2025/11/11
Drum granulation is mainly divided into two types: wet drum granulation and dry drum granulation. The core difference lies in whether a liquid binder is added and the characteristics of the applicable raw materials:
1. Wet Drum Granulation: Water, steam, or a special binder (such as starch solution) is sprayed onto the dry powder raw material inside the drum. After the material is moistened, it is bound into granules by the friction and centrifugal force of the rotating drum. Suitable for raw materials with low moisture sensitivity (such as organic fertilizer and compound fertilizer). The material has a high moisture content during granulation (usually 15%~25%), requiring subsequent drying to reduce moisture. Advantages include high granulation rate (up to 80% or more) and rounded granules; disadvantages include the need for drying equipment and higher energy consumption.
2. Dry Drum Granulation: No liquid is added. The raw material relies directly on its own plasticity or is pre-compressed into blocks under high pressure, then crushed and rounded into granules by the drum. Suitable for dry powder raw materials with a certain degree of plasticity (such as some mineral fertilizers and catalysts). The material has a low moisture content (usually ≤5%) and does not require drying. The advantages are a simple process and low energy consumption, making it suitable for moisture-sensitive materials; the disadvantages are a relatively low granulation rate (60%~70%) and lower particle hardness.
Both types achieve material agglomeration and shaping through drum rotation. The specific choice depends on the raw material characteristics, moisture requirements, and production energy consumption budget.
We can provide complete fertilizer granulating produciton lines, including rotary drum granualtors and fertilizer dryers.
