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Abstract
The main objective of the work presented in this thesis is to study
the extraction and separation of Zn(II), Fe(II), Fe(III) and Cd(II) from
aqueous chloride solutions by solvent extraction technique using three
organophosphorus extractants namely; TBP, CYANEX 921 and CYANEX
923. Different parameters affecting the extraction processes has been
studied in terms of shaking time, hydrochloric acid, hydrogen ion, chloride
ion, extractants, metal concentration, loading capacity, phase ratio,
temperature as well as stripping investigation. The results obtained show
that the extraction process increases with hydrochloric acid, hydrogen ion,
extractants, metal concentration and phase ratio for the three investigated
systems. The thermodynamic parameters and equilibrium constants were
calculated for each element. The extraction of Fe(II) by the three
extractants was poor.
Application studies were developed for the recovery of zinc from pickling
solution resulting from hot dipping galvanizing bath using undiluted TBP,
CYANEX 921 and CYANEX 923 in kerosene extractants. The obtained
results show that TBP is the most promising extractant among the three
investigated extractants.