- 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 ...
A steel, carbon, or ceramic die in which the shape of a bit crown is incised and provided with pips, grooves, or holes in which diamonds are set and held by suction or an adhesive. Filling the die with a matrix alloy by a casting or a powder metal-sintering process affixes the shank to a diamond-inset bit crown having a shape conforming to that incised in the die.
Industry:Mining
A steel, carbon, or ceramic die in which the shape of a bit crown is incised and provided with pips, grooves, or holes in which diamonds are set and held by suction or an adhesive. Filling the die with a matrix alloy by a casting or a powder metal-sintering process affixes the shank to a diamond-inset bit crown having a shape conforming to that incised in the die.
Industry:Mining
A steel, carbon, or ceramic die in which the shape of a bit crown is incised and provided with pips, grooves, or holes in which diamonds are set and held by suction or an adhesive. Filling the die with a matrix alloy by a casting or a powder metal-sintering process affixes the shank to a diamond-inset bit crown having a shape conforming to that incised in the die.
Industry:Mining
A steel, chisel-shaped cutting-edged bit designed to be coupled to a string of drill rods and used to fragment, by impact, boulders, hardpan, and lost core in a borehole. Also 586 called chisel bit; chisel-edge bit; chisel-point bit; long-shank chopping bit. Compare: crosschopping bit
Industry:Mining
A steel-gray dioxide of manganese, MnO<sub>2</sub>, crystallizing in the tetragonal system. It is distinguished from pyrolusite by its hardness and anhydrous character.
Industry:Mining
A steel-gray iron sulfide with about 20% cobalt and nickel, (CoNiFe)S<sub>2</sub>. Minute pyritohedral crystals; isometric. Probably a mixture of siegenite and pyrite. Formerly called cobaltnickelpyrite. From Musen, Westphalia, Germany.
Industry:Mining
A steel-gray iron sulfide with about 20% cobalt and nickel, (CoNiFe)S<sub>2</sub>. Minute pyritohedral crystals; isometric. Probably a mixture of siegenite and pyrite. Formerly called cobaltnickelpyrite. From Musen, Westphalia, Germany.
Industry:Mining
A steelmaking method similar to the L.D. except that powdered lime is blown with the oxygen stream (therefore, the letters O.L.P.--oxygen- lime-powder).
Industry:Mining
A steelmaking process in which oxygen is fed into a large inclined rotating vessel through water-cooled lances, but at velocities somewhat lower than in the L.D. steel process, so that the jet does not completely or continuously penetrate the slag layer. In some respects, it is like a continuously rotating open hearth. It gives better heat utilization than the L.D. steel process but is slower.
Industry:Mining
