- 업종: 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 coal cutter operated by an electric motor; used in coal mines.
Industry:Mining
A coal cutter that cuts a groove in the coal by an endless chain traveling around a flat plate called a jib. The chain consists of a number of pick boxes. Each box holds a cutter pick fastened into the box by a set screw or similar device. The coal cutter pulls itself along the face by means of a rope at a speed ranging from 7 in/min (17.8 cm/min) to 5 ft/min (1.5 m/min) or more. The chain travels around the jib at a speed ranging from 320 to 650 ft/min (97.6 to 198.2 m/min). The cut in the coal ranges from 3-1/2 to 7-1/2 in (8.9 to 19.1 cm) high and up to 8-1/2 ft (2.59 m) in length.
Industry:Mining
A coal cutter whose cutting unit consists of a disk or wheel, armed at its periphery with cutters. The first disk machine, with detachable picks, was patented in 1861. The disk coal cutter is obsolescent.
Industry:Mining
A coal cutter with a jib capable of cutting at any height or angle. It may be mounted on crawler tracks.
Industry:Mining
A coal dryer that depends on a mass of particles being fluidized by passing a stream of hot air through it. As a result of the fluidization, intense turbulence is created in the mass, including a rapid drying action. The dry coal is withdrawn from the opposite side of the chamber. Fine particles in the feed become entrained in the air and are recovered in a cyclone, while the finest particles may need removal by dry filters or wet scrubbers. The dryer has a high capacity and many are in use in the United States.
Industry:Mining
A coal face mined by remotely controlled equipment that eliminates the need for workers in dangerous places.
Industry:Mining
A coal lithotype characterized macroscopically by semibright, silky luster and sheetlike, irregular fracture. It is distinguished from vitrain by containing fine intercalations of a duller lithotype, durain. Its characteristic microlithotype is clarite. Compare: clarite; fusain; vitrain.
Industry:Mining
