The Chemistry of Cyanide Solutions Resulting From the Treatment of Ores
The Chemistry of Cyanide Solutions Resulting From the Treatment of Ores
J E John Edward Clennell
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The end-point in presence of the iodide is slightly affected by dilution, but is not altered by the presence of alkali. The average of a large number of experiments showed that 3.5 are consumed (or at least rendered incapable of reacting with silver nitrate in presence of KI) for every part of copper dissolved, when the copper salt is prepared with precautions to prevent loss of cyanogen. A tentative explanation of these reactions may be based on the assumption that cuprous cyanide, Cu 2 Cy 2 ,... forms molecular com- pounds with KCy. Thus we may suppose the reaction of cyanide on cupric hydrate to be as follows: 2Cu(HO) 2 + 7KCy = 5KCyCu 2 Cy 2 + 2KOH. When silver nitrate is added to the solution of this double salt, a portion only of the combined potassium cyanide is capable of re- acting to form the soluble double cyanide of silver: 4(5KCyCu a Cy 2 ) + 3AgtfO = 3KAgCy 2 + 3KNO, + 2(7KCy2Cu 2 Cy 2 ). When potassium iodide is present, this reacts forming silver iodide before any of the copper salt is decomposed.
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