- المجال: 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 machine in which size reduction is effected by elements rigidly fixed to a rotating horizontal shaft mounted in a surrounding casing.
Industry:Mining
A machine in which the coal is hewed from the solid by 10 rotating chipping heads in 2 rows of 5, each with the lower row in advance of the upper. Each head consists of a bit supplemented by widely spaced teeth, each tooth being stepped back to the outside of the head. The circular kerfs made by the heads overlap, and as the machine moves forward, the effect is to break the coal ahead of the teeth into the free spaces, thereby minimizing the production of fines.
Industry:Mining
A machine in which the feed is stratified by means of pulsating currents of air and from which the stratified products are separately removed.
Industry:Mining
A machine in which the sludge (slime) from another mill is washed; as, e.g., a slime table.
Industry:Mining
A machine or appliance used in shifting a railway track laterally. Also the operator of such a device or machine.
Industry:Mining
A machine or blower having either pistons, cams, or fans for furnishing an airblast above atmospheric pressure.
Industry:Mining
A machine or establishment for pulverizing quartz ore, in order that the gold or silver it contains may be separated by chemical means; a stamp mill.
Industry:Mining
A machine possessing rotating air-moving blades to exhaust or push the air volume necessary to ventilate mine workings.
Industry:Mining
A machine powered by compressed air or electricity that drives a cutting chain or other device so as to undercut or overcut a seam, or to remove a layer of shale. Percussive cutters are used to bore holes or to make vertical cuts (nicking, shearing); disk, bar, and chain cutters carry small picks that undercut the seam as the machine travels.
Industry:Mining
A machine similar to a dredger used for excavating cuttings for roads, railways, or canals. One large machine of this type can dig 100 yd/h (91.4 m/h) on a slope 25 ft (7.62 m) high.
Industry:Mining
