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The main components of the higher-grade scrap aluminum chips include cast aluminum alloy, alloy aluminum, and pure aluminum. Among them, the first two are of many brands, and it is difficult to classify them according to brand numbers. In large-scale reclaimed aluminum plants, screening is generally only adopted to remove the mixed-in The soil, etc., can be directly smelted into the furnace. In the small-scale reclaimed aluminum enterprises, such scrap aluminum will be manually divided into cast aluminum alloy, alloy aluminum and pure aluminum, and then used separately.
(2) Low-grade slices
For the low grade slicing and incineration of shredded aluminum scrap (which is not normally used in large-scale reclaimed aluminum plants), more complex sorting is required due to its extremely complex composition, including scrap, scrap copper, and scrap in addition to aluminum scrap. Lead and other metals, and contain other waste. The sorting of such wastes mainly depends on labor. The soil and waste are first screened out and then manually sorted. Most of the manual sorting operations are carried out on the operator's desk. They rely mainly on the visual inspection and experience of the workers to sort out the non-metal scraps, and then sort the scrap metal, among which the selection of the scrap copper and the scrap pure aluminum is particularly meticulous, because the scrap copper can be To increase production value, pure aluminum scraps, such as scrap aluminum wire, are raw materials for the adjustment of recycled aluminum. Separated waste aluminum is mixed and generally no longer subdivided.
At present, the pretreatment of domestic scrap aluminum has not basically achieved mechanization and automation, mainly relying on low-cost labor, and the tools used are magnets and steel slumps, which are based on experience. This sorting method has low efficiency, poor quality, and high cost. Most of waste non-ferrous metals such as copper in waste aluminum are contaminated, and manual sorting is difficult and has fallen far behind. It is necessary to research and promote advanced waste aluminum pretreatment technology.
Waste aluminum chip pretreatment method
(1) High-grade slices