Tables used in ore dressing for sorting fine material by means of a film
of flowing water. These tables may be considered as surface tables, from
which the products are removed before they have found a bed, so that the
washing is always done on the same surface; also building tables or
buddles, on which the products are removed after they have formed a bed.
These use the relative transporting power of a film of water flowing on a
quiet surface, which may be either rough or smooth, to act upon the
particles of a water-sorted product. The smaller grains, of high specific
gravity, are moved down the slope slowly or not at all by the slow
undercurrent; the larger grains, of lower specific gravity, are moved
rapidly down the slope by the quick upper current. Liddell
a. A device for separating suspended solid particles from liquids, or fine
dust from air. It incorporates a membrane on which the solids are
retained. See:bag filter; drum filter; Genter filter;
plate-and-frame filter. See also:vacuum filtration
b. To subject to the action of a filter; to pass a liquid or a gas through
a filter for the purpose of purifying, or separating, or both. To act as a
filter; to remove from a fluid by means of a filter; to percolate.
Webster 3rd
c. An electronic device in seismic instruments that permits selection of
frequency characteristics appropriate for the ground motion it is desired
to record. AGI
d. A layer, or a combination of layers, of pervious materials designed and
installed in such a manner as to provide drainage and yet prevent the
movement of soil particles by flowing water. Also called protective
filter. ASCE
e. To utilize a filter, as to clarify or purify a liquid or gas.
a. A low-density, inert, fibrous, or fine granular material used to
increase the rate and improve the quality of filtration. ASM, 1
b. Diatomaceous earth, used either to coat a filter cloth or as a thick
filtering layer that can be plowed off with its load of cake from a
rotating drum filter. Pryor, 3
a. A general name for a pond or tank with a bottom or bed used for
filtering purposes. CTD
b. A pond or tank having a false bottom covered with sand, and serving to
filter river or pond water.
c. A fill of previous soil that provides a site for a septic field.
Nichols, 1
a. The compacted solid or semisolid material separated from a liquid and
remaining on a filter after pressure filtration. Inst. Petrol.
b. The layer of concentrated solids from the drilling mud left behind on
the walls of a borehole, or on a filter paper in filtration tests on mud.
Inst. Petrol.
The physical properties of a cake as measured by toughness, slickness, and
brittleness. Brantly, 1
The fabric used as a medium for filtration; e.g., nylon cloth, blanket
cloth, finely woven wire mesh, or finely woven glass thread.
Syn:press cloth
Light that has passed through a colored-glass filter, absorbing some hues
and permitting others to pass through.
A tank containing the pulp to be filtered, generally fitted with an
agitator to maintain the solids in the pulp in suspension, and in which
the drum or disk of a rotary vacuum filter is partially immersed.
BS, 5
Any porous stone, such as sandstone, through which water is filtered.
The amount of fluid delivered through a permeable membrane in a specified
time. Brantly, 1
A form of pressure filter, noncontinuous in operation; used in coal
preparation for the removal of water from slurries, tailings, and similar
products. BS, 5
A process of magmatic differentiation wherein a magma, having crystallized
to a mush of interlocking crystals in liquid, is compressed by Earth
movements and the liquid moves toward regions of lower pressure, thus
becoming separated from the crystals. Syn:filtration differentiation
AGI
An aspirator for hastening the process of filtering by creating a partial
vacuum. Standard, 2
Short glass tube with filtering septum; used in laboratory sampling.
Pryor, 3
A protective device that removes dispersoids from the air by physically
trapping the particles on the fibrous material of the filter. It offers no
protection against gases or vapors, or atmospheres deficient in oxygen.
Many workers, however, are subjected to dusts, fumes, and mists in
sufficient quantity to impair their health. Common examples are the dusts
of cement, coal, flour, limestone, silica, and asbestos encountered in
mining, grinding, and crushing operations; the metallic fumes of welding,
smelting, and refining processes; and the mists formed by the
disintegration of a liquid in such work as spray-coating, atomizing, and
chromium-plating. Best, 1
The liquid product from the filtration process. BS, 5
Removal of suspended and/or colloidal material from a liquid by passing
the suspension through a relatively fine porous medium, e.g., a canvas or
other fabric diaphragm; the process is activated by suction or pressure,
and commonly includes filter aids. The products are clear liquid and a
filter cake. AGI
See:filter pressing
The measure of the amount of filtrate passing through or into a porous
medium. Filter loss and cake thickness constitute the determining factors
of filtration qualities.
Som. A local term for combustible gases. Fay