Removal of iron and formation of copper(i) from solutions containing iron(ii) and copper(ii) by addition of chloride ion or acetonitrile
Muir, D.M., Benari, M.D., Clare, B.W., Mangano, P. and Parker, A.J. (1983) Removal of iron and formation of copper(i) from solutions containing iron(ii) and copper(ii) by addition of chloride ion or acetonitrile. Hydrometallurgy, 9 (3). pp. 257-275.
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Solutions of Cu(II) and Fe(II) establish the redox equilibrium Cu(II) + Fe(II) ⇌ K Cu(I) + Fe(III) which is displaced to the right by addition of either Cl- or acetonitrile (AN). Log K varies from -10.5 in water to about -2.5 in 4 M NaCl or AN, allowing iron to be removed selectively from copper (II) solutions either by solvent extraction with Versatic acid or by precipitation as goethite or j jarosite. To establish the required conditions Eh-pH diagrams have been developed for the CuH2OCl and CuH2OANSO4 2-systems at 25°C and 90°C. It is demonstrated that the catalytic effect of Cu(II) on the oxidation of Fe(II) to Fe(III) by O2 is dependent on the concentration of Cl- or AN and on the position of this redox equilibrium. Applications to removing iron from hydrometallurgical solutions are discussed and tested.
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