- 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 ...
In mineral identification, a piece of unglazed porcelain, hardness about 7 on the Mohs scale, used for rubbing a sample to obtain its powder color, or "streak."
Industry:Mining
In mineral identification, a polished section is placed in contact with photographic paper, a current is passed, and ions migrating to the paper are developed so as to produce a color print suitable for microscrutiny. It resembles sulfur printing.
Industry:Mining
In mineral identification, borax or other flux is fused to a transparent bead by heating in a blowpipe or other flame in a small loop formed from platinum wire. When suitable minerals are flux melted in this bead, characteristic glassy colors are produced in an oxidizing or reducing flame and serve to identify specific chemical elements.
Industry:Mining
In mineral identification, qualitative tests made by moistening powdered material with hydrochloric acid, placing a few grains on platinum or nickel-chrome wire, and noting any color imparted to a blue Bunsen flame. Sodium gives a strong yellow flame; calcium, light red; strontium, crimson; barium, green; potassium, lilac; and copper, bluegreen.
Industry:Mining
In mineral optics, refers to crystal edges or cleavage traces parallel to the optic directions of the mineral. Compare: extinction
Industry:Mining
In mineral processing, a porcelain jar used for laboratory batch grinding tests in ceramic ware.
Industry:Mining
In mineral processing, a quantity or condition that is varied as a function of the actuating signal so as to change the value of the controlled variable.
Industry:Mining
In mineral processing, a stationary round table onto which finely divided pulp (slimes) is fed from the center from a revolving feed box. A light wash of water follows, and lighter particles are washed downslope to a peripheral discharge launder. Behind this a heavier water flush displaces the settled heavier material (concentrates) and flushes it down to a bridging arrangement that delivers it to a separate discharge.
Industry:Mining
In mineral processing, adherence of an impalpably fine layer of particles of another (for example, calcite on galena), therefore hindering or preventing true surface reaction in leaching or flotation.
Industry:Mining
In mineral processing, development of selective attraction to the water phase of a pulp, as a prelude to flotation of an air-attracted fraction of the contained minerals.
Industry:Mining
