The rotary drum granulator is one of the key equipment on the NPK (nitrogen phosphorus potassium) fertilizer production line. Through a series of exquisite designs and technologies, it achieves effective conversion from loose powdered raw materials to uniform and solid particles. The following are the specific steps for NPK fertilizer granulation using a rotary drum granulator:
Principle Overview
The rotary drum granulator mainly relies on the principles of physical mechanics, which utilize the centrifugal force generated by the rotation of the drum and the frictional force between the materials, combined with an appropriate amount of moisture, to aggregate the raw material powder into spherical particles.
Granulation steps
Raw material preparation: Firstly, feed the pre mixed NPK raw material powder into the granulator, which contains the required nitrogen, phosphorus, potassium, and other auxiliary components.
Humidification treatment: In order to promote the formation of particles, an appropriate amount of water or liquid binder needs to be added to the raw material, and the amount of water added needs to be precisely controlled to ensure the optimal performance of the final particles.
Rotating granulation: The raw materials enter the rotating drum, and the inclination angle and speed of the drum are precisely set. The raw materials roll inside the drum while being subjected to centripetal force, gradually aggregating and increasing. The materials are bonded together by friction, forming initial small balls.
Particle maturity: Over time, the small ball continues to roll and collide in the drum, gradually growing to the desired size. This process is accompanied by the material’s own gravity, centrifugal force, and interactions between particles, until the particles reach the desired size and hardness.
Cooling and solidification: After the particles are formed, they usually go through a cooling stage to remove excess moisture, strengthen the particle structure, and ensure their integrity during transportation and storage.
Screening and classification: Finally, the granulated NPK fertilizer particles are screened to remove particles that are too large or too small, ensuring that the product quality meets the standards. Unqualified particles can be returned to the granulation process for further processing.
Technical Details
Drum design: The drum of the rotary drum granulator is made of special materials, which have excellent corrosion resistance and wear resistance, ensuring long-term stable operation.
Intelligent control: Modern rotary drum granulators are equipped with advanced monitoring and control systems that can monitor and adjust granulation conditions in real time, such as temperature, humidity, and speed, to achieve the best granulation effect.
Environmental protection measures: Some models are equipped with built-in dust removal and exhaust gas treatment systems, effectively reducing emissions and complying with strict environmental regulations.
The rotary drum granulator greatly promotes the industrial production and quality improvement of NPK fertilizers through its efficient granulation capacity and excellent performance, providing strong support for modern agriculture and horticulture.