DEVICE FOR YIELDING DUSTY PRODUCTS FROM EQUIPMENTS SERVING FOR TREATING LIQUID OR SOLID MATERIALS

摘要

Urea in powder, formed in the course of a prilling opration in which molten urea is delivered to a prilling tower adjacent its upper end for the formation of droplets which descend to the bottom of the prilling tower through a countercurrent stream of cooling air delivered to the prilling tower adjacent its lower end and which entrains that urea powder, is recovered by withdrawing the stream of air and urea powder from the upper end of the prilling tower and feeding it to an ejector connected with a collecting tank. Motive power is supplied to the ejector by feeding an aqueous liquid to it and that liquid transports the urea constituting the powder to a collecting tank from which the urea is recovered.