Leaching of silver with copper(ii) ions in aqueous acetonitrile solutions: solubility of salts and equilibrium constant measurements in sulphate media
Avraamides, J., Baird-Trotter, R. and Hoecker, W (1986) Leaching of silver with copper(ii) ions in aqueous acetonitrile solutions: solubility of salts and equilibrium constant measurements in sulphate media. Hydrometallurgy, 15 (3). pp. 351-362.
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Silver metal may be oxidised by copper(II) ions in acidified aqueous acetonitrile. The extent of reaction was shown to be directly related to the proportion of acetonitrile in solution and to the sulphuric acid concentration up to about 5% v/v. The solubility of silver sulphate was measured in a variety of acetonitrile—water compositions containing varying amounts of sulphuric acid. Increasing temperature had little effect on either equilibrium constant values or solubility of silver sulphate in the range 25–50°C.
Suitable leaching conditions were defined from the data collected and a process flowsheet in proposed for the recovery and refining of silver. Silver powder can be obtained from the leach solutions via distillation to remove the acetonitrile.
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|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
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