Recycling of scrap tyres
An innovative technological application which capitalises on and makes maximum use of scrap tyres by obtaining electrical energy and coal for industrial use.
The technology for total recycling of scrap tyres is based on the following three processes:
- Thermal decomposition of scrap tyres by means of pyrolysis and gasification
- Use of the decomposed gasses by means of cogeneration cycles
- Purification of black pyrolytic waste
The development of this technology allows the complete recovery of scrap tyres, adding value to each of its components without producing any effluents or emissions.
The valuation of the components of scrap tyres is the following (based on strict compliance with European standards regarding environmental directives concerning waste disposal):
- During the initial phase steel is obtained, which can be sold
- During the solid phase a purification process is applied to obtain carbon black
- During the gaseous phase a non-condensable gas is generated that can be used as an energy source for the burners during the reaction phase. This gas has a low/average calorific value (3.710 Kcal/Nm3), with a low methane content (<20%) and a hydrogen content smaller than 10%
- During the liquid phase hydrocarbons are obtained which can be used as fuel for turbines in order to create electrical energy.
Taking a standard cartyre as a reference in its decomposition our process will obtain:
- Carbon black: 36%
- Liquid Hydrocarbons: 35%.
- Non-condensable gasses: 15%.
- Steel: 14%.
The electric energy can be sold. The value of the carbon black will substitute the fossil carbon, avoiding CO2 quota, while the by-products obtained in the process (steel and bitumen emulsions) can be sold.