Magnetic filtration of an iron oxide aerosol by means of magnetizable grates--颗粒学报PARTICUOLOGY

Alvaro, A., Rodríguez, J. M., Augusto, P. A., & Estévez, A. M. (2007). Magnetic filtration of an iron oxide aerosol by means of magnetizable grates. China Particuology, 5(1), 140–144. https://doi.org/10.1016/j.cpart.2006.12.006

Magnetic filtration of an iron oxide aerosol by means of magnetizable grates

A. Alvaro ^a, J.M. Rodríguez ^a, Paulo A. Augusto ^a b, A.M. Estévez ^a *

a Department of Chemical Engineering, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
b Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

10.1016/j.cpart.2006.12.006

Volume 5, Issues 1–2, February–April 2007, Pages 140-144

Received 1 September 2006, Accepted 17 December 2006, Available online 6 June 2007.

E-mail: estevez@usal.es

Highlights

Abstract

The cleaning of gases with low concentrations of small ferromagnetic or paramagnetic particles is a difficult task for conventional filtration. A new alternative procedure, magnetic filtration, is used in this work.

Iron oxide aerosol was generated by elutriation of iron oxide particles from a fluidized bed consisting of a mixture of Geldart-C iron oxide powder and large spherical Geldart-B sand particles. The aerosol was filtered by means of a magnetic filter which consisted of one, two or three iron grates staggered to each other. The experimental installation contained also an isokinetic sampling system and a Microtrac SRA 150 Particle Analyser.

A theoretical expression for filtration efficiency was deduced from a previous model taking into account the different forces acting on the iron oxide particles. Experimental filtration efficiency matches quite well calculated theoretical efficiency. It was found that an increase in particle size, in the number of grates or in the applied magnetic field produced higher filtration efficiencies up to 100% in some cases. In all filtration experiments pressure drop through the magnetic filter was very small.

Graphical abstract

Keywords

Iron oxide aerosol; Magnetic filtration; Iron grates

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