How to Produce NPK Fertilizers Using an NPK Bulk Blending Machine
Producing NPK fertilizers using NPK bulk blending machine requires following the core process of raw material pretreatment → precise proportioning → uniform mixing → screening and packaging → finished product warehousing. The specific steps are as follows:
1. Raw Material Pretreatment: Single-element fertilizer raw materials such as urea, ammonium chloride, monoammonium phosphate/diammonium phosphate, and potassium chloride/potassium sulfate are crushed to a fineness of 80-100 mesh using a pulverizer, while removing hard impurities such as stones and metals; if trace elements or biological agents need to be added, they should be ground to a suitable particle size in advance to avoid affecting mixing uniformity.
2. Precise Proportioning: According to the target formula of the NPK blending fertilizer production line, the intelligent proportioning system uses high-precision weighing sensors to automatically transport each raw material to the mixer in the correct proportions. The proportioning accuracy is controlled within ±0.2%-±0.5%, ensuring that the nitrogen, phosphorus, and potassium nutrient ratios meet the standards.
3. Uniform Mixing: The prepared raw materials are sent to a twin-shaft mixer or horizontal ribbon mixer to ensure a coefficient of variation (CV) of less than 5% for material mixing uniformity; if producing functional blended fertilizers, controlled-release coating agents and biostimulants can be added simultaneously during the mixing stage to increase the added value of the fertilizer.
4. Screening and Packaging: The mixed materials are screened by a vibrating screen to remove agglomerated particles and fine powder, ensuring uniform particle size of the finished product; qualified materials are sent to an automatic packaging machine, weighed and bagged according to 25kg/50kg specifications, and labels containing nutrient content and production date are attached.
5. Finished Product Warehousing: The packaged fertilizers are stacked in the wareho