Recovery of copper powder from copper concentrates and from solutions of copper(II) sulfates using sulfur dioxide and aqueous acetonitrile
Parker, A.J. and Muir, D.M. (1981) Recovery of copper powder from copper concentrates and from solutions of copper(II) sulfates using sulfur dioxide and aqueous acetonitrile. Hydrometallurgy, 6 (3-4). pp. 239-260.
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Copper concentrates can be sulfation roasted and leached with water to produce impure solutions of copper(II) sulfate. Copper sulfites are precipitated from aqueous copper(II) sulfate solutions with soluble salts of sulfurous acid like (NH4)2SO3 or Na2SO3. The water insoluble copper sulfites dissolve in acetonitrile—water (AN/H2O) and reduce Cu2+ to give acidic solutions containing up to 2.4 M Cu+ as Cu2SO4. Removal of acetonitrile by steam and disproportionation, gives up to 75 g pure particulate copper per litre of such solutions. Conditions for the recovery of Chevreul's salt from solution using different sulfite bases and for its dissolution in CuSO4/AN/H2O are determined. It is shown that both temperature and the molar ratios of Chevreul's salt and CuSO4 are important in the efficiency and stoichiometry of the dissolution reaction. Methods of separating copper and nickel from solutions of copper(II) and nickel sulfates, and of recovering copper from dilute (< 0.1 M) solutions of copper(II) sulfate, are suggested. A flow-sheet which combines these reactions and methods to recover copper from sulfation roasted chalcopyrite concentrates is proposed.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
|Copyright:||© 1981 Published by Elsevier B.V.|
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