Recycle Scrap

General purpose Rigid moldings. Trays, boats, tanks, boxes, luggage, seating. 

Flexible resins and Tough, good impact resist- Vibration damping ma- 

Light-stable and Resistant to weather and Structural panels, sky- 

Chemical-resistant Highest chemical resistance Corrosion-resistant appli- 

Flame-resistant Self-extinguishing, rigid. Building panels (interior), electrical components, fuel tanks. 

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As a stmctural element to support paneling and wall mounts, there is growing iaterest ia the use of plastic lumber produced usiag the recycled scrap or waste of polyethyleae (HDPE), polypropyleae, and PET materials from various packagiag and other high turnover appHcations (12,17,18,21,23,24,32,34,44,62,68-71). 

Processed scrap metal. Scrap metal includes, but is not limited to, pipes, containers, equipment, wire, and other metal items that are no longer of use. To facilitate recycling, scrap metal that has been processed to make it easier to handle or transport and is sent for metals recovery is excluded from the definition of solid waste. Unprocessed scrap metal is still eligible for an exemption from hazardous waste regulation when recycled. 

Shredded circuit boards. Circuit boards are metal boards that hold computer chips, thermostats, batteries, and other electronic components. Circuit boards can be found in computers, televisions, radios, and other electronic equipment. When this equipment is thrown away, these boards can be removed and recycled. Whole circuit boards meet the definition of scrap metal, and are therefore exempt from hazardous waste regulation when recycled. On the other hand, some recycling processes involve shredding the board. Such shredded boards do not meet the exclusion for recycled scrap metal. In order to facilitate the recycling of such materials, U.S. EPA excluded recycled shredded circuit boards from the definition of solid waste, provided that they are stored in containers sufficient to prevent release to the environment, and are free of potentially dangerous components, such as mercury switches, mercury relays, nickel-cadmium batteries, and lithium batteries. 

The objectives for disposal of electronic waste appliances are (a) stripping of hazardous substances (b) reduction of pollutant and metal contents in the plastic fraction, thus permitting recycling or incineration in waste incineration plants or cement works (c) recovery of nonferrous metals and (d) attainment of commercially recyclable scrap quality. 

Most lead used by industry comes from mined ores ("primary") or from recycled scrap metal or batteries ("secondary"). Human activities (such as the former use of "leaded" gasoline) have spread lead and substances that contain lead to all parts of the environment. For example, lead is in air, drinking water, rivers, lakes, oceans, dust, and soil. Lead is also in plants and animals that people may eat. See Chapter 3 for more information on the physical and chemical properties of lead. Chapter 4 contains more information on the production and use of lead. 

A large fraction of the iron and steel produced today is recycled scrap. Since scrap does not require reduction, it can be melted down directly in an electric arc furnace, in which the charge is heated through its own electrical resistance to arcs struck from graphite electrodes above it. The main problem with this process is the presence of tramps (i.e., copper from electrical wiring, chromium, nickel, and various other metals) that accompany scrap steel such as crushed automobile bodies and that lead to brittleness in the product. Tin in combination with sulfur is the most troublesome tramp. Only the highest quality recycled steel—specifically, steel with no more than 0.13% tramps—can be used for new automobile bodies, and usually reprocessed scrap has to be mixed with new steel to meet these requirements. 

Stallings, TATB PBX Formulation (Recycling Scrap PBX) , MHSMP-77-18F, Mason Hang-... 

Recycling scrap tires into useful products such as floor mats, sandal soles, and fish barriers, have very limited demand and at best could assemble only a small fraction of the available scrap tires. 

USA (primarily Arizona, New Mexico, and Utah), 20% the former Soviet Union, 9% Canada, 8% China 8% andZambia, 5%. Presently, recycled scrap metal, or secondary copper, contribntes an additional 25 35% to this yearly output. Open-pit strip mining yields most of the copper ore, which is typically 0.4-1% in copper. Underground methods are used for deeper, vein-type deposits that have a significantly higher copper content (needed to offset the increased mining costs). 

Many hydrometallurgical processes or process steps are used to upgrade concentrates, process recycled scrap metal, or purify aqueous process steams. Examples are (I) the leaching of molybdenite concentrate to remove Knpurities ,ft (2) leaching of tungsten carbide and molybdenum scrap-, (3) removal of copper impurities in nickel anolyte by cementation on metallic ruckel and (4) various methods for treating nuclear fuel elements. 

Raw material used Wool synthetic fibers, chemicals for treating Iron ore, limestone, recycled scrap Inorganic and organic chemicals Chemical substances, e.g., solvents and acids ... 

Another 3x10 tonnes of lead are produced from secondary sources each year, by recycling scrap lead products such as sheet, pipe and batteries. Today, in the western world, more lead is produced by recycling than by mining. More than 50% of the lead consumed in the US is in the form of batteries, and of this about 90% is reclaimed. At present, battery scrap is converted to impure lead or lead alloys by pyro-metallurgical processes employing blast, reverberatory, or rotary furnaces. The overall recovery of the metallic components of scrap in plants having both reverberatory and blast furnaces is > 95%. 

According to Reference [60], a sheet extruder has found a way to lower costs by compounding crumb rubber from recycled scrap tires into PE or PP, using a patented technology. 

Myhre M.J. 2004. Compounding with recycled scrap rubber. 166th Rubber Division... 

Myhre M.J. 2005. Compounding with recycled scrap mbber. Rubber World. 231 26-9. 

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