used to investigate the properties of the CBp. It was observed that these treatments decreased the concentration of inorganic compounds without detriment of the textural properties. The ash content decreased from 14.9 wt% up to 3.0 wt.%, by using commercial and cheap reagents used in the chemical industry. The CBp was compared with those of commercial carbon blacks of the N300 series.