Starting a blast furnace. Syn:blow in
Blowing air through the hole at casting, to clean the hearth of iron and
cinder. Fay
S. Staff. An intake, or fresh-air road in a mine.
A small set of blasting implements. CF:blasting supplies
Standard, 2; Fay
A furnace used for sintering ore and for the volatilization of lead and
zinc. Fay
Mine ventilation in which the air flows from the fan at the portal toward
the working face.
Pig iron purified by blowing air through it.
A shot that dissipates the explosive force by blowing out the stemming
instead of breaking down the coal. It may be caused by insufficient
stemming, overcharging with explosive, or a burden that is too much for
the charge to dislodge. See also:gun; blow. Syn:cannon shot;
gunned shot. Nelson
a. A large mineralized outcrop beneath which the vein is smaller, e.g., a
great mass of quartz that conceals a vein only a few feet wide.
b. A shot or blast that goes off like a gun and does not shatter the rock;
a windy shot.
c. A large outcrop beneath which the vein is smaller is called a blowout.
(slang) Fay
d. The high-pressure, sometimes violent, and uncontrolled ejection of
water, gas, or oil from a borehole. Long
e. Used by prospectors and miners for any surface exposure of strongly
altered discolored rock associated, or thought to be associated, with a
mineral deposit. AGI
f. Used by miners and prospectors for a large, more or less isolated,
usually barren quartz outcrop. Known in Australia as blow. Hess
g. To put a blast furnace out of blast, by ceasing to charge fresh
materials, and continuing the blast until the contents of the furnace have
been smelted. Fay
h. To smelt the iron-bearing materials in the furnace, adding domestic
coke so that the stockline is about normal. Camp
i. A general term for a small saucer-, cup-, or trough-shaped hollow or
depression formed by wind erosion on a preexisting dune or other sand
deposit, esp. in an area of shifing sand or loose soil, or where
protective vegetation is disturbed or destroyed; the adjoining
accumulation of sand derived from the depression, where recognizable, is
commonly included. Some blowouts may be many kilometers in diameter.
AGI
An improperly placed or overcharged shot of black blasting powder in coal
(where used), frequently results in a mine explosion.
von Bernewitz
a. Sand blown by onshore winds across a barrier and deposited on its
landward side or as a veneer in the lagoon; e.g., along the Gulf Coast of
Texas. CF:washover
b. The process of forming a blowover. AGI
a. The decomposition of a compound or mineral when heated by the blowpipe,
resulting in some characteristic reaction, as a coloring of the flame or a
colored crust on a piece of charcoal. Standard, 2
b. A method of analysis in mineralogy. Fay
a. A rapid method for the determination of the approximate composition of
minerals and ores. Blowpipe tests are merely qualitative; i.e., they
indicate the presence of the different constituents, but not the
proportions. A blowpipe consists of a plain brass tube capable of
producing a flame of intense heat that may be either oxidizing or
reducing. Illuminating gas from a Bunsen burner is the fuel commonly used.
The color, nature, and smell of the encrustations suggest the nature of
the elements present. See also:bead; borax bead test. Nelson
b. The use of a bent tube with a condensation trap and a small hole to
direct one's concentrated breath into a small flame from a gas or alcohol
lamp to produce intense heat in both oxidizing and reducing flames for the
purpose of soldering metals or of performing qualitative analyses on
powdered mineral samples. See also:oxidizing flame; reducing flame.
a. Eng. An explosion of combustible gases in a mine.
b. To allow atmospheric air access to certain places in coal mines, so as
to generate heat, and ultimately to cause gob fires.
Heating hot-rolled ferrous sheet in an open furnace to a temperature
within the transformation range, and then cooling it in air in order to
soften the metal. The formation of a bluish oxide on the surface is
incidental. ASM, 1
A name for crocidolite, the asbestiform variety of riebeckite.
A thin, persistent bed of bluish clay that is found near the base of the
No. 6 coal throughout the Illinois-Indiana basin.
Corvusite, extremely high-grade vanadium ore with blue-black color.
Ballard
Brittleness exhibited by some steels after being heated to some
temperature within the range of 300 to 650 degrees F (149 to 343 degrees
C), particularly if the steel is worked at the elevated temperature.
ASM, 1
The characteristic blue halo, or tip, of the flame of a safety lamp when
combustible gases are present in the air. See also:top; cap.
See:sapphirine