CHEMICAL PRECIPITATION OF IRON SPECIES FROM DILUTED FERRIC AQUEOUS SOLUTIONS
G. RAMIRO ESCUDERO *
Institute of Research in Metallurgy and Materials, Universidad Michoacana de San Nicolas de Hidalgo, Ciudad Universitaria Edificio ”U”, Apartado Postal 888, C.P. 58000, Morelia, Michoacán, México
P. MARTÍN REYES
Center of Research in Materials and Metallurgy, Universidad Autónoma del Estado de Hidalgo, Estado de Hidalgo, México
C. FRANCISCO PATIÑO
Center of Research in Materials and Metallurgy, Universidad Autónoma del Estado de Hidalgo, Estado de Hidalgo, México
L. NOHEMÍ ORTIZ
Institute of Research in Metallurgy and Materials, Universidad Michoacana de San Nicolas de Hidalgo, Ciudad Universitaria Edificio ”U”, Apartado Postal 888, C.P. 58000, Morelia, Michoacán, México
*Author to whom correspondence should be addressed.
Abstract
The precipitation of iron oxides from aqueous media containing diluted ferric species was studied under controlled pH, temperature, and iron concentration. The experimental results show, under iron concentrations between 3 to 165 ppm, that ferric hydroxide is present at pH values ranging between 0.6 to 13, while the aqueous univalent ferrous hydroxide at a pH values between 7 and 9.3, and the ferrous hydroxide appears in the pH range among 4.15 and 13.
The chemical precipitation of iron species cause changes in some of the physicochemical properties of the experimental media; it is concluded that the ionic strength affects the zeta potential values, the electrical conductivity of the liquid media, pH, and its surface tension.
Keywords: Iron oxides, chemical precipitation, ionic strength, zeta potential, electrical conductivity