Recycling secondary

Breakdown of Typical Domestic Wastes in the United States around 1990 

There are other short-term outlets for plastics use in medicine, transportation, toys, etc. A breakdown of plastics use in various utilities in the United 

States in 1990 is shown in Table 7-4. Other countries use more plastics in agriculture. 

However, thermal reprocessing of post-consumer waste plastics introduces changes into the materials that mean they may be unusable for the applications for which they were originally intended, even if the same synthetic polymer type is reprocessed. These changes are partly due to the differences in the formulation of plastics in different applications, and partly due to chemical and physical changes that occur during the thermal reprocessing of the material. 

The formulation differences arise to meet the design needs of the specific application, and the properties of the material can be modified by, among other things  

The thermal reprocessing of post-consumer waste has to address the ways that materials which vary considerably in their chemical composition may react themselves and interact, physically and chemically with polymers from other applications. 

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Secondary ozonide Secondary plasticizer Secondary recycling Secondary structures Secosteroid... 

In 1996, the U S. domestic lead industry was comprised of 17 mines located primarily in Alaska, Colorado, Idaho, Missouri, and Montana two primary smelter-refineries in Missouri a primary smelter in Montana and 25 secondary (recycling) producers operating 31 plants. Of the lead recycled in 1996, 99% was produced by 10 companies operating 17 plants in Alabama, California, Florida, Georgia, Indiana, Louisiana, Minnesota, Missouri, New York, Pennsylvania, Tennessee, and Texas. Lead is also sold by the Defense National Stockpile Center (DNSC) as a result of legislation passed in 1992 authorizing the disposal of the entire 545,000 metric tons in the stockpile over several years. The law, however, requires the task to be completed without undue disruption of commercial lead markets (Larrabee 1997 Smith 1998). 

Secondary radiations, 21 312-313 Secondary recycling, 21 378-379, 449, 450 Secondary refrigerants, 21 525 Secondary slags, electric furnace for, 14 759-760... 

The sedimentary and metamorphic rocks uplifted onto land have become part of continents or oceanic islands. These rocks are now subject to chemical weathering. The dissolved and particulate weathering products are transported back to the ocean by river runoff. Once in the ocean, the weathering products are available for removal back into a marine sedimentary reservoir. At present, most mass flows on this planet involve transport of the secondary (recycled) materials rather than the chemical reworking of the primary (juvenile) minerals and gases. The natirre of these transport and sediment formation processes has been covered in Chapters 14 through 19 from the perspective of the secondary minerals formed. We now reconsider these processes from the perspective of impacts on elemental segregation between the reservoirs of the crustal-ocean-atmosphere factory and the mantle. 

Some Bright Spots PET Bottles Reprocessing PET and Other Polymers Secondary Recycling Not Everything Is Easily Recycled Back to Basics Tertiary Recycling Recycling by Thermal Decomposition Practical Recycling... 

Secondary recycling, 191,193,194-195 Secondary valence forces, 58 Self-assembly, 216-218 Semicrystalline polymers, 138,140, 154 Sensors for smart materials, 207, 208, 218 Sequence distribution, 28 Serine, 29... 

Some Bright Spots PET Bottles Reprocessing PET and Other Polymers Secondary Recycling... 

In this chapter the technical as well as legislative aspects of mechanical (secondary) recycling of post-consumer plastics will be described. For packaging materials containing a certain amount of PCR plastics the most important point is the migration of the suspicious compounds from the polymer. 

Classes 2 and 3 correspond to US FDA s category Physical reprocessing Secondary Recycling . Class 4 corresponds to US FDA s category Chemical Reprocessing Tertiary Recycling . 

Miscellaneous materials Primary recycling Secondary recycling... 

Heterogeneous process mainly involves chemolysis/solvolysis, and it uses chemical reagents or solvents for depolymerization of the polymer into monomers. It is a secondary recycling technique depending on the nature of polymers, a wide variety of solvents are used for the depolymerization process. Based on the nature of solvents, it is named as alcoholysis, methanolysis, glycolysis, etc. 

The main driving force for this development is the overall process improvement to be gained by removing many internal secondary recycle streams, thereby freeing the QSL smelter for primary lead smelting activities. This smelter is the third Ausmelt technology smelter installed at Korea Zinc s Onsan complex and will commence operations in the second half of... 

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