The production method of water-soluble powder fertilizer mainly includes steps such as raw material preparation, crushing, precise batching, mixing, granulation (optional), drying, cooling, screening, metering and packaging. The specific introduction is as follows:

1、 Raw material preparation and inspection

Raw material selection: Select suitable raw materials according to the formula, such as nitrogen fertilizer (urea, ammonium nitrate, etc.), phosphorus fertilizer (monoammonium phosphate, diammonium phosphate, etc.), potassium fertilizer (potassium nitrate, potassium chloride, etc.), organic water-soluble fertilizer raw materials (amino acids, humic acid, etc.), and trace elements (boron, iron, manganese, zinc, etc.).

Raw material inspection: Conduct purity and heavy metal content testing on purchased raw materials to ensure that the quality of the raw materials meets production requirements.

2、 Crushing

Equipment selection: Use universal crushers or airflow mills and other equipment.

Key points of operation: Crush the agglomerated or oversized raw materials to a uniform fineness (usually 80-100 mesh or above) to ensure the uniformity of subsequent mixing.

3、 Accurate ingredients

Ingredient principle: Weigh each material using a high-precision electronic scale according to the formula ratio.

Operation mode: Small batch production can be manually weighed, and it is recommended to use an automatic batching system for large-scale production to improve batching accuracy and efficiency.

4、 Mixed

Equipment selection: commonly used equipment such as double helix cone mixer or horizontal spiral belt mixer.

Operation points: Put the prepared materials into the mixer for thorough mixing to ensure product uniformity. The mixing time should be determined based on the performance of the equipment and the characteristics of the material. If the time is too short, the mixing will be uneven, and if it is too long, it may lead to material separation.

5、 Granulation (optional)

Granulation purpose: To improve physical properties and enhance marketability. Powdered products are prone to generating dust and may have poor flowability, but granulation can solve these problems.

Granulation method:

Rotary granulation: Spray adhesive (such as water) into the mixer to agglomerate fine powder into granules.

Squeezing granulation: The mixed powder is forcibly extruded through an extruder and then broken into granules.

6、 Drying and cooling

Drying: If moisture is added during the granulation process or if the raw material itself has a high moisture content, a dryer (such as a boiling dryer or a drum dryer) is needed for drying.

Cooling: The dried particles have a high temperature and need to be cooled to room temperature by a cooling machine (such as a cooling drum) to prevent condensation after packaging.

7、 Screening and Measurement Packaging

Screening: Use a vibrating screen to separate the formed qualified particles from the powder or oversized particles, and return the powder to the granulation process.

Measurement packaging: Use automatic packaging machines (such as valve pocket packaging machines) for quantitative packaging, usually in 5kg/bag, 25kg/bag and other specifications.