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: ...insoluble in matte. While matte analyses usually show the presence of some slag, this can be separated by raising the temperature of matte to say 1500 C. New Process.--H. Hof and B. Rinck patented (German patent No. 227,389) a process for the extraction of PbO and PbS04 from lead drosses. Lead oxide is readily soluble in a hot concentrated solution of MgCl2 forming the salt 2MgCl2PbCl2, while the H2Mg02 formed combines with the excess MgCl2 to an oxychloride. The dissolved 2MgCl2.PbCl2 readily separates upon cooling the solvent. The PbS04 is similarly dissolved in boiling MgCl2 forming the same double chloride as the PbCl, the resulting MgS04 falls out in part with the double chloride upon cooling, and is later removed by treatment with warm water. Condensation.--C. Guillemain has published a small book entitled, "Theorie und Praxtis der Staubverdichtung und der Reinigung und Entstaubung von Gasen," Knapp, Halle a/S., 1911, pp. 54, 8, S0.70. This book which is to treat of the theory and practice of condensation, the purification of gases, and the separation of suspended dust, has a few general considerations of the subject as a whole, which are followed by a compilation of the German patents granted. It may be of use to anybody wishing to take out a patent in Germany; the metallurgist will put it aside for possible reference. In the dry condensation of flue dust (Rzehulka, Zeitschrift fur angew. Chemie, 1911, XXIV, 1803) the two leading steps taken are the cooling of the gas and the retardation of its velocity. As the mutual attraction of particles decreases with the square of distance, cooling, which diminishes the volume of gas, will bring the particles more closely together, and increase the mutual attraction, with the...show more

Product details

  • Paperback | 388 pages
  • 189 x 246 x 20mm | 689g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236782194
  • 9781236782199