Metallurgy of Gold, Silver, Copper, Lead, and Zinc Volume 1

Metallurgy of Gold, Silver, Copper, Lead, and Zinc Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: the same way as the amalgamating barrel shown in Fig. 2, but is unlined, and not so large--being usually 3 feet in diameter and 4 feet long. The amalgam and mercury are charged into the barrel; the barrel is then nearly filled with water, closed, and revolved for several hours at about 20 revolutions a minute. Scrap iron is sometimes added, but this flours the mercury and does not materially assist the operation, and its use is now being generally abandoned. At the end of the agitating period the barrel is opened and washed out with water--the tailings being run over amalgamated plates or through some other form of amalgam saver--while the amalgam in the barrel is removed, strained, and retorted.. 10. Barrel Ama1gamation.--The Freiburg, or barrel, process of amalgamation is not much used in America. A few attempts at barrel amalgamation have been made, but in most cases they have given way to the pan process, which is somewhat quicker, and by most metallurgists considered superior to the barrel process. However, a description of the barrel and a brief outline of the process will be given. 11. The Barre1.--The amalgamating barrel is cylindrical in shape, usually about 4 or 5 feet long inside and the same in diameter. Fig. 2 shows one form of barrel. Some barrels have a replaceable lining of wooden blocks, about 5 inches square and 3 or 4 inches thick, set on end, as shown in the illustration; this lining can be replaced when it wears out, and the barrel will last indefinitely. The barrel is made of soft pine staves, 2 or 3 inches thick, bound together with iron bands; and the joints between the.planks forming the heads are grooved and fitted with tongues of hard wood. When the barrel is not lined, the staves are from 4 to 6 inches thick...
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Product details

  • Paperback | 124 pages
  • 189 x 246 x 7mm | 236g
  • United States
  • English
  • black & white illustrations
  • 1236745140
  • 9781236745149