a. A limestone quarry. Webster 3rd
b. A pit where lime is made. Webster 3rd
A term used in the Southeastern United States (esp. Florida and Georgia)
for an unconsolidated or partly consolidated form of limestone, usually
containing shells or shell fragments, with a varying percentage of silica.
It hardens on exposure and is sometimes used as road metal. Also spelled
limerock. AGI
An infusible slag, too high in lime, in an iron blast furnace.
Scot. Calcined limestone.
Person who mixes lime and water in rotary slaker or open batch tank to
make milk of lime (slaked lime). Also called lime mixer; milk-of-lime
slaker; slaker. DOT
A process for manufacturing alumina, Al2 O3 . The raw
material, such as clay or anorthosite, is sintered with limestone and soda
ash to form sodium aluminate and calcium silicate. This sinter is then
leached with water, caustic soda solution, or sodium aluminate liquor to
dissolve the soluble sodium aluminate. The resulting slurry is then
filtered, and the liquor is decomposed as in the Bayer process or is
treated with carbon dioxide to precipitate hydrated alumina. When operated
in conjunction with the Bayer process to recover alumina and soda from red
mud, it is called the combination process.
a. A sedimentary rock consisting chiefly (more than 50% by weight or by
areal percentages under the microscope) of calcium carbonate, primarily in
the form of the mineral calcite, and with or without magnesium carbonate;
specif. a carbonate sedimentary rock containing more than 95% calcite and
less than 5% dolomite. Common minor constituents include silica
(chalcedony), feldspar, clays, pyrite, and siderite. Limestones are formed
by either organic or inorganic processes, and may be detrital, chemical,
oolitic, earthy, crystalline, or recrystallized; many are highly
fossiliferous and clearly represent ancient shell banks or coral reefs.
Limestones include chalk, calcarenite, coquina, and travertine, and they
effervesce freely with any common acid. Abbrev. ls. AGI
b. A general term used commercially (in the manufacture of lime) for a
class of rocks containing at least 80% of the carbonates of calcium or
magnesium and which, when calcined, gives a product that slakes upon the
addition of water. AGI
Dust prepared by grinding limestone; used to dilute the coal dust
accumulation in a mine so that the dust does not form explosive mixtures
with air. Rice, 2
Natural water with large amounts of dissolved calcium bicarbonate or
calcium sulfate. AGI
A charge that gives a complete loosening of the rock without throwing it
excessively.
A somewhat loose term used to denote the maximum stress at which a
material will not creep by more than a certain amount within the working
life of the part. It is also used in some short-time creep tests; e.g.,
the Hatfield time yield. Hammond
The maximum current density that can be used to get a desired electrode
reaction without undue interference, such as may come from polarization.
ASM, 1
The maximum railway gradient that can be climbed without the help of a
second power unit. Syn:ruling gradient
The mixture of coal and rock dusts that will not permit the propagation of
an explosion. Rice, 2
The line joining the coal face underground and the surface limit of draw;
the boundary of a mine. Nelson
The point on the surface beyond which no movement occurs. Nelson
The point on a stress-strain curve at which the strain ceases to be
proportional to the stress. Its position varies with the sensitivity of
the extensometer used in measuring the strain. CTD
a. Extreme concentration limits of a combustible in an oxidant through
which a flame, once initiated, will continue propagating at a specified
temperature and pressure. Van Dolah
b. Usually expressed as the limiting percentages of methane in air, beyond
which the mixture is no longer flammable. The lowest percentage of methane
in air that yields a flammable mixture is called the lower limit of
flammability, and the highest percentage of methane in air to yield a
similar mixture is called the higher limit of flammability. These limiting
percentages depend on a number of factors, such as the initial temperature
and pressure; whether the mixture is at rest or moving; the manner in
which the mixture is confined, etc. With methane mixtures at ordinary mine
pressures and temperatures, the widest limits of flammability are (1)
lower limit of flammability about 5.4% of methane in air; (2) higher limit
of flammability about 14.8% of methane in air. See also:methane
Nelson
a. A device fitted to an electrically driven hoist or winding engine that
becomes effective at the end of a wind to prevent the cage overwinding or
underwinding. Nelson
b. A control to limit some function. Strock, 2
a. Said of coal deposits formed inland in freshwater basins, peat bogs, or
swamps, as opposed to paralic coal deposits. CF:paralic
b. Said of peat formed beneath a body of standing water. Its organic
material is mainly planktonic. AGI