Dross is a mass of solid impurities floating on a molten metal or dispersed in the metal, such as in wrought iron. It forms on the surface of low-melting-point metals such as tin, lead, zinc or aluminium or alloys by oxidation of the metal. With wrought iron, hammering and later rolling removed some dross.

Can dross be used for anything?

A variety of products can be made from the residual aluminium dross after it is recycled into aluminium oxide. ... Aluminium oxide has a variety of industrial uses which includes being used in paint, dye, concrete, explosives, and fertilizer.

Why is dross bad?

Secondly, aluminium dross if left untreated interferes into the natural microbial activity in the waste and ignite or pyrolysize surrounding solid waste materials. Chemical reactions involving aluminium can also release large amount of highly toxic and/or flammable gases which can aggravate pollution manifold.