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Copper Smelting Volume 26

Copper Smelting Volume 26


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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. 1885 Excerpt: ...some 4 to 8 per cent, of iron in the resulting matte, while the slag contains from 3 to 5 percent, of copper. We aim at a product approximating the composition of disulphide of copper with, say, 71 to 75 per cent, copper. If it were much leaner in copper it would be difficult to bring it forward to the condition of blister copper in the succeeding operation. It should not be much richer than 75 per cent, copper, since any excess of copper above that required to combine with the available sulphur present (part of the sulphur is appropriated by the iron and other metals present) to form disulphide of copper (Cu2S) would precipitate out in the metallic state, carrying with it most of the arsenic, antimony, and gold, creating thus an additional product whose treatment complicates the process, and a considerable part of which works down into the sand hearth, causing a heavy lockiug up of very impure copper. That part of the metallic copper thus precipitated which is not absorbed by the hearth will, on tapping the charge, accumulate in the bottoms of the molds nearest the furnace, through which the matte passes on its way to those farther off, the molds communicating with each other by slight depressions in the tops of the sand partitions which separate them. It is hence called copper bottoms. If it be desired to thus eliminate the arsenic, antimony, and gold in bottoms it is in general better to do so after performing the additional fusion of the extra process, since this additional fusion itself expels a large amount of arsenic and antimony, so that both the resulting matte and the bottoms accompanying it are freer from these noxious elements. It is sometimes, however, considered desirable to separate bottoms in the first fusion of the roasted "coarse meta...


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Product Details
  • ISBN-13: 9781155495811
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1155495810
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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