| 摘要 |
826,815. Granulating processes. MONTECATINI SOC. GENERALE PER L'INDUSTRIA MINERARIA E CHIMICA, and ATELIERS DE CONSTRUCTIONS MECANIQUES DE VEVEY S. A. Feb. 13, 1958 [Feb. 14, 1957], No. 4717/58. Class 111. [Also in Group V] Granules are formed from a concentrated solution or a melt e.g. molten ammonium nitrate by placing the liquid in a vessel 1 and allowing the liquid to fall as drops on to a cool surface whilst vibrating the nozzle in a horizontal plane by an electro-magnetic vibrator 6. It is stated that the horizontal vibration produces multiple trajectories and therefore increases the output of the apparatus and also produces drops of predetermined size. If the drops are to be coated they are allowed to fall into a cooling pad comprising a gaseous suspension of the powdery material with which the granules are to be coated the powder may be calcium carbonate or diatomaceous earth or a mixture of inert materials including the substance to be granulated in a solid state. The bed may be vibrated or current of air or gas may be blown through it. The liquid in the vessel is agitated by a vibrating rod 7. The Specification includes tables giving relations between nozzle diameter height of the column of liquid amplitude of vibration height of fall and the diameter of the drops formed. |
