High gradient magnetic separation YBCO particles in a gas-fluidized bed

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/20.144744· OSTI ID:6858437

Labroo, S; Ebrahimi, Y; Park, J Y; Yeh, W J ^[1]

---

1. Dept. of Chemical Engineering, Univ. of Idaho, Moscow, ID (United States)

In this paper, high gradient magnetic separation of copper-oxide superconducting particles in a gas-fluidized bed is studied experimentally. Particles over the size range 45-105 [mu]m exhibit classical behavior when fluidized with He gas at 77 K, whereas the more cohesive, smaller particles were difficult to fluidize. Separation experiments on a uniform mixture of tetragonal and orthorhombic phases have shown that 30 min of exposure to the field gradient is sufficient to equilibrate the superconductor concentration profile. In addition, the equilibrium separation data reveal that best separation is achieved at three times the minimum fluidization gas velocity U[sub mf]. This is consistent with the behavior of fine powders where the interparticle frictional forces are minimized at 3 U[sub mf]. Observed results are discussed in terms of a collective effect of Meissner and interparticle friction.

• Sponsoring Organization: NSF; National Science Foundation, Washington, DC (United States)
• OSTI ID: 6858437
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Vol. 28:4; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CLASSICAL MECHANICS
COPPER COMPOUNDS
CUPRATES
ELEMENTS
EXPERIMENT PLANNING
FLUIDIZED BEDS
FLUIDS
FRICTION
GASES
HELIUM
HIGH-TC SUPERCONDUCTORS
MECHANICS
MEISSNER-OCHSENFELD EFFECT
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PLANNING
RARE GASES
SEPARATION PROCESSES
SIZE
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES