ã€China Aluminum Industry Network】 pretreatment technology includes: sorting, that is, the separation of plastics, rubber and other non-aluminum materials; washing, that is, to wash off waste oil and other substances in the aluminum; paint stripping, in order to reduce the scrap aluminum surface coating Pollution caused by incomplete combustion should pay attention to the paint stripping treatment of coated aluminum scrap before entering the furnace.
At the same time as the pretreatment, various non-aluminum materials were also separated and pure aluminum scrap was obtained, which is also a necessary guarantee for the smelting of high-quality aluminum alloys. As a large number of inclusions have been removed before smelting, the amount of additives is reduced, the smelting cycle is shortened, and the production costs are reduced accordingly, which shows the advantages of environmental management.
Scientifically choosing fuel science to economically select fuels can not only reduce energy consumption but also significantly change the environment. From the current point of view, liquid fuels have better environmental benefits than solid fuels and have high combustion efficiency. Gas fuels have better environmental benefits than liquid fuels and have better combustion efficiency. Therefore, when selecting fuels, gas fuels should be used as much as possible. However, due to conditions, gas fuels cannot be used anywhere. At present, many reclaimed aluminum enterprises have set up gas generators to convert solid fuels into gaseous fuels. This not only greatly reduces the pollution brought about by coal combustion, but also reduces the production costs due to the increase in combustion efficiency. This is undoubtedly a scientific one. s Choice.
The additives used in the aluminum industry are recycled without the use of additives that affect the environment, mainly solvents (covering agents) and refining agents. In view of the various additives currently used, it is generally believed that chlorine, hexachloroethane, and Zinc chloride and so on. The use of chlorine to refine aluminum melts is rare, but there are applications in some special alloys. Hexachloroethane and zinc chloride are also used. Some manufacturers produce non-toxic refining agents containing large amounts of hexachloroethane. It is recommended that companies choose additives that do not pollute the environment, such as inert gases or nitrogen.
Improve the processing technology of aluminum ash The content of aluminum in aluminum ash is relatively high and must be recycled. In order to avoid pollution from recycling aluminum from aluminum ash, it is recommended that companies with a size use rotary kiln to treat aluminum ash, or press mills to recover aluminum in aluminum ash, so that the pollution caused by the treatment of aluminum ash is reduced to a low level.
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