Bulletin Volume . 207-213

Bulletin Volume . 207-213

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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. 1922 edition. Excerpt: ...created in the furnace, and the fume drawn through this rather elaborate system of washers by a vacuum pump connected to the back of the oakum box. A vacuum of 1 to 4 inches of mercury, according to the height of water in the "zinc box," was required for the suction of the gases through the plant. A careful test was made on a parcel of ore put through the small furnace, which ran continuously for 83 hours. The test was watched by Messrs. W. A. Macleod and W. B. Blyth, representatives of Bewick Moreing, and Mr. Harley Wright, representing Hooper & Speak. All parties reported this small plant to be quite successful. The volatilization of the gold over this period averaged 92 per cent, according to the assays of the headings and residues; and the gold actually recovered was within a few per cent of this figure. More could not be expected from an experimental furnace working on such a small lot of ore. The favorable results that were obtained in this small installation led to the construction of a large plant, which, according to Mr. Howe, was as follows: We found one or two accessories in the plant that worked well, and noted others to be avoided. Our furnace was 5 feet in diameter by 27 feet long. It should have been 45 or 50 feet for this diameter. Our furnace was red hot even at the cool end, so that the heat losses were excessive. The greater length would not only have conserved the heat better, but by giving a greater length in which to roast the ore would have increased the capacity of the furnace. In the 27-foot furnace the first 12 feet were taken up by the ore roasting, leaving only 15 feet for the volatilization. This meant that we had to run with too thin a layer of ore. For the number of times that a given amount of ore is...
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Product details

  • Paperback | 382 pages
  • 189 x 246 x 20mm | 680g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236491181
  • 9781236491183