- 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 ...
Cyclone washing of small coal originates from the Netherlands. Clean separation is effected with the aid of centrifugal force. The heavier shale particles move to the wall of the cyclone and are eventually discharged at the bottom while the lighter coal particles are swept toward the central vortex and are discharged through an outlet at the top. The washer may be used for cleaning coal up to 3/4 in (1.9 cm). The coal is normally deslimed at about 0.5 mm before cleaning. The separating medium is water and ground magnetite, the bulk of which is recovered and returned to the circuit. A 20-in (50.8-cm) cyclone has a feed capacity of about 50 t/h of coal sized between 1/2 in (12.7 mm) and 1/2 mm.
Industry:Mining
One of the cutting points attached to a cutter chain for making a groove in a coal seam. The picks are made from quality carbon steel or a hard alloy steel and tipped with fused tungsten carbide, sintered tungsten carbide, or other hard-wearing material. The advent of the coal-cutter pick tipped with tungsten carbide on a heat-treated, alloy-steel shank has resulted in marked improvements in drilling and a reduction in cutting delays.
Industry:Mining
Organism capable of growth exclusively at the expense of inorganic nutrients.
Industry:Mining
Monoclinic and orthorhombic forms of chrysotile, as determined by X-rays.
Industry:Mining
One of the well-known drilling systems, sometimes designated as the American or rope system. The drilling is performed by a heavy string of tools suspended from a flexible 460 manila or steel cable to which a reciprocating motion is imparted by an oscillating "walking beam" through the suspension rope or cable.
Industry:Mining
Coke made by natural processes, usually by the intrusion of an igneous dike.
Industry:Mining
In a bank of homogeneous earth or clay, the slip surface of failure closely follows the arc of a circle that usually intersects the toe of the bank. Stability depends upon fixing the position of the center of rotation of the slip surface along which the greatest shearing resistance would be required for equilibrium.
Industry:Mining
