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Bulletin of the American Institute of Mining Engineers Volume 92-96

Bulletin of the American Institute of Mining Engineers Volume 92-96


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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. 1914 Excerpt: ... widths, where not due to improper setting or improper mill feeding, or both, is largely owing to the fact that the metal is not of uniform density, resulting from being worked in a tire mill, which was too light for the heavy and thick section passing through the rolls. Life of Shells The limits of this article do not permit as exhaustive a treatment of this sub-heading as the writer would like to submit, based on data gathered during the past 13 years in furnishing the mining public in the West with steel roll shells and material of kindred nature, but for the sake of generality as well as brevity the following examples taken from users of roll shells in the widely separated states of Montana, Colorado, Sonora, Arizona and Utah will illustrate what may be considered good average records of the life of steel roll shells and Chilean mill wearing parts. Mill No. 1 (Montana).--The mills used were 6-ft. Evans-Waddell and 6-ft. Monadnock type, being fed by revolving distributors in the center. The ore crushed was very hard with about 65 per cent, silica. The size of feed was 3 mm. and discharge, 16 mm. The rate of crushing was 80 tons per 24 hr. or 2,400 tons per month. The life of the tires was 4 months per set of three, running continuously; the life of dies, 2 months, running continuously. The amount of rock crushed per pound of steel consumed was 1.06 tons. Mill No. 2 (Colorado).--At this plant, 6-ft. Evans-Waddell mills, fed by revolving distributors at the center, were used. Roasted ore, assaying 60 per cent, silica was fed, sized as follows: On 5/32, 4 per cent.; on 10 mesh, 15; on 16 mesh, 16; on 20 mesh, 7; on 30 mesh, 11; and through 30 mesh, 47 per cent. The discharge gave the following screen analysis: On 30 mesh, 1 per cent.; on 40 mesh, 13; on 60 ...


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Product Details
  • ISBN-13: 9781130225426
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 452
  • Spine Width: 23 mm
  • Width: 189 mm
  • ISBN-10: 1130225429
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 803 gr


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