Mining and Metallurgy Volume 7-12

Mining and Metallurgy Volume 7-12

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ... middle line of the fire-box are four charge-openings, 12 in. square, through which the four coal-hoppers discharge into the fire-box. There are ten side-doors, each 8 by 15 in., with sills 18 in. above the level of the skim-plate at the front. The sides of the furnace and the fire-bridge are stepped off for several courses on the inside, thus strengthening the lower portion of the walls and the bridge. There are four charge-openings in the roof, each having circular covers. Through these openings the charge from the two hoppers above drops into the furnace. The operation of these furnaces is as follows: --In the firebox of a furnace, which has been shut down for repairs, a fire of wood is put, followed by an increasing firing of coal, until, in 48 hr., the first charge may be dropped in. As fast as charges are melted, others are added, until the furnace has been filled. The furnace takes from 10 to 15 days to get up to its full heat. The charges of 15 tons are put in, on the average, every 80 min., 10 tons being dropped from the first hopper and 5 tons at the second one, 90 ft. from the front of the furnace. It must be noted that the charge drops upon a bath of a minimum depth of from 3 to'4 in. of matte with 8 in. of slag above it, so that there is little chance of the new charge sticking to the hearth. The hot calcines, of which the charge is principally composed, spread out less than commonly represented. There is, however, a movement of the entering charge towards the front of the furnace, in consequence of which the ore may be observed floating down in two ridges towards that end, and gradually spreading out. Heat is taken up not only from the flame, but also from the highly-heated molten bath of the furnace, in consequence of which, more

Product details

  • Paperback | 392 pages
  • 189 x 246 x 21mm | 699g
  • United States
  • English
  • black & white illustrations
  • 1236816595
  • 9781236816597