- 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 ...
Upright lime kiln in which the fuel (coal) is mixed and burned with the limestone charge.
Industry:Mining
Uranium is soluble in acid waters and tends to be removed in solution, but radium is much less soluble and its compounds tend to remain behind in the leached outcrop. Therefore, the outcrop may be radioactive due to the presence of the gamma-emitting elements RaC and RaD, even though much of the uranium has been lost in solution. In this case a radiometric assay may indicate a high counter reading, but the uranium content may be low. Uranium minerals deposited less than a million years ago may be in inequilibrium because daughter products have not accumulated in their equilibrium amounts. Hence, counter readings may indicate less uranium than is actually present.
Industry:Mining
Use of a series of heavy liquids diminishing (or increasing) in density by accurately controlled stages for the purpose of dividing a sample of crushed coal into gravimetric fractions either equal-settling or equal-floating at each stage. The floats at a given specific gravity are defined as the percentage floating at that density and the sinks have a 1231 defined higher density. Each product (minus one density and plus another) is analyzed after weighing and the ash sulfur and Btu content is found. From this testing, a washability curve is drawn that relates density with ash sulfur and Btu content, in the form of cumulative float, sink, and specific gravity curves. The ash curve plots ash against density for successive fractions. The densimetric curve plots specific gravity against cumulative weight. The Mayer curve (M-curve) plots cumulative weight against that of a constituent (e.g., ash).
Industry:Mining
Use of an electrode reversible to the ion under test to form a half cell. This is connected by a salt bridge to a reference electrode, and the resulting electromotive force is measured.
Industry:Mining
Use of circulating brine in a system of pipes to freeze waterlogged strata so that shafts can be sunk through them, established, and lined.
Industry:Mining
Use of compressed air to move fairly fine aggregates laterally and/or vertically.
Industry:Mining
