Refining copper by the acetonitrile process
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The Eh-pH diagrams, solubility and redox potentials of Cu, Ag, As, Sb, Bi, Pb and Fe are compared in concentrated aqueous chloride and sulfate solutions and in sulfate solutions containing acetonitrile. It is shown that the significant differences in the chemistry of these elements account for the differences in the purity of copper produced from chloride and sulfate electrolytes.
A sample of crude copper crystals produced by the CLEAR Process was refined by dissolution and recovery in sulfate media using the Parker acetonitrile process. The Parker process offers an alternative method of copper recovery to electrorefining, and allows a range of Eh and pH conditions to be used to provide further discrimination of impurities. High-purity copper powder was obtained even in the presence of added impurities when Eh and pH were maintained near 300 mV and 1, respectively, during the refining step.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
|Copyright:||© 1985 Published by Elsevier B.V.|
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