A tapered cylinder, generally of wood, placed in a borehole and into which
a deflection drive wedge may be driven in a random or oriented position.
Syn:deflecting plug; deflection plug. Long
There is a minimal market price for each metal below which it cannot fall
without putting the average producer out of business; this price has been
called the base price. Hoover
a. As used by some drillers, the solid rock immediately underlying the
overburden material. Long
b. As used by drillers in the Midwestern United States, the igneous rock
formations underlying the sedimentary rocks. Also called basement;
basement rock; pavement. Long
An observation point used in geophysical surveys as a reference, to which
measurements at additional points can be compared. AGI
a. Said of an igneous rock having a relatively low silica content,
sometimes delimited arbitrarily as 44% to 51% or 45% to 52% ; e.g.,
gabbro, basalt. Basic rocks are relatively rich in iron, magnesium, and/or
calcium, and thus include most mafic rocks as well as other rocks. Basic
is one of four subdivisions of a widely used system for classifying
igneous rocks based on their silica content: acidic, intermediate, basic,
and ultrabasic. CF:femic
b. Said loosely of dark-colored minerals. CF:silicic; mafic.
AGI
c. Said of a plagioclase that is calcic.
The inner bottom and lining of a melting furnace consisting of materials
like crushed burnt dolomite, magnesite, magnesite bricks, or basic slag,
that give a basic reaction at the operating temperature. ASM, 1
A diagram of the various stages in the treatment of the raw coal in a
preparation plant, usually either a process flowsheet or an equipment
flowsheet. BS, 5
In granitization, an advancing zone enriched in calcium, magnesium, and
iron, that is said to represent those elements in the rock being
granitized that are in excess of those required to form granite. During
granitization, these elements are believed to be displaced and moved
through the rock ahead of the granitization front, to form a zone enriched
in minerals such as hornblende and pyroxene. Syn:mafic front;
magnesium front. AGI
Used to define steel produced by the basic open-hearth process.
Hammond
Lava poor in silica, generally less than 52% total SiO2 ; typically
dark and heavy, as basalt.
A lining for furnaces, converters, etc., formed of nonsiliceous material,
usually limestone, dolomite, lime, magnesia, or ferrous oxide. Fay
An improvement of the Bessemer process in which, by the use of a basic
lining in the converter and by the addition of basic materials during the
blow, it is possible to eliminate phosphorus from the pig iron and keep it
out of the steel. Fay
A steelmaking process in which oxygen is forced at supersonic speed
through a retractable water-cooled lance, accelerating the burning off of
unwanted elements in a charge of molten iron and scrap.
Encyclopaedia Britannica
a. As used by the drilling and mining industries, a guaranteed price to be
paid for a specific quantity of materials, or type of service.
Long
b. As applied to the price of metals, it is that figure at which the price
is a minimum. See also:normal price
A steelmaking process, either Bessemer, open-hearth, or electric, in which
the furnace is lined with a basic refractory, a slag rich in lime being
formed and phosphorus removed. See also:acid process;
dephosphorization. CTD
Refractories that consist essentially of magnesia, lime, chrome ore, or
forsterite, or mixtures of two or more of these. Harbison-Walker
A furnace lining, composed of material low in acidic minerals, such as
silica, and high in basic minerals, such as lime, chromite, dolomite,
magnesite, and magnesia.
Slag rich in bases, such as metallic oxides; specif., slag rich in lime,
made during the basic Bessemer or basic open-hearth steel processes, and,
from the quantity of phosphorus contained in it, valuable as an artificial
fertilizer. Standard, 2
One that accepts protons from solute. Pryor, 3
Steel melted in a furnace with a basic bottom and lining and under a slag
containing an excess of a basic substance, such as magnesia or lime.
ASM, 1
a. A natural depression of strata containing a coalbed or other stratified
deposit. CF:depression
b. The lowest part of a mine or area of coal lands. Hudson
c. A general region with an overall history of subsidence and thick
sedimentary section. Wheeler, R.R.