See:hygrometer; wet-bulb thermometer.
In sizing analysis of fine material, preliminary screening by washing a
weighed sample on a 200-mesh screen, perhaps with use of a dispersing
agent, such as sodium silicate. Removal of the minus fraction (which is
settled and later brought into account) is followed by drying of the
on-size and by standard sizing analysis. Screen action is thus rendered
more efficient. Pryor, 3
Any type of assay procedure that involves liquid, generally aqueous, as a
means of separation. CF:dry assay
AGI
Shot firing in wet holes. Special explosives are available for wet
conditions, and the detonator wires must be well insulated to prevent
short-circuiting and misfires. Nelson
a. The temperature of the air as measured by a wet-bulb thermometer; it is
lower than the dry-bulb temperature (for all cases except when the air is
saturated)--ininversely proportion to the humidity. Strock, 2
b. The lowest temperature which can be produced in a given air by the
evaporation of moisture into that air. Spalding
c. Temperature at which water evaporating into air can bring the air to
saturation adiabatically at that temperature--a measure of the evaporating
capacity of air. Indicated by a thermometer with a wetted wick. Measured
in degrees C. Hartman, 2
An instrument that measures the evaporating capacity of air. Lewis
A coal-cleaning method that involves the use of washers plus the equipment
necessary to dewater and heat-dry the coal. This method is generally used
when cleaning the coarser sizes of coal. It is a more expensive method
than air cleaning and creates the additional problem of water pollution.
Coal can, however, be cleaned more accurately by this method than by air
cleaning. See also:froth flotation; washery. Kentucky
A clutch that operates in an oil bath. Nichols, 1
Reactor criticality achieved with a coolant. Lyman
A method of dust prevention in which water is delivered onto a moving
cutter chain, through water pipes, and is carried into the cut where it is
intimately mixed with the cuttings. This method is successful in seams up
to 4 ft (1.22 m) thick. Mason
See:cyclone
In rock drilling for blasting purposes, injection of water through a
hollow drill shank to the bottom of a hole, to allay dust and danger of
pneumoconiosis.
Lead ore with high silver content. During smelting, the lead trickles
through the mass and collects gold and/or silver, which are later
recovered. Nelson
a. Any milling operation carried on in water or a liquid.
Enam. Dict.
b. The practice of applying a coolant to the work and the wheel to
facilitate the grinding process. ACSG, 2
c. Comminution of ore in aqueous suspension; typically practiced in the
ball milling of finely crushed rock. See also:grinding
Pryor, 3
A furnace with a perforated iron bottom, under which a blast is
introduced, and upon which zinc ore (red oxide) is reduced. A muffle
furnace for roasting zinc ores. Fay
Wetherill's magnetic separator
An apparatus for separating magnetic minerals from nonmagnetic minerals.
It consists of two flat belts, the upper of which is the wider, run
parallel to each other and over long magnets set obliquely to the belts.
Consequently, magnetic particles are drawn up against the upper belt, and
as they pass beyond the influence of the magnets, fall from the edge past
the other belt into a bin. Another form operates by belts moving across
the line of travel of the main belt. Liddell
Wetherill vacuum casting process
In this process, a mold, arranged for bottom feeding, is placed inside a
vacuum bell; the bottom of the mold is connected by a tube to a ladle
containing the molten metal, which is sucked into the mold cavity when a
vacuum is formed. Osborne
A multiple-deck, horizontal furnace for calcining sulfide ores. It
resembles the Keller furnace. Fay
See:hydrometallurgy
Any hydrometallurgical process, such as the cyanide process, flotation
process, etc. See also:wet process
Comminution of ores and materials in the presence of a liquid in a
suitable mill, either by rods, balls, or pebbles, or autogenously, by the
material itself. See also:dry milling