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The solubility of Fe_2O_3 in dilute KOH and HClO_4 aqueous solutions was determined at 300℃ and 10 MPa. The analysis of the solubility data indicated that in neutral and alkaline hydrothermal solutions iron mostly existed as Fe(OH)_3~0 and Fe(OH)_4~-, and it was calculated that △G_(Fe(OH)_3~0)~0=-561.9±3.3kJ/mol, and △G_(Fe(OH)_4~0)~0=-662.7±5.0 kJ/mol at 300℃. According to the analysis on the previous experimental studies about the transporting form of iron, the existing form of iron in hydrothermal solutions is discussed in this paper.
The solubility of Fe_2O_3 in dilute KOH and HClO_4 aqueous solutions was determined at 300 ℃ and 10 MPa. The analysis of the solubility data indicated that in neutral and alkaline hydrothermal solutions iron mostly existed as Fe (OH) __3 ~ 0 and Fe (OH) _4 ~ -, and it was calculated that ΔG_ (Fe (OH) _3 ~ 0) ~ 0 = -561.9 ± 3.3kJ / mol and △ G_ (Fe (OH) _4 ~ 0) ~ 0 = -662.7 ± 5.0 kJ / mol at 300 ° C. According to the analysis on the previous experimental studies about the transporting form of iron, the existing form of iron in hydrothermal solutions is discussed in this paper.