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The Chlorination Process

The Chlorination Process


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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.1907 Excerpt: ... CHAPTER VIII. REFINING PRECIPITATES. To obtain the metal precipitated in a pure form, that it may be handled in bulk of a known value, it is reduced by heat, which operation is termed refining. The brown precipitate of gold produced by the action of ferrous sulphate upon the trichloride of gold is collected, washed on filter-paper, then treated with acid to remove any possible impurities, dried, placed in a graphite crucible with some flux--either soda or borax, and then placed in the furnace to melt. Gold bullion is said to be fine when absolutely pure; it is then termed i000 fine. To obtain such bullion requires an artist and very fine manipulation; to obtain it above 900 fine is not as difficult, especially from the precipitates of ferrous sulphate; but from the precipitate given by hydrogen sulphide the task is more difficult and the bullion less pure, ranging in fineness from 800 to 950, while in the former case it 92 may be obtained with less trouble from 950 to 990 fine. The reddish-brown precipitate of metallic gold obtained by this operation is washed with warm water and filtered to remove any acids or salts of iron present, or any other substances soluble. If insoluble salts of metals or substances are present, such as arsenic, zinc, copper, silver, sulphur, they can only be removed by acids to reduce them, and then evaporation and washing, or by an oxidizing roast, as practised at the commencement, but on a smaller scale, in a muffle. The gold precipitated by FeSO, is placed in a graphite crucible, and with a little borax added is introduced into the furnace. The oxygen is driven off by the heat, the gold gradually melting, while the borax forms a liquid slag upon the surface of the molten metal. This slag has absorbed the impurities which were n...


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Product Details
  • ISBN-13: 9781151371041
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1151371041
  • Publisher Date: 09 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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