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The Assayer's Manual. an Abridged Treatise on the Docimastic Examination of Ores, and Furnace and Other Artificial Products

The Assayer's Manual. an Abridged Treatise on the Docimastic Examination of Ores, and Furnace and Other Artificial Products


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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. 1889 Excerpt: ...the residue. 6. Nickeliferou s solution from the assay with sulpho-cyanide for determining coliper in nickel coins.--In order to decompose the sulpho-cyanide, the solution is evaporated with the addition of 10 cubic centimeters of nitric acid, which will cause the fluid to become first red, and then colorless. The nickel is precipitated by pouring the nickeliferous liquid into a boiling solution of 100 cubic centimetres of sodium hydrate, 10 per cent. strength, which is boiling in a platinum evaporating dish. It is allowed to boil, then diluted with water, and again heated to the boiling point. It is allowed to settle, and then decant through a filter. The precipitate is again boiled three times, each time with 200 cubic centimeters of water, and then filtered. The precipitate is dried, heated to redness, and rubbed fine, again washed with boiling water, dried, ignited, and the nickel determined from the nickel protoxide1 (now free from alkali) with 78.38 per cent. nickel. Inaccurate results will follow if less, or less concentrated, sodium hydrate is used, or if the washing is continued too long, as under these circumstances some nickel is dissolved as hydrated oxide. B. Volumetric assay with sodium sulphide.1--The copper which may be present is removed by means of sulphuretted hydrogen, and its percentage determined by the potassium cyanide (p. 120). The filtrate from the precipitation with sulphuretted hydrogen is evaporated with nitric acid, and the iron precipitated with ammonia. The precipitate is dissolved twice or three times, and again precipitated with ammonia (the methods with ammonium sesquicarbonate or with sodium acetate (p. 201) give a more accurate separation); a standard solution of sodium sulphide, 50 cubic centimeters of which precipitate...


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Product Details
  • ISBN-13: 9781153601634
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 132
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 115360163X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 249 gr


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