Production process of mixed fertilizer

How to produce mixed fertilizer and what production line equipment is needed?

The choice of blending fertilizer equipment and production technology depends on many factors. First of all, it depends on the current technology level of compound fertilizer, and the progress of science and technology, and the production level of basic fertilizer. In addition, there are also local and nearby base fertilizer varieties and production layouts. How to produce blended fertilizers and what production line equipment is needed?
Fertilizer transportation, storage, and cost, agricultural production structure, fertilizer market status, price of fertilizer applicator and blending equipment, etc. At the same time, there are a variety of mixed fertilizer production technologies in different regions. With the improvement of the basic fertilizer production level, the production model of compound fertilizer has also changed.

Several production processes and granulation methods of common compound fertilizers

1. Blending production technology

This process is the simplest compound fertilizer production process in my country.
The compound fertilizer manufactured by this process or method is called blended fertilizer or BB fertilizer. It is characterized by a simple process, flexible ratio, raw material fertilizers remain intact, relatively intuitive, and easy adjustment of nutrient ratio. But its disadvantages are: fertilizers are easy to separate nitrogen, phosphorus, and potassium during transportation and application, and fertilizers are easy to absorb moisture and agglomerate. At present, most BB fertilizer formulas on the market are high-nitrogen, high-potassium, high-concentration type, and lack middle and trace elements.

2. Production technology of dry powder physical agglomerate method:

The dry powder physical agglomerate granulation technology is to select several kinds of fertilizer raw material dry powder to measure and mix according to the needs and use the binder as the cement to granulate in the granulator. The granulation of dry powder mixture requires heating, and the amount of liquid phase is increased by adding water or steam, and then agglomerated into compound fertilizer particles of a certain size in the (disc) or drum under rolling conditions. At present, the addition of acid (especially the addition of phosphoric acid) and ammonia is usually used in this type of process to increase the amount of liquid phase, and the chemical reaction that occurs is used to provide heat. The ammonium phosphate produced by the reaction of phosphoric acid and ammonia becomes a component of the compound fertilizer. Minute. The compound fertilizer manufactured by this process has no substantial difference from the above-mentioned BB fertilizer in terms of the composition of nitrogen, phosphorus, and potassium of the fertilizer. Just take the original smaller particles (powder) and unite them into particles. Therefore, it can also be said that the compound fertilizer manufactured by this process is a deep-processed BB fertilizer.

3. Slurry production process technology:

The slurry process is the product of the reaction of sulfuric acid, nitric acid, phosphoric acid, or some mixed acids with ammonia (sometimes the product of the reaction of acid and phosphate rock powder) is a nitrogen-phosphorus slurry. Then add potassium salt to the slurry or directly add the potassium salt to the granulator, and then spray the nitrogen and phosphorus slurry into the granulator, and then react with the potassium salt at high temperature to prepare a ternary compound fertilizer of nitrogen, phosphorus, and potassium. The nutrient content in the compound fertilizer manufactured by this process is very uniform, and the nutrient content and ratio in the large and small granular fertilizers are completely the same. The physical and chemical properties of the particles are first-rate.

4. High-tower granulation production technology of urea-based compound fertilizer:

This process is a new process that has appeared in my country’s compound fertilizer production process in recent years, that is, the high-tower urea-based compound fertilizer process. It actually melts the urea. Then, it flows into the rotating nozzle on the top of the tower by its own gravity and sprays into droplets. The droplets descend from the top of the tower and contact the rising cold air in reverse to transfer heat, crystallize, solidify, and cool in the air into finished particles. The large particles sieved out are crushed by the crusher and used as the return material together with the fine powder and then added to the heater for recycling.