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Distribution of trace amounts of impurities during nickel(II) nitrate crystallization

Smolik M.

Polish Journal of Chemistry

1999

vol. 73 nr 3

425-430

Distribution coefficients, D, of trace amounts of impurities (Mg2+, Co2+, Zn2+, Cd2+, Cu2+, Mn2+, Ca2+, Sr2+, Ba2+, and Pb2+) have been determined during crystallization of Ni(No3)2×6H2O. Their dependencies on the ionic radii of M2+ ions, solubilities and structures of the corresponding nitrates as well as their abilities to form solid solutions with Ni(NO3)2×6H2O have been analyzed. The D values are comprised in the range 0.011(DSr)-0.40(Dco) and depend neither on solubilities in water of corresponding nitrates nor similarity of their crystal structure. These coefficients generally decrease when the difference between ionic radii of macrocomponent and microcomponent becomes larger, but this dependence is disturbed by relatively high values of Dco and DZn, resulting from the ability to form solid solutions Ni(Co)(NO3)2×6H2O and Ni(Zn)(NO3)2×6H2O. The solubility of macroamounts of cobalt(II) and zinc(II) nitrate haxahydrates in the solid phase )Ni(NO3)2×6H2O) is the main factor influencing their distribution coefficients.