2026/02/05
To achieve uniform granulation in NPK fertilizer production, a closed-loop control system encompassing the entire process of mixing, granulation, and screening is necessary, focusing on the NPK fertilizer granualtor machine and double roller press granulator.
Raw materials are first uniformly crushed to 80-100 mesh, with the moisture content stabilized within the appropriate range. A precise batching system ensures accurate metering, and thorough pre-mixing ensures uniform distribution of components, preventing segregation that could affect granulation.
When using a roller extrusion granulator, consistent roller cavity precision, constant pressure and quantitative feeding, and stable extrusion pressure are crucial. Coupled with crushing and shaping processes, this minimizes particle size variations from the source. When using an NPK fertilizer granulator (disc/drum type), the tilt angle and rotation speed parameters are locked, the binder is uniformly atomized and sprayed, and a reasonable return ratio is controlled to act as seed crystals, preventing localized over-wetting and agglomeration.
The downstream process includes three-stage screening, with coarse particles crushed and fine powder recycled, forming a stable return system. Online particle size detection is used to adjust the granulator's feeding, pressure, and spraying volume, reducing process fluctuations.
Regular maintenance of wear parts such as roller skins and screens is essential, along with cleaning of material buildup and bridging in the hopper. DCS monitoring of the granulator's current and pressure ensures stable equipment operation. Under these multiple control measures, the finished product's particle size qualification rate can consistently meet standards, resulting in uniform and regular NPK granules.
