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Practical Coal-Mining Volume 1

Practical Coal-Mining Volume 1


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About the Book

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. 1908 Excerpt: ...cases great difficulties, owing to the fact that many coals, when heated in air to expel moisture, alter in composition with gain or loss of weight, usually the former. Drying in a vacuum over sulphuric acid at ordinary temperatures is undoubtedly the safest, but commercially is seldom feasible. If not employed, drying for exactly 1 hour at 105 C. (in the Victor Meyer "toluene bath") is to be recommended. In any case the method used should be stated. The error is greatest for bituminous coals, and least for anthracites, but may rarely be expected to amount to more than a few tenths per cent, the results usually being too low. Ash.--This apparently simple determination is again not as easy or definite as commonly supposed. In fact, the amount of ash varies with the conditions of combustion, e.g. with the temperature and supply of air. In no case does the ash correctly represent the actual weight of inorganic matter in the coal, since water, carbonic acid, and sulphur, and even alkalies may have been expelled and oxygen absorbed. The ash obtained upon burning in open vessels in a good current of air (even when precautions against mechanical loss are taken) is usually lower than that obtained in the combustion tube. This appears to be chiefly due to the fact that more sulphur and oxygen are retained in the latter case. The differences are frequently very slight, but sometimes may rise to 0.5 or 0.7 per cent. In cases of dispute this fact should be remembered, the method used should be specified, and the sulphur in the ash determined. It is incorrect to apply the ash obtained in the muffle to the results of the ultimate analysis, the two must be determined simultaneously in the tube. Sulphur.--The total sulphur may be determined by combustion of the c...


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Product Details
  • ISBN-13: 9781130493351
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 62
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130493350
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 127 gr

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