SEPARATION OF COBALT(II) AND NICKEL(II) IONS FROM ACID AQUEOUS SOLUTIONS BY Co IT ION-EXCHANGE INTO ?-TITANIUM PHOSPHATE
- 1 January 1995
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 13 (1), 179-187
- https://doi.org/10.1080/07366299508918268
Abstract
The Co2+-2H+, Ni2+-2H+, and Co2+-Ni2+-2H+ ion exchange processes into γ-Ti(H2PO4)(PO4)2H2O were studied. Exchange isothenns and titration curves were obtained. Monometallic half ion exchange phases were formed by using MC2+HCl (M=Co,Ni) solutions. Equilibrium constants, free energy, enthalpy, and entropy of the Co2+-2H2+ ion exchange reaction were determined. In (Co,Ni)Cl2 solutions, bimetallic a half ion exchange substitution solid solution is detected. Equilibrium constant of the Co2+-Ni2+ substitution process in the γ-Ti(CoxNi0.5−x.HPO4)(PO4)nH2O phase at 85°C was determined. In (Co,Ni)Cl2+HCl solutions, total separation of Co2+ and Ni2+ is obtained.Keywords
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