A machine for the size classification of the fine ceramic powders, such as
china clay; the velocity of an air current controls the size of particle
classified. Dodd
a. The property of a material to develop high strength when dried; e.g.,
air-setting mortars. ARI
b. In a material such as a castable refractory, refractory mortar, or
plastic refractory, the ability to harden without the application of heat.
AISI
A shaft used wholly or mainly for ventilating mines, for bringing fresh
air to places where miners are working, or for exhausting used air. It may
be used as an intake (downcast) shaft or a return (upcast) shaft.
See also:downcast; upcast. Syn:air pit
In seismic prospecting, a technique of applying a seismic pulse to the
ground by detonating explosive charges in the air. AGI
A shot prepared by loading (charging) in such a way that an airspace is
purposely left in contact with the explosive for the purpose of lessening
its shattering effect. Fay
The volume decrease that a clay undergoes in drying at room temperature.
Slaked by exposure to the air; as lime. Standard, 2
Exposure of quicklime to the atmosphere to give slow hydration.
Pryor, 3
York. A short heading driven more or less at right angles to and between
two headings or levels for ventilation. See also:stenton
A mass of air under compression entrapped in the liquid circulated through
a borehole drill string or a liquid-piping system. Long
A compartment or passageway carried beneath the floor of a heading or of
an excavation in a coal mine for ventilation. See also:sollar
The ratio of a volume of water that can be drained from a saturated soil
under the action of force of gravity to a total volume of voids.
ASCE
A separator consisting of two concentric right-vertical tubes, a
conventional cyclone header at the top, and a froth pedestal at the
bottom. The inner tube is a porous-wall tube. The slurry is fed
tangentially through the cyclone header to develop a radial swirl flow.
Air is sparged through the jacketed, inner porous tube wall and is sheared
into small bubbles by the swirl flow. Hydrophobic coal particles in the
slurry attach to the air bubbles and report as overflow product. The
hydrophilic refuse particles remain wetted and report as underflow
product.
The division of the main current of air in a mine into two or more parts.
See also:split
A chimney formerly used to ventilate a mine.
Gas trapped beneath mica cleavage surfaces in flattened pockets, tiny
bubbles, or groups of closely spaced bubbles. Skow
A starter used on large coal haulers that permits the elimination of all
batteries except the 6-V units for the headlights. These starters are
operated by compressed air supplied at 100 psi (690 kPa) from a storage
tank on the tractor. Trucks can stand idle for 4 or 5 days and there is
still enough air in the tanks to start the engines. Coal Age, 3
The machine used for blowing the stone chippings into the waste area in
pneumatic stowing. It consists of a steel paddle wheel revolving in an
adjustable casing. Stowing dirt is fed continuously from a hopper to the
machine, which in turn blows the material through pipes 5 to 6 in (13 to
15 cm) in diameter into the waste area. See also:pneumatic stowing
Nelson
In mica, a series of air inclusions connected (or nearly connected) to
form a relatively long, thin streak. Also known as silver streak.
Skow
In mining, a check on ventilation, gas, and dust in a mine.
Pryor, 3
See:ball mill