Process for production of iron oxyhydroxide particles

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

Reexamination Certificate

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C423S140000, C423S142000, C423S144000, C423S147000, C106S456000

Reexamination Certificate

active

07910085

ABSTRACT:
The process for production of iron oxyhydroxide particles according to the invention is characterized by comprising a step (A) in which a suspension containing iron(II) is prepared, and a step (B) in which fine bubbles with diameters of 0.05-500 μm are generated in the suspension to form a reaction mixture, and the iron(II) in the reaction mixture is oxidized by the bubbles to produce iron oxyhydroxide particles.

REFERENCES:
patent: 2008/0241055 (2008-10-01), Kawase et al.
patent: 1567957 (1980-05-01), None
patent: 3-228829 (1991-10-01), None
patent: 3003581 (1994-08-01), None
patent: 10-182162 (1998-07-01), None
S.H. Drissi, et al., “The Preparation and Thermodynamic Properties of Fe(II)-Fe(III) Hydroxide-Carbonate (Green Rust 1); Pourbaix Diagram of Iron in Carbonate-Containing Aqueous Media,” Green Rust, Corrosion Science, vol. 37, No. 12,1995, pp. 2025-2041.
M. Zaiyong, et al., “Preparation and Surface Modification of Transparent Yellow Iron Oxide Pigments,” Modern Paint and Finishing, vol. 5, May 2004, pp. 27-30.
Ma Shiyu, et al., “Ultramicro Bubble Chemistry and Application,” The 10thNational Conference of Colloid and Surface Chemistry, Dec. 31, 2004.

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