The compound fertilizer rotary drum granulator is a specialized equipment for producing compound fertilizer granules. Its working principle and granulation process integrate chemical reactions and physical processes. The following is a detailed analysis:

working principle

The compound fertilizer rotary drum granulator mainly consists of a rotating cylindrical body, transmission device, support device, and sealing device. During operation, pre mixed solid powder and liquid components are added to a rotating cylinder. Under specific temperature and humidity conditions, the liquid forms a thin film on the surface of the powder through the rotation of the cylinder. As the cylinder rotates, particles begin to aggregate and grow, gradually hardening and shaping on the surface, ultimately forming the desired granular fertilizer.

Granulation process

Raw material preparation: Firstly, mix various required raw materials (including basic elements such as N, P, K, and other auxiliary components) in a certain proportion evenly to form dry materials.

Stirring and moistening: Add dry materials and a quantitative adhesive solution (such as water or nutrient solution) to the granulator, stir to the appropriate humidity, and let the powder start to agglomerate into clusters.

Granulation: Under the rotating action of the rotary drum granulator, the material flips along with the cylinder, undergoes collision, rolling, and gravity, and small clumps gradually increase to form regular particles.

Curing and Forming: By heating or natural means, the surface of the particles quickly solidifies to prevent adhesion and ensure particle integrity.

Cooling and screening: After granulation is completed, the particles need to be cooled to near room temperature, and then screened to remove oversized or undersized particles to meet the specified particle size requirements.

Coating treatment (optional step): In order to improve the appearance, slow-release performance, or corrosion resistance of fertilizers, qualified particles can be coated.

Finished product inspection and packaging: Finally, quality inspection is carried out on the finished product to ensure that all indicators meet the standards, followed by packaging and preparation for sale.

The granulation process of the compound fertilizer rotary drum granulator not only effectively solves the problems of traditional fertilizers being prone to clumping and difficult to dissolve, but also customizes the size, shape, and nutritional composition of particles according to the needs of different crops, greatly improving the efficiency of fertilizer use and crop yield, and playing an important role in promoting the development of modern agriculture.