- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
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 bunch-blasting method in which 6 to 15 fuses, cut to respective lengths 2 in (5.1 cm) longer than required, are tied together near one end by two ravelings of fuse spaced about 120 5 to 6 in (12.7 to 15.2 cm) apart. A special cutter cuts the fuses off evenly between the two ties, leaving the fuses tied together and offering a smooth face of cut ends. Another bunch is made from the fuses of the remaining holes in the round. By using a short notched fuse as a spitter, the flame is directed against the cut end of one bunch of fuses. As soon as this bunch ignites, it is held close to the face of the second bunch, moving slowly to contact all fuses with the flame from the first bunch. Bunches should be held at least 6 in back from the end to avoid burning the hands. By this method, all the holes of a round are fired in only two groups and by one spitter.
Industry:Mining
A buoyant pump suction end that draws its water from near the surface of the free-water level and thus pumping almost clear water. Serves to decant. A floating strainer may be used in dealing with bodies of water other than in properly constructed sumps.
Industry:Mining
A buoyed wire towed by a ship at a given depth to determine whether any isolated rocks, small shoals, etc., extend above that depth, or for determining the least depth of an area.
Industry:Mining
A burned magnesite brick, containing 90% or more of magnesia, and 1.5% to 2.5% iron oxide.
Industry:Mining
A burning mixture of a combustible gas (or vapor) and air. Solid fuels burn with a glow, but with little flame. Flames are normally hot, but under some conditions are relatively cool. Principal types of flame are luminous, nonluminous, long (lazy) flames, and short flames.
Industry:Mining
A butterfly valve opening from the cold-blast main of a blast furnace to the atmosphere. It allows casting at the furnace without shutting down the blowing engines; operated by large wheel or lever in the cast house.
Industry:Mining
A butyraceous, greenish-yellow to wax-yellow hydrocarbon from Wettin, Saxony, Germany. It has a specific gravity of less than 1 and is soft at 55 to 60 degrees C.
Industry:Mining
