The granulation process of Double Roller Press Granulator and Rotary Drum Granulator is different. The Double Roller Press Granulator belongs to dry granulation, while the Rotary Drum Granulator belongs to wet granulation. There are obvious differences between dry granulation and wet granulation:
- Working principle
Dry granulation is a process in which dry organic materials are directly pressed into granules by physical extrusion, compression, etc., without the addition of wetting agents and adhesives, and the original nutrients and physical properties of the materials are retained.
Wet granulation is the process of adding an appropriate amount of wetting agent or adhesive to the organic material and making granules through stirring and mixing. The addition of wetting agents helps the formation and stability of material particles.
- Process characteristics
The dry granulation process is simple, energy-saving, and does not require additional drying steps, thereby reducing production costs. In addition, dry granulation can effectively retain nutrients such as nitrogen, phosphorus, and potassium in organic materials, making fertilizers easier for plants to absorb and utilize. At the same time, the granules made by the dry method have high hardness, high density, good stability, and are easy to store and transport.
Wet granulation adds a wetting agent, which significantly improves the forming rate of material particles and improves the quality of particles. In addition, the granular fertilizer made by wet granulation has a certain toughness, which is conducive to the rapid decomposition and release of nutrients. At the same time, because the material is in a wet state during the wet granulation process, the generation of dust is reduced and the working environment is improved.
- Applicable scenarios
Dry granulation is suitable for organic materials with low moisture content, such as straw, sawdust, etc. The granular fertilizer produced is suitable for long-term fertilization, which can continuously provide nutrients for crops and promote crop growth.
Wet granulation is more suitable for processing organic materials with high moisture content and the pursuit of rapid nutrient release. At the same time, wet granulation can effectively reduce harmful microorganisms and pathogens in organic materials and improve the safety of fertilizers.
In general, both dry granulation of Double Roller Press Granulator and wet granulation of Rotary Drum Granulator are very important fertilizer production methods. In actual production, it is necessary to select appropriate granulation equipment according to the nature of organic materials, production needs, etc.