“Dross” can be defined as a mass of solid impurities that float on the surface of a molten galvanizing bath.  Dross forms as a product of oxidation in which the molten bath acquires impurities due to contact with the atmosphere while at elevated temperature (Typically between 800º F & 1100º F depending on alloy composition).  If dross is not regularly removed from the surface of the molten galvanizing bath surface defects on the metal product such as streaking will occur quickly.  Due to the regenerating layer of dross on a molten galvanizing bath, frequent dross removal is required.

Historically, dross removal has been a manual process in which a human operator must use a long metal spoon to scoop and remove solidified dross matter.  This task, when performed by a human, is dangerous, arduous, and monotonous.  Dangers to the human operator include molten metal splashing, repetitive heavy lifting, high ambient temperature, cramped work conditions, and worst of all… the risk of falling into the molten bath.  These factors make it easy to justify a Nachi Robotic Dross Removal Solution.