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Effect of sulphate ions on iron precipitation from aqueous solutions
Author(s) -
Korchef A.,
Ben Amor M.,
Galland S.,
Persin F.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200800103
Subject(s) - hematite , precipitation , aqueous solution , chemistry , differential scanning calorimetry , hydroxide , magnetite , inorganic chemistry , scanning electron microscope , iron oxide , oxide , ion , magnesium , nuclear chemistry , mineralogy , materials science , metallurgy , physics , organic chemistry , meteorology , composite material , thermodynamics
In the present work, the effects of sulphate ions on the iron precipitation from aqueous solution were investigated. It was shown that sulphate ions delayed the iron precipitation when this ion was added in form of Na 2 SO 4 . This effect became less significant in presence of magnesium or calcium. The iron precipitates were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). In all experiments iron oxide hydroxide (FeOOH) precipitates were obtained. The sulphate ions were adsorbed on the surfaces of the iron precipitates. The effect of temperature on these precipitates was also studied. At 237 °C, the iron oxide hydroxide precipitates obtained from NaCl solution was transformed in crystallized hematite, Fe 2 O 3 . At 793 °C, the hematite was partially transformed into magnetite (Fe 3 O 4 ). In presence of sulphate ions, this transformation was not detected. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)