Rotary Drum Granulator For Compound Fertilizer Making

Compound fertilizers have always been popular in the fertilizer market due to their large content and fast fertilizer effects. The fertilizer drum granulator is an important equipment for the production of compound fertilizer granules. Then how does rotary drum pellet making machine prepare compound fertilizer? You can find the answer from this post.

The working principle of drum granulator

Drum granulator in the pelleting process of compound fertilizer particles: the core is the small particles with a diameter of Ф1-2mm in the raw materials and returned materials, under the temperature and steam conditions of 60-65°C, with the help of the raw materials’ own viscosity and mechanical The interaction of forces will continue to roll and form soft particles of Ф2-5mm. When drying, with the evaporation of water, the particles will gradually solidify and form hard particles. This is the whole working process of rotary drum granulation.

How to improve pellet quality in rotary drum granulation

There are some tips for better rotary drum fertilizer granulation.

When granulating, the material should make an elliptical movement in the granulator or dryer. The material should occupy 1/6 of the cross-sectional area of the cylinder. Through the movement, the materials will rub against each other to produce stickiness, large absorption and small adhesion, and adhesion. into balls. The material should be smooth in motion, and should not be subjected to excessive impact or forced into a ball, otherwise the particle size will be uneven.

The way to improve the roundness of fertilizer pellets is to let the material roll and rub more before the particles are solidified. During the rolling, the surface of the particles is ground to remove the edges and corners, to fill in the gaps, and the more the roll is, the more round it is. Soft particles should not rise and fall vertically in the cylinder of drum pelletizer, otherwise it is easy to cause deformation of the particles and cause the particles to be out of round. Click here for more about rotary drum granulation.

Fertilizer granules produced by rotary drum granulator
Fertilizer granules produced by rotary drum granulator

In the process of processing compound fertilizers, drum granulators should use low temperature and large air volume to minimize the temperature difference between the drying head and tail. Tail temperature is the focus of control, generally controlled at 45-65°C, urea dosage is 3-9%, tail temperature is controlled at about 65°C; urea dosage is 10-20%, tail temperature is controlled at about 60°C; urea dosage is 21 -38%, the tail temperature is controlled at about 55°C, to prevent the urea from being too high in temperature to melt and produce too much liquid phase, resulting in large particles or sludge. If ammonium chloride is used as the nitrogen source, the tail temperature can be controlled at about 65-80°C, and the drying tail temperature should be formulated and adjusted according to the output size and the actual situation of the equipment. The drying temperature is not fixed. It should be determined mainly by referring to the air volume of the system, the production formula and the drying conditions of the dried materials. The organic coordination of the moisture, temperature and drying temperature of the materials in the granulator is the key. If you are interested in this fertilizer processing machine, you can visit for more details.