Machinery for Metalliferous Mines; A Practical Treatise for Mining Engineers, Metallurgists and Managers of Mines

Machinery for Metalliferous Mines; A Practical Treatise for Mining Engineers, Metallurgists and Managers of Mines

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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. 1894 edition. Excerpt: ...and alkalies only serve to precipitate verdigris after a few days, or form salts of copper, which pop off only to return as an oxide, with tenfold power and quantity. In brushing the plates, a weak solution of cyanide of potassium (in case of heavy concentrates) and concentrated lye (weak) in case of grease on the plates may be used. 365 CHAPTER XX. THE MILLING OF SILVER ORES. Free Milling Ores--Roasting Milling Ores--Combination Process--Wet Crushing Silver Mill--Specification for io-Stamp Wet Crushing Mill--Power and Water Required--The Working of the Mill--Amalgamating Pans and Settlers--Blanket Tables--Sand Sluice--The Boss Continuous Process. The ores of silver, like those of gold, are divided, for milling purposes, into two general classes: (a) Free milling ores, or those which can be amalgamated direct after pulverisation; and (6) Roasting ores, which, before amalgamation, require a preliminary roasting. The free milling ores are crushed in a wet, and the roasting milling in a dry state. Free Milling Ores.--The minerals which contain the silver in such a form, that it can be brought into contact with, and amalgamated by, mercury, either with or without the aid of chemicals in the amalgamating pans, are those best suited for the free milling process, and are those which contain native silver, chloride of silver, and sulphide of silver in certain forms. On the other hand, those silver ores which are mixed with the sulphides of iron, copper, lead, zinc, and antimony, are not adapted to a free milling process, owing to the presence of the base metals interfering with the amalgamation, either by setting up chemical reactions of their own, and so fouling the mercury, or through their being combined with the silver in such a way that...
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Product details

  • Paperback | 196 pages
  • 189 x 246 x 11mm | 358g
  • United States
  • English
  • black & white illustrations
  • 1236741943
  • 9781236741943