- 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 ...
Separation of solid particles, in a fluid (air, water, etc.), because of different densities or masses.
Industry:Mining
Separation of two materials of different densities by passing a dilute suspension over a slightly inclined table having a reciprocal horizontal motion or shake with a slow forward motion and a fast return.
Industry:Mining
Separation size, designated size, or control size used to define analyses of the products of a sizing operation.
Industry:Mining
Sequence control by means of a pilot cable is effected by means of a low-voltage supply from one contactor panel to the next, or by means of a line voltage pilot cable. Each contactor has an auxiliary contact that controls the supply to the next contactor. In the low-voltage system, the secondary of each potential transformer is earthed at the preceding panel through an auxiliary switch which closes with the contactor. Until these secondary potential transformer circuits are completed, by closing the auxiliary contact, the next conveyor cannot start.
Industry:Mining
Sets of intersecting joints that are sometimes perpendicular or rectilinear, and often mineralized to form vein systems. Joint patterns such as these are believed to be the result of compressive stresses that were relieved by joint formation rather than the formation of a single fissure.
Industry:Mining
Several borides are known, including the following: Ta B<sub>2</sub>, melting point, 3,200 degrees C; sp gr, 12.5; thermal expansion, 5.5 X 10<sub>-6</sub>; TaB, melting point, 2,400 degrees C; sp gr, 14.3; Ta<sub>3</sub>B<sub>4</sub>, melts incongruently at 2,650 degrees C; sp gr, 13.6.
Industry:Mining
Several steel wires twisted together to form one strand of a wire rope or cable.
Industry:Mining
Shaft sinking in rock usually comprises the following cycle: drilling a round of holes, blasting, removing the broken rock, trimming the shaft to form, placing the sets or concrete in position, and then preparing to drill the next round.
Industry:Mining
