- 行业: Mining
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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 ...
In this operation, the same personnel do the drilling, blasting, and mucking while working continuously round after round. They can in this way--except for the time for ventilation--be at work during the whole shift. Continuous driving is used when the advance per round is low and the mucking or the drilling and blasting do not need more than a part of the shift.
Industry:Mining
In this process, a mold, arranged for bottom feeding, is placed inside a vacuum bell; the bottom of the mold is connected by a tube to a ladle containing the molten metal, which is sucked into the mold cavity when a vacuum is formed.
Industry:Mining
In this process, a stream of fluid carries the material to be separated down a channel provided with draws for separating a heavy-gravity product and means for overflowing a lighter one. If properly constructed and operated, a comparatively solid bed of material will form on the bottom of the launder. Above this bed, a layer of particles will move along by the stream at a comparatively slow speed. Above this, successive layers will move with greater and greater velocity.
Industry:Mining
In this process, fluorspar, soda ash, carbon, lime, and mill scale were thrown on to the bottom of a hot ladle, and thus sintered. On tapping the steel from the open hearth furnace into the ladle, the resulting boil removed part of the phosphorus.
Industry:Mining
In this process, the feed coal is heated sufficiently to remove all the moisture from the coal and to mildly carbonize it. The carbonized hot coal, in a plastic state, flows to an extruder which agglomerates the product into pellets.
Industry:Mining
In this type driving, the drilling, loading, and blasting are carried out in one shift and the mucking and transportation in the following one. This enables every worker to specialize in his or her tasks and machines, which in a highly mechanized job is a necessary condition for making the best use of expensive equipment. It also reduces or eliminates the loss of time for ventilation; in rhythmic driving it is carried out between two shifts.
Industry:Mining
In this type log, provision is made for electrodes to be pressed firmly against the borehole wall. By doing this, current flowing from the electrodes to the wall of the borehole no longer has to traverse the mud. The path from the electrodes through the mud filter cake that sheaths permeable beds is also reduced to a mininium. The electrode spacing of contact logging devices is very small by comparison with the spacings used in conventional logging devices. Consequently, contact logging devices see very much more detail in the beds they pass through.
Industry:Mining
In this type of blasting, coal is blasted from the solid with no precutting or shearing.
Industry:Mining
In timbering, where both a cap and a sill are used, and posts act as dividers, the posts become the endplates. See: sideplate
Industry:Mining
In tin-plate manufacturing, a pot containing melted tin into which the plates are dipped to be coated.
Industry:Mining
