Magnetic Separations with Magnetite: Theory, Operation, and Limitations

Cotten, G. B.

Idaho National Engineering and Environmental Laboratory

关键词: Removal;    Magnetic Separators;    Separated;    Filtration;    Batch Flow;   

DOI  :  10.2172/765801
RP-ID  :  INEEL/EXT-2000-00995
RP-ID  :  AC07-99ID13727
RP-ID  :  765801

美国|英语

来源: UNT Digital Library

【 摘 要 】

This dissertation documents the theory development and experimental plan followed to describe how a magnetite-based column under the influence of an external magnetic field functions as a magnetic separator. Theoretical simulations predict that weekly paramagnetic particles in the sub-micron range can be magnetically separated while diamagnetic particles as large as 2 microns in diameter may pass. Magnetite-based columns were evaluated as magnetically-controllable enhanced filtration devices. There was no evidence of enhanced filtration for diamagnetic particles by the magnetite-based bed. Magnetite-based magnetic separators have proven to be effective in specific laboratory experiments, indicating a potential feasibility for scale-up operations. Column media-filter type filtration effects indicate a magnetite-based column would not be suitable for treatment of a waste stream with a high diamagnetic solids content or high volume throughput requirements. Specific applications requiring removal of sub-micron para- or ferromagnetic particles under batch or Stokes flow conditions would be most applicable.