Dental Metallurgy

Dental Metallurgy

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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. 1917 edition. Excerpt: ...to be timbered so as to prevent caving in; several ways of egress are also constructed; the drip water is drained and also by properly placed fans the air is kept in constant circulation. The ore is blasted from place and then carried to the surface. It is then dressed and concentrated and sent to the smelters or refineries. Recovery of Gold from its Ores.--The methods of recovery of gold from its ores may be classed as follows: 1. Extraction by simply washing. 2. Extraction in the dry way. 3. Extraction in the wet way. 4. Extraction by electrolysis. 5. Extraction by wet and dry methods. Simple Washing.--Extraction by simply washing is effected by dressing gold-bearing sands, gravels, or ores. Dry Method.--Extraction in the dry way consists of converting the gold into gold-lead, or gold-lead-silver alloy and cupelling it. This method is used in extracting gold, when present in small but paying quantities in other ores, such as iron-lead and gold-bearing furnace products from other metallurgical reductions. Wet Methods.--Under this heading there are three distinct processes: (1) Amalgamation process. (2) Chlorination process. (3) Cyanide process. Amalgamation Process.--The gold ore is treated with mercury and an amalgam of gold and mercury is formed. The amalgam usually contains silver, but is free from contamination of base metals. The mercury is boiled off, leaving a gold-silver alloy. A special process is necessary to free the gold from silver. Chlorination Process (Plattner or Percy Process).--This process consists of treating gold ores with watery solutions of chlorine. It is used to treat ores in which mercury has failed to recover all the gold present. The gold is dissolved as the chloride and is then precipitated from solution by the...show more

Product details

  • Paperback | 90 pages
  • 189 x 246 x 5mm | 177g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236547071
  • 9781236547071