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Blasphemed
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Blast
blast away
Blast draught
blast effect
blast from the past
Blast hole
Blast lamp
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blast off
blast orifice
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blast trauma
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blast-
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BLAST; BLASTING
Blasted

blast furnace definitions

WordNet (r) 3.0 (2005)

n
1: a furnace for smelting of iron from iron oxide ores; combustion is intensified by a blast of air

Merriam Webster's

noun Date: 1706 a furnace in which combustion is forced by a current of air under pressure; especially one for the reduction of iron ore

Britannica Concise

Vertical shaft furnace that produces liquid metals by the reaction of air introduced under pressure into the bottom of the furnace with a mixture of metallic ore, fuel, and flux fed into the top. Blast furnaces are used to produce pig iron from iron ore for subsequent processing into steel; they are also employed in processing lead, copper, and other metals. The current of pressurized air maintains rapid combustion. Blast furnaces were used in China as early as 200 BC, and appeared in Europe in the 13th cent., replacing the bloomery process. Modern blast furnaces are 70-120 ft (20-35 m) high, have 20-45-ft (6-14-m) hearth diameters, use coke fuel, and can produce 1,000-10,000 tons (900-9,000 metric tons) of pig iron daily. See also metallurgy, smelting.

Webster's 1913 Dictionary

Blast Blast (bl[.a]st), n. [AS. bl[=ae]st a puff of wind, a blowing; akin to Icel. bl[=a]str, OHG. bl[=a]st, and fr. a verb akin to Icel. bl[=a]sa to blow, OHG. bl[^a]san, Goth. bl[=e]san (in comp.); all prob. from the same root as E. blow. See Blow to eject air.] 1. A violent gust of wind. And see where surly Winter passes off, Far to the north, and calls his ruffian blasts; His blasts obey, and quit the howling hill. --Thomson. 2. A forcible stream of air from an orifice, as from a bellows, the mouth, etc. Hence: The continuous blowing to which one charge of ore or metal is subjected in a furnace; as, to melt so many tons of iron at a blast. Note: The terms hot blast and cold blast are employed to designate whether the current is heated or not heated before entering the furnace. A blast furnace is said to be in blast while it is in operation, and out of blast when not in use. 3. The exhaust steam from and engine, driving a column of air out of a boiler chimney, and thus creating an intense draught through the fire; also, any draught produced by the blast. 4. The sound made by blowing a wind instrument; strictly, the sound produces at one breath. One blast upon his bugle horn Were worth a thousand men. --Sir W. Scott. The blast of triumph o'er thy grave. --Bryant. 5. A sudden, pernicious effect, as if by a noxious wind, especially on animals and plants; a blight. By the blast of God they perish. --Job iv. 9. Virtue preserved from fell destruction's blast. --Shak. 6. The act of rending, or attempting to rend, heavy masses of rock, earth, etc., by the explosion of gunpowder, dynamite, etc.; also, the charge used for this purpose. ``Large blasts are often used.'' --Tomlinson. 7. A flatulent disease of sheep. Blast furnace, a furnace, usually a shaft furnace for smelting ores, into which air is forced by pressure. Blast hole, a hole in the bottom of a pump stock through which water enters. Blast nozzle, a fixed or variable orifice in the delivery end of a blast pipe; -- called also blast orifice. In full blast, in complete operation; in a state of great activity. See Blast, n., 2. [Colloq.]

Collin's Cobuild Dictionary

(blast furnaces) A blast furnace is a large structure in which iron ore is heated under pressure so that it melts and the pure iron metal separates out and can be collected. N-COUNT



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