Bulletin, Issue 67; Issue 70; Issue 72U.S. Government Printing Office, 1914 |
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Page 39
... surface in rock of similar appearance and copper at a greater depth . It is well known that there are many deposits that yield oxidized ores above water level and sulphides below , so it is easy to understand why the prospector should ...
... surface in rock of similar appearance and copper at a greater depth . It is well known that there are many deposits that yield oxidized ores above water level and sulphides below , so it is easy to understand why the prospector should ...
Page 83
... surface of the charge , and three or a multiple of three water - cooled bottom electrodes of mild steel set in the hearth . Both upper and lower electrodes are arranged in a a Nathusius , H. , The refining of steel in the Nathusius ...
... surface of the charge , and three or a multiple of three water - cooled bottom electrodes of mild steel set in the hearth . Both upper and lower electrodes are arranged in a a Nathusius , H. , The refining of steel in the Nathusius ...
Page 99
... surface . When the slag is completely deoxidized , which is shown by its being white and disintegrating to a powder in air , any desulphurization not completed in the first period is finished by the passage of the sulphur to the slag as ...
... surface . When the slag is completely deoxidized , which is shown by its being white and disintegrating to a powder in air , any desulphurization not completed in the first period is finished by the passage of the sulphur to the slag as ...
Page 112
... silicon ) per ton of steel . This slag dissolves the ferrous oxide that has been forming on the unprotected surface of the metal and thereby becomes black , The reduction of the ferrous oxide in the slag is 112 ELECTRIC FURNACES .
... silicon ) per ton of steel . This slag dissolves the ferrous oxide that has been forming on the unprotected surface of the metal and thereby becomes black , The reduction of the ferrous oxide in the slag is 112 ELECTRIC FURNACES .
Page 11
... surface is a layer of sandstone strongly impregnated with carnotite ; this layer thickens to about 13 inches . The ore here is more like the carnotite - bearing sandstone of Paradox Valley in the southern part of the State . Scattered ...
... surface is a layer of sandstone strongly impregnated with carnotite ; this layer thickens to about 13 inches . The ore here is more like the carnotite - bearing sandstone of Paradox Valley in the southern part of the State . Scattered ...
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Common terms and phrases
acid atmospheric pressure average basin blower Bureau of Mines carbon dioxide carnotite carnotite deposits cent carbon dioxide cent methane charge coal beds concentration containing cost crucible Crucible Steel cubic feet district east electric furnace electric steel furnace electrodes explosions feet a minute feet of methane ferrosilicon figs figure Fire Damp gangway gaseous gases Girod furnace gram hearth heat Héroult furnace Hillman holes inches induction furnace kilowatt-hours La Praz Liévin low-grade magnesite material metal method miles miners nace obtained operation outbursts oxide oxygen Paradox Valley pig iron pitchblende plant pounds power consumption power factor production proportion radium radium bromide radium chloride Red Ash reduced refining return air roof sample sandstone shaft showing slag solution sulphur surface temperature tests tion tons Trollhättan Ugine upcast uranium and vanadium Utah vanadate vanadium variations ventilation volume of gas volume of methane west return
Popular passages
Page 2 - ... obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines. His is an entirely separate office and he should be addressed: SUPERINTENDENT OF DOCUMENTS, Government Printing Office, Washington, DC The general law under which publications are distributed prohibits the giving of more than one copy of a publication to one person. The price of this publication is 10 cents.
Page 96 - BULLETIN 17. A primer on explosives for coal miners, by CE Munroe and Clarence Hall. 61 pp., 10 pis., 12 figs. Reprint of United States Geological Survey Bulletin 423. BULLETIN 20. The .explosibility of coal dust, by GS Rice, with chapters by JCW Frazer, Axel Larsen, Frank Haas, and Carl Scholz.
Page 236 - The selection of explosives used in engineering and mining operations, by Clarence Hall and SP Howell. 1913. 50 pp., 3 pis., 7 figs. BULLETIN 52.
Page 236 - TECHNICAL PAPER 6. The rate of burning of fuse as influenced by temperature and pressure, by WO Snelling and WC Cope. 1912. 28 pp. TECHNICAL PAPER 7. Investigations of fuse and miners' squibs, by Clarence Hall and SP Howell. 1912. 19 pp. TECHNICAL PAPER 11. The use of mice and birds for detecting carbon monoxide after mine fires and explosions, by GA Burrell. 1912. 15 pp. TECHNICAL PAPER 13.
Page 137 - BULLETIN 48. The selection of explosives used in engineering and mining operations, by Clarence Hall and SP Howell.
Page 88 - HNO3 and heat on a steam bath. Wh'en the solution is quiet, remove the cover and evaporate to dryness. Add 3 cc of HC1 and 5 cc of water to the residue and let it stand on the steam bath for a few minutes, stirring occasionally. Dilute with 25 cc of hot water, filter into a small beaker, and wash the residue with warm water.
Page 89 - OF ALUMINA. Nearly neutralize the filtrate with ammonia, have the solutions cool (not warmer than 30° C.), and add powdered carbonate of ammonia in about 2 grams excess to precipitate the aluminum. Let the precipitate settle, filter, and wash it with warm water. If the precipitate is bulky or is at all yellow, dissolve it in a little dilute H2SO4 and reprecipitate with carbonate of ammonia as described.
Page 89 - Heat the liquid containing the lead vanadate precipitate on the steam bath for 1 hour or more, .filter on a tight filter, and wash with warm water. Dissolve the precipitate in the least possible quantity of hot dilute nitric acid, neutralize as before, add 3 cc of nitric acid in excess, add 2...
Page 20 - The most typical ore is a sandstone so impregnated with yellow carnotite that the color is decidedly noticeable and containing small kidneys of brown sandy clay. The kidneys constitute a considerable part of some of the ore; in many cases they are thinly scattered through the sandstone. It seems to be generally acepted among the operators that the kidneys are rich in vanadium.
Page 96 - BULLETIN 44. First national mine-safety demonstration, Pittsburgh, Pa., October 30 and 31, 1911, by HM Wilson and AH Fay; with a chapter on the explosion at the experimental mine, by GS Rice.