The production process of liquid fertilizer includes raw material processing, dissolution, filtration, reaction/chelation, blending, filling, and equipment configuration. The process needs to be adjusted according to the product type (clear liquid or suspension), while paying attention to raw material selection, reaction condition control, and equipment selection to ensure product quality. Here is a detailed introduction:

　　1、 Core process flow

　　Raw material dissolution

　　Clear liquid type: Add urea ammonium nitrate solution, potassium dihydrogen phosphate, potassium chloride, chelated trace elements and other raw materials into the reaction kettle in order, and dissolve them in deionized water or purified water. Generally, the raw material with low solubility is added first, followed by the raw material with high solubility.

　　Suspension type: After dispersing the raw materials, grind them to ensure that the particle fineness meets the requirements.

　　filter

　　Use precision filters (such as bag filters, plate and frame filters) to remove insoluble impurities and ensure that the product is clear and transparent. The filtering accuracy is usually between 1-5 μ m.

　　Reaction/chelation

　　If trace elements need to be added or chelation reactions need to be carried out, this stage should be completed. By controlling the temperature (usually 50-70 ℃), pH value, and stirring speed, chelation reaction is promoted to form a stable liquid.

　　For example, first add chelating agents such as humic acid and amino acids, and then add metal ions to prevent precipitation.

　　allocate

　　Measure the pH and density of the solution, and adjust it by adding acid, alkali, or water if necessary to meet the standards.

　　Add preservatives (such as potassium sorbate), surfactants, and other additives to improve product performance.

　　filling

　　Divide the finished liquid into plastic drums or IBC ton drums through a filling machine.

　　During the filling process, attention should be paid to preventing material dripping and contamination, ensuring the sealing of the packaging.

　　2、 Key equipment configuration

　　Dissolution/Reaction Equipment

　　Adopting stainless steel or PE enamel reaction kettle with stirring and heating/cooling jacket to ensure reaction uniformity and temperature control accuracy.

　　filtration equipment

　　Precision filters, bag filters, etc. are used to remove insoluble impurities and ensure product clarity.

　　Grinding equipment (for suspended fertilizer)

　　High shear emulsifiers, sand mills, etc. are used to grind particles to the desired fineness.

　　Filling equipment

　　Liquid automatic filling machine, equipped with weighing sensors and fast and slow filling valves, ensures filling accuracy and speed.

　　delivery pump

　　Stainless steel centrifugal pumps, diaphragm pumps, etc. are used for automatic pumping and circulation of materials.