- Introduction to pyrolysistechnology
The pyrolysis method to treat waste tires can realize the recovery of resources and the full reuse of valuable products. It is one of the important development directions of waste tire treatment in various countries.
In this technology, waste tires are firstly crushed into pieces and then sent to a pyrolysis reactor. After heating in the reactor, a thermal decomposition reaction occurs. Next, the gaseous products are passed into a condenser, whereby oil and gas are separated, and a fraction similar to diesel is condensed. The flammable gas is sent to the combustion furnace for combustion to provide a continuous heat source for the pyrolysis system. The solid product in the reactor is mainly carbon black. The crude carbon black is separated from the steel wire by magnetic separation, and the crude carbon black is further processed to obtain carbon black for commercial application.
- Characteristics of pyrolysisproducts
2.1 Pyrolysis oil
The viscosity is lower than that of fuel oil, similar to diesel oil. It can be directly injected as fuel oil without preheating procedure. The calorific value of pyrolysis oil is about 9800-10200 kcal/kg, which is higher than that of fuel oil.
The main usage of the pyrolysis oil:
The pyrolysis oil are mainly sold as fuel combustion. And it can be seen everywhere in boiler heating, cement plants, and steel plants.
Pyrolysis oil is also suitable for heavy oil generators. It can also be refined by refining equipment. After refining, it is called non-standard diesel oil. It can be used in diesel generators, heavy machinery, and can also be used as light fuel.
2.1 Carbon black
Different parts of a tire will be added with various carbon blacks due to different characteristics and requirements. Pyrolysis carbon black is the product of reduction and returning to the original carbon black, which is equivalent to a mixture of carbon blacks in various parts.
The production of pyrolysis carbon black requires rigorous and consistent pyrolysis control and a fine grinding process, so that in addition to a certain surface area and oil absorption value, pyrolysis carbon black also has low surface residual oil and low water sieve residue. When it is applied, in addition to obtaining consistent reinforcement stability, because of its low surface residual oil characteristics, it is different from ordinary recycled carbon black during high temperature mixing and processing, and does not produce strong odor.
The main usage of the carbon black
- Tire field
The value of carbon black is largely reflected in its reinforcing properties, because pyrolysis carbon black is recovered and reduced, its reinforcing properties cannot be compared with that of virgin carbon black, but through partial substitution and formula matching, it can still provide inexpensive carbon black products for tire customers.
- Application of rubber products
In rubber hoses, conveyor belts, conveyor belts, shock absorption products, rubber soles, sealing products and other rubber products.
- Application of plastic masterbatch
Because carbon black itself is light and easy to scatter, it is often made into color masterbatch for use in the plastics industry, which not only reduces pollution, but also improves the dispersibility of carbon black in plastics.
- Ink application
Taking the news ink with the most amount as the main entry point, the printing method is mainly offset ink (offset ink).
continue reading
