Former name for iron selenide, FeSe .
Artificial graphite made from coke by electric furnace heating.
Bennett
A process for the production of artificial or synthetic graphite. It
consists of sintering pulverized coke in the Acheson furnace at 2,760 to
3,316 degrees C. Henderson
Former name for dioptase.
A colorless variety of elbaite tourmaline used as a gemstone.
In microscopy, a compound lens that does not spread white light into its
spectral colors. CF:aberration
a. A mineral consisting of fine needlelike crystals; e.g., natrolite.
Nelson
b. Slender needlelike crystal.
c. Refers to needlelike crystals. CF:equant; sagenitic; tabular;
rodlike.
See:aikinite
In powder metallurgy, needle-shaped particles. ASM, 1
See:aikinite
a. A solution of pH less than 7.0 at 25 degrees C.
b. A substance containing hydrogen that may be replaced by metals with the
formation of salts. CTD
One lined with acid refractories.
The inner bottom and lining of a melting furnace, consisting of materials
like sand, siliceous rock, or silica brick, which give an acid reaction at
the operating temperature. Syn:acid lining
a. A clay that is used mainly as a decolorant or refining agent, and
sometimes as a desulfurizer, coagulant, or catalyst.
b. A clay that yields hydrogen ions in a water suspension; a hydrogen
clay.
In uranium extraction, sulfation of moist ore before leaching.
Pryor, 1
A method of determining the angular inclination of a borehole in which a
glass, test-tubelike bottle partly filled with a dilute solution of
hydrofluoric acid is inserted in a watertight metal case. When the
assemblage is lowered into a borehole and left for 20 to 30 min, the acid
etches the bottle at a level plane from which the inclination of the
borehole can be measured. CF:Kiruna method
acid test; acid-etch tube. Long
See:acid-dip survey
Water with a pH of less than 6.0 and in which total acidity exceeds total
alkalinity; discharged from an active, inactive, or abandoned surface coal
mine and reclamation operation.
An arc furnace having an acid refractory hearth.
A form of hydrogen embrittlement that may be induced in some metals by
acid treatment. ASM, 1
A soda-lime glass tube charged with dilute hydrofluoric acid, left in a
borehole for 20 to 30 min to measure inclination as indicated by the angle
of etch line on the tube. May be fitted in a clinometer.
Syn:acid-etch vial; culture tube; etch tube; sargent tube.
See also:acid-dip survey