Bulletin, Issue 67; Issue 70; Issue 72U.S. Government Printing Office, 1914 |
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Page 13
... lower portion of the furnace was of more solid construction . The electric current was introduced at opposite sides of the furnace . The most important alteration was , however , that the hearth was lined with magnesite brick . In ...
... lower portion of the furnace was of more solid construction . The electric current was introduced at opposite sides of the furnace . The most important alteration was , however , that the hearth was lined with magnesite brick . In ...
Page 25
... lower than when the same quality of charge is used in an ordinary blast furnace , owing to the lower consumption of charcoal in the electric furnace . The sulphur content is , however , slightly higher in the product of the electric ...
... lower than when the same quality of charge is used in an ordinary blast furnace , owing to the lower consumption of charcoal in the electric furnace . The sulphur content is , however , slightly higher in the product of the electric ...
Page 33
... ° -Bull . 67-14- -3 highest temperature stated to have been attained at the lower PROBLEMS IN ELECTRIC SMELTING OF IRON ORES . 33 Unsolved problems Volume of shaft as compared with capacity of furnace_ Reduction of ore in shaft__.
... ° -Bull . 67-14- -3 highest temperature stated to have been attained at the lower PROBLEMS IN ELECTRIC SMELTING OF IRON ORES . 33 Unsolved problems Volume of shaft as compared with capacity of furnace_ Reduction of ore in shaft__.
Page 34
highest temperature stated to have been attained at the lower end of the stack in the work at Trollhättan was 965 ° . Granting that the temperature of the gas as it enters the stack may be even 1,000 ° , in- asmuch as the weight of the ...
highest temperature stated to have been attained at the lower end of the stack in the work at Trollhättan was 965 ° . Granting that the temperature of the gas as it enters the stack may be even 1,000 ° , in- asmuch as the weight of the ...
Page 40
... Lower California , Mexico . This company has ac- quired these properties for the reason that they believe the problem of using oil as a reducing agent will ultimately be solved , and thus permit the establishment of an iron and steel ...
... Lower California , Mexico . This company has ac- quired these properties for the reason that they believe the problem of using oil as a reducing agent will ultimately be solved , and thus permit the establishment of an iron and steel ...
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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.