Removing Peculiar Smell And Deashing Study Of Pyrolytic Char From Pyrolysis Of Scrap Tires

With the rapid development of automobile industry, more and more srcap tires are generated. Compared to other srcap tires teading methods, pyrolysis is more in line with the resource, harmless and reduction principles of waste disposal. Pyrolytic char is one of the most important products of tire pyrolysis.The pyrolysis process economy depends strongly on its quality and commercial value.The existence of ash, high volatile content and strong peculiar smell of pyrolytic char restrict the scope of its application.Under this background, the characters of pyrolytic char are determined according to GB 3778-2003 at first. In the study of removing peculiar smell, the result that peculiar smell is removed when its volatile content whin the scope of 13.15-15.24% is finded.The volatile content decreases with the heating time and heating temperature increasing under the conditions of no protective atmosphere.The better results are 400℃,45min,450℃,30min and 500℃,15min.In the atmosphere of N2 and CO2, the volatile content decreases with heating time and heating temperature increasing, decreases first and then increases with gas flow increasing.The better results are 300℃,10min,18L/h and 300℃,15min,12L/h.In the study of deashing, the pyrolytic char is acid-washed in order to get rid of or reduce ash content.The ash content decreases with acid concentration, acid washing time, liquid-solid ratio and stirring speed increasing, with volatile content decreasing.The ash content decreases first and then increases with washing temperature increasing. The optimal conditions of acid washing are:2mol/L,30min,80℃,8ml/g and 200r/min, the ash content decreases from 14.50% to 7.19%. Acid washing with hydrochloric acid and nitric acid in order, the ash content can decrease to 6.61%.