Abstract
Droplets of solution or slurry material for hydroxyapatite (HAp) are continuously fed to a fluidized bed, where simultaneous evaporation of liquid or slurry material, pyrolysis of produced precursor powder, crushing and heat treatment and entrainment of product HAp powder occur. The present work explored the effects of solution material, solution aging time and type of coarse medium particles on the Ca/P molar ratio, thermal stability of product powder, and attrition of medium particles. Alumina ball was superior to silica sand for coarse medium particles, decreasing the attrition. A liquid material containing Ca(NO)3 and (NH4)2HPO4 produced HAp powder with superior thermal stability.
