Any coal microlithotype containing 20% to 60% by volume of carbonate
minerals (calcite, siderite, dolomite, and ankerite). AGI
Any coal microlithotype containing 20% to 60% by volume of clay minerals,
mica, and in lesser proportions, quartz.
a. A commercial term for calcium carbide formerly used in miner's lamps.
Fay
b. The carbide compound of tungsten. Long
c. The bit-crown matrices and shaped pieces formed by the pressure molding
and sintering of a mixture of powdered tungsten carbide and other binder
metals, such as cobalt, copper, iron, and nickel.
See also:cemented carbide; sintered carbide. Long
d. A compound of carbon with one or more metallic elements. ASM, 1
Shaped piece of a hard metal compound, sometimes inset with diamonds,
formed by the pressure molding and sintering of a mixture of powdered
tungsten carbide and other binder metals, such as iron, copper, cobalt, or
nickel. Inset into holes, slots, or grooves in bits, reaming shells, or
core barrels, the hard metal pieces become cutting points or
wear-resistant surfaces. Also called carbide slug. Long
A lamp that is charged with calcium carbide and water and burns the
acetylene generated. Syn:acetylene lamp
A push-button mining machine with a potential range of 1,000 ft (304.8 m)
into a seam from the highwall, a maximum production of some 600 st (544 t)
per shift, and a recovery of 65% to 75% of the coal within the reach of
the machine. This unit is a continuous miner working controlled from
outside the seam of coal. The operator can control both the vertical and
horizontal direction of the cutting heads as shown on an oscilloscope
screen. As the cutting head advances into the coal seam, it drags a series
of conveyor sections behind it, which in turn deposit the coal into a
truck. Krumlauf
Compounds of carbon with iron and other elements in steel; e.g., Fe (sub
3) C (cementite), Fe4 W2 C , and Cr4 C2 .
CTD
See:carbide insert
A cutting tool--made of tungsten carbide, titanium carbide, tantalum
carbide, or combinations of them, in a matrix of cobalt or nickel--having
sufficient wear resistance and heat resistance to permit high machining
speeds. ASM, 1
Trade name for an explosive. Hess
A combining form meaning carbon, as in carbohydrate.
A Latin name for charcoal, later transferred to fossil coal.
Tomkeieff
Clay-bonded silicon carbide; used as refractory. Bennett
A variety of hydrocarbon containing about 8% rare earths and found
enclosed in a mineral kondrikite. From the Khibine Peninsula, Russia.
Tomkeieff
A form of dynamite in which fine charcoal is used as the absorbent.
Webster 2nd
An amorphous carbonaceous substance, a product of decomposition of plants
and impregnating plant remains, which undergo transformation into coal. It
is assumed to be present in coal in the form of structureless jelly.
Syn:jelly; fundamental jelly; fundamental substance; gelose; jelly;
vegetable jelly. Tomkeieff
a. Of, pertaining to, or derived from carbon and oil; of or pertaining to
coal-tar oil. Standard, 2
b. Of or pertaining to carbolic acid. Hess
White; crystalline; deliquescent; C6 H5 OH; a burning taste;
and an odor resembling that of creosote. Contained in the heavy oil of
coal tar, from which it is distilled at between 165 degrees C and 190
degrees C. It is a caustic poison. Antidotes are epsom salts, alcohol, and
heat. See also:phenol
A byproduct in iron smelting, consisting of calcium-aluminum silicon
carbide; used as a substitute for calcium carbide. Standard, 2
a. A nonmetallic element, found free in nature in three allotropic forms:
amorphous, graphite, and diamond. A fourth form, known as "white" carbon,
is now thought to exist. Symbol, C. Graphite is one of the softest known
materials, while diamond is the hardest. Occurs as a constituent of coal,
petroleum, natural gas, and all organic compounds. The isotope, carbon 14,
is radioactive and is used as a tracer in biological and organic chemical
research. Handbook of Chemistry and Physics, 3
b. Rand term for thucolite in banket ore. Pryor, 3
c. A gray-to-black, opaque, tough, hard cryptocrystalline aggregate of
diamond crystals occurring in irregular shapes and sizes. It is classed as
an industrial diamond and formerly was used extensively as a
cutting-medium inset in diamond-drill bits. More recently, only
occasionally used in diamond bits and other tools. Also called black
diamond; carbonado. See also:diamond
A radioactive isotope of carbon having the atomic weight of 14, produced
by collisions between neutrons and atmospheric nitrogen. It is useful in
determining the age of carbonaceous material younger than 30,000 years
old. See also:carbon; carbon-14 dating.