Tire Recycling Process
Shredding the rubber
The machinery used to crush rubber tyres is quite complex and expensive. The most commonly used machine is the tire shredder, which has two counter-rotating shafts and operates at low speeds of 20-40 RPM and high torque.
The tires were pre-torn into strips. Some operators like to first split the tire into three sections, separating the steel strip from the tread. This is done to remove the 1-inch-thick steel balls from the tire. Removing steel balls can reduce wear on shredders, granulators, and other machines. Finally, the parts are shredded into large pieces.
Removal of the steel and textile fibres
Magnets are used to remove the smaller steel fibers from the material as it is shredded into smaller sizes in a granulator. In another stage, polyester fibers are removed using a combination of vibrating screen, air screen and low vacuum suction. Steel and textile fibres make up at least 30 per cent of tyres. The residual rubber particles are crushed into coarse powder (0.6-4.0) mm, which can be used in different fields.
Cryogenic Grinding technology
The same process can be done by placing the tyre at a low temperature. This process is called “cryogenic” because the temperature here can be as low as -80C to 120C. The pellets, or entire tires, are cooled to -120C, making them glassy and brittle. In special grinders, it is pulverized or ground to fine sizes of 50-250 microns. This process requires less energy and machinery than conventional “room temperature” processes. Using this process also makes it easier to release steel and fiber from the rubber, making our products cleaner.
One drawback of the system is the additional cost of using liquid nitrogen as coolant. The high quality rubber products thus formed are used in a variety of industrial and chemical processes to produce compounds and caustics.
Pyrolysis is a thermochemical process that uses high temperatures to break down organic material in the absence of oxygen. Tyre pyrolysis is a method of tire recovery, the residual product of which is a fuel oil that can be used in industries such as steel, iron and boiler plants, ceramics, electric power, chemical industry and hotels, as well as in generators to generate electricity.
The entire tire is put into a reactor and sealed. The reactor rotates slowly. Reactors are heated slowly from coal, charcoal, fuel, gas, wood, etc. As the rubber softens, the rubber polymer breaks down into smaller molecules that eventually vaporize and leave the reactor. The oil and gas from the reactor then enters the condensing system as liquid oil. Residual gases that have not been liquefied are guided back into the combustion system. It is used as fuel to heat the same reactor, thus saving energy.
The smoke created in this process can be filtered and treated to remove all contaminants and then released into the atmosphere. Therefore, tire pyrolysis is considered as an environmentally friendly way to recycle tires.
When oil production is complete, the reactor temperature returns to normal. The residue of this process is carbon black and steel wire. Black carbon is used in construction and as a low grade fuel. Recycling or recovered carbon black is treated to become a high-value product used as a filler in the rubber industry, paints and coatings, ink production and other industrial applications. The wire is recycled and used to make new steel products.
Tire waste recycling is the process of remanufacturing used or waste tires into new valuable materials. We are trustable manufacturer of high quality waste tire recycling machines with comparative price considerate after-sale service.