Mechanism of particle flocculation by magnetic seeding

Journal Article · Tue Dec 24 23:00:00 EST 1996 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1006/jcis.1996.0643· OSTI ID:419829

Yiacoumi, S; Rountree, D A ^[1]; Tsouris, C ^[2]

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1. Georgia Inst. of Tech., Atlanta, GA (United States). School of Civil and Environmental Engineering
2. Oak Ridge National Lab., TN (United States). Chemical Technology Div.

Magnetic seeding flocculation of micrometer-sized particles in liquid suspensions is investigated. Primary forces acting on individual particles, including gravity and magnetic attraction, as well as van der Waals, electrostatic, magnetic dipole, and hydrodynamic interparticle forces, are examined and quantified. A mathematical statement of the overall relative velocity is developed from the net force acting on a particle. From this, the equation of relative motion for two particles in cylindrical coordinates is derived. A computer model is then used to solve this equation repeatedly to find the particle trajectory borderline between collision and noncollision, thus determining the collision efficiency and collision frequency. The effects of a variety of parameters on flocculation performance are then explored. It is found that some factors have unexpected and complex influences on the collision efficiency and collision frequency, particularly the particle size ratio and the direction of the magnetic field. Magnetic separation has been used for desulfurization of coal, and separation and concentration of mining ores and wastes, and nuclear reactor coolant water filtration.

• DOE Contract Number: AC05-96OR22464
• OSTI ID: 419829
• Journal Information: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 184; ISSN JCISA5; ISSN 0021-9797
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
40 CHEMISTRY
COAL PREPARATION
COMPUTERIZED SIMULATION
COOLANT CLEANUP SYSTEMS
FLOCCULATION
FORCING FUNCTIONS
MAGNETIC SEPARATORS
MATHEMATICAL MODELS
ORE PROCESSING
PARAMETRIC ANALYSIS
PARTICULATES