RECOVERING RECYCLABLE MATERIALS FROM SHREDDER RESIDUE

Each year, about 11 million tons of metals are recovered in the United States from about 10 million discarded automobiles. The recovered met als account for about 75 percent of the total weight of the discarded vehicles. The balance of the material, known as shredder residue, amou nts to about three million tons annually and is currently landfilled. The residue contains a diversity of potentially recyclable materials, including polyurethane foams, iron oxides, and certain thermoplastics. This article discusses a process under development at Argonne Nationa l Laboratory to separate and recover the recyclable materials from thi s waste stream. The process consists essentially of two stages. First, a physical separation is used to recover the foams and the metal oxid es, followed by a chemical process to extract certain thermoplastics. The status of the technology and the process economics are reviewed he re.