The motion of liquid through a membrane under the influence of an applied
electric field. See also:osmosis; thermo-osmosis. AGI
a. Movement of colloid particles toward an oppositely charged electrode
through a solution. Pryor, 3
b. The movement toward electrodes of suspended charged particles in a
fluid by applying an electromotive force to the electrodes that are in
contact with the suspension. See also:cataphoresis
To plate with an adherent continuous coating by electrodeposition; esp.,
to plate with a metal. Webster 3rd
Electrodepositing metal (may be an alloy) in an adherent form upon an
object serving as a cathode. ASM, 1
A method of lighting in which the well glass surrounding the bulb is
flushed out with compressed air through a special valve before a
self-contained generator commences to run; afterwards the exhaust from the
turbine is passed through the lamp fitting with a small back pressure of
1-1/2 to 2 psi (10.3 to 13.8 kPa), preventing ingress of methane. The
equipment can be used underground where the use of electricity is
prohibited and for both roadway and face lighting. Sinclair, 1
a. Positively charged; having more protons than electrons. An
electropositive ion is a cation. Pryor, 3
b. Term used to describe substances that tend to pass to the cathode in
electrolysis. Mersereau, 2
The process of anodically dissolving a metal from an impure anode and
depositing it in a purer state at the cathode. Lowenheim
Any of various instruments for detecting the presence of an electric
charge on a body, for determining whether the charge is positive or
negative, or for indicating and measuring the intensity of radiation by
means of the motion imparted to charged bodies (as strips of gold leaf)
suspended from a metal conductor within an insulated chamber.
Webster 3rd
Quantity of electricity needed to raise system one unit of potential.
Pryor, 3
electrostatic cleaning process
A method of cleaning small sizes of coal, namely, 0.1 to 2 mm, by passing
the material over a slowly rotating roller through a high-voltage
electrostatic field between the earthed roller and an adjacent wire. Coal
loses its charge very slowly and is carried further around by the roller
than the impurities, thus effecting separation with reasonable efficiency.
Nelson
The most efficient of the dust samplers, the electrostatic precipitator is
a medium-volume instrument. Air is drawn through a metal tube serving as a
collecting surface (the anode) in which a platinum wire mounted axially
acts as the ionizing and precipitating electrode (the cathode). A
potential of about 10,000 V direct current is maintained across the tube
and wire. The assembly mounting and collecting tube contains a small fan
to induce air flow. Hartman, 1
Science of electric charges captured by bodies that then acquire special
characteristics because of their retention of such charges. Electrostatic
bunching is particle cling during the laboratory screening of dry material
in which frictional electric charge is set up. Pryor, 3
A method of separating materials by dropping feed material between two
electrodes, positive and negative, rotating in opposite directions.
Nonrepelled materials drop in a vertical plane; susceptible materials are
deposited in a forward position somewhat removed from the vertical plane.
ASM, 1
A vessel fitted with positively and negatively charged conductors that may
be used for extracting dust from flue gas or for separating mineral dust
from gangues. Nelson
As applied to electric blasting caps, a measure of the detonator's ability
to withstand electrostatic discharges without exploding. Fraenkel
A trade name for a precise electronic surveying device that transmits a
radio-frequency signal to a responder unit, which in turn transmits the
signal back to the interrogator unit. The time lapse between original
transmission and receipt of return signal is measured and displayed in a
direct digital readout for eventual reduction to a precise linear
distance. It operates on the same principle as the tellurometer.
See also:tellurometer
An electrochemical process in which a metal dissolved within an
electrolyte is plated onto an electrode. Used to recover metals such as
cobalt, copper, gold, and nickel from solution in the leaching of ores,
concentrates, precipitates, matte, etc.
a. A part of the series isometric native gold-silver (Au-Ag); deep to pale
yellow; argentiferous gold containing more than 20% silver. Also spelled
elektrum. Syn:gold argentide
b. An ancient Greek name, now obsolete, for amber. Also spelled elektron.
An alloy of gold and silver; contains from 55% to 88% gold.
Pryor, 3
a. A substance that cannot be decomposed into other substances.
AGI
b. A substance all of whose atoms have the same atomic number. The first
definition was accepted until the discovery of radioactivity (1896), and
is still useful in a qualitative sense. It is no longer strictly correct,
because (1) the natural radioactive decay involves the decomposition of
one element into others, (2) one element may be converted into another by
bombardment with high-speed particles, and (3) an element can be separated
into its isotopes. The second definition is accurate, but has the
disadvantage that it has little relevance to ordinary chemical reactions
or to geologic processes. AGI
c. In crystallography, any point, line, or plane about which crystal
structure, crystal faces, or crystal symmetry, including translation, is
symmetrically arrayed. CF:operation
Applied to any particle that cannot be further subdivided.