Advanced recycling processes help return shredded plastic scrap into regenerated plastics with properties nearly equaling those of the original material. Consider the mix of materials that go into household appliances and automobiles. The good news, say researchers at (Argonne), is that over 95% of the over 50 million vehicles scrapped globally each year enter a comprehensive recycling infrastructure. Nearly 75% of the weight of the vehicles is metals and the metals are profitably recycled through direct reuse, component remanufacturing, and scrap processing or shredding. Other components such as batteries, automotive fluids, some windshield glass, starters, alternators, and other dismantled parts are also recycled. The percentage of recycled materials from vehicles is about to go up. Argonne, working with the Vehicle Recycling Partnership (VRP) of the United States Council for Automotive Research (USCAR), a partnership between General Motors, Ford Motor Co. , and the American Chemistry Council-Plastics Div. (ACC-PD), is developing technology for recycling polymeric materials from shredder residue. Scrap processors use giant 3,000 to 8,000-hp hammer mills to shred both vehicles and other obsolete metal-containing products. Household appliances, industrial scrap, and demolition debris are all candidates for being turned into fist-sized chunks as a means of liberating the metals. Processing-unit operations vary but the basic process involves air classification of the “lights” fraction followed by one or more stages of magnetic separation to recover the ferrous metals. Trommels and screens are then used to remove particles smaller than about 5/8 in., followed by one or more stages of eddy-current separations to recover the nonferrous metals. Once the metals are gone, what’s left is called shredder residue. It’s typically a mix of polymers (plastics, rubber, and polyurethane foam), a “fines” fraction that includes metal oxides, glass, and dirt, as well as residual amounts of ferrous and nonferrous metals. For each ton of
Products & Services
Wheel Dressers and Dressing Tools
Wheel dressers and dressing tools are used to condition, true and dress grinding wheels. Dressing is the process of re-sharpening the tiny cutting edges on a grinding wheel’s surface.
Metal Powders (Powdered Metals)
Metal powders are finely divided or powdered metals used in fabricating sintered parts, thermal spraying, filling plastics, and other specialized applications.
The Vecoplan VAZ 2000 RM Re-Shredder is used to re-shred a wide range of low-density, pre-shredded waste materials and achieve a high degree of particle consistency for re-processing, separation and...
Topics of Interest
7.1 Iron and Steel
Steel dominates in tonnage, relatively cheap per ton, but is still by far the largest in gross value. It is used mainly in the construction, machinery and automobile industry...
Susan E.Selke, Ph.D.
School of Packaging
Michigan State University
East Lansing, Michigan
The amount of plastics being recycled continues to increase around the...
Recycling of metals from secondary sources is a growing industry. There are a large number of secondary sources, collectively called "scrap", which is defined in the dictionary as...
In Chapter 1, chemical recycling and energy recovery were introduced as alternatives to mechanical recycling. We have seen how plastics can be reprocessed if they are pure streams, if they...
Plastic production accounts for about 4% of total oil consumption. Whilst this is not a vast percentage, it still represents a significant potential energy resource saving if plastics can...