- 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 method for determining the uranium in any of its ores in which the uranium is extracted with dilute nitric acid. This extract is then diluted, filtered, and treated with ferric chloride and sodium carbonate causing the vanadium iron and aluminum to precipitate. The uranium is then precipitated from the filtrate by boiling with caustic soda and purified by solution in nitric acid. Following precipitating with ammonia, the ammonium uranate is ignited to the oxide, and weighed. When this weight is multiplied by the factor 0.847, it gives the weight of uranium.
Industry:Mining
A method for draining combustible gases from coal seams in which superjacent entries are developed over the coal seam being mined. The entries are located from about 80 to 138 ft (24 to 42 m) above the seams to be mined and are often supplemented with up or down boreholes drilled perpendicular to the walls of the entries. Also known as the superjacent roadway system.
Industry:Mining
A method for evaluating the resistance of paving bricks to impact and abrasion. A sample of 10 bricks is subjected to the action of 10 cast-iron balls 3.75 in (9.53 cm) in diameter and 245 to 260 balls 1.875 in (4.76 cm) in diameter in a drum 28 in (71.12 cm) in diameter, 20 in (50.8 cm) long, rotating at 30 rpm for 1 h. The severity of abrasion and impact is reported as a percentage loss in weight.
Industry:Mining
A method for examining the mineral particle content of drilling water. In this method, a glass cell is filled with the water, a little acid is added, and the sample is placed under a microscope. Dark ground illumination is used, which shows up the suspended particles. The number of these is counted, and this number, multiplied by a factor, gives the number of particles per cubic centimeter.
Industry:Mining
A method for fighting underground coal fires. This air-blowing technique involves the injection of an incombustible mineral, like rock wool or dry sand, through 6-in (15.2-cm) boreholes drilled from the surface to intersect underground passageways in the mines.
Industry:Mining
A method for identifying and measuring the chemical elements in a sample to be analyzed. The sample is first made radioactive by bombardment with neutrons, charged particles, or other nuclear radiation. The newly radioactive atoms in the sample give off characteristic nuclear radiations that can identify the atoms and indicate their quantity.
Industry:Mining
A method for interpolating spatial sample data and determining values between data points. A value interpolated for any spatial point is determined by applying a weighting factor based on distance between the spatial point and surrounding sample data. Selection of sample points to include in the calculation may be determined by minimum and/or maximum distance, azimuth orientation, and the minimum and/or maximum number of the nearest sample data points. Abbrev. IDS.
Industry:Mining
A method for local hardening in which the steel is heated by a mechanically operated oxyacetylene blowpipe, which traverses the object to be hardened at a predetermined rate.
Industry:Mining
A method for measuring borehole deviation that photographs time, temperature, and inclination from the vertical on 16 mm film and can take 1,000 readings descending then ascending the hole as a check. The gyroscope maintains the casing on a fixed bearing.
Industry:Mining
A method for measuring the refractive index of a prism or a liquid in a hollow prism by determining the minimum deflected angle of a light beam.
Industry:Mining
