Monograph - Geological Survey of Alabama Volume 7

Monograph - Geological Survey of Alabama Volume 7

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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. 1912 edition. Excerpt: ...of this loose, sandy looking dolomite, how Per cent. Silica Oxide of iron and alumina Carbonate of lime (Lime 30.31) Carbonate of magnesia (Magnesia 20.71.) 1.25 1.00 54.00 43.00 ever, is low in silica, some of it carries 3.00 per cent, and one sample carried 4.00 per cent. It does not form a large proportion of the material in the quarry and is mined and shipped with the other stone. Both limestone and dolomite are quarried on the face, no underground work being required. Crushed or lump stone is shipped as the demand may require. The amount of stone used per ton of iron varies of course, with the quality of the stone, with the nature of the are and fuel and, to some extent, with the grade of iron made. The range is from 0.30 to 0.80 of a ton. No attempt has been made on any considerable scale to use calcined stone, whether limestone or dolomite, except in so far as the calcination of the limy ore may be considered an attempt to calcine the carbonate of lime contained in it. The question may be stated in general terms. As already observed, th limy ore is an intimate mixture of oxide of iron, silica, alumina and carbonate of lime. The better grades contain 37 per cent, of iron, 13.30 per cent, of silica and 15.50 per cent, of lime. The admixture of these materials is far more perfect than could be attained by any artificial means. Is it more economical to use this ore, in which the flux is already so well mixed with the siliceous ingredients of the ore than to use an ore of much less content of lime and therefore requiring the addition of extraneous flux? The furnace-man has merely to decide whether he can make as cheap iron, as much iron and as good iron in the one way as in the other. These are the chief questions. In addition, however, ..
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Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • United States
  • English
  • black & white illustrations
  • 1236806778
  • 9781236806772