Abstract: An apparatus for granulation of fine, light powder by mixing a powder and a mist of binder with a fluidizing air flow. The apparatus includes a container and a filter, provided along an inner peripheral surface of the container, for forming a high density powder layer thereon. A space, formed between the container and the filter, is divided into a plurality of ring-shaped zones. Also, a backwash mechanism and an exhaust mechanism are connected to the container so as to be selectively communicated with the ring-shaped zones.

Abstract: The present invention is intended for granulation of powder comprising the steps of mixing a powder and a mist of binder by fluidizing air flow, collecting the mixture of the powder and the binder on a filter surface thereby forming a powder layer thereon, peeling off the powder layer from the filter surface thereby crushing the powder layer into pieces, returning the crushed fragments into the fluidizing air flow and mixing them with the mist of binder again, repeating the steps until the desired granule is obtained.

Abstract: The spraying nozzle of this invention establishes supersonic gas jets directed towards an edge on two liquid flow surfaces formed by that edge. High frequency aerodynamic oscillations are generated in front of the edge. Liquid is supplied to the liquid flow surfaces. The gas flow spreads liquid on a liquid flow surface into a thin film which flows along the liquid flow surface towards the edge. The thin film flow becomes thinner, separates from the edge, and is sprayed as liquid droplets. The liquid droplets are sucked into the gas jet convergence point where they are further fragmented into extremely fine particles by shock waves of the gas jets. The ultra-fine particles are rapidly swept away from the edge by the gas flow.