Transactions of the American Institute of Mining Engineers Volume 32

Transactions of the American Institute of Mining Engineers Volume 32

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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 silver by a solution of sodium hyposulphite. I took a ton of ore so prepared, and worked it with mercury only, as the silver was already converted into chloride, and there was no need of chemicals to chloridize it. After a month's treatment there appeared no trace of amalgamation. I then added the usual amounts of salt and bluestone. There was an immediate change in the appearance of the mercury, which became coated with a gray, opaque film; but, notwithstanding this, it did not catch any silver; and when washed out, after two months' treatment, half the weight of the quicksilver had been lost, and the remainder contained very little--almost nothing--of silver. 4. If there were really, in the patio, a formation of chloride of silver, subsequently reduced by the mercury, the loss of mercury should be 1.85 times the weight of the silver obtained. This is not the case. In the majority of instances the total loss of quicksilver, including the inevitable waste in the several manipulations, is between 1.25 and 1.5 times the weight of silver obtained. 5. In the caso, as well as in the Freiberg barrel-process, where the ores contain silver in the state of chloride, either natural or artificial, the loss of mercury is very small, say from 5 to 10 per cent, of the silver, because in those processes the reduction of the chloride is effected by the metallic copper or iron; but when those metals have been tried on the patio, the result has been negative. In this respect Mr. Uslar says: "The object of another series of experiments was to protect the quicksilver by means of metallic copper and iron, but the results were entirely different from what we expected. Where there was iron there was no amalgamation; a small quantity of copper seemed to...show more

Product details

  • Paperback | 336 pages
  • 189 x 246 x 18mm | 599g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236957873
  • 9781236957870