CHEMICAL PRECIPITATION OF IRON SPECIES FROM DILUTED FERRIC AQUEOUS SOLUTIONS

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.