Passage: Recovery of the metal through recycling has become an important task of the aluminium industry. Recycling was a low-profile activity until the late 1960s, when the growing use of aluminium beverage cans brought it to public awareness. Recycling involves melting the scrap, a process that requires only 5% of the energy used to produce from aluminium ore, though a significant part (up to 15% of the input material) is lost as dross (ash-like oxide). An aluminium stack meltter produces significantly less dross, with values reported below 1%. White dross from primary aluminium production and from secondary recycling operations still contains useful quantities of aluminium that can be extracted industrially. The process produces aluminium billets, along with a highly complex waste material. This waste material is to manage. It reacts with releasing, an important mixture of concrete water (including copper, acetylene, among others, waste gases), as it is difficult to ignite ammonia and ammonia as it comes into contact with the air. Pertanyaan: Naon hasilna tina prosés ieu?
industri aluminium