- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A bit, the crown of which is formed by applying heat and pressure to a mixture of powdered metals covering diamonds set inside a mold or die-shaped to the form of a bit crown. The bit crown thus formed may be a surface-set, multilayer, or impregnated type.
Industry:Mining
A bit-crown design, in which the radius of the arc forming the rounded portion of the bit face is equal to or greater than the thickness of the bit wall.
Industry:Mining
A bit-crown diamond-embedment metal or alloy produced by a sinter powder-metal process.
Industry:Mining
A bituminous coal that burns freely without softening or any appearance of incipient fusion. The percentage of volatile matter may be the same as for coking coal, but the residue is not a true coke.
Industry:Mining
A bituminous pavement that is mixed and laid at relatively high temperatures, generally above 250 degrees F (121 degrees C). The highest type pavement that can be laid, it has greater durability and lower maintenance than any other type.
Industry:Mining
A bituminous stone resembling a fragrant gum resin in color and odor. It was a precious stone in ancient Arabia and Egypt.
Industry:Mining
A bituminous substance found in masses in the brown coal of Zweifelsruth, Bohemia, former Czechoslovakia. That part of this substance that is soluble in alcohol is termed rochlederite, the residue melanellite. Also spelled melanchym.
Industry:Mining
A black liquid, made from a bituminous ore, used for the protection of steel surfaces during transport and storage. This fluid dries rapidly to a hard gloss, which is resistant to acids, alkalies, moisture, sea air, and temperatures up to 200 degrees C.
Industry:Mining
A black lubricating oil of 540 degrees F (282 degrees C) fire test, used as a heavy tempering oil and for waterproofing cement.
Industry:Mining
