Metallurgical apparatus – Means for treating ores or for extracting metals – By means precipitating metal from solution
Patent
1979-11-01
1980-09-02
Ozaki, G.
Metallurgical apparatus
Means for treating ores or for extracting metals
By means precipitating metal from solution
266101, 266168, 75105, 75108, 75118R, 423 23, 423371, C22B 1104
Patent
active
042203201
ABSTRACT:
A silver recovery method and apparatus performing highly specific separation of silver from source material containing organic and inorganic materials, including transition metals, comprising the steps of digesting source material with nitric acid solution to form an acidic reaction mixture; thereafter adding increments of sodium or potassium cyanide solution to the separated liquid phase of the reaction mixture; discontinuing addition of cyanide solution when silver(I) cyanide precipitate ceases to form after incremental additions of cyanide solution; and separating silver(I) cyanide precipitate of high purity from the liquid phase of the reaction mixture.
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Scott, Standard-Methods of Chemical Analysis, 5th Edn., (1939), vol., p. 823.
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