Apparatus for producing nitrate granules

B - Operations – Transporting – 01 – J

Patent

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Details

B01J 8/26 (2006.01) B01J 2/16 (2006.01) B01J 8/34 (2006.01) B01J 19/26 (2006.01) C01B 21/48 (2006.01) C01F 5/38 (2006.01) C01F 11/44 (2006.01) C01C 1/18 (2006.01) C05C 1/02 (2006.01)

Patent

CA 2507396

This invention relates to an apparatus (10) for producing nitrate granules. The apparatus (10) includes a first fluidised bed (12) which is supplied with air (18) that has been conditioned to a relative humidity of less than 30% at 40(C and heated to a temperature of 40(C to 100(C. One or more spray nozzles (26) are provided for spraying a nitrate melt into the first fluidised bed (12) to form nitrate granules. The apparatus (10) also includes a second fluidised bed (14) which is in direct communication with the first fluidised bed (12). Nitrate granules formed in the first fluidised bed (12) flow directly to the second fluidised bed (14) where they are cooled to a temperature of less than 60(C. The nitrate granules produced by the apparatus (10) and process of the invention are spherical in shape, hard and dry and do not break down easily during handling. A main advantage of the apparatus (10) according to the invention is that it is compact, capable of very high product rates, and can be operated by one operator.

L'invention concerne un dispositif (10) servant à produire des granules de nitrate. Ce dispositif (10) comprend un premier lit fluidisé (12) alimenté en air (18) conditionné à une humidité relative inférieure à 30 % à 40 ·C et réchauffé à une température entre 40 ·C et 100 ·C. Un ou plusieurs ajutages de pulvérisation (26) servent à pulvériser du nitrate en fusion afin de l'introduire dans le premier lit fluidisé (12), de manière à le transformer en granules de nitrate. Ce dispositif (10) comporte également un deuxième lit fluidisé (14) communiquant directement avec le premier lit fluidisé (12). Les granules de nitrate créés dans le premier lit fluidisé (12) s'écoulent directement vers l'intérieur du deuxième lit fluidisé (14) dans lequel ils sont refroidis à une température inférieure à 60 ·C. Ces granules de nitrate obtenus au moyen de ce dispositif (10) et de ce procédé présentent une forme sphérique, sont durs et secs et ne se fractionnent pas facilement pendant la manipulation. Un avantage principal de ce dispositif (10) consiste en sa compacité, ainsi qu'en sa capacité de production très élevée et de mise en service par un seul opérateur.

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