product Overview
  Extrusion granulation is a relatively new dry granulation process to produce compound fertilizers. Extrusion granulation has long been applied to the granulation of potassium chloride in the fertilizer field. The granular (1-4mm) potassium chloride required for blending fertilizers (BB fertilizer) is basically produced by extrusion. In recent years, extrusion granulation for the production of compound fertilizers has developed rapidly in China.
  There are two forms of extrusion granulation: pair roll type and wheel rolling type. pair roll type extrusion is to first compress them into large pieces and then break them into granules. This way, the device has large capacity, high granule strength, and low energy consumption. Double roll extrusion is widely used abroad. The wheel rolling type is to directly make the surface of the roll into a grooved shape and extrude it into shaped particles at one time. When the product strength is low, binder is sometimes needed. Suitable for making granular fertilizers such as organic fertilizers and compound fertilizers.
working principle
  The process principle of counter-roll extrusion granulation is that dry materials are agglomerated into dense and hard chunks (cake materials) under pressure, which is called the extrusion process; the cake materials are then crushed and screened into granules, which is called the granulation process. The effect of extrusion is to squeeze out the air between the particles, and to bring the spacing between the particles close enough to generate attractive forces such as Van der Waals forces, adsorption forces, crystal bridges and embedded connections. The extruded and granulated granules are mainly the strength of the granules formed by the force between molecules.

schematic structural diagram

technical specifications