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Cyanide Processes: (English)

Cyanide Processes: (English)

          
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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: In the case of zinc sulphate: ZnS04 ] 4KCN = K2Zn(CN)4 + K2SO4; Zn:4KCN 65: 260 =1:4. In the case of copper sulphate: 2CuSO4 + 4KCN = K3Cu(CN)4 + K2SO4; Cu:4KCN 126: 260 =1:2. There are many reactions which occur in the cyanide process not yet understood, for which reason the scope of the process is still narrow. Probably the widest field for cyanide extraction is yet to be developed, but at present its distinctive field lies in the treatment of tailings. Salts of aluminium and magnesium act in a different manner with potassium cyanide, their hydrates being formed with the liberation of hydrocyanic acid, thus: A12(SO4)3 + 6KCN + 6H2O = A12(OH)6+3K2S04 + 6HCN; MgS04+2KCN+2H20 = Mg(OH)2+K2S04+2HCN. A preliminary alkaline treatment overcomes this objectionable feature, their hydrates being precipitated, which are then inert towards potassium cyanide, thus: MgS04 + Ca(OH)2 = Mg(OH)2 + CaSO4; insoluble magnesium hydrate and insoluble calcium sulphate being formed. Soluble sulphides, formed by the action of potassiumcyanide on some metallic sulphides, again react to some extent on the cyanide, with the formation of sulphocyanide of potassium, thus: ZnS + 4KCN = K2Zn(CN)4 + K2S; K2S + KCN + H2O + O = 2KOH + KCNS. To determine the cause of the consumption of cyanide place 100 grams of the pulp in a wide-mouthed bottle, add 200 c.c. of the cyanide solution and agitate for fifteen hours. Filter, take 20 c.c. of the nltrate (equivalent to 10 grams of ore) and evaporate almost to dryness in a porcelain dish. Add some strong sulphuric acid, evaporate almost to dryness, and cool. Dilute with water, add some hydrochloric acid, and heat to effect solution if necessary. The metal in solution may now be determined by the usual methods. The strong sul...


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Product Details
  • ISBN-13: 9780217825856
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 62
  • Series Title: English
  • Weight: 127 gr
  • ISBN-10: 0217825850
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 189 mm


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