Silver recovery method

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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75 05A, 75108, 75118R, 423 27, 423 34, 423371, C22B 1104

Patent

active

042182425

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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Thorpe, Dictionary of Applied Chemistry, 4th Edn., vol. X, Longmans, Green & Co., N.Y., N.Y., 1950, p. 756.

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