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Dry Particle Coating using Rotating Fluidized Bed

Dry Particle Coating using Rotating Fluidized Bed

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Dry Particle Coating using Rotating Fluidized Bed

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  1. Fluid Inlet HOST GUEST MECHANICAL FORCES COLLISION HOST HOST COLLISION MECHANICAL FORCES Manometer Plenum Distributor Motor GUEST Distributor Back Plate GUEST GUEST COLLISION MECHANICAL FORCES Shaft Flowmeter Exhaust Powder Fluidizing Air Fluid Inlet Dry Particle Coating using Rotating Fluidized Bed Ales Sliva, Madhuri Kolli, Rajesh Dave and Robert PfefferNew Jersey Center for Engineered Particulates (NJCEP), New Jersey Institute of Technology, University Heights, Newark, NJ 07102-1982 Coated Glass Beards with Alumina and SiC Abstract Dry particle coating, in which fine guest particles are coated onto larger host particles in the absence of binders or solvents, is studied for various combinations of host and guest particles. Results of dry particle coating that indicate very good discrete coating in the form of SEM and SEM-EDX pictures, and graphs of theoretical and experimental value of minimum fluidization velocity for several operating systems have been investigated. Microcrystalline Fibrous Cellulose Schema of Rotating Fluidized Bed Coater (RFBC) (A) (B) (C) (D) Scanning Electron Micrographs of (A) Uncoated Glass bead (B) Coated glass bead with Alumina (C) Alumina EDX mapping.(D) Glass bead coated with SiC Minimum Fluidization Velocity of Cellulose at 800 RPM: Theoretical and Experimental Values. Coated Cornstarch with Fumed Silica Particle-Particle Collision in RFBC (A) (B) (C) Scanning Electron Micrographs of (A) Uncoated Cellulose (B) Cellulose coated with Silica (C) Cellulose coated with SiC + (A) Collisions between host and guest + (B) Collisions between two host particles (C) Collisions between two guest particles + Theorecical and Experimental Values of Minimum Fluidization Velocity of Glass Beads Experimental value of minimum fluidization velocity, Umf of cornstarch at 800RPM. Velocity of Glass Beads at 800RPM Velocity of Glass Beads at 600RPM Mean Diameter of Observed Host and Guest Particles Coated Glass Beards with Titania (A) (B) Operating Parameters for Glass Beads – Titania system (A) and (B) Scanning Electron Micrographs of cornstarch coated with silica. • Conclusions • Experimental pressure drop is less than the theoretical pressure drops by 35% on an average probably due to • constant voidage, • monodisperse particles, • absence of elutriation, etc. • For the guest particles used for coating are very fine and cohesive (Group C particles), some of these guest particles like SiC and alumina are observed to agglomerate and form small spherical granules during the coating process. Properties of Observed Host and Guest Particles (A) (B) Scanning Electron Micrographs of (A) Coated Glass Bead with Titania (B) Uncoated Glass Bead