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'{{For|the Austrian municipality|Droß}} {{Refimprove|date=November 2009}} [[Image:Aluminium dross2.png|Aluminium dross|right|thumb|250px]] '''Dross''' is a [[mass]] of [[solid]] [[impurity|impurities]] floating on a [[molten metal]]. It appears usually on the melting of [[melting point|low-melting-point]] [[metal]]s or [[alloy]]s such as [[tin]], [[lead]], [[zinc]] or [[aluminium]], or by [[redox|oxidation]] of the metal(s). It can also consist of impurities such as paint leftovers. It can easily be skimmed off the surface before pouring the metal into a [[Molding (process)|mold]] or [[casting flask]]. With tin and lead the dross can also be removed by adding [[sodium hydroxide]] pellets, which dissolve the oxides and form a [[slag]]. Dross, as a solid, is distinguished from slag, which is a liquid. Dross product is not entirely waste material; aluminium dross, for example, can be [[Aluminium recycling|recycled]] and is used in secondary [[steelmaking]] for slag [[deoxidizer|deoxidation]].<ref>{{Citation | last = Kogel | first = Jessica Elzea | last2 = Society for Mining, Metallurgy, and Exploration | title = Industrial minerals & rocks: commodities, markets, and uses | page = 1406 | publisher = SME | year = 2006 | edition = 7th | url = http://books.google.com/books?id=zNicdkuulE4C&pg=PA1406 | isbn = 9780873352338 | postscript =.}}</ref> ==See also== * [[Inclusions in Aluminium Alloys]] ==References== {{Reflist}} ==External links== {{Wiktionary}} *[http://www.azom.com/details.asp?ArticleID=2150 AZoM.com – Aluminium Dross Recycling] *Herbert F. Lund. [http://books.google.com/books?id=gIn8o0b6zj0C&pg=PT975&dq=aluminium+dross++recycling&ei=fR_zSu6MDYSOygTCxPSmDw&client=firefox-a#v=onepage&q=&f=false The McGraw-Hill recycling handbook]. Chapter 37.23: [[United Kingdom]]: [[European Union]] Directive Percipitates [[Aluminum]] "Dross" [[Recycling]]. {{Metalworking navbox|castopen}} [[Category:Casting (manufacturing)]] [[Category:Metallurgy]] [[Category:Deoxidizers]] [[de:Schlacke (Metallurgie)]] [[pl:Zgar]]'