
[Middle English dros, from Old English drōs, dregs.]
drossy dross'y adj.
This discipline and rough treatment are a furnace to extract the silver from the dross. This testing purifies the gold by boiling the scum away.
— Mevlana Rumi (1207-1273), Persian sufi mystic from Rumi Daylight: A Daybook of Spiritual Guidance.
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Dross is a mass of solid impurities floating on a molten metal. It forms on the surface of low-melting-point metals such as tin, lead, zinc or aluminium or alloys by oxidation of the metal(s).
With tin and lead the dross can also be removed by adding sodium hydroxide pellets, which dissolve the oxides and form a slag. Dross can also be skimmed off.
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 recycled and is used in secondary steelmaking for slag deoxidation.[1]
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The term dross derives from the Old English word dros, meaning the scum produced when smelting metals. By the 15th Century it had come to refer to rubbish in general.[2] Dregs[2] and the geological term druse are also thought to be etymologically related.[3] Metallurgical dross is referenced as a metaphor for worthless material in the Bible and in other religious texts.[note 1]
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Dansk (Danish)
n. - affald, skum, slagger
Nederlands (Dutch)
rommel, metaalschuim
Français (French)
n. - (Métal) scories, crasse, impuretés, déchets, rebut
Deutsch (German)
n. - Abfall, Dreck, (tech.) Gekrätz, Abschaum
Ελληνική (Greek)
n. - έλκυσμα (αφρός ή σκωρία λιωμένου μετάλλου), ακαθαρσίες, απορρίμματα
Português (Portuguese)
n. - escória (f), resíduo (m)
Русский (Russian)
окалина, шлак
Español (Spanish)
n. - escoria, basura
Svenska (Swedish)
n. - orenlig, slagg
中文(简体)(Chinese (Simplified))
浮渣, 渣滓, 碎屑
中文(繁體)(Chinese (Traditional))
n. - 浮渣, 渣滓, 碎屑
한국어 (Korean)
n. - 앙금, 불순물, 쓸모 없는 물건
日本語 (Japanese)
n. - 浮きかす, くず, かす
العربيه (Arabic)
(الاسم) رغوة المعادن المنصهرة, نفايه
עברית (Hebrew)
n. - סיג, פסולת
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