- 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 ...
Most molybdenum is a byproduct of mining porphyry copper deposits.
Industry:Mining
Most of the larger modern machines are electrically driven and are equipped with the Ward-Leonard system of control, which allows alternating current of fairly high voltage to be carried to the shovel over a very flexible electric cable. This cable is usually carried on a sled back of the shovel or on a reel on the shovel base. The current drives an alternating current motor, which is connected to, and drives, direct current generators, one for each of the operations of the shovel, and an exciter. Each direct current generator and the direct current motor which it drives are in a closed circuit. The field in each circuit is regulated by magnetic contactors or by rotating controls actuated by master controllers at the operator's position.
Industry:Mining
Most vanadium is obtained from vanadium-bearing magnetite (1% to 2.2% V) in South Africa. Other sources include patronite, carnotite, roscoelite, vanadinite, descloizite, and volborthite.
Industry:Mining
Movable sieve box supported on a rubber diaphragm and jigged mechanically up and down.
Industry:Mining
Movement of a charged particle through an electrolyte toward an electrode of opposite charge sign. The losses in a neutral salt around two electrodes during the passage of electric current are in ratio to velocities of ions migrating from these electrodes. Ionic velocities are stated in centimeters per second for a potential gradient of 1 V/cm.
Industry:Mining
Movement of crop load in a ball mill rotating at such a speed that the balls breaking free at the top of the rising load roll quietly down to the toe of the charge. With increased peripheral speed, motion changes to turbulent cataracting and, still faster, to avalanching when the upper layer of crushing bodies breaks clear and falls freely to the top of the crop load.
Industry:Mining
Movement or transportation of excavated or mined materials in cars or trucks running on rails.
Industry:Mining
