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- W2015367992 abstract "By using data published by others, a mathematical model has been developed for the early kinetics of precipitation of Fe(OH)3−xAx and the time evolution of the resulting particle-size distribution caused by alkalinization of Fe(III) salt solutions; A is either Cl− or NO3−. The principle of the model is represented by the formation equations of active centers of particle growth and of the continuity of changes in the state of particle-size distribution resulting from attachment and detachment of hydroxy complexes. The computational experiment has shown that hydrolysis becomes salient after a certain induction period after which a process develops according to an S-like dependence on time. Data on the duration of the induction period, on the maximal hydrolysis rate, and on the final distribution function of hydroxide species according to size allow us to determine the function parameters of the equations of the kinetics of Fe(OH)3−xAx particle growth. The results of the computational experiment of the calculation coincide with the experimental data in literature on the distribution of the hydroxide species according to size. The results were obtained by using electron microscopy. It has been recognized that the active centers (critical nuclei) of hydroxide formation are the tetramers [Fe(OH)3]4 which grow as a result of attachment of the mononuclear hydroxy complexes. The properties of the species in nitrate and chloride solutions are similar. The rate of formation of the active centers in those solutions at a temperature of 298 K, a concentration of solution Fe(III) of 102 moles/m3, and a molar ratio OHFe = 2 equals 1.7 × 1020 m−3 s−1; the linear rate of the species' growth is 3 × 10−13 m s−1." @default.
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- W2015367992 date "1987-05-01" @default.
- W2015367992 modified "2023-09-27" @default.
- W2015367992 title "Kinetics of hydroxide Fe(III) solid phase formation" @default.
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- W2015367992 doi "https://doi.org/10.1016/0021-9797(87)90162-7" @default.
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