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The Colliery Engineer Volume 30: (English)

The Colliery Engineer Volume 30: (English)

          
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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. 1910 Excerpt: ...Op Mill Used In Joplin Zinc District To obviate this difficulty the material must be sized previous to attempted concentration, after which there will be heavy small particles of minerals and relatively light particles of the same size that can be readily separated. The heavy particles will fall to the bottom, and the lighter particles will arrange themselves on top in layers according to their respective specific gravities, thus the hydrometallurgist obtains three products: headings, or clean minerals; middling, or unseparated mineral and gangue; and tailings, or waste. In unsized ore a comparatively large piece of gangue, or gangue with ore attached will fall as rapidly as a smaller body of greater specific gravity, or more rapidly than a body of ore smaller still. This results in a mixed product, the ore decreasing and the gangue increasing from the bottom up. In each layer the particles of ore and gangue, although differing in size, are in the ratio of their weights to the resistances they offer to free fall. According to Rittinger the shape as well as the weight of the particle influences its rate of fall in water; for instance he furnishes a formula from which it is deduced that the rate of fall of a round grain is 1.42 +times that of a flat grain of equal diameter and specific gravity. Professor Richards found that these formulas do not hold in all cases in practice and has furnished a table from which may be obtained the diameter of a quartz grain that will settle as fast as a mineral of greater specific gravity and lesser diameter. For example, if a piece of copper of a certain size falls in water with a velocity of 7 inches per second then a piece of quartz 3.58 times as large will fall with the same velocity. Screens of fine mesh are not very sat...


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Product Details
  • ISBN-13: 9781153599825
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 824
  • Series Title: English
  • Weight: 1442 gr
  • ISBN-10: 1153599821
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 42 mm
  • Width: 189 mm


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