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Transactions of the American Institute of Mining Engineers Volume 39

Transactions of the American Institute of Mining Engineers Volume 39


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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. 1909 Excerpt: ...Considered briefly, the results of these tests, in the abovenamed order, are: 1. Hydraulic Classification. A number of tests were made with quartz paired with galena, antimony, arsenopyrite, magnetite, sphalerite, etc., in different proportions, and with a velocity varied between wide limits, in order to determine whether a fixed ratio existed as to the diameters of the grains of the two minerals. All tests under this head were made in a Munroe hydraulic laboratory-classifier. "Without going into details of the methods, etc., the results indicated that whether or not a more perfect separation was effected in the classifier-tube itself, the manner of drawing off the classified products always resulted in giving a large proportion of mixed products, and after a number of calculations upon different drawings, similar to the manner detailed under the pulsion-jig tests, and described by Professor Richards,6 proved to my satisfaction that no such ratio existed with classified products under the conditions the above type of classifier was operated and the products removed. 2. Pulsion-Jig Tests. The largest size of Munroe hydraulic classifier was first fitted up in such way that a column of ore 5 to 6 in. long was supported upon a bedding of large grains, and then treated with a pulsating current of water. The tube in which the jigging took place had a diameter of about 1.75 in., and the pulsion was effected by compressing a rubber tube connecting the bottom of the ore-column with a pressure-head of water. The compression of the tube was effected both by mechanical means and by hand, and apparently it made little difference which method was used. The bedding-grains served only to support the ore-column and confine it within the tube; and in drawing oft the pro...


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Product Details
  • ISBN-13: 9781231047965
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 332
  • Spine Width: 18 mm
  • Width: 189 mm
  • ISBN-10: 1231047968
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 594 gr


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