Funct. Mater. 2022; 29 (4): 597-604.

doi:https://doi.org/10.15407/fm29.04.597

Co-precipitation of cations of zinc and divalent metals from phosphoric acid solutions

N.M.Antraptseva, N.V.Solod, O.D.Kochkodan, O.O.Kravchenko

National University of Life and Environmental Sciences of Ukraine, 17 Heroiv Oborony Str., 03041 Kyiv, Ukraine

Abstract: 

It has been established that the joint pairwise deposition of cations Zn2+ and M2+ (M2+ = Mg2+, Mn2+, CO2+) in the systems ZnCl2-MIICl2-(Na2HPO4, Na2HPO4:Na3PO4, Na3PO4 or (NH4)2HPO4)-H2O (MII = Mg, Mn, Co) is accompanied by the formation of a phosphate-matrix - Zn3(PO4)2·4H2O - substitutional solid solutions with general formulas Zn3-xMgx(PO4)2 ·4H2O, Zn3-xMnx(PO4)2 ·4H2O, Zn3-xCox(PO4)2 ·4H2O, 0<x≤1.00. It has been shown that for the use of an alkaline precipitant - Na3PO4 - the regions of homogeneity of the solid solutions expand, but the time of reaching equilibrium increases. In the case of other precipitants, the duration of crystallization is reduced, the boundaries of solid solution formation are more clearly fixed, but the degree of cation substitution in the phosphate matrix structure is narrowed. For the systems studied, a diagram of residual concentrations, which can be used to predict the formation of solid solutions during co-precipitation of cations in unexplored phosphoric acid systems, has been proposed.

Keywords: 
co-precipitation, solid solution, precipitator, phosphates.

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