- 行业: Mining
- Number of terms: 33118
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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 ...
The element is not found free in nature, but occurs as orthoboric acid in volcanic spring waters and as borates in borax and colemanite. The most important source of boron is the mineral rasorite, also known as kernite. Symbol, B. Amorphous boron is used in pyrotechnic flares and in rockets as an igniter; the most important compound, boric acid or boracic acid, is used as an antiseptic; borax is used as a cleansing flux in welding and as a water softener. The isotope boron-10 is used in nuclear reactors; the nitride has lubricating properties similar to those of graphite; and the hydrides have been studied for use as rocket fuels.
Industry:Mining
The elements or component parts of coal. These are determined by chemical analyses that may be performed in different ways. An ultimate analysis provides exact information as to the percentages of the various elements (such as carbon, oxygen, and hydrogen) present in the coal. Another method is by proximate analysis, which determines the relative percentages of carbon, moisture, volatile matter (such as gas and tar), sulfur, and ash.
Industry:Mining
The elements ordinarily present in steel in small quantities without definite intent on the part of the steel maker.
Industry:Mining
The elongate cylindrical tool assembly used in a borehole to acquire a well log. It contains various energy-input devices and/or response sensors. The sonde is lowered into the borehole by a multi-conductor cable, or wire line.
Industry:Mining
The emergence of radiation from that surface of a material through which it entered. Also used to denote the actual backscattered radiation.
Industry:Mining
The emission of light by a substance during its crystallization.
Industry:Mining
The end and side timber bars used for supporting a rectangular shaft. The bars are notched into one another to form a rectangular set of timber. Common sizes are from 9 to 12 in (23 to 30.5 cm) deep and from 3 to 6 in (7.6 to 15.2 cm) thick and may be made 246 from larch, white pine, or red pine.
Industry:Mining
