dross
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(drŏs, drôs) 
n.
n.
- Waste or impure matter: discarded the dross after recycling the wood pulp.
- The scum that forms on the surface of molten metal as a result of oxidation.
- Worthless, commonplace, or trivial matter: "He was wide-awake and his mind worked clearly, purged of all dross" (Vladimir Nabokov).
[Middle English dros, from Old English drōs, dregs.]
drossy dross'y adj.Word Tutor:
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dross
IN BRIEF: Scum that forms on molten metal.
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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For the Austrian municipality, see Droß.
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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Contents
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Etymology and usage
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]
See also
References
- ^ Kogel, Jessica Elzea; Society for Mining, Metallurgy, and Exploration (2006), Industrial minerals & rocks: commodities, markets, and uses (7th ed.), SME, p. 1406, ISBN 978-0-87335-233-8, http://books.google.com/books?id=zNicdkuulE4C&pg=PA1406.
- ^ a b "Dross". www.etymologyonline.com. http://www.etymonline.com/index.php?term=dross.
- ^ Chambers's Etymological Dictionary of the English Language. W & R Chambers. 1875. pp. 142. http://books.google.co.uk/books?id=kf8n2v9ZjxIC.
- ^ "Ezekiel 22:18". The Bible (King James version). http://www.biblegateway.com/passage/?search=Psalms%20119:119;Ezekiel%2022:18,19&version=KJV.
- ^ "Proverbs 25:4". The Bible (King James version). http://www.biblegateway.com/passage/?search=Proverbs%2025:4;26:23&version=KJV.
- ^ "Alma 32:3". The Book of Mormon. http://scriptures.lds.org/en/alma/32/3.
Notes
- ^ In the Book of Ezekiel 22 v 18 : "Son of man, the house of Israel is to me become dross: all they are brass, and tin, and iron, and lead, in the midst of the furnace; they are even the dross of silver.",[4] in the Book of Proverbs,[5] and in the Book of Mormon (Alma 32:3 ) "Therefore they were poor; yea, they were esteemed by their brethren as dross..".[6]
External links
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Look up dross in Wiktionary, the free dictionary. |
- AZoM.com – Aluminium Dross Recycling
- Herbert F. Lund. The McGraw-Hill recycling handbook. Chapter 37.23: United Kingdom: European Union Directive Percipitates Aluminum "Dross" Recycling.
- Residues from aluminium dross recycling in cement
- DrosRite Aluminum Recycling Process
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This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Translations:
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Dross
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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