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Reports of Geological Explorations Volume 6: (English)

Reports of Geological Explorations Volume 6: (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. 1871 Excerpt: ...sand after it has left the stampers, without reducing its coarseness sensibly, should be sufficient to clean the surfaces of any exposed gold granules that had escaped with an adherent film of sulphide. Chemically, this abrasion may be performed with a greater diversity of re-agents than those which are available for the brightening or cleansing of mercury. Some of the methods for accomplishing this have been already incidentally stated, but the same objections against treating the water, to prevent flouring of the mercury, also apply here. Crooke's sodium amalgam effects the immediate removal of the sulphurized film, metallic sodium combining energetically with sulphur, and decomposing its compounds rapidly. This accomplished, then there is nothing to intervene between the gold and the mercury, and amalgamation commences. It is pretty certain the good effects frequently attending the use of this amalgam, are properly referable to this action on the thin films of sulphur compounds attached to the surfaces of the gold to which it is applied, and not to the action of the sodium upon the mercury. It has been stated that except in case of the more cupreous native golds, the process of roasting these sulphurized ores removes the sulphur, and renders the enclosed gold more amalgamable. But though these good effects upon sulphurized gold are palpable enough on a small scale, it is conceived that on the large scale it would not be equally easy, but in fact likely, by the application of a similar process, to make the gold worse than it was at first. Unless the roasting be thoroughly done, the whole of the sulphur driven off or oxydized, and the temperature towards the end of the process raised or kept at a dull red heat, it is certain that gold which might have been...


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Product Details
  • ISBN-13: 9781130140163
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 72
  • Series Title: English
  • Weight: 145 gr
  • ISBN-10: 1130140164
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 4 mm
  • Width: 189 mm


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