Agglomeration apparatus and method for producing agglomerated particles
Inactive Publication Date: 2009-04-09
NIRO
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Benefits of technology
[0001]The present invention relates to an agglomeration apparatus and a method for producing agglomerated particles. The present invention is useful for increasing the particle size and for removing or reducing the amount of dust in the final product. In certain embodiments, a narrow particle size distribution of the agglomerated particles may be obtained.
Problems solved by technology
However, when the particle size is small, dust problems may arise.
In addition, agglomeration of particles may confer new or changed properties, such as increased solubility or wettability.
However, the treatment of the particles in the prior art apparatuses and the atomizing of agglomeration fluid are not sufficiently well-defined for a uniform agglomeration to take place.
Method used
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example
[0064]The invention was tested on an agrochemical product in a Niro FSD™ spray dryer. The spray dryer including an integrated fluid bed was provided with an agglomeration nozzle in each of the two bed zones.
[0065]With the nozzles shut off, a product of mean particle size of 182 microns and a bulk density of 0.36 g / ml was achieved. With the agglomeration nozzles operating, spraying the same feed solution as in the top of the spray dryer, a product having a mean particle size of 495 microns and a bulk density of 0.36 g / ml was achieved. Thus, it was possible to obtain more than a doubling in mean particle size while being able to maintain the bulk density.
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Abstract
The invention relates to an agglomeration apparatus comprising a fluid bed, a source of descending particles, one or more nozzles for atomizing an agglomeration fluid and an outlet for discharging the agglomerated particles. In the fluid bed, the particles are guided towards the outlet and pass an outer and an inner zone. The apparatus provides for the production of an improved agglomerated particulate product with a low content of fine particles.
Description
[0001]The present invention relates to an agglomeration apparatus and a method for producing agglomerated particles. The present invention is useful for increasing the particle size and for removing or reducing the amount of dust in the final product. In certain embodiments, a narrow particle size distribution of the agglomerated particles may be obtained.BACKGROUND ART[0002]It is convenient to provide a variety of solids in a particulate state. However, when the particle size is small, dust problems may arise. One way of avoiding dust problems is to agglomerate the small particles into a larger agglomerated product. In addition, agglomeration of particles may confer new or changed properties, such as increased solubility or wettability.[0003]EP 1 227 732 B1 (Niro) suggests agglomerating particles in a spray dryer having an integrated fluid bed in the bottom and a flexible filter element in the top of the drying chamber. Optimal agglomeration is obtained along the inner surface of a...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B29B9/00B28B17/00
CPCB01J2/16F26B3/08B29B9/08B29L2031/772
Inventor NIELSEN, PETER SCHULTZ
Owner NIRO