a. The separation of different particles by centrifugal action as used in
cyclone separators and centrifuges.
b. The use of centrifugal force to increase the apparent density of finely
divided particles so as to accelerate their movement with respect to
ambient fluid. Pryor, 3
c. Accelerated settlement of finely divided particles from pulp, removal
of moisture, or classification into relatively coarse and fine fractions
by centrifuging. Performed on a laboratory scale in small batches and
commercially in a hydrocyclone or centrifugal classifier.
See also:cyclone; cyclone washer. Pryor, 3
A mine ventilation system in which the air is led through a shaft in the
middle of the field into the mine and out again at the periphery of the
mining field. Stoces
a. A centrifugal device for dewatering, usually conical or bowl-shaped, in
which the containing surface is imperforated. The greater density of the
solid particles causes them to collect preferentially in contact with the
inside of the containing surface where they are discharged mechanically;
the water usually overflows from a position nearer to the axis.
BS, 5
b. A rotating device for separating liquids of different specific
gravities or for separating suspended colloidal particles, such as clay
particles in an aqueous suspension, according to particle-size fractions,
by centrifugal force. Colloidal particles that cannot be deposited from
suspension by gravity can be deposited by centrifugal force in a
supercentrifuge. See also:cyclone
Dewatering of clean coal or refuse with the aid of centrifugal force.
See also:centrifugal separation
Drainage more or less radially inward toward a center. Stokes
A pump with a rotating mechanism that gathers a fluid at or near the
circumference of radial tubes and discharges it at the axis.
Standard, 2
Mineral replacement in which the host mineral is replaced from its
periphery inward. CF:centrifugal replacement
Said of strata and structures that dip toward a common center. Ant:
quaquaversal. CF:periclinal
0 [· ¿¹ _ƒÌ DICTIONARY TERMS:centrocline An equidimensional basin characteristic
[\B]centrocline[\N]
See:barysphere; core of the Earth.
Having a center of symmetry. Centrosymmetric crystal structures cannot
exhibit pyroelectricity or piezoelectricity.
Substance formed of a mixture of metal and ceramic, to give the requisite
conductivity to the latter. CTD
a. As a singular or plural noun, any of a class of inorganic, nonmetallic
products that are subjected to a high temperature during manufacture or
use. ACSG, 2
b. As an adj., of or pertaining to (1) ceramic--that is, inorganic or
nonmetallic as opposed to organic or metallic; (2) products manufactured
from inorganic nonmetallic substances, which are subjected to a high
temperature during manufacture or use; (3) the manufacture or use of such
articles or materials, such as ceramic process or ceramic science.
ACSG, 2
See:pyrometric cone
A former name for chlorargyrite, AgCl. Also spelled kerargyrite.
Borosilicate of calcium, beryllium, iron, thorium, and rare earths.
Hey, 1
An isometric mineral (Ce,Th)O2 ; forms minute greenish-yellow
grains; named for its relationship to thorianite and uraninite.
A trigonal mineral, (Ce,Ca)10 (SiO4 )6 (OH,F)5;
generally brown, massive.
One of the most abundant of the rare earth metals. Symbol, Ce. The
minerals monazite and bastnasite are presently its two most important
sources. It is used in the manufacture of pyrophoric alloy. The oxide is a
constituent of incandescent gas mantles and is emerging as a catalyst in
self-cleaning ovens. The sulfate is used as an oxidizing agent in
quantitative analysis. Other cerium compounds are used in the manufacture
of glass, as a polishing agent, and in carbon-arc lighting, petroleum
refining, and metallurgical and nuclear applications.
Handbook of Chemistry and Physics, 3
A material or body consisting of ceramic particles bonded with a metal.
According to the American Society for Testing and Materials, the ceramic
phase must be present in 15% or more of the body. A ceramic foam or porous
ceramic is not a cermet because the bonding of the ceramic structure is
not dependent on or due to the metal. Hunt
See:kerolite
A term used in the Southwestern United States for a hill, esp. a craggy or
rocky eminence of moderate height. Etymol: Spanish. AGI