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Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume N . 25

Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume N . 25 by American Institute of Mining

Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume N . 25
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Author: American Institute of Mining
Page Count: 380 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781236087553
File size: 18 Mb
Download Link: Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume N . 25
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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. 1896 Excerpt: ...of the first concentrate and the percentage of middlings to be re-crushed and re-separated can be accurately controlled. There was no such discriminating power in the earlier types of separators; and, although a part of the ore obtained from a first separation might again pass through a second and sometimes a third separation, these machines were all, essentially, only two-part separators; for, at each passage of the ore, only two parts were produced, neither of which could be economically disposed of at once, as finished. The impression has been somewhat prevalent among ironmakers that the cost of crushing and separating ore would be prohibitive, but this impression has doubtless been founded upon the poor results obtained from attempts to use inefficient and incapable types of separators and from faulty conceptions of method. Two-part separation with the old types of separators, water-jigs, etc., could find but one end--a desperate and costly struggle against discouraging results; poor concentrates, or excessive outlay in plant and from 20 to 40 per cent, of the value contained in the ore left in tailings. On the other hand, as has been shown, a separating-plant organized to execute a correct method may easily work at an efficiency of above 95 per cent., and this standard, in commercial practice, has been reached in operations extending through some years of time. Vol. xxv.--35 Fabulous sums are expended in mining, transporting and melting slag-making rock in furnaces. A modern furnace costs much more than a modern separating-plant, both in original outlay for construction and in expense of operation, and can not begin to handle and dispose of so much raw material; and while the gangue or slag-making material when treated in the furnace must be transporte...

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