A circular pit in which a large wheel is revolved for tempering clay.
Fay
A type of crusher in which high-speed rolls act on the inside
circumference of a vertical cylinder to powder raw material like clay.
Enam. Dict.
A sturdily built grizzly for handling large pieces of ore. This type
transports its material across a series of grooved rollers moved
mechanically, or alternatively by the sliding ore. Undersize falls through
the grooves. Pryor, 3
A press consisting of rolls of unequal diameter, revolving one within the
other and in the same direction. BS, 5
A recorder that gives a continuous record in the range of 0% to 3%.
Roberts, 1
A small instrument that is capable of estimating methane in the range of
0% to 2% . Roberts, 1
In some areas altered rock has been found as a halo over an orebody and
thus serves as a geologic target for guiding prospecting operations. The
ratio between the size of the ring and the orebody must not be too large
for practical purposes. Such target rings are not always obvious and will
only be recognized after much painstaking work and study. Also called
bulls-eye alteration patterns. Lewis
a. A voussoir showing on the face of the wall. Webster 3rd
b. Eng. Large oolitic grains in very hard crystalline matrix, above the
slates at Collyweston, U.K. CF:sun bed
The zone of stress, higher than that pre-existing in the rock, which
surrounds all development excavations is called the ring stress.
Spalding
In stoping, the ring stresses around a level, rise, or winze are so
increased by the influence of an approaching stope face that at some point
on the periphery the rock fails. The stress ring is broken, and the rock
of sides, back, and bottom released thereby expands suddenly and violently
into the excavation, causing a rock burst. This rock burst is identical in
type with those occurring in development. It is usually extremely local in
effect, though a heavy earth tremor is caused. Spalding
Tension that develops in the wall of a circular tank containing liquid or
solid material. Hammond
In drilling, a reaming shell, the inset reaming diamonds of which are set
into a cast- or powder-metal band encircling the outside surface of the
shell. Long
A drill-hole deflecting wedge having a short metal sleeve attached to the
uppermost end. The outside diameter of the sleeve is the same as that of
the lower, full-circle part of the wedge. Long
The inner firebrick wall of a blast furnace. Standard, 2
A monoclinic mineral, (Na,Ca,Ce)3 Ti(Si2 O7 )2
OF3 ; weakly radioactive; forms prismatic crystals in veins
containing silicates of cerium metals, yttrium, and niobium; near
Barkevik, Norway, in sodalite syenite in the Julianehaab district,
Greenland, and in large crystals on the Kola Peninsula, Russia. Also
spelled rinkolite. Syn:johnstrupite
A Swedish standard scale for the estimation of slag inclusions in iron and
steel. This scale consists of a series of micrographs, designed to show
different typical fields of view, and arranged in groups according to the
form and distribution of the inclusions and numbered according to their
quantity. Osborne
A trigonal mineral, K3 NaFeCl6 ; colorless to varicolored;
becomes brown on exposure to air and has an astringent taste.
In the ion-exchange (IX) cycle, applied to pregnant leach liquors, the
displacement wash used after the absorption cycle, which moves pregnant
liquor still in the column onto the next absorption column in the series.
Term also applied to water rinse used after elution cycle, and before acid
rinse. Pryor, 3
a. Water used to remove fine particles from larger sizes, usually located
over vibrating screens. BS, 5
b. Syn:spray water
Heap leaching of cupriferous sulfides after their slow oxidation to
sulfates on prolonged atmospheric weathering. Pryor, 3
a. To bring down rock in a roadway to increase headroom. See also:dint
Fraenkel
b. See:brush