A process (no longer used) to smelt zinc in which roasted zinc ore is
mixed with a reducing material, such as coal or coke, placed in
cylindrical retorts, and heated in a furnace, such that the escaping zinc
vapor is condensed from the open end of the retort. Fay
A very hard, tough, more or less cellular quartzite resembling French
buhrstone and the most favored natural mill-lining material for most
purposes. It is imported in rectangular blocks that are more or less
shaped to fit the curve of a mill. AIME, 1
A furnace in which zinc is reduced and distilled from calcined ores in
tubular retorts. These furnaces may be classified as direct fired and gas
fired, but there is no sharp division between these systems, which merge
into one another by difficultly definable gradations. Each class of
furnace may be subdivided into recuperative and nonrecuperative, but heat
recuperation in connection with direct firing is rare.
See:willemite
a. A constituent of portland cement clinkers. English
b. A calcium orthosilicate found as a constituent of portland-cement
clinkers; specif. larnite. Syn:felite
Original spelling of belite. Hey, 1
Belknap chloride washer process
This coal washer uses a calcium chloride solution of a comparatively low
density and depends on mechanically induced upward currents to obtain a
separation at the desired specific gravity. It produces a clean, dustless,
nonfreezing coal. Mitchell
a. A cone-shaped mass of ironstone or other substance in the roof of a
coal seam. Bells are dangerous as they tend to collapse suddenly and
without warning. See also:pot bottom
b. A gong used as a signal at mine shafts.
c. See:cone
a. Eng. Dusty lead ore. Arkell
b. A form of lead poisoning to which miners are subject. Also spelled
belland; bellund.
See:bellan
See:cup and cone
A device used to drive an auxiliary shaker conveyor without changing the
direction of the main conveyor. It consists essentially of two driving
arms, placed at right angles to each other and supported at their pivot
point by a fulcrum jack. When these driving arms are attached to the main
and auxiliary conveyors, the reciprocating motion of the main conveyor is
transmitted to the auxiliary conveyor, which can then discharge its load
onto the main conveyor. Jones, 1
Eng. Widened; said of the enlarged portion of a shaft at the landing for
running the cars past the shaft, and for caging.
A conical cavity in a coal mine roof caused by the falling of a large
concretion; or, as of a bell mold.
Widenings in a vein. See also:belly
A triclinic mineral, Cu2 (IO3 )6 .2H2 O ;
forms light green or bluish green crystals; at Chuquicamata, Chile.
a. An explosive consisting of five parts of ammonium nitrate to one of
metadinitrobenzene, usually with some potassium nitrate. Fay
b. A lead chromo-arsenate in delicate velvety, red to orange tufts.
Webster 2nd
See:jar collar
Corn. An early name for tin pyrite (stannite), so called because of its
bronze color. See also:stannite
Som. A conical-shaped patch of a mine roof, probably originating with the
fossils called sigillaria, or the roots of trees. Syn:caldron
See also:bell; caldron bottom. Fay
a. An instrument with an air chamber and flexible sides used for
compressing and/or directing a current of air. Crispin
b. An expansible metal device containing a fluid that will volatilize at
some desired temperature, expand the device, and open or close an opening
or a switch; used in controls and steam traps. Strock, 2