The Fe3O4-formation by the ‘Ferrite Process’: Oxidation of the reactive Fe(OH)2 suspension induced by sucrose |
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Authors: | Yutaka Tamaura Gyong Sun Chyo Takashi Katsura |
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Affiliation: | Department of Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan |
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Abstract: | A mechanism of the formation of small particles of iron oxide in the wastewater treatment system ‘Ferrite Process’ is described. Small particles consisting of the Fe3O4−γ-Fe2O3 solid solution having slightly higher content of γ-Fe2O3 were obtained by the aerial oxidation of Fe(OH)2 suspension in the presence of a weak dispersing reagent, sucrose, at pH 9.0. The increase of γ-Fe2O3 content is caused by a further oxidation of the Fe3O4 particles in the course of the reaction. The further oxidation was accelerated below 1000 Å of the particle size. When SO2−4 ion coexisted with sucrose in the reaction medium, the further oxidation was reduced and the treatment of the wastewater was improved. At a temperature interval of 40°–65°C, the formation of α-FeOOH was completely inhibited by a small amount of sucrose and only Fe3O4 was obtained. |
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