| 摘要 |
The present invention relates to a filtering unit at least partially filled with particles agglomerated from fine-particle iron oxide and/or iron oxyhydroxide by producing an aqueous suspension of fine-particle iron oxides and/or iron oxyhydroxides having a BET surface area of 50 to 500 m<SUP>2</SUP>/g, and removing the water and dissolved constituents by a set of washing drying and filtering steps and processes of using the particles.
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