Pyrolysis shredding

Whole tires have been pyrolyzed in an experimental semifluidized-bed reactor (27). The tires are pyrolyzed on a grate that tilts to discharge the steel belt and bead wire. The pyrolysis of whole tires eliminates shredding and grinding costs. 

Kutrieb Corporation (Chetek, Wisconsin) operates a pyrolator process for converting tires into oil, pyrolytic filler, gas, and steel. Nu-Tech (Bensenvike, Illinois) employs the Pyro-Matic resource recovery system for tire pyrolysis, which consists of a shredding operation, storage hopper, char-coUection chambers, furnace box with a 61-cm reactor chamber, material-feed conveyor, control-feed inlet, and oil collection system. It is rated to produce 272.5 L oil and 363 kg carbon black from 907 kg of shredded tires. TecSon Corporation (Janesville, Wisconsin) has a Pyro-Mass recovery system that pyroly2es chopped tire particles into char, oil, and gas. The system can process up to 1000 kg/h and produce 1.25 MW/h (16). 

Pyrolysis Energy in the form of gas or oil Shredding, magnetic separation Technology proven only in pilot applications even though pollution is minimized, air-quahty regulations possibly prohibiting use... 

The only raw material required for most tire pyrolysis processes is scrap tires. Some processors purchase and use whole tires, while others chip whole tires into two inch pieces, or purchase the tires already chipped. Conrad uses a local tire chipper to shred whole tires to a 2-inch size, wire-in, for their use. The tire chipper, who works on Conrad property, receives a tipping fee for collecting the tires, and provides the TDF to Conrad free of charge. 

Table 16.1 Pyrolysis processes for plastic wastes, auto shredded residues and tires along with other wastes... 

High-temperature pyrolysis (800°C) of the shredded waste conveyed by a screw feeder. Fixed-bed gasification of the char residue. Combustion of gas from pyrolysis and gasification units at 1250°C in a high temperature furnace... 

One important industrial application of vulcanized rubber pyrolysis is related to the processing of used tires (which are generated worldwide at a rate of over 5 million tons per year). The shredded scrap tires are commonly pyrolysed between 450 and 600" C, generating char (37-38 wt.%), oils (53-58 wt.%), and gases (4-9 wt.%) [14, 15]. The gases are composed mainly of H2, CH4, C4H6, CO, CO2. Other aliphatic hydrocarbons were also detected in gases. The oils contain a mixture of hydrocarbons, with DL-limonene as a main component (see Table 6.1.2). However, of special interest was the... 

The solid residues contain metallic substances which can be removed with ease from the soot after pyrolysis because they are the shredded steel components of tyres. 

Figure 5. Layout of the pyrolysis plant (1) tires stock yard (2) shredding plant (3) pyrolysis plant (4) central control room (5) carbon black plant (6) storehouse ...

In Figure 44 an overall mass balance based on production-scale illustrates the flow of the materials recovered in the process [61]. Important steps of the overall Recytec Process for battery recycling are as follows pyrolysis and gas treatment (condensation), shredding and washing, magnetic-inductive separation and electrolysis of the non-ferrous scrap and magnetic separation followed by the electrolysis of manganese dioxide and zinc. 

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