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Vehicle recycling

Dismantling of vehicles for spare parts

  • 7 min read
  • 3 chapters

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Through Landfill, Catalytic converter and Steel

Approximately 12-15 million vehicles reach the end of their useful life each year in just the United States alone. These automobiles, although no longer roadworthy, can still have a purpose by giving back the metal and other recyclable materials that are contained in them. The vehicles are shredded and the metal content is recovered for recycling, while in many areas, the rest is further sorted by machine for recycling of additional materials such as glass and plastics. The remainder, known as automotive shredder residue, is put into a landfill.

The shredder residue that is not recovered for metal contains many other recyclable materials; 30% of it may be polymers, and 5-10% of it residual metals. Modern vehicle recycling attempts to be as cost-effective as possible in recycling those residual materials. Currently, 75% of the materials can be recycled, with the remaining 25% ending up in landfill. As the most recycled consumer product, end-of-life vehicles provide the steel industry with more than 14 million tons of steel per year.

Process

The process of recycling a vehicle is extremely complicated, as there are many parts to be recycled and many hazardous materials to remove. Briefly, the process begins with incoming vehicles being inventoried for parts. The wheels, tires, battery, and catalytic converter are removed. Fluids, such as engine coolant, oil, transmission fluid, air conditioning refrigerant, and gasoline, are drained and removed. Certain high value parts such as electronic modules, alternators, starter motors, infotainment systems - even complete engines or transmissions - may be removed if they are still serviceable and can be profitably sold in either "as-is" used condition or to a remanufacturer for restoration. The high value rare-earth magnets in electric car motors are also recyclable.

This process of removing higher value parts from the lower value vehicle body shell has traditionally been done by hand. As the process is labor intensive, it is often uneconomical to remove many of the parts. Self-serve junkyards address this in part by having customers remove parts from vehicles themselves. In this business model, cars often sit in a dedicated yard for anywhere from a few weeks to several months, and patrons can bring their own tools and remove any parts they want to buy. Once a vehicle has been in the yard for a sufficient period of time, the facility will proceed with the end-of-life vehicle scrapping and recycling process.

A technique that is on the rise is the mechanical removal of these higher value parts via machine based vehicle recycling systems (VRS). An excavator or materials handler equipped with a special attachment allows these materials to be removed quickly and efficiently. Increasing the amount of material that is recycled and increasing the value the vehicle dismantler receives from an end-of-life vehicle (ELV). Other hazardous materials such as mercury and sodium azide (the propellant used in air bags) may also be removed.

After all of the parts and products inside are removed, the remaining shell of the vehicle is sometimes subject to further processing, which includes removal of the air conditioner evaporator and heater core, and wiring harnesses. The remaining shell is then crushed flat, or cubed, to facilitate economical transportation in bulk to an industrial shredder or hammer mill, where the vehicles are further reduced to fist-sized chunks of metal. Glass, plastic and rubber are removed from the mix, and the metal is sold by multiple tons to steel mills for recycling.

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