Mixing and granulation process of high shear mixer granulator
High shear mixer granulator is a highly efficient granulation equipment. It quickly mixes powder, liquid and other materials evenly through high shear force, high-speed rotating mixing head and other means, and makes the fine particles in the material bond to each other through shear force, friction and other effects to form particles.
Mixing process
Introduction and premixing of materials:
Powder materials and liquid binders enter the mixing chamber through the feed port according to the formula ratio.
A premixing device is provided in the mixing chamber to perform preliminary mixing of materials to ensure uniform distribution of materials.
High shear mixing:
The high-speed rotating mixing head (usually gear type or paddle type) generates strong shear force to quickly disperse and mix the materials.
Mechanism of shear force generation:
Mechanical shearing: The mixing head rotates at high speed, and the material is repeatedly sheared between the mixing head and the cavity wall to form fine vortices.
Hydraulic shearing: The liquid binder forms a thin film under the action of the high-speed rotating mixing head, which produces a shearing effect on the solid particles.
Collision shear: Material particles move at high shear mixing granulator in the mixing chamber, collide with each other, and generate shear force.
Material crushing: Under the action of high shear force, large particles are broken into fine particles, which increases the contact area between particles and is conducive to the formation of particles.
Granulation process
Formation of particles: During the mixing process, the fine particles in the material increase their surface area under the action of shear force, friction force, etc., and fully contact with the liquid binder.
The liquid binder forms a liquid film on the surface of the particles, which binds the particles together to form primary particles.
Particle growth: Primary particles continue to be subjected to shear force in the mixing chamber, constantly collide and aggregate to form larger particles.
As the water evaporates, the particles gradually harden to form stable particles.
Particle forming: By adjusting process parameters such as rotation speed, shear time, temperature, etc., the particle size, shape and density of the particles can be controlled.