In ore dressing, smelting, and refining, one who recovers magnesium
particles from dust-bearing gas, using shock-chilling condensers and other
dust-collecting apparatus. Also called dust operator. DOT
A lens for producing convergent light.
See:waste
A name given to sinter with lime additions. Nelson
An apparatus in which conditioning takes place. BS, 5
Those substances added to the pulp to selectively treat coal or waste
surfaces prior to flotation.
Stage of froth-flotation process in which the surfaces of the coal or
associated impurities present in a pulp are treated with appropriate
chemicals to influence their reaction when the pulp is aerated.
Pryor, 4
To circulate a higher-than-normal volume of drill fluid while slowly
rotating and lowering the drill string from a point a few feet above the
bottom to the bottom of the borehole to wash away obstructing materials
before resuming coring operations. Long
The quantity of heat transmitted per unit time from a unit of surface to
an opposite unit of surface of material under a unit temperature
differential between the surfaces. Strock, 2
a. Guides of rope or of rigid construction to guide the cages or skips in
the shaft. Mason
b. A relatively short length of pipe driven through the unconsolidated
zone of top soil as the first step in collaring a borehole. Also called
stand pipe. Long
c. See:brakeman
An electric locomotive having a cable on a reel and connected both with
the locomotive motor and the trolley wire in the entry, so that the
locomotive may be driven into an unwired room. Zern
a. An airway. Zern
b. Pipe or casing placed in a borehole. See also:casing; drivepipe.
Long
A flat or nearly horizontal hole drilled for blasting a thin piece in the
bottom of a level. Zern
a. A conical hill or mountain, as an alluvial cone or a volcanic cone.
b. A device used on top of blast furnaces to enable charge to be put in
without permitting gas to escape. Syn:bell
c. The conical part of a gas flame next to the orifice of the tip.
ASM, 1
d. The conical hill or conical mountain built by an active volcano.
Explosive volcanoes build their cones from debris, ranging in size from
dust to huge blocks, thrown out from the vent and have steep slopes
approaching or exceeding the angle of repose. Quieter volcanoes that pour
out lava have much gentler slopes. Hess
e. A three-sided pyramid made of unfired ceramic materials whose
composition is such that when heated at a controlled rate they will deform
and fuse at a known temperature. It is placed inside a kiln or furnace
with ceramic ware to indicate the temperature of the kiln and the fired
condition of the ware. See also:pyrometric cone
f. A solid with a circle for a base and with a convex surface that tapers
uniformly to a vertex. Jones, 1
g. Geometric pattern of the rock plug or stickup left in the bottom of a
borehole drilled by a concave bit. Long
h. Beveled coupling device on a small diamond drill or percussion rock
drill used to attach it to a drill column. Long
a. A cone-shaped hydraulic or free-settling classifier.
b. A conical sheet-steel vessel--usually a 60 degrees cone with its point
at the bottom--through which water, clear or weighted, flows upward. Ore,
coal, or other mineral matter is fed in at the top. The current carries
the smaller particles or those of lowest specific gravity over the rim
while the others settle. See also:Callow cone; Caldecott cone;
Allen cone; Menzies cone separator; Jeffrey-Robinson cone.
Syn:Chance cone; cone system.
A machine for reducing the size of materials by means of a truncated cone
revolving on its vertical axis within an outer chamber, the anular space
between the outer chamber and cone being tapered.
See also:gyratory breaker
A cut in which a number of central holes are drilled toward a focal point
and, when fired, break out a conical section of strata. BS, 12
See:concave bit
a. A secondary structure occurring in marls, limestones, ironstones,
coals, etc. It is a succession of small cones of approx. the same size one
within another and sharing a common axis. Holmes, 2
b. Coal exhibiting a peculiar fibrous structure passing into a singular
toothed arrangement of the particles is called cone-in-cone coal or
crystallized coal. Syn:crystallized coal
Upper Middle Pennsylvanian. AGI
The depression, approx. conical in shape, that is produced in a water
table or in the piezometric surface by pumping or artesian flow. The shape
of the depression is because of the fact that the water must flow through
progressively smaller cross sections as it nears the well, and hence the
hydraulic gradient must be steeper. See also:water table