Transactions - North of England Institute of Mining and Mechanical Engineers Volume . 35

Transactions - North of England Institute of Mining and Mechanical Engineers Volume . 35

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 edition. Excerpt: ...proportion of these rock-forming materials than the latter, but they hold much less water. Although all the deposits that have been described are at their outcrops more or less hydrated peroxides, yet there is scarcely room for doubt that originally they existed as carbonates, and that they have been altered by the action of oxygenated water in accordance with the re-action indicated by the following chemical formula: --4 Fe C0, + 0, + 3 H, O = Fe4 H O, + 4 CO., In other words the carbonate of iron has been decomposed; carbonic acid given off, and oxygen and water taken up. One of the results of this re-action is a loss of volume of about 18 per cent. As, however, the ore contains a considerable percentage of impurities which would be unaffected by the above re-action, the loss of volume would not be so great as just stated. For the purpose of illustration let it be assumed that the constitution of the unaltered ore was as follows: Percentage Weight. Carbonate of iron...... 66 Silica, alumina, lime, etc.... 34 100 The diminution of volume resulting from the alteration of this ore, in accordance with the above formula, would be about 12 per cent. Thus an explanation of the open joints and the increased porosity of the ore at the outcrop is obtained, and it is also seen why the ore is more altered and less compact as it is more accessible to atmospheric water, and conversely why it is more compact and less altered as its protection from the action of such water increases--as set forth in the detailed descriptions of the deposits of Mid-Lincolnshire and Northamptonshire. The unequal distribution of iron in the altered part of the bed, that is in the alternating bands of yellow and brown ore, is a problem of more difficulty, but it is more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236577671
  • 9781236577672