A cast iron that has been treated while molten with a master alloy
containing an element, such as magnesium or cerium, to produce primary
graphite in the spherulitic form. See also:iron
a. A small, irregularly rounded knot, mass, or lump of a mineral or
mineral aggregate, normally having a warty or knobby surface and no
internal structure, and usually exhibiting a contrasting composition from
the enclosing sediment or rock; e.g., a nodule of pyrite in a coalbed, a
chert nodule in limestone, or a phosphatic nodule in marine strata.
Nodules can be separated as discrete masses from the host material.
AGI
b. One of the widely scattered concretionary lumps of manganese, cobalt,
iron, and nickel found on the floors of the world's oceans; esp. a
manganese nodule. Etymol: Latin nodulus, small knot. CF:concretion
AGI
c. A rounded material accretion built of successive layers, of easily
handled size. Pryor, 3
d. A small, rounded, irregularly shaped mass, as those of graphite in
malleable cast iron. Rolfe
a. The forming of rounded shapes by the application to fine coal of a
gyratory, rotary, or oscillatory motion, without the use of pressure.
BS, 5
b. See:balling
a. Any undesired sound. NCB
b. By extension, any unwanted disturbance such as undesired electric waves
in any transmission channel or device. NCB
c. In gravity and magnetic prospecting, disturbances in observed data due
to more or less random inhomogeneities in surface and near-surface
material. AGI
d. In seismic prospecting, all recorded energy not derived from the
explosion of the shot. Sometimes loosely used for all recorded energy
except events of interest. AGI
In observed or recorded data, the fluctuations not attributable to
signals. AGI
A measure of a hearing protector's effectiveness in reducing noise such as
results from mining operations where drilling, cutting, blasting, etc.
create high noise levels. Abbrev. NRR. MSHA, 2
A hexagonal mineral, (V,Fe,Ti)10 O14 (OH)2 ; rare;
forms tabular prisms and plates; associated with uranium ores at
Beaverlodge, SK, Canda, and with native gold and various tellurides at
Kalgoorlie, Western Australia.
Of a screen, the total area of the screen deck exposed to the flow of the
material feed. BS, 5
In a filter, the difference between the nominal upper and lower cutoff
frequencies. This difference may be expressed in cycles per second, as a
percentage of the pass-band center frequency, or as the difference between
the upper and lower cutoffs in octaves. Hy
A notional figure expressed in tons per hour used in the title of a
flowsheet and in general descriptions of the plant, applying to the plant
as a whole and to the specific project under consideration. It may be
taken as representing the approximate tonnage expected to be supplied to
the plant during the hour of greatest load. BS, 5
An estimate of the price for a future month date which is used to
designate a closing price when no trading has taken place in that date.
Also used for current price indications in similar circumstances in
physical trading. Wolff
a. A nominal mesh aperture used to designate the result of a screening
operation. BS, 5
b. A notional size at which it is intended to divide a feed by a screening
operation. Syn:nominal screen size
The limit or limits of particle size used to describe a product of a
sizing operation. BS, 5
A type of line chart that graphically represents an equation of three
variables, each of which is represented by a graduated straight line. It
is used to avoid lengthy calculations; a straight line connecting values
on two of the lines automatically intersects the third line at the
required value. Syn:nomograph
See:nomogram
See:disconformity
Any of several species of pyrobitumens, including dark-colored,
comparatively hard and nonvolatile solids, composed of hydrocarbons
containing oxygenated bodies, infusible and largely insoluble in carbon
disulfide. This includes peat, coal, and nonasphaltic pyrobitumen shales.
Tomkeieff
Coal that does not display a striated or banded appearance on the vertical
face. It contains essentially no vitrain and consists of clarain or
durain, or of material intermediate between the two. AGI
Ore containing up to about 0.18% phosphorus. Newton, 1