Processed scrap metal

Scrap metal Scrap metal that is disposed of or recycled is a solid waste however, it is exempt from Subtitle C regulation when it is reclaimed (i.e., recycled to recover metal content). This does not apply to processed scrap metal that is excluded from hazardous waste regulation entirely. 

Scrap metal comprises worn or extra bits and pieces of metal parts, such as scrap piping and wire, or worn metal items, such as scrap automobile parts and radiators. If scrap metal is reclaimed, it is a solid waste and is subject to hazardous waste regulation. Scrap metal is also regulated as a solid waste when used in a manner constituting disposal burned for energy recovery, used to produce a fuel, or contained in fuels or accumulated speculatively. This does not apply to processed scrap metal, which is excluded from hazardous waste generation entirely. 

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. 

Excluded scrap metal includes processed scrap metal, unprocessed home scrap metal (steel mill scrap), and unprocessed prompt scrap metal (metal fabrication scrap) (40 CFR 261.1 (c)(9), (10), (11), and (12)). 

Excluded scrap metal includes processed scrap metal, unprocessed home... 

The primary sources of Al exposure for the human and their relative contributions to daily intake are shown in Table 3.1. Concurrent consumption of citrate enhances Al absorption and tissue distribution, and in people with renal function increases its elimination. Antacids and allergy immunotherapy can provide daily Al exposures of up to 5000 and 0.007-0.040 mg in adults, respectively (Yokel and McNamara 2001). Industrial Al exposure during Al ore mining and processing, scrap metal recovery, production and use of Al compounds... 

Secondary lead is primarily sourced from scrap lead-acid batteries but also processed scrap metallics such as sheet and pipe. Secondary operations are characterised by relatively small plants in comparison with primary smelters, and are sized to handle scrap availability within a local area. This is determined by the economics of scrap battery collection and transport to the secondary operation, and it follows that the largest secondary plants are located in the high vehicle density areas of the USA. 

Siemens s process A method of steel manufacture by addition of scrap metal, iron oxides and ferromanganese to molten pig (cast) iron. 

AHoy scrap containing tin is handled by secondary smelters as part of their production of primary metals and alloys lead refineries accept solder, tin drosses, babbitt, and type metal. This type of scrap is remelted, impurities such as iron, copper, antimony, and zinc are removed, and the scrap is returned to the market as binary or ternary alloy. The dross obtained by cleaning up the scrap metal is returned to the primary refining process. 

Alternatively, the TiCl may be reduced using hydrogen, sodium, or magnesium. It follows that TiCl2 is the first stage in the KroU process for the production of titanium metal from titanium tetrachloride. A process for recovery of scrap titanium involving the reaction of scrap metal with titanium tetrachloride at >800° C to form titanium dichloride, collected in a molten salt system, and followed by reaction of the dichloride with magnesium to produce pure titanium metal, has been patented (122,123). 

Indirect (French) Process. Ziac metal vapor for burning is produced ia several ways, one of which iavolves horizontal retorts. Siace all the vapor is burned ia a combustion chamber, the purity of the oxide depends on that of the ziac feed. Oxide of the highest purity requires special high grade ziac and less-pure products are made by blending ia Prime Western and even scrap ziac. 

Carburization by Menstruum Process. The P. M. McKenna method of caihuiization (1) involves the use of mineial concentrates such as wolframite [1332-08-7] Fe(Mn)WO, and microhte [12173-96-5] ferroalloys such as iron tungstide, FeW, or high purity scrap metals in a high... 

Recovery of copper metal and alloys from copper-bearing scrap metal and smelting residues requires preparation of the scrap (e.g., removal of insulation) prior to feeding into the primary process. Electric arc furnaces using scrap as feed are also common. 

Alt-malz, n. stored malt, -messing, n. old brass, -metall, n. old metal, scrap metal, -papier, n. old paper, used paper, waste paper, -rot-grundierung, /, (Dyeing) old red ground, -rotverfahren, n. old red process. Turkey-red dyeing, -schadenwasser, n. (Pharm.) yellow mercurial lotion. stoff, m. old material, waste. 

Schrott, tn. scrap (metal), esp. scrap iron, -martinieren, n., -rohelsenverfahren, n. (7ron) pig-and-ecrap process, -schmelze, /. (Metal.) scrap heat, -verfahren, n. (Iron) pig-and-ecrap process, -wert, tn. scrap value. Gchrubben, v.t. scrub, scour. 

Sperry turned his attention to the American Can Company s huge amount of scrap metal remaining after round can tops were pressed from square sheets. He and his colleagues refined American Can s electrolytic detmning process to deal with this scrap so that absolutely pure tin powder resulted. In 1907 and 1908, Speriy was involved m patent interference cases concerning this detiiiiiiiig process. The outcome was that... 

An overview is presented of plutonium process chemistry at Rocky Flats and of research in progress to improve plutonium processing operations or to develop new processes. Both pyrochemical and aqueous methods are used to process plutonium metal scrap, oxide, and other residues. The pyrochemical processes currently in production include electrorefining, fluorination, hydriding, molten salt extraction, calcination, and reduction operations. Aqueous processing and waste treatment methods involve nitric acid dissolution, ion exchange, solvent extraction, and precipitation techniques. 

Substantial quantities of aluminum, copper, and steel are reused as scrap. The challenge is to purify the scrap metal sufficiently to process it for reuse. There is opportunity for new processes that can remove unwanted elements—either alloyed or piece contaminants—more effectively and at lower cost than current processes. 

The degree of availability of recyclable resources such as scrap and wastes is a widely varying parameter. By way of illustration, scrap can be classified as new scrap (or in-process scrap) and old scrap (or post-consumer scrap). The former, which constitutes the majority of scrap processed at present, is derived mainly from the wastes generated during metal production and fabrication, and can be reclaimed and recycled with relative ease. 

As the assembled molds are being placed on the pour-off lines, the scrap metal is melted in the furnace. Molten metal from the furnace is brought to the molds on the pouring lines in a refractory lined pouring ladle. Once poured, the molds are allowed to cool before being sent to the shakeout processes. At the shakeout, the castings are separated from the sand mold. The sand is sent to a reclamation system so that it can be reused in the molding process. 

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 first step of the process is performed in a separate, dedicated building. The drums of arsenic trioxide are opened in an air-evacuated chamber and automatically dumped into 50% caustic soda. A dust collection system is used. The drums are carefully washed with water, the washwater is added to the reaction mixture, and the dmms are crushed and sold as scrap metal. The intermediate sodium arsenite is obtained as a 25% solution and is stored in large tanks prior to further reaction. In the next step, the 25% sodium arsenite is treated with methyl chloride to produce the disodium salt DSMA (disodium methanearsenate, hexahydrate). This DSMA can be sold as a herbicide however, it is more generally converted to MSMA, which has more favorable application properties [8]. 

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