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Product Overview

　　Extrusion granulation is a relatively new dry granulation process to produce compound fertilizer. Extrusion granulation is the earliest application of potassium chloride granulation in the field of fertilizer. The granular (1-4 mm) potassium chloride required for blending fertilizer (BB fertilizer) is basically produced by extrusion. In recent years, extrusion granulation has been developed rapidly in China for the production of compound fertilizers.

　　The forms of extrusion granulation can be divided into two types: roller-to-roll extrusion and roller-to-roll extrusion. The roller-to-roll extrusion is first pressed into large pieces, and then broken into particles. This device has large capacity, high particle strength, and low energy consumption. The roller-to-roll extrusion is widely used abroad. Wheel rolling is to directly make the roll surface into the shape of a cavity groove, and extrude it into a shaped particle at one time. When the strength of the product is low, it is sometimes necessary to add adhesive. It is suitable for making granular fertilizer such as organic fertilizer and compound fertilizer.

Working principle

　　The technological principle of twin-roll extrusion granulation is: dry materials are agglomerated into dense and hard bulk (cake) under pressure, which is called extrusion process; The cake material is broken and screened to become granular material, which is called granulation process. The role of extrusion is to squeeze out the air between the particles, and to make the particle spacing close enough to generate attraction such as van der Waals force, adsorption force, crystal bridge and embedded connection. The particle strength formed by extrusion granulation mainly depends on the force between molecules.