- 行业: Mining
- Number of terms: 33118
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- 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 ...
Air compressed in volume and transmitted through pipes for use as motive power for underground machines. Compressed air is costly to transmit long distances, but has certain advantages, namely, it cools the air at the working face and is relatively safe in gassy mines.
Industry:Mining
Air compression carried out in two stages as is usual for pressures exceeding 60 psi (414 kPa) or for outputs greater than 100 hp (74.6 kW).
Industry:Mining
Air conditioning that controls the atmosphere that human beings breathe.
Industry:Mining
Air doors on a haulage road that are automatically operated by a passing vehicle or train of tubs, or other means.
Industry:Mining
Air forced into a furnace (e.g., cupola) without being previously heated.
Industry:Mining
Air in the liquid state but usually richer in oxygen than gaseous air. A faintly bluish, transparent, mobile, intensely cold liquid. Obtained by compressing purified air and cooling it by its own expansion to a temperature below the boiling points of its principal components, nitrogen (-195.8 degrees C, at 760 mm) and oxygen (-182.96 degrees C, at 760 mm). Used chiefly as a refrigerant and as a source of oxygen, nitrogen, and inert gases (as argon).
Industry:Mining
Air introduced near the bottom of a flotation cell containing pulped ore forms coursing bubbles, which rise through the liquid and emerge as mineralized bubbles forming a semistable froth column. This depends for its continuity partly on the surface-active reagents borne by the mineral in the air-water interphase of each bubble and partly on the aid of frothing reagents.
Industry:Mining
