Wat mensen zeggen - Een review schrijven
We hebben geen reviews gevonden op de gebruikelijke plaatsen.
advantage amount antimony arch Arizona arsenic assay average blast blast-furnace blister copper bottom brick brick-work burning Butte City calcination capacity cent chalcopyrite charge chemical chilling chimney clay coal coke concentration condition considerable construction containing cool cost crucible crushing cupola deposits draught economical effect entire expense experience feet fines fire fire-box fire-brick flue fore-hearth fuel fusible fusion gases grade heap heap-roasting hearth heat impurities inches increase iron iron pyrites labor Lake Superior layer lower material matte metallurgist method mineral mines molds molten Montana necessary nickel obtained openings operation ordinary oxidation pig-copper plate portion pounds practice present produced proper proportion pulverized pyrites pyrrhotite quantity quartz reduced refining removed reverberatory furnace roast-heap roasting sample sand side siliceous slag smelter smelting stack stalls sufficient sulphate sulphide sulphuric acid surface tap-hole tapping temperature thick tion tons Total tuyeres usually walls water-jacket weight wood
Pagina xvi - ... Elliot, Sir Warington Smyth, AR Sawyer, A. Giles, R. Bedlington, Edward Combes, George Seymour, Henry Harries, William Cochrane, James Ashworth, J. B. Atkinson, WN Atkinson, Bennett H. Brough, T. Foster Brown, SB Coxon, C. Le Neve Foster, W. Galloway, Max Georgi, WS Gresley, JA Longdon, AR Sennett, MHN Story Maskelyne, Arthur Sopwith, AL Steavenson, A. H. Stokes and others. List of safety appliances, with description of detachment of mineral from its bed, carriage of mineral to the surface, difficulties...
Pagina 136 - ... adjacent vault, where the heat will not be rapidly dissipated. But in works where the calcined ore must be first cooled down before going to the smelter, the cooling arrangements must be of large capacity to handle the heavy charge of ore employed. In the improved cylinders, the fire-box is really a car, running on a track at right angles to the longitudinal direction of the cylinders, and having a short flue in one side that comes exactly opposite the throat of the furnace. In this way, the...
Pagina xxvi - ... p.  Honey Hill (SC), Battle of. See Soule, CC Hong-Kong. The ordinances of the Legislative Council of Hongkong, 1844-90. Compiled by AJ Leach. Hongkong, 1891-92. 2 v. 8°. viii, 602 p.; ix, 603-1372, xxxviii p.  — Ordinances, 1891-93. Hongkong,  -94. 4 v. in 2. 8°.  Hoot, Harry W. Parliamentary tactics for the use of the presiding officer and public speakers. NY, 1893. 12°. 51 p.  Hopkins, William SB In the matter of the public building at Worcester. Argument and evidence...
Pagina ii - the best mining paper in the world." Its reports, criticisms on the technical information it gives, Its market reports, and its peerless and Impartial criticisms of things calculated to injure legitimate mining Investments have gained the approval and confidence of the entire mining industry. The Largest Circulation of any Technical Paper In America. BEST ADVERTISING MEDIUM. ^^ Circulating Among the Largest Buyers oi Tools, Hardware, Machinery of all kinds, Railway and /lining Supplies in every...
Pagina 40 - The cathode is connected with the positive pole of the battery and the anode with the negative or zinc pole of the battery. The cathode should not be completely immersed in the solution to be treated, and when it is supposed that all the copper has been deposited, the cathode can be immersed deeper in the solution and the current allowed to run for half an hour longer. If any copper deposits on the clean surface, it will show at once that all the metal has not been removed from the solution.
Pagina 3 - ... purity of our ores has established such a high standard for this metal. Only the most favorable circumstances, mineralogical, metallurgical, and commercial, would render the working of non-argentiferous fahlores at all practicable. This mineral occurs in small quantities in certain of the Butte copper mines, rendering their product slightly inferior to that from the oxidized ores of Arizona or the pure sulphides of Vermont. This slight disadvantage is, however, far outweighed by their contents...
Pagina 105 - The losses of copper in the above-described roasting have been very generally ignored in judging of its expense. At least, proper emphasis has never been laid on them. Owing to an unexplained difference of several hundred thousand pounds between the fine copper produced at the Duck-town smelter during a period extending over several years, and the monthly fine copper statements arrived at by deducting one and one-quarter unit from the assay-value of the ores produced, the writer's attention was forcibly...
Pagina 402 - ... has been paid to the physical characteristics of substances under examination than has ever yet been done in a work of this kind. To a compilation of all the blowpipe reactions heretofore recognized as correct the author has added a number of new ones not previously published. The entirearrangement of the volume is an original one, and to the knowledge born of an extensive practical experience the author has added everything of value that could be gleaned from other sources. The book cannot fail...
Pagina xiv - ... conclusions reached by earlier investigators, and his masterly discussion of them renders the work classic. Every statement and citation has been carefully weighed and verified and the references to the literature of the subject are given minutely, the book thus furnishing in itself a key to the whole range of steel metallurgy. It also furnishes the results of much new and original investigation, specially undertaken for the present work. Every metallurgist, every manufacturer of steel in any...