Four Common Compound Fertilizer Production Processes and Granulation Methods
This process is the simplest compound fertilizer production process in our country.
The compound fertilizer manufactured by this process or method is called blended fertilizer or BB fertilizer. It is characterized by simple process, flexible ratio, raw material fertilizers remain intact, relatively intuitive, and easy adjustment of nutrient ratio. But its disadvantages are: fertilizer is easy to produce nitrogen, phosphorus and potassium separation during transportation and application, and fertilizer is 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.
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. Points. The material in the granulator should be controlled at the best temperature (50～80℃) and the best water content (2.5%～7.5%) in order to achieve suitable granulation conditions. 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.
- Slurry production process technology
The slurry process is the reaction product of sulfuric acid, nitric acid, phosphoric acid or some mixed acids and 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 fertilizer are completely the same. The physical and chemical properties of the particles are first-rate. The forms of nitrogen in fertilizers include ammonium nitrogen and nitrate nitrogen, so the fertilizer efficiency is better than single urea or single ammonium nitrogen, phosphorus and potassium fertilizers.
- High-tower granulation production technology of urea-based compound fertilizer
This process is a new process that has appeared in compound fertilizer production process in recent years, and it is also a high-tower urea-based compound fertilizer process. It actually melts the urea. The molten urine is metered and sent into the mixer with a melting pump, and then the heated powdered monoammonium phosphate, potassium chloride and additives (auxiliary materials) are metered into the heater for heating , The preheated material is sent to the mixer to mix and react with the molten urine, and is fully mixed to form an addition compound slurry with high solubility and certain fluidity. 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.
Here are quality compound fertilizer production equipment in FPC company. Welcome to our official website to get detailed information.
https://www.fertilizerplantcost.com/npk-compound-fertilizer-production-line/