Recent survey data from the Brazilian Aluminum Association show that more than 96% of the aluminum cans consumed in the country are recycled, with the highest recycling rate in the world. According to the survey, it takes only 60 days on average for an aluminum can to be thrown into the trash can to return to the supermarket shelf.
The Brazilian website reported that the director of the largest domestic waste beverage can recycling company stated that this approach is not only conducive to environmental protection, but also plays an important economic and social role. He said: “Compared with the first processed aluminum products, recycled products can reduce electricity consumption by 90% and reduce carbon dioxide emissions by 90%. Now about 800 households in Brazil rely on collecting waste aluminum cans for their livelihoods. Its role is very important.”
It takes about 200 to 500 years for aluminum cans to degrade naturally in nature. In Brazil, recycling and reuse activities of this type of waste are becoming more common, and the recycling rate ranks first in the world. In addition, more than half (55.4%) of domestically produced aluminum products are made from recycled materials, far exceeding the world average (25.9%). According to Milton Rego, president of the Aluminum Association, this achievement should be attributed to the Brazilian factory that specializes in this type of recycling.
Developed countries have continuously introduced a series of new technological innovations in production, such as low-cost continuous smelting and treatment processes, which can upgrade low-grade scrap aluminum for manufacturing for casting, die casting, rolling and master alloys Used recycled aluminum ingots. Among them, the remelted secondary alloy ingots can be used to manufacture special thin plates for cans. The quality of the thin plates has reduced the quality of each can to only about 14g. Some recycled aluminum is even used to make the frame of computer floppy disk drives.
In the scrap aluminum cans recycling process, the smelting of recycled aluminum and the treatment of the melt are the key processes to ensure the quality of recycled aluminum metallurgy. The modification and refining and purification of aluminum melt can not only change the form of silicon in the aluminum-silicon alloy, purify the aluminum melt, but also greatly improve the performance of the aluminum alloy. The refining, deterioration, and purification of aluminum melt are currently mostly processed by flux refining and online degassing and filtering.