How to choose granulating method for different fertilizer materials?
The difference between granulation methods is to select the appropriate granulation methods according to the requirements of the materials. They are mainly divided into two categories: dry granulation and wet granulation
Dry granulation method
It mainly refers to the products with low moisture content. Generally, the moisture content below 10% is a zero boundary value. (there are also very few materials up to 16%, such as: some materials only contain crystal water) dry granulation produces irregular particles (such as common granular potassium fertilizer) or more commonly, small crushed stones with similar shapes. With the current domestic industrial upgrading and environmental protection requirements more and more strict, many chemical, building materials powder need to create particles.
Wet granulation method
The main index moisture content is more than 20%, wet granulation also has many kinds of equipment and methods. Such as: disc granulation, roller granulation, screw granulation, these methods have been continued many years ago, after increasing the use of different materials and processing requirements in the continuous improvement, also has a considerable development. For example, the granulation of organic fertilizer in recent years, the particle size is more than 1 mm-6 mm, and the above methods are used.
In the organic fertilizer granulator, the energy consumption of dry granulation is lower than that of wet granulation, and it is more environmentally friendly. There is no need to dry, add water and binder, so the material properties will not be changed. This is also the advantages of dry granulation different from wet granulation. It is more suitable for industrial mass production.
There is also a case where some materials require smaller particle sizes. Products can also be reduced by air flow, spray and flash drying between dozens of mesh and one hundred mesh.
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