The granulator used in the compound fertilizer production line is different from that in the pure organic fertilizer production line, because compound fertilizers usually contain multiple chemical elements, and their physical properties and granulation requirements are more complex. The granulation of compound fertilizer should not only consider the adhesion of the material, but also take into account multiple factors such as particle hardness, dissolution rate, and nutrient balance distribution. Therefore, the common types of organic fertilizer granulators in compound fertilizer production lines are as follows:

1. High tower melting granulator

Principle: Dissolve or melt solid raw materials and spray them into a high tower to cool and solidify into particles.

Features: It can effectively integrate multiple chemical substances, with uniform particles and high hardness, suitable for large-scale industrial production.

Scope of application: Suitable for making NPK compound fertilizers and other compound fertilizers containing multiple nutrients.

2. Extrusion granulator

Principle: By using a pair or a set of opposing rotating pressure wheels, the pre mixed material is squeezed through a fixed diameter template hole to form a rod-shaped object, which is then cut into particles.

Features: Suitable for processing materials with certain adhesion and fluidity, high granulation efficiency, and good particle strength.

Scope of application: Widely used in granulation of compound fertilizers, organic fertilizers, and biological fertilizers.

3. Drum granulator

Principle: Place the material into a rotary drum, roll it through rotational motion, and gradually aggregate into circular particles with the help of liquid additives.

Features: Suitable for handling materials that are prone to adhesion, the particle size can be controlled by adjusting the speed and humidification amount.

Scope of application: Suitable for granulation of compound fertilizers, organic fertilizers, and organic-inorganic compound fertilizers, especially when there are special requirements for material adhesion and flowability.

4. Dry granulation machine

Principle: The dry powder material is directly compacted into a plate shape by high-intensity pressure, and then crushed into particles.

Features: No need to add additional water or adhesive, suitable for sensitive materials that cannot come into contact with moisture.

Scope of application: Suitable for compound fertilizers that are sensitive to moisture or require preservation of the original characteristics of the material.

Selection Guide

When choosing a granulator in a compound fertilizer production line, the following aspects should be considered comprehensively:

Raw material characteristics: Understand the physical and chemical properties of the raw material, such as whether it is easy to absorb water, whether it contains corrosive components, etc.

Product quality requirements: Determine the particle shape, size, strength, and solubility requirements of the target product.

Production capacity: Select granulation equipment with appropriate production capacity based on the scale and output requirements of the production line.

Economic cost: Evaluate the equipment purchase cost, operating cost, and maintenance cost, and choose a cost-effective solution.

Environmental protection: Considering the requirements of environmental regulations, choose equipment that can reduce dust emissions and noise pollution.

In short, the selection of granulators in compound fertilizer production lines should be based on comprehensive technical and market analysis to ensure that they can meet the requirements of production efficiency and product quality, as well as economic benefits and environmental standards.