Study On The Fragmentation Of Waste Tire By Cold Quenching After Low Temperature Pyrolysis

Transportation development has brought people great convenience in daily life, on other hand, also resulted in large quantities of waste tires. The waste tire not only occupied land, but also seriously pollute environment. With the strengthening of people's environmental awareness and the shortage of the world's oil and other fossil energy sources, for the reduction, hazard-free treatment and reclamation of waste tire, nowadays how to efficiently recycle and reuse the short-supplied resource (such as rubber, carbon black, steel, etc) in waste tire is one big difficult problems of world solid waste treatment.Nowadays, waste tire treatment approaches can be roughly divided into three categories, the prototype restructuring, renewable use and thermal-chemical disposal. Thermo-chemical disposal can be divided into two ways: first one is direct combustion; second one pyrolysis. This article aimed at solving the difficulty of breaking waste tire, considering using the waste tire, after low temperature pyrolysis followed cold quenching, as the material in the preparation of coke. This article mainly focused on the following three aspects: (1) thermal analysis of waste tire; (2) design of the fixed bed reactor and small scale experimental study of the low temperature pyrolysis & cold quenching of waste tire; (3) investigation of the mechanics properties of the treated materials.Differential thermal analysis (DTA) showed that there are two decomposition apexes for the waste tire, one apex temperature is 400℃and another one is 650℃. Thermogravimetric (TG) experimental results indicated that waste tire start slow weight loss at about 200℃, weight loss is about 8% at 350℃, whereas for 400℃weight loss is about14%, after 400℃waste tire weight will reduce quickly. A series of pyrolysis & cold quenching experiments under different conditions showed that solid recovery of waste tire significantly decreased with the increase of pyrolysis temperature. At the same time, the investigation of mechanics properties showed the compressive strength, the curved intensity and the impact toughness of treated waste tire reduced with temperature increase. If the pyrolysis temperature was 350℃, the compressive strength, the bending strength and the impact toughness are 0.59MPa, 0.51MPa and 0.015J/mm2, respectively.In this paper, the scrap tire pyrolysis & cold quenching treatment technology will provide a new way for waste tires resources. The optimum treatment conditions are: rapid temperature rise rate, pyrolysis temperature of 350℃and cold water quenching, the solid recovery about 80%, the optimum method for the breakage of the treated waste tires is the crushing method.