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David J. Gingery (/ ˈ ɡ ɪ ŋ ɡ ər i /; December 19, 1932 – May 3, 2004) was an American inventor, writer, and machinist, best known for his series of books on how to build machine tools.
Metal scrap recycling, also called secondary metal processing, is a large industry that processes, in the U.S. alone, 56 million tons of scrap iron and steel (including 10 million tons of scrap automobiles), 1.5 million tons of scrap copper, 2.5 million tons of scrap aluminum, 1.3 million tons of scrap lead, 300,000 tons of scrap zinc and ...
Copper anodes (98% Cu purity) emerged from the furnace as an intermediate product. For a number of years, these were electrolyzed by Chemetco to produce a higher-purity copper cathode (99.98% Cu purity.) However, the company later discontinued electrolysis of its own copper and sold copper anodes, each weighing 740 lb (340 kg) to Asarco.
Pressing steel – Domestic scrap metal up to approx. 6 mm (0.24 in) thick. Examples – "White goods" (fridges, washing machines, etc.), roofing iron, water heaters, water tanks, and sheet metal offcuts; Reinforcing bars or mesh – Used in the construction industry within concrete structures; Turnings – Remains of drilling or shaping steels ...
Hand scraping leaves a distinctive pattern on the scraped surface. This can be suggestive of a high level of precision in the ways; however, sometimes a surface can be marked to appear hand scraped, but it is really just a superficial surface treatment designed to give the impression of a scraped machine way.
A swaying granulator or a roll compactor can be used for the dry granulation. Dry granulation can be conducted under two processes; either a large tablet (slug) is produced in a heavy duty tabletting press or the powder is squeezed between two counter-rotating rollers to produce a continuous sheet or ribbon of material.
Steelmaking is the process of producing steel from iron ore and/or scrap. Steel has been made for millennia, and was commercialized on a massive scale in the 1850s and 1860s, using the Bessemer and Siemens-Martin processes. Two major commercial processes are used.
Cars can be crushed either dropping heavy weights onto them, using an excavator bucket or mechanical grab, but these rudimentary means can be time consuming and produces inconsistent scrap sizes. By contrast, having a dedicated car crushing machine speeds up the compacting process and results in more uniform scrap bundles.
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