2026/05/29
During fertilizer produciton machine operation, the particles tumble at high speed, rub against each other, and collide. Rapid airflow on the surface removes free moisture from the particle surface. Under normal operating conditions, the moisture content generally decreases by 1%–2%. If the initial moisture content of the particles is high and the surface is moist, the moisture loss will be slightly greater, with a maximum decrease of about 3%. For particles that are already relatively dry, the moisture change is negligible.
If the matching spray device is activated to add water or binder, it will slightly increase the surface moisture. This is mainly used to improve particle roundness and reduce dust. The spray volume needs to be controlled to prevent the particles from becoming damp and soft again.
Rounding machines have no heating structure; they rely solely on physical friction and natural airflow for dehydration. The internal temperature increase is limited and does not deeply remove bound water from the particles. Therefore, it does not change the internal humidity of the particles and will not cause particle cracking.
In actual production, this characteristic can be flexibly utilized: granules that are slightly damp and prone to sticking together after granulation can be naturally dehumidified through the rounding process, reducing the subsequent drying load; if the finished product moisture content has reached the standard, the spraying can be turned off and the feeding speed controlled to reduce moisture loss. It should be noted that moisture fluctuations can indirectly affect granule strength; therefore, coordinated control with drying and cooling processes is necessary to stabilize the quality of the finished product.
