Mostafa Aghazadeh-Ghomi, Javad Moghaddam
The selective precipitation of zinc from zinc−nickel sulfate solution with a Zn/Ni molar ratio of 20:1 was studied. Dropwise addition of 0.5 mol/L NaOH solution into the zinc−nickel sulfate solution containing varying concentrations of ethylene diamine tetraacetate (EDTA), a chelating agent, was employed. The equilibrium analysis of the precipitation pathway was performed using the Visual MINTEQ program. Results indicated that the presence of small amounts of EDTA could effectively prevent nickel precipitation in alkaline conditions without negatively affecting zinc precipitation. As a consequence, more than 90% of zinc could be precipitated as a product with about 50% Zn and only 0.11% Ni at pH 9.0, solely due to the presence of 0.03 mol/L EDTA in the solution. Additionally, a stirring time of 120 minutes post-precipitation was determined to be essential for achieving more complete separation. X-ray diffraction studies on the precipitate confirmed that the precipitated phase was Zn4(OH)6SO4·4H2O.
@article{b3bbc339-db32-449e-b3cb-15b8bb3b8789,
title={Enhanced selectivity of hydrolytic preci},
author={Mostafa Aghazadeh-Ghomi and Javad Moghaddam},
year={2026},
language={en}
}TY - JOUR TI - Enhanced selectivity of hydrolytic preci AU - Mostafa Aghazadeh-Ghomi AU - Javad Moghaddam PY - 2026 LA - en ER -
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