Changzhou, Jiangsu, China
Member Since: 2019
Business Type: Manufacturer/Factory
Extrusion granulation is a relatively new dry granulation process for producing compound fertilizers. Extrusion granulation was first applied to the granulation of potassium chloride in the fertilizer field. Granular (1-4mm) potassium chloride required for blending fertilizer (BB fertilizer) was basically produced by extrusion. In recent years, extrusion granulation has been used in the production of compound fertilizers and it has been developed rapidly in China.
The form of extruding and granulating can be either roller or rim type. The roller squeezing is firstly compressed into large pieces and then broken into granules. This device has the advantages of large capacity, high grain strength, and low energy consumption. Roll extrusion is widely used abroad. The rim type is formed on the surface of the roll to have a grooving-type shape and is extruded into molding granules at a time. Low product strength sometimes requires the addition of a binder. Suitable for granular fertilizer such as organic fertilizer and compound fertilizer.
The principle of roller extrusion granulation is: dry materials are agglomerated into compact, dense chunks (cakes) under pressure, called the extrusion process; the cakes are then crushed and sieved into pellets. For the granulation process. One of the effects of the extrusion is to squeeze out the air between the particles, and the other is to make the spacing of the particles close enough to produce attractive forces such as van der Waals forces, adsorption forces, crystal bridges, and embedded connections. Extruded pellets mainly rely on the strength of the particles formed by the forces between the molecules.
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