- 行业: Mining
- Number of terms: 33118
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- 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 metallic cup, usually containing fulminating mercury, in which are fixed two insulated conducting wires held by a plug, the latter holding the ends of the wires near to but not touching each other. At this plug is a small amount of a sensitive priming. When an electric current is sent from the battery through these conductors, the resulting spark fires the priming, then the fulminate and the charge of the explosive proper.
Industry:Mining
A metallic element of the alkaline-earth group; never found in nature uncombined, occurs abundantly as limestone (CaCO<sub>3</sub>), gypsum (CaSO<sub>4</sub>. 2H<sub>2</sub>O), and fluorite (CaF<sub>2</sub>). 473 Symbol, Ca. Used as a reducing agent, deoxidizer, desulfurizer, or decarburizer for alloys; as quicklime (CaO), it is the great cheap base of the chemical industry with countless uses.
Industry:Mining
A metallic element resembling lead in physical properties; the metal is silvery-white, but turns bluish-gray in air. Symbol, Tl. Occurs in crooksite, lorandite, and hutchinsonite. It is also present in pyrites and is recovered from the roasting of this ore in the manufacture of sulfuric acid and from the smelting of lead and zinc ores. Used in low-melting glasses, photocells, and infrared detectors.
Industry:Mining
A metallic product of very indefinite composition, made (usually) in reverberatory furnaces by smelting rich cupriferous substances without sufficient sulfur to quite satisfy the copper present.
Industry:Mining
A metallic shield consisting of nonmagnetic material applied over the insulation of the individual conductors or conductor assembly.
Industry:Mining
A metallic sulfide mixture made by melting the roasted product in smelting sulfide ores of copper, lead, and nickel.
Industry:Mining
A metallic, steel-gray, brittle element. Symbol, As. Found native in realgar and orpiment, and combined with heavy metals. Used in bronzing, pyrotechny, insecticides, and poisons, and as a doping agent in transistors. Gallium arsenide is used as a laser material to convert electricity directly into coherent light. Arsenic and its compounds are poisonous.
Industry:Mining
A metallurgical method for treating lead ore, the characteristics of which are the smallness of the charge; the slow roasting, so that for every part of lead sulfide one part of sulfate and at least two parts of oxide are formed; the low temperature at which all of the operations are carried on; and the aim to extract all the lead in the reverberatory. The hearth is inclined toward the flue, and the lead is collected outside the furnace.
Industry:Mining
A metallurgical method for treating lead ore, the characteristics of which are the smallness of the charge; the slow roasting, so that for every part of lead sulfide one part of sulfate and at least two parts of oxide are formed; the low temperature at which all of the operations are carried on; and the aim to extract all the lead in the reverberatory. The hearth is inclined toward the flue, and the lead is collected outside the furnace.
Industry:Mining
