Summary: Flocculation and filtration of colloidal particles are examined in this paper. Hematite pseudocubical particles of 1-mm diameter are synthesized and their removal efficiency by a high-gradient magnetic filter is experimentally investigated. Experiments are conducted using a cryogenic magnet of 6 Tesla maximum strength. A new approach of using magnetic seeding to enhance separation of weakly magnetic particles is also investigated. A particle-flocculation model is developed based on trajectory analysis.

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