The tire recycling process comprises several distinct stages, designed to progressively reduce the size of the tires and separate their various material components. A complete tire recycling line typically yields three primary outputs: rubber powder, rubber granules, or steel wire. Each of these materials finds application across multiple industries, thereby creating value from materials that would otherwise be considered waste.
The initial operation involves a series of processing steps that transform the tires into rubber chunks approximately 3 to 8 centimeters in size. These chunks then pass through a steel bead separator to remove the steel bead wires embedded within the tire sidewalls, thereby preparing the material for the subsequent shredding stage. If not removed beforehand, these coarse steel wires-embedded deep within the tire structure-could damage the shredding equipment and cutting blades. The extracted steel constitutes valuable scrap metal that can be sold directly to steel recyclers. Steel that has undergone this bead removal process typically commands a higher market price, as its composition is known and it contains fewer contaminants.
Next, the rubber chunks are processed through a shredding system to produce rubber powder; depending on the specifications of the target product, this may involve a multi-stage grinding process. A screening system classifies the ground material by size; oversized particles are returned to the grinder for reprocessing, while particles meeting the size criteria proceed to the separation stage. This closed-loop system ensures consistent product quality and maximizes material utilization efficiency.
At this juncture, the rubber mixture still contains a significant quantity of fine steel filaments. Magnetic separation is employed to attract and remove these ferromagnetic materials-specifically the fine steel filaments-while allowing the rubber to pass through. The efficiency of this magnetic separation process depends on factors such as magnet strength, material flow rate, and particle size. Multiple stages of separation may be required to achieve a high recovery rate for the steel content. The clean steel recovered from this process holds potential for added value and, crucially, prevents contamination of the final rubber products.
The final processing stage involves classifying the rubber powder or granules according to size. Precise screening ensures that the particle size distribution aligns with client specifications. Common size classifications-typically ranging from 10–20 mesh, 20–30 mesh, to 30–40 mesh-are utilized for various rubber powder applications.
