The extraction of zirconium (IV) from aqueous HCl solution by binary
mixture TOA and Cyanex 923 using kerosene as diluent was studied. The effect of
parameters like aqueous phase acid concentration, extractant concentration,
chloride ion concentration, diverse ion effect, metal loading, nature of
diluents and temperature on the extraction of Zr (IV) was investigated. The
percentage of extraction of Zr(IV) became 100% with 0.1 M TOA and 0.01 M Cyanex
923 from 7 M HCl and also from 4 M HCl with 0.1 M TOA and 0.02 M Cyanex 923. Benzene
was found to be effective diluent for the extraction of Zr(IV) with binary
mixture of TOA and Cyanex 923. The positive enthalpy change and positive
entropy change in the binary extraction system show endothermic process with increase
in randomness. Stripping of Zr (IV) from the loaded organic phase containing
mixture of TOA (0.1 M) and Cyanex 923 (0.01 M) indicated that HNO3 and Na2CO3 are the best stripping agents.
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