- المجال: 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 method for the recovery of sulfur as liquid sulfurous anhydride from furnace gases.
Industry:Mining
A method for the sintering of the raw materials for the burden of blast furnaces in which continuous sintering is carried out in a rotating tube furnace; at the discharge end a special tuyere is arranged comprising two concentric close-ended tubes parallel to the furnace axis, the outer tube having one nozzle near its closed extremity, the other having a number of nozzles protruding through the outer tube. The inner tube supplies air heated to 650 to 800 degrees C; the outer one carries cold air, which keeps the inner tube from softening and becoming deformed and itself becomes somewhat heated by the time it emerges from the nozzle. These jets are directed upon the material to be sintered. The fine iron-bearing material is mixed with a proportion of fuel; under the intensive action of the hot air blast, the fuel raises the temperature of the mixture sufficiently for sintering to occur, whereupon the material is discharged from the furnace.
Industry:Mining
A method for the smelting of pyrites that entails the roasting and magnetic concentration of the raw material followed by reduction in a rotary kiln or electric furnace. The product may be briquetted and reduced in the blast furnace, but is better smelted in an electric furnace.
Industry:Mining
A method in which bauxite is fused in an electric furnace to form a synthetic corundum.
Industry:Mining
A method in which finely divided material is rolled in a drum or on an inclined disk, so that the particles cling together and roll up into small, spherical pellets. The addition of a binder may be required to produce a pellet of acceptable mechanical strength.
Industry:Mining
A method in which the bucket is lowered to the sea floor and dragged over the ocean floor for some distance in order to collect samples. Dredge and trawl hauls normally can only give a rough indication of heavy or light concentrations of the minerals within an area.
Industry:Mining
A method in which the cleanest fraction of the coal with an ash content of 1% to 2% (for hydrogenation, etc.) is separated; the remainder giving coal with an ash content of 10% to 15% (for boiler firing, etc.) and finally incombustible shale.
Industry:Mining
A method in which, by using an excess of explosives in the strip mine bench, up to about 40% of the overburden can be removed from the coal seam by the energy of the explosive, thereby requiring no excavation.
Industry:Mining
A method of advancing power-operated supports on a longwall face. Double-acting hydraulic jacks are used in conjunction with supports that slide forward on the floor and provide their own abutments for both their forward movement and that of the conveyor.
Industry:Mining
A method of alluvial mining that consists of (1) excavating and breaking up the gravel bank by using giants or monitors, (2) washing the disintegrated material into a sump, excavated in the bedrock, (3) elevating the mixture from the sump to an elevated line of sluices by means of a gravel pump, and (4) sluicing the gravel for the recovery of its mineral content.
Industry:Mining
