Why Caking Problem in NPK Fertilizer Production

Fertilizer caking sometimes occurs in NPK fertilizer production. The problem of fertilizer caking usually occurs in the process of fertilizer processing, storage, transportation and transportation. The main reason for this is the moisture absorption, surface dissolution, evaporation and recrystallization of micro-grains of fertilizers. In this process, crystalline bridges are formed, and small grains become large grains and agglomerate. The caking problem of NPK compound fertilizer is mainly related to material (raw material of NPK fertilizer production line), humidity, temperature, external pressure and storage time. So how to solve the problem of fertilizer caking? If you want to avoid caking, you need to know the reason of caking, so as to avoid loss. The following fertilizer machine manufacturers specifically analyses the causes of fertilizer caking.

1. NPK compound fertilizers usually use raw materials such as ammonium salt, phosphate, trace element salt, potassium salt and so on. Most of these materials contain crystalline water and are easy to absorb moisture, such as ammonium sulfate, phosphate and trace elements are easy to agglomerate and become insoluble in water, and urea is easy to precipitate water and agglomerate when it meets trace element salts.

2. NPK fertilizer production equipment processing is generally non-closed production, in the production process, the greater the air humidity, the easier the fertilizer moisture absorption and caking. When the weather is dry or raw materials are dried, the fertilizer is not easy to cake.

granules of double roller press granulatorgranules of double roller press granulator
3. The higher the working temperature of double roller press granulator is, the material is easy to dissolve. Generally, the material dissolves in its own crystalline water and causes caking. When nitrogen temperature is higher, water evaporates and is not easy to agglomerate. The temperature is generally above 50 degrees Celsius. We usually need to heat to reach this temperature.

4. The greater the applied pressure of fertilizer, the easier the contact between crystal and crystal, the easier the caking; the smaller the applied pressure, the more difficult the caking.

5. The longer the fertilizer placement time after the double roller press granulator is made, the easier it is to agglomerate, the shorter the time of placing, the less difficult it is to cake.