Aluminum UBC Decoating Process: Reduce Dross When Smelting. Dross is a layer of impurities that forms on the surface of molten #aluminum during the #smelting process. Effective decoating helps minimize the presence of non-metallic materials and contaminants, such as coatings and labels. The UBC #decoating plant generally consists of three parts: UBC shredding, crushing and pyrolysis rotary kiln. If you want to know about Decoating equipment, please contact us. Email: [email protected]