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Metals produced via the ore mining, smelting and refining process, are referred to as primary metals. Scrap metals or secondary metals are derived either from industrial operations, such as the smelting or metal recycling Houston centers , and from the manufacture of metal shapes and products, or as post-consumer metal products collected from the waste stream. The industrial operations scrap metal is a purer form of the metal since it comes directly from the manufacturing industry. It is usually of known quality and composition and often uncoated and is therefore readily recycled back into the metal-production process. However, the scrap metal collected as post-consumer scrap is made up of discarded, used, or worn-out products and, as such, usually contain residues of other contaminant components. Whether or not metal scrap is recovered is generally determined by the economics of the collection and processing system, in particular, the purity of the recovered products, the market for the recycled products, and the monetary value of the metal. In addition, the costs of collection and transport, sorting and transformation into re-usable metal and the cost of disposing of any residual material, also have to be considered. Metals have the advantage over other recyclable materials, in that the characteristics of the metal are not changed by the recycling process and metals can be recycled over and over again. The ferrous scrap derived from the recycling of iron and steel comes mainly in the form of bulky waste such as scrapped vehicles and kitchen goods such as washing machines, cookers, fridges, etc. These items are collected by scrap metal merchants and sorted into various types and grades of scrap metal, for transfer up the waste metal infrastructure to the metal refiners. The bulky scrap items are broken down by fragmentizes which fragment the waste metal in a hammer mill and are then sorted by air classifiers to produce a metal-rich stream and a residual stream containing plastics, wood, fabric, etc., which is eventually land filled. The scrap ferrous metal is recycled in steelworks using either the basic oxygen furnace or an electric arc scrap re-melting furnace. Up to 25% scrap may be incorporated into the basic oxygen process and up to 100% in the electric arc process. The aluminum recycling Houston center collected from scrap metal merchants is shredded and separated from other metals, using magnetic separators to remove ferrous metals, and sink-and-float methods to separate the aluminum from other non- ferrous metals by density. Further processing may include, for example, the removal of the lacquer from aluminum drinks cans prior to re-melting. The major user of aluminum alloys from secondary smelters is the automotive industry, followed by the engineering and building industries. There are various process are involved in recycling different types of metals in the houston recycling center. Reading the reviews provided by the author is one of the best ways to gain necessary information on http://www.scrapmetalshouston.com/contact/.
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