IPEC

All about tire recycling

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Source: IPEC

Modern civilization cannot live without rubber goods, and only waste rubber, in particular tires, we seem to be iniquity. Meanwhile, they can also be very useful to humanity as a source of energy.

The tire laid in a landfill (often bypassing environmental laws), is decomposed in a natural way more than 100 years. Contact of the tire with water (rainfall) leads to leaching of toxic organic compounds into the soil. Tires landfills literally add the heat of fires, which are so common in hot weather. It is not easy to extinguish such fires as the calorific value of the tire exceeds a solid fuel boiler.

There are two basic ways of rubber treatment: mechanical and thermal. The purpose of mechanical processes is rubber crumb or the product that does not differ dramatically from the feedstock in chemical properties.

The aim of thermal treatment technologies is the use of energy potential of rubber. By the standards of the US one tire is equivalent to 7 gallons of oil.

Mechanical methods of rubber processing into crumb are quite promising. They provide the product, which is widely demanded in the market, practically without any additional treatment.

However, electromechanical method has several disadvantages, the first of which is energy consumption. 1 m for grinding tires requires from 500 to 900 kW of power. Furthermore, the coefficient of net operating time is small, no more than 50-60% (in view of high equipment depreciation). A quick breakdown of the cutting equipment and the replacement of expensive knives (as required hardness of tool steel), together with low productivity results in very high cost of crumb rubber.

Thus, the interest in the rubber goods treatment increasingly focuses on the technology of thermal destruction or pyrolysis, releasing the energy potential of rubber.

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