Legal closure of a heap leaching operation. Depends on individual State
regulations, but includes requirements for physical stability and chemical
effluent requirements for metals and pH. A monitoring period is included.
Syn:heap closure
In scraper or truck loading, a term used to describe the volume of
material the scraper will hold when the material is heaped. Frequently,
sideboards are added to increase the heaped capacity. Heaped capacity will
exceed struck capacity by approx. one-third, depending upon the heaping
condition assumed. CF:struck capacity
A process used for the recovery of copper, uranium, and precious metals
from weathered low-grade ore. The crushed material is laid on a slightly
sloping, impervious pad and uniformly leached by the percolation of the
leach liquor trickling through the beds by gravity to ponds. The metals
are recovered by conventional methods from the solution.
Matte produced by heap roasting. Fay
Method used to remove soluble constituents remaining within a heap leach
pile after the metals concentration decreases to levels below economic
limits. Simple water rinsing, chemical, or biological techniques or
combinations thereof may be employed. Van Zyl
Removal of sulfur from pyritic ore by burning in heaps, perhaps with aid
of fuel. Pryor, 3
Method of reducing a large sample of ore to yield a representative sample.
A conical heap is made by shoveling the material accurately on to the apex
so that it runs down equally all around. The heap can then be flattened
somewhat by rubbing with a spade, and is shoveled into four equal heaps,
the same amount being taken from the base of the cone each time the worker
goes around. Of the four smaller heaps thus formed, two are discarded and
two retained. These may now be crushed to improve the ease of thorough
mixing, and are then formed into another cone in the same way as the
first. The process is repeated, with periodic size reduction of the
retained portions, until the required small sample has been produced.
Pryor, 3
The buildings and surface works around a colliery shaft. CTD
a. The bottom portion of certain furnaces, such as a blast furnace, air
furnace, and reverberatory furnace, in which molten metal is collected or
held. ASM, 1
b. The part of a furnace in which heat is developed for the purpose of
melting glass. CTD
c. A plate or table upon which cylinder glass is flattened.
Standard, 2
Fireclay brick for use in lining the hearth walls and bosh sections of a
blast furnace. ARI
Furnaces in which the charge rests on the hearth or kiln wall and is
heated by hot gases passing over it. Even though hearth furnaces such as
the multiple-hearth roasting furnace and rotary kilns operate on the same
basis as reverberatory furnaces, they bear little resemblance to them.
Newton, 1
A cast-iron plate serving as a sole for a refiner's furnace.
Standard, 2
A roasting process in which the ore or concentrate enters at the top of a
multiple hearth roaster and drops from hearth to hearth in succession
until it is discharged at the bottom. In the downward progress of the ore,
the sulfide particles are roasted as they come in contact with the heated
air. Newton, 1
Scot. A particular form of attachment joint between the bucket rod and the
foot rod of a pump.
a. One operation in a furnace not operating continuously.
Fay; Newton, 1
b. The energy a body possesses because of the motion of its molecules.
Jones, 2
c. Energy in transit from a higher temperature system to a lower
temperature system. The process ends in thermal equilibrium. AGI
d. The material heated, melted, etc., at one time; as, the foundry runs
three heats a day. Standard, 2
e. Form of energy generated or transferred by combustion, chemical
reaction, mechanical means, or passage of electricity, and measurable by
its thermal effects. Pryor, 3
a. In furnaces, heat engines, etc., the distribution of the known input of
energy (as heat); also, the method of determining, or the graphical or
tabular record of, such distribution.
b. In fluidization roasting, the thermodynamic calculation used to control
addition or removal of heat in order to maintain the desired temperature
in the reacting vessel. Pryor, 3
c. Equilibrium that exists on the average between the radiation received
by the Earth and its atmosphere from the Sun and that emitted by the Earth
and its atmosphere. That the equilibrium does exist in the mean is
demonstrated by the observed long-term constancy of the Earth's surface
temperature. On the average, regions of the Earth nearer the equator than
about 35 degrees latitude receive more energy from the Sun than they are
able to radiate, whereas latitudes higher than 35 degrees receive less.
The excess of heat is carried from low latitudes to higher latitudes by
atmospheric and oceanic circulations and is reradiated. AGI
That quantity of heat required to increase the temperature of a system by
1 degrees at constant pressure and volume. It is usually expressed in
calories per degree Celsius. Syn:thermal capacity
A stone that has been artificially heated to the proper temperature with
the intention of improving or completely altering its color. The induced
color is permanent in varieties, such as hyacinth, burnt amethyst, etc.;
less permanent in blue zircon. See also:fired stone
Syn:heat-treated stone; burnt stone. CF:stained stone
Energy in the form of heat. Standard, 2
A mechanism (as an external-combustion or an internal-combustion engine)
for converting heat energy into mechanical energy. Webster 3rd