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Rotary drum granulator retention time and its importance

 In the organic fertilizer production line or npk production line, there is usually drum equipment, so what is the residence time of materials in the drum equipment? In the field of continuous bulk solids processing equipment, retention time can be one of the most influential variables in a process setup, especially when processing material in a rotary dryer, rotary kiln, rotary drum granulator, or other type of rotating drum. Also commonly referred to as residence time, retention time is the amount of time a material is processed in a given piece of equipment. In most process setps, a producer must be able to achieve a specific retention time to achieve their intended goals, which could be:
1.Reach a specific moisture content
2.Initiate or complete chemical reactions or phase transitions
3.Let the coating absorb into the substrate
4.Particle formation within the desired particle size distribution (PSD)
5.Uniform coating on granules

The ability to achieve these goals is fundamental to many mineral and chemical processing operations, so proper retention times are critical. This is especially true for drying, pelletizing and high-temperature heat-treating applications, where retention time can mean the difference between a product meeting specification and material loss. The importance of retention time may vary from operation to operation, but is always important during the initial drum sizing process for quality and efficiency purposes.

For example, in terms of quality, sizing a spin dryer without proper knowledge of retention time can result in the material reaching the target moisture level halfway through its journey through the drum, meaning the material will continue to dry for the remainder of the unit of time. half of. This can cause the material to overdry and break down into fine crumbs. Likewise, if the drum is not long enough to accommodate the necessary retention time, material may exit the drum before reaching the desired moisture content. Therefore, manufacturers must first determine the retention time at which their material will achieve the desired target. This is done through testing.