Chemical Engineering Volume 16

Chemical Engineering Volume 16

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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. 1917 edition. Excerpt: ... in the use of fuel. It is sometimes not necessary to introduce any extraneous heat before the middle of the kiln is reached, and then force the roasting as fast as possible by increasing the heat to the discharge end of the kiln. In either of the above cases it is well to retain a good heat in the kiln for about 20 ft. near the discharge end. The writer's experience has been that a certain percentage of the sulphur left in the roasted ore is nearly always in the form of sulphate. The fact should, therefore, be kept in mind that it is immaterial how the sulphates are formed, or how much the ore is rabbled, or how long it remains in the kiln; the sulphates will not be broken up if the necessary heat is not provided. Third Class.--Under this class would be considered the dust from dry concentrating plants and slime from wet mills. This class of material is dreaded by the metallurgist, both in roasting and in the distillation of zinc, and he rarely attempts treating it alone but mixes it with concentrates or crushed lump ore before roasting. Dust and slimes are not only objectionable due to their fineness, with consequent high dust loss, but they nearly always carry considerable lead, lime, etc, which add to the difficulties of roasting and distillation. It would be more satisfactory, at least metallurgically, if the dust and slimes could be converted directly into a pigment. This is done to a certain extent, but due either to the commercial difficulties or to the losses of silver and gold, only a part of such material is now handled in this manner. EFFECT OF UNROASTED SULPHUR ON ZINC RECOVERY In considering the sulphur left in the roasted zinc ore it is customary at the plants to determine what is termed "faulty" sulphur ( more

Product details

  • Paperback | 694 pages
  • 189 x 246 x 35mm | 1,220g
  • United States
  • English
  • black & white illustrations
  • 1236846001
  • 9781236846006