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The Practical Assayer, Containing Easy Methods for the Assay of the Principal Metals and Alloys, Principally Designed for Explorers and Those Interest

The Practical Assayer, Containing Easy Methods for the Assay of the Principal Metals and Alloys, Principally Designed for Explorers and Those Interest


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 Excerpt: ...is boiled to expel the ammonia, and the liquor saturated with muriatic or sulphuric acid, and the copper precipitated by iron in the usual way. The only difficulty which occurs in this case is that in the filtration of the ammoniacal liquor, small white particles of oxyde of tin pass through the filter. But this may be avoided by adding two or three grains of lead to the solution before the addition of the ammonia. Tin may contain copper, lead, iron, and arsenic. To determine the lead and copper, the piece of tin must be flattened out, and treated with nitric acid at boiling point, until it is completely oxydized. The liquor is evaporated to dryness, filtered, and the residue calcined. If this residue is white, it consists of pure tin; but if iron is present, the residue is tinged more or less yellow. The nitric solutions are evaporated to dryness in rotation, and the residue calcined in a platinum crucible: this residue is again dissolved in pure nitric acid. The lead is precipitated from the solution by sulphuric acid, and afterwards the copper by a plate of iron. To determine the quantity of iron and arsenic, another portion of tin is dissolved in muriatic acid, and the operation proceeded with as before. When the tin does not contain lead, we can attack it by concentrated muriatic acid, to dissolve the tin and iron; but it is necessary to stop the action of the acid before all the assay piece is dissolved, or otherwise the copper i would be dissolved at the same time. The residue is well washed, and treated with nitric acid, &c. The copper and the iron can thus be determined at one and the same time. ASSAY OF TIN BY THE BLOWPIPE. Galin's well-known method, by which the most minute traces of tin can be discovered, is as follows: A small portion of th...


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Product Details
  • ISBN-13: 9781151843258
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1151843253
  • Publisher Date: 19 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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