Transactions of the Electrochemical Society Volume 24

Transactions of the Electrochemical Society Volume 24

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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. 1914 edition. Excerpt: ...chromium so as to prevent any final lowering of the percentage of chromium in the alloy. As the carbon is oxidized, so is the silicon, down to 0.2 percent, from 2 to 5 percent in the crude alloy. Aluminum is also considerably eliminated, and phosphorus and sulphur are reduced to a slight degree. Although the market is small for very low-carbon ferrochrome, the difference in price between the alloy with 9 percent carbon and the 0.5 percent product does not seem warranted. The refining expense is almost entirely in power, and with cheap power, as is generally the case at a ferro-alloy plant, the expense is not as high as $300 per ton, the difference in price of the products mentioned. Processes which have been tried out, based upon the use of silicon or some reducing agent other than carbon, have not been commercially successful because of the much higher cost of such reducing materials as silicon, ferrosilicon and aluminum over that of carbon. Also the products may be contaminated with the reducing material, just as when carbon is used, so that a subsequent refining is necessary. Carbon-free ferrochrome for high-grade steels has, however, been successfully made by the thermit process, but the amount made in this way is comparatively small. Experimental Smelting of Chromite in the Eleetric Furnace. Some experiments were made by the writer in 1912 on the production of ferrochrome from chromite with carbon as a reducing agent. The experiments were performed in a furnace lined with magnesite, having one upper graphite electrode and a conducting hearth of iron rods imbedded in magnesite. The interior dimensions of the crucible were 4 inches wide, 8 inches long and 8 inches deep (10 x 20 x 20 cm.). This furnace took from 8 to 12 kilowatts more

Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • United States
  • English
  • black & white illustrations
  • 1236875060
  • 9781236875068