Decoating is the process by which paint, ink, paper, plastic and oil are removed from the surface of a material usually metallic, to enhance recyclables. When coated scrap aluminum is melted directly in the furnace there will be substantial metal loss that will vary depending on many factors including.

OVERSIZE SCRAP ALLOWED

• Input size allowed up to 250 mm
• The Decoating Kiln is designed with a special Hengyang shape paddle to optimize the scramble and skim of the scrap and to remove efficiently the totality of the organics presence
• The More The Better! Thanks to the oversize scrap input, the system has a major organics laps effect on the surface and therefore a major organics evaporation (= more natural fuel)
• Less energy consumption in the Shredding phase as there’s no need to “polverize” or heavily reduce the size of the scrap
• Less Natural Gas consumption thanks to the elevated presence of organics in the process

More than 90 % of decoating is currently carried out in rotary kiln. The choice of rotary kiln is between parallel and the counter flow type. Hot gas flows through the kiln under controlled condition of temperature and oxygen content. The kiln exit gas containing evolved combustible is passed to an after burner and is combusted. A significant proportion of the combustion product is returned to the kiln for the processing, thus creating a recirculation loop. The most obvious choice is counter flow type kiln. In counter flow kiln the hot gases from the afterburner enters the kiln at the metal discharge end and flows counter to the scrap movement. This ensures the highest temperature and oxygen are in contact with the scrap exactly where it is needed. Consequently, counter flow kiln produce very good quality decoating. As the gas travels from discharge to charge end of the kiln there is an accompanying reduction in temperature excursion and removing the necessity for water sprays. Counter flow kiln do not require an internal refractory lining