METHOD AND DEVICE FOR MODIFYING SURFACE OF POWDER

摘要

PURPOSE:To make the bonding of base particles and secondary particles sure by dispersing and spraying the composites in which the surfaces of the base particles becoming nucleuses are covered with the fine particulate secondary particles by means of frictional electrification into hot air and instantaneously melting the surface layer parts and cooling them. CONSTITUTION:Composites A are formed by sticking secondary particles (b) on the surfaces of base particles (a) becoming nucleuses by means of frictional electrification. The composites A are fed to a proportioning feeder 1 and fed to a vibrating feeder 3 via a discharge port 2 at quantitative amount and thereafter fed to a spraying nozzle 4. The composites A discharged through the tip of the spraying nozzle 4 are jetted toward the inside of the hot-air current jetted through a hot-air nozzle 7. The composites A are passed through the hot-air current and thereby all particles are heated at high temp. homogeneously and instantaneously in a dispersion state and therefore the composites formed by frictional electrification are completely fixed and encapsulated.