In the search for solutions to the waste tire problem, people have tried a variety of tyre recycling methods. Each scrap tyre recycling solution works to a certain extent, but each has its own limitations.
Retreading Waste Tyre
Retreading is a common way of utilization, which is mainly for tires with less wear. Through a series of professional processing processes, such as grinding, repairing, and vulcanization, these tires can be reborn and put back into use. Retreading scrap tyre recycling solution can not only extend the service life of tires, but also effectively reduce the production demand for new tires. It can reduce resource consumption and production costs.
However, not all waste tires are suitable for retreading, and their scope of application is relatively limited. Moreover, the retreading tyre recycling solution process has extremely high requirements for technology and quality control. If the retreading process is not up to standard, it is easy to bury safety hazards. Dangerous situations such as tire blowouts may occur during use, seriously threatening the life safety of users.
Waste Tyre Mechanical Recycling
Making waste tires into rubber particles or rubber powder is also a widely used tyre recycling solution. It uses cutting and crushing machines to process waste tires into rubber particles or rubber powder of different particle sizes. These rubber particles and rubber powder are widely used and can be used to produce rubber tracks, rubber floor tiles, waterproof materials, etc.
However, due to the complex composition of waste tires, which contain a variety of additives and impurities. This will lead to unstable quality of the rubber particles or rubber powder produced, which in turn affects the quality and performance of related products. Moreover, during the waste tire mechanical recycling, certain pollution (dust pollution) will be generated. This is harmful to the environment and workers’ health.
Heat Recovery
Heat recovery is also one of the important scrap tyre recycling solutions. Waste tires have a high calorific value, which is 69%/kg higher than wood, 10%/kg higher than bituminous coal, and 4%/kg higher than coke. This makes it possible to use it as fuel for industrial boilers or power generation. In some factories, waste tires are crushed and mixed with other combustible wastes in a certain proportion to make solid waste fuel (RDF). This not only achieves energy recycling, but also reduces dependence on fossil fuels.
However, this heat recovery scrap tyre recycling solution also has obvious disadvantages. During the combustion process, waste tires will release a large amount of harmful gases, such as sulfur dioxide, nitrogen oxides, dioxins, etc. If these gases are directly discharged into the atmosphere without effective treatment, they will cause serious pollution to the environment, such as acid rain and haze.
Pyrolysis Scrap Tyre Recycling Solution
Pyrolysis plant, as an advanced solid waste treatment equipment, has created a new Scrap Tyre Recycling Solution. Its principle is to heat waste tires to high temperatures in a specific environment without oxygen or with low oxygen, so that the organic polymer compounds inside them undergo cracking reactions. In this process, the macromolecular chains break and the chemical bonds recombine, thereby converting into small molecular pyrolysis oil, synthesis gas, carbon black and steel wire.
The magic of tyre pyrolysis plant lies not only in its ability to decompose waste tires, but also in the fact that the tire pyrolysis products have extremely high economic value. Mingjie Group provides a unique flue gas treatment system for tire recycling pyrolysis plant, which can make the exhaust gas generated during the tire pyrolysis process meet the emission standards.
The pyrolysis oil produced by waste tire pyrolysis is used as industrial boiler fuel and refined into diesel by pyrolysis oil distillation plant. Carbon black is used in tire recycling, inks, and coatings. Steel wire is used as a metallurgical raw material (with a recovery rate of up to 99%). Combustible gas provides self-sustaining energy for the pyrolysis system.
Waste tire pyrolysis recycling plants can achieve nearly 100% resource utilization, but the investment cost is high. Using pyrolysis to process scrap tires at scrap tyre recycling plant requires significant capital investment. This includes the initial investment in a fully continuous pyrolysis plant and the high operating costs associated with energy consumption.
