- 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 ...
Wire rope in which the strands are bent to their correct lay before being laid up, so that the rope is unlikely to spin or kink.
Industry:Mining
Wire strand construction having one size of wires for the outer layer with the same number of smaller wires in the underlayer. Both layers have the same length and direction of lay.
Industry:Mining
Wire used to extend the firing line or leg wires in an electric blasting circuit.
Industry:Mining
Wire-mesh screens that are vibrated and heated electrically to increase efficiency.
Industry:Mining
Wires suspended in a dust chamber to assist in settling and condensing dust and fumes from furnace gases.
Industry:Mining
With a view to applying the coal plow to seams too hard to be sheared by the normal cutting blade, German mining engineers have developed various types of power-operated cutters. One consists of a series of compressed-air picks mounted above each other; another, of a resonance pattern, houses two high-speed motors eccentrically mounted and rotating in opposite directions. The latter imparts a vibration to the cutting edge equivalent to 2,500 blows per minute with a stroke of 3/16 to 1/4 in (4.8 to 6.4 mm) and a force of approx. 200 st (181 t).
Industry:Mining
With modern drilling equipment, it is now possible, in suitable conditions, to drill smalldiameter holes from top to bottom of the face, and where this can be done considerable advantages as to cost and efficiency can be obtained as compared with the bench method. In high faces of 50 ft (15 m) and upward it is not always easy to drill vertical holes to give small burdens because of the breakback of the rock at the crest of the quarry face. It is therefore recommended that larger burdens be taken and that the vertical holes be supplemented by breast holes at quarry floor level. These holes are intended to permit concentrated explosive charges to blow out the toe rock, while the explosive in the vertical holes brings down the rock from the face.
Industry:Mining
With reference to a compound or a phase, pertaining to the exact proportions of its constituents specified by its chemical formula. It is generally implied that a stoichiometric phase does not deviate measurably from its ideal composition.
Industry:Mining
With reference to a crusher, mean size of feed/mean size of product.
Industry:Mining
