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A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc Volume 4

A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc Volume 4


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About the Book

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. 1902 edition. Excerpt: ...to accomplish desilverization, refining, and casting with only one kettle. The casting itself is conveniently accomplished by means of the siphon constructed of iron pipe a, shown in Fig. 32. The molds b are arranged in a semicircle below the kettle; the siphon is plugged and filled with molten lead while in an inverted position, then put in the position shown, and opened when the flow of lead will begin. The longer limb of the siphon terminates in a swinging arm, whose length is equal to the radius of the semicircle in which the molds have been arranged. Without checking the flow of molten lead at any time, the molds are filled in succession and each one is skimmed as soon as filled by the molder, who removes any dross or dirt from the surface by means of two pieces of shingle. In this way clean pigs of lead are produced, and the whole operation can be easily managed by one man who skims the lead in one mold while the next is being filled from the siphon. Before the last of the molds in the semicircle has been filled, that which was first cast has solidified and has been cooled by water thrown on from a hose; the pigs of lead are rempved as fast as cooled, and when the end of the semicircle has been reached the first molds are again ready to be filled, so that the operation may be carried on without noticeable interruption. Dip samples are taken for assay, as in the case of casting base bullion in a similar manner. 93. Treatment of Crusts.--The average weight of the crusts obtained by desilverization of the base bullion is usually less than 10 per cent. of the total weight treated. Practically all the silver from a 30-ton charge of base bullion containing 300 ounces of silver to the ton is contained in the crust, which will have a value...


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Product Details
  • ISBN-13: 9781235887741
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 154
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 123588774X
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 286 gr


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