Eng.; Scot. Ore sludge; ore slime. A variation of smeddum.
A rotary kiln providing an alternative method to sintering for the
treatment of fine ores and flue dust. Osborne
A small, open-hearth furnace utilizing an air blast with coal or coke for
fuel. It is commonly used for heating small metal parts previous to
manual, hot-working operations. Henderson
A monoclinic mineral, AgAsS2 ; dimorphous with trechmannite; red.
a. A variation of the series system of copper refining in which the plates
are placed horizontally, the top surface of each one acting as cathode,
the lower as anode. Linen diaphragms must be placed between the plates to
catch the slime. When these diaphragms break and allow the slime to drop
on the cathode, it is difficult to remedy any short circuits without
dismantling the tank. Liddell
b. A process for sponge iron production that is carried out in vertical
ovens or retorts, similar to coke ovens in design. Crushed ore or iron
oxide material is mixed with carbonaceous material and charged into the
oven, where it is heated and cooled by means of horizontal flues. It is
preheated in the upper part of the oven by the waste gases; then the
charge enters the reduction zone, and is subsequently cooled by the
incoming air for combustion in the heating flues. Osborne
a. A white to yellow, or to brown and rarely green or blue variety of zinc
carbonate. See also:zinc carbonate
b. A trigonal mineral, ZnCO3 , with Zn replaced by Fe; of the
calcite group; rhombohedral cleavage; varicolored; commonly reniform,
botryoidal, stalactitic, or granular; commonly altered from sphalerite in
oxidized zones of limestone replacement; a source of zinc; distinguished
from hemimorphite by its effervescence in acids. Syn:dry-bone ore;
calamine; zinc spar; szaskaite.
c. A term sometimes used as a syn. of hemimorphite.
Fine gravellike ore, occurring free in mud openings, or derived from the
breaking of the ore in blasting. A variation of smeddum.
The exhalation, visible vapor, or material that escapes or is expelled
from a burning substance during combustion; applied esp. to the volatile
matter expelled from wood, coal, peat, etc. together with the solid matter
that is carried off in suspension with it. That which is expelled from
metallic substances is generally called fume or fumes. See also:fume;
metallurgical smoke.
Nitrocellulose containing 13.1% nitrogen. Produced by blending material of
somewhat lower (12.6%) and slightly higher (13.2%) nitrogen content;
converting to a dough with an alcohol-ether mixture; extruding; cutting;
and drying to a hard, horny product. Small amounts of stabilizers (amines)
and plasticizers are usually present, as well as various modifying agents
(nitrotoluene and nitroglycerin salts). CCD, 2
A means of making a smoke cloud to measure the velocity of air. Fuming
sulfuric acid or anhydrous tin tetrachloride are favorite smoke producers.
Zern
See:cairngorm; smoky quartz.
A technique used to measure only very low-speed air velocity. The release
of smoke enables the fluid motion to be observed with the eye. If the
smoke is timed over a measured distance along an airway of constant cross
section then the velocity of flow can be determined. Usually a spot
reading, that of maximum velocity, is obtained. Roberts, 1
One who tests the efficiency of the Cottrell plant and flue recovery
method by determining the rate of discharge of gases and solids from the
smelter smokestack. DOT
To determine the presence of moving air, the direction of flow, and the
approximate velocity of flow, the smoke tube method is commonly used,
particularly in metal mines. The device consists of an aspirator bulb,
which discharges air through a glass tube containing a smoke-generating
reagent. Usually pumice stone saturated with anhydrous tin or titanium
tetrachloride is employed. The dense white cloud of smoke released when
the bulb is squeezed travels with the air current; the approximate air
velocity in a mine airway is determined by timing how long the cloud takes
to travel between two points. Hartman, 2
A device in which smoke is forced upward against a downward spray of water
in order to remove the solid particles in the smoke. Webster 3rd
The area surrounding a smelting plant in which the smoke or fumes damage
vegetation, or in which it may be classed as a public menace or nuisance.
Fay
A light to very dark brown variety of quartz sometimes used as a
semiprecious gemstone. Syn:cairngorm; smokestone.
A trade name for smoky quartz used for jewelry.
A technique used in surface and underground blasting in which a row or
closely spaced drill holes are loaded with decoupled charges (charges with
a smaller diameter than the drill hole) and fired simultaneously to
produce an excavation contour without fracturing or damaging the rock
behind or adjacent to the blasted face. See also:controlled blasting
A rock formation in which a high recovery of core can be attained at a
high rate of penetration. Long
A drag that breaks up lumps behind a leveling machine. Nichols, 1