- 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 ...
Method of case-hardening iron by use of ammonium chloride, manganese dioxide, and potassium ferrocyanide.
Industry:Mining
Method of demagnetization in which a substance is passed through a coil that carries alternating current of progressively diminishing strength.
Industry:Mining
Method of determining the velocity distribution by recording in a borehole.
Industry:Mining
Method of distributing the revealed irregularities over a series of results.
Industry:Mining
Method of dividing a substance into various particle sizes by means of air currents.
Industry:Mining
Method of drilling that uses rotating bits lubricated by a stream of mud.
Industry:Mining
Method of ore treatment based on differences between dielectric constants of minerals suspended in an intermediate nonconducting fluid, when subjected to electric fields. Of limited use in laboratory work.
Industry:Mining
Method of recovering copper from burned sulfides, by roasting with rock salt and using the issuing gases, after condensation, to leach the chloridized residue. Copper then dissolved is precipitated from the leach liquor onto scrap iron.
Industry:Mining
Method of reducing a large sample of ore to yield a representative sample. A conical heap is made by shoveling the material accurately on to the apex so that it runs down equally all around. The heap can then be flattened somewhat by rubbing with a spade, and is shoveled into four equal heaps, the same amount being taken from the base of the cone each time the worker goes around. Of the four smaller heaps thus formed, two are discarded and two retained. These may now be crushed to improve the ease of thorough mixing, and are then formed into another cone in the same way as the first. The process is repeated, with periodic size reduction of the retained portions, until the required small sample has been produced.
Industry:Mining
Method of regeneration of foul cyanide liquor from the gold leaching process. The barren solution is acidified, and gaseous hydrocyanic acid (HCN) is liberated, separated, and reabsorbed in an alkaline solution, such as lime water.
Industry:Mining
