The Mineral Industry Volume 20

The Mineral Industry Volume 20

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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. 1912 edition. Excerpt: ...bags, 10 ft. long and 8 in. diameter. The filtered gas passes the turn-stile damper G into pipe D and through fan E, which delivers it into the outlet pipe F. After traveling in this direction for about 4 minutes, the damper G is turned mechanically to occupy the second position, shown by the dotted line, when the back pressure from the outlet pipe F forces cleaned gas through pipe J with its heated chamber, and thence through the outer surface of the bags; the dust gathered on the inside is loosened, the bags are shaken by the mechanism H, and the dust drops into the hopper K to be discharged at intervals. This cleaning takes from 15 to 20 seconds. By means of the device a small filtering surface can handle a large volume of dust-laden gas, and recover the dust automatically. Cottrell Electric Condensing Process.--A radical departure from the usual methods of condensation is the Electric Precipitation Process of F. G. Cottrell (Jl. Ind. Eng. Chem., 1911, III, 542; Eng. Min.Jl., 1911, XCII, 763; Min. Scientific Press, 1911, CIII, 255, 286; Min. Science, 1911, LXIII, 337, LXIV, 350, 364; Eng. News, 1911, LXVI, 495) in operation at the Selby Lead Works near San Francisco, and the Balaklala copper smeltery, Coram, Cal. Experiments by Lodge and Walker have shown that an alternating current will cause the agglomeration of particles suspended in a fairly quiescent atmosphere. In a moving gas current agglomerating and settling are too slow to be effective. Cottrell therefore uses a high-potential direct current. If one pole of such a current is connected with a needle-point, and the other with a flat plate, the air space between the two becomes highly charged with electricity of the same sign as the needle-point, and any insulated body brought...show more

Product details

  • Paperback | 406 pages
  • 189 x 246 x 21mm | 721g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236908457
  • 9781236908452