Diameter of cylindrical section of hydrocyclone. Also diameter of inlet
orifice if round. Dimensions or area in given inches or square inches if
opening is rectangular. Pryor, 3
A coarser sized fraction, which leaves via apex aperture of hydrocyclone.
Pryor, 3
Cyclone washing of small coal originates from the Netherlands. Clean
separation is effected with the aid of centrifugal force. The heavier
shale particles move to the wall of the cyclone and are eventually
discharged at the bottom while the lighter coal particles are swept toward
the central vortex and are discharged through an outlet at the top. The
washer may be used for cleaning coal up to 3/4 in (1.9 cm). The coal is
normally deslimed at about 0.5 mm before cleaning. The separating medium
is water and ground magnetite, the bulk of which is recovered and returned
to the circuit. A 20-in (50.8-cm) cyclone has a feed capacity of about 50
t/h of coal sized between 1/2 in (12.7 mm) and 1/2 mm.
See also:centrifugal separation; cyclone. Nelson
Steel produced by blowing iron-ore powder into a hot gas. CTD
A series of beds deposited during a single sedimentary cycle of the type
that prevailed during the Pennsylvanian period. The cyclothem, which
ideally consists of 10 members (in western Illinois, the fifth member is a
coal layer), indicates an unstable coastal environment in which marine
submergence and emergence occurred. A cyclothem ranks as a formation in
the scale of stratigraphic nomenclature. Syn:coal-measures unit
A particle accelerator in which charged particles receive repeated
synchronized accelerations by electrical fields as the particles spiral
outward from their source. The particles are kept in the spiral by a
powerful magnet. Lyman
In cylinder cuts the blasting is performed toward an empty hole in such a
way that, as the charges in the first, second, and subsequent holes
detonate, the broken rock is thrown out of the cut. The opening is
successively and uniformly (cylindrically) enlarged in its entire length.
Langefors
See:parallel drum
Land having zero relief. ASM, 1
See:tube mill
A vertical structure in sandstone, a few centimeters to several decimeters
in diameter and several decimeters in length, with a structureless
interior, attributed to a rising water column or a spring channel.
Syn:sandstone pipe
A triclinic mineral, Pb4 FeSn4 Sb2 S16 ; forms
cylinders that separate under pressure into distinct shells or folia, or
is massive; at Poopo, Bolivia.
A combination of a cone and a cylinder. The ascending rope is wound on the
smaller diameter of the cone; as the engine reaches full speed after the
period of acceleration, the rope is wound on the larger cylindrical part.
For deep shafts the rope is wound back on itself for the last part of the
hoisting period, thus reducing the width of the drum.
See also:bicylindroconical drum
The splitting of a vein along its dip or strike into two branches, both of
which curve away from the general trend and then unite to resume a
direction parallel to but not in line with the original trend.
See also:cymoid structure
A vein, or a vein-shaped structure, shaped like a reverse curve.
See also:cymoid loop
See:cat's-eye; chrysoberyl.
A monoclinic mineral, BaAl2 Si2 (O,OH)8 .H2 O;
pseudohexagonal; at the Benalt manganese mine, Wales. Named from Cymru,
the Welsh name for Wales.
A variety of vesuvianite or idocrase, of a blue tint, which is supposedly
due to copper. Fay
A steel containing approx. 15% chromium and 9% copper; claimed to be
resistant to corrosion in the atmosphere and to tap water, but its
corrosion-resistant properties are inferior to the conventional austenitic
chromium-nickel steels of the 18-8 type. Osborne
A tetragonal mineral, NaFe3 (PO4 )2 (OH)4 .2H
2 O ; in pegmatite at Cyrilov, Moravia, Czech Republic.
A variety of zircon.