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refractory ore

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  • Refractory — Re*frac to*ry ( r?), a. [L. refractorius, fr. refringere: cf. F. refractaire. See {Refract}.] 1. Obstinate in disobedience; contumacious; stubborn; unmanageable; as, a refractory child; a refractory beast. [1913 Webster] Raging appetites that are …   The Collaborative International Dictionary of English

  • Refractory metals — are a class of metals that are extraordinarily resistant to heat and wear. Refractory metals are said to be poorly resistant to oxidation and corrosion. [UFL EMA 6625: Advanced Metal Processing, Summer 2008, Lecture 09] These properties make them …   Wikipedia

  • refractory — refractorily, adv. refractoriness, n. /ri frak teuh ree/, adj., n., pl. refractories. adj. 1. hard or impossible to manage; stubbornly disobedient: a refractory child. 2. resisting ordinary methods of treatment. 3. difficult to fuse, reduce, or… …   Universalium

  • refractory — /rəˈfræktəri / (say ruh fraktuhree) adjective 1. stubborn; unmanageable: a refractory child. 2. resisting ordinary methods of treatment. 3. difficult to fuse, reduce, or work, as an ore or metal. –noun (plural refractories) 4. a material having… …  

  • refractory — re•frac•to•ry [[t]rɪˈfræk tə ri[/t]] adj. n. pl. ries 1) hard or impossible to manage; stubbornly disobedient: a refractory child[/ex] 2) resisting ordinary methods of treatment 3) mel difficult to fuse, reduce, or work, as an ore or metal 4) mel …   From formal English to slang

  • chromium processing — Introduction       preparation of the ore for use in various products.       Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857° C (3,375° F) and boils at 2,672° C (4,842° F). In the pure state, it is resistant to ordinary… …   Universalium

  • Gold extraction — or recovery from its ores may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore. [cite web url=http://geology.com/publications/getting gold/gold… …   Wikipedia

  • Black Hills Gold Rush — The Black Hills Gold Rush took place in Dakota Territory in the United States, and is general considered to have started 1860 70. It reached a peak in 1876.Rumors and poorly documented reports of gold in the Black Hills go back to the early 1800s …   Wikipedia

  • Violarite — (Fe2+Ni23+S4) is a supergene sulfide mineral associated with the weathering and oxidation of primary pentlandite nickel sulfide ore minerals.Violarite crystallises in the isometric system, with a hardness of 4.5 to 5.5 and a specific gravity of… …   Wikipedia

  • Digenite — from the East Colusa Mine, Butte, Montana, USA. Specimen size = 4.3 cm General Category Sulfide mineral …   Wikipedia

  • Gatsuurt Gold Mine — is an open pit gold mining site in Mongolia located about 110 km (70 mi) N of the capital Ulaanbaatar in Mandal sum (district) of Selenge Province in northern Mongolia. Gatsuurt gold mine is 35 E from Boroo Gold Mine.Gatsuurt is 100% owned by the …   Wikipedia

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