The core of the production process of water-soluble fertilizers is the dissolution of raw materials, mixing and compounding, filtration and impurity removal, quantitative filling, and ultimately the formation of fully water-soluble, residue free liquid or solid products.

1、 Core production process (taking liquid water-soluble fertilizer as an example)

Raw material pretreatment and weighing

Select raw materials with high purity and good solubility, such as potassium nitrate, potassium dihydrogen phosphate, EDTA chelated trace elements, etc.

According to the product formula (N-P-K ratio, trace element content), use an electronic scale to accurately weigh each raw material to ensure accurate nutrient ratios.

Step by step dissolution and mixing

Add the weighed raw materials in batches into the dissolution tank, first dissolve large amounts of elements (such as nitrogen, phosphorus, and potassium sources), and then add medium and trace elements and functional substances (such as humic acid and amino acids).

Continuously stir and control the temperature (usually 25-40 ℃) during the dissolution process to accelerate dissolution and avoid adverse reactions between raw materials.

Filtering and impurity removal

The dissolved liquid is filtered through multiple stages (such as bag filtration, precision filtration) to remove undissolved impurities, precipitates, or flocculent substances.

Ensuring that the final product is residue free and avoiding clogging of drip irrigation belts or nozzles is a key step that distinguishes water-soluble fertilizers from regular fertilizers.

Detection and adjustment

Sample and test the nutrient content, pH value, conductivity, and solubility of the product. If the indicators do not meet the standards, adjust them in a timely manner (such as supplementing raw materials or adjusting pH).

Some high-end products will also be tested for heavy metal content to ensure compliance with national standards.

Quantitative filling and packaging

Qualified liquid products are quantitatively injected into plastic barrels or soft packaging bags through automatic filling machines, and solid water-soluble fertilizers are packaged after concentration, spray drying or granulation.

The product name, nutrient content, production date, shelf life and other information should be marked on the packaging to complete the preparation before leaving the factory.

2、 Key control points

Raw material selection: Fully water-soluble raw materials must be used to avoid using materials containing insoluble substances such as potassium sulfate and superphosphate, in order to prevent affecting the solubility of the product.

Formula compatibility: Avoid direct mixing of raw materials that may undergo chemical reactions (such as calcium fertilizer and phosphate fertilizer). Dissolve or use chelated raw materials in steps to prevent precipitation.

Health and safety: Production equipment (dissolution tanks, pipelines, filters) should be regularly cleaned and disinfected to avoid microbial contamination; Operators need to take protective measures to prevent corrosive materials from coming into contact with the skin.