- 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 ...
A modification of the series process of copper refining in which the electrodes lie horizontally, the top surface of each one acting as anode, the lower as cathode. Theoretically, it has the advantage of extremely low metal losses and great purity of copper.
Industry:Mining
A modification of the sulfuric acid parting process for bullion containing large amounts of copper. A large excess of acid is used; the silver sulfate is then reduced with charcoal, or, in the original process, ferrous sulfate.
Industry:Mining
A modification of the use of ultrasonic waves for the detection of internal flaws in metals. By using a persistent screen cathode ray tube and causing the echoes to brighten the trace instead of deflecting it, an ultrasonic image is produced that can be examined and interpreted like a radiograph.
Industry:Mining
A modification of the Ward-Leonard system of speed control, in which a heavy flywheel is carried on the motor-generator shaft to smooth out peak loads, which would otherwise be taken from the power supply. The system is used on mine winding engines, etc.
Industry:Mining
A modified double-spiral cut, the benefits of which are that the holes are located vertically below one another on one and the same line to facilitate drilling.
Industry:Mining
A modified form of chisel used in drilling, in which one end of the cutting edge is extended further from the center of the bit than the other.
Industry:Mining
A modified form of direct-rope haulage, in which a power-driven reversible pulley (surge pulley) is used instead of a drum. The full trams are hauled up on one end of the rope while the empties go down on the other end. It involves a double track or a bypass midway on the haulage plane. The descent of the empty trams assists in balancing the load being hauled upwards.
Industry:Mining
A modified gyratory crusher used in secondary ore crushing that consists of a downward-flaring bowl within which is gyrated a conical crushing head. The main shaft is gyrated by means of a long eccentric that is driven by bevel gears.
Industry:Mining
A modified Scotch hearth in which poking or rabbling is done mechanically.
Industry:Mining
