A machine that separates coal from associated impurities in run-of-mine
material. See also:coal-preparation plant
A slurry containing particles of such size range that 50% or more (by
weight) will pass a 200-mesh sieve (or finer).
A slurry that has been partly dewatered by sedimentation, usually to a
dilution that will permit further dewatering by mechanical means.
Finely crushed coal mixed with sufficient water to form a fluid. To use
coal slurry pumped through a pipeline as fuel, expensive drying and
dewatering pretreatment has been necessary. Recent tests indicate that
coal slurry can be fired in a cyclone furnace as it is received from a
pipeline; i.e., a coal and water mixture. See also:slurry
Nelson
A suspension of very fine particles in air. A coal that breaks down easily
when heated gives off its volatile matter very easily and perhaps more
quickly than the available draft can supply the air for combustion, with
the result that dark smoke containing much unburnt or partly burnt
material is given off--a loss of fuel energy. See also:smoke
Nelson
Explosive; used in mines. Bennett
See:split seam
a. In bituminous coal mining, one who sets short wooden props in a
slanting position (sprags) under the upper or overhead section of a bed of
coal to hold that section up while the lower section is being mined, or
wedges heavy slanting props (sprags) against the coal to prevent it from
flying when broken down by blasting. DOT
b. One who places short pointed wooden sprags between the spokes of a mine
car wheel to stop the car.
In bituminous coal mining, a general term applied to a worker who is
engaged in mining coal in a strip mine, one in which the coal is close
enough to the Earth's surface to permit the use of power shovels in
stripping back the ground and loading the coal into large cars or trucks.
Usually designated according to particular jobs. DOT
Coal excluding its mineral matter and moisture. BS, 4
Tar obtained by the destructive distillation of bituminous coal, usually
in coke ovens or in retorts, and consisting of numerous constituents (such
as benzene, xylenes, naphthalene, pyridine, quinoline, phenol, cresols,
light oil, and creosote) that may be obtained by distillation.
Webster 3rd
Oil obtained by the distillation of coal tar. Oils are classified into
light and heavy oils. A light oil is one having a specific gravity less
than 1.000 and contains the coal-tar napthas. Heavy oils sink in water and
contain such compounds as creosote, anthracene, anthracene oil, etc.
Porter
A dark-brown to black residuum from the distillation of coal tar, ranging
from a sticky mass to a brittle solid, depending on the degree of
distillation. Most coal-tar pitch melts between 60 degrees C and 70
degrees C. Hess
Evaluating coals by methods other than chemical, such as determining the
relative values of different coals as fuels by burning them under
controlled conditions in furnaces, or determining their gas- and
coke-producing properties by testing in a retort. The term coal testing is
frequently erroneously used, esp. in coal marketing, for coal analysis.
Any measurement instrument that is designed to measure the thickness of
the coal remaining on the mine roof or floor after coal is removed by
mining.
See:tipple
a. A variety of coal, such as common banded coal, cannel coal, algal coal,
and splint coal. The distinguishing characteristics of each type of coal
arise from the differences in the kind of plant material that produced it.
AGI
b. A coal, particularly a bituminous coal, contains dissimilar bands or
layers that are believed to have been formed mainly from selected portions
of the plant material forming the seam. These bands, which have been given
the terms vitrain, clarain, durain, and fusain, are the different types of
coal in that seam. See also:vitrain; clarain; durain; fusain.
Nelson
A place where mined coal is treated by sink-float methods or by froth
flotation to remove ash, shale, sulfur, and other unwanted products. The
resulting clean coal product is graded to size and regulated for maximum
ash content. Also called cleaning plant; preparation plant.
In the iron and steel industry, a laborer who shovels coal into a
wheelbarrow and pushes it to a furnace. DOT
A coal mine with its appurtenances; a colliery. Coal works.
Standard, 2; Fay
A place where coal is stored. Craigie