In the field of chemical salt extrusion granulation, common types of machines include roller extrusion granulators, rotary extrusion granulators, screw extrusion granulators, and twin-screw extrusion granulators. Below is a detailed introduction to these machines:

1. Roller Extrusion Granulator
Working Principle:
It extrudes materials by using two relatively rotating rollers, forcing the material through the die holes on the rollers to form granules.
Characteristics:
Simple structure, easy operation, and low maintenance costs.
Suitable for large-scale production with high output.
Different granule sizes can be produced by replacing rollers with varying die hole sizes.
Applications:
Widely used in industries such as chemicals, fertilizers, and building materials, particularly for granulating chemical salts.
2. Rotary Extrusion Granulator
Working Principle:
It utilizes a rotating extrusion disc or extrusion rollers to compress materials, which are then formed into granules through a sieve.
Characteristics:
Low extrusion temperature rise and small die hole sizes, enabling high output.
Particularly suitable for granulating sticky materials, such as certain chemical salts.
Produces uniform granules with stable quality.
Applications:
Extensively applied in industries like chemicals, pharmaceuticals, and food, ideal for producing high-quality granules from chemical salts.
3. Screw Extrusion Granulator
Working Principle:
It pushes materials forward using a screw extruder and forms granules by extruding them through die holes.
Characteristics:
The extrusion screw can be cooled or heated to accommodate different material requirements.
The extrusion barrel features a split structure for easy cleaning and maintenance.
Equipped with a cutting knife to produce short granules of the desired length by adjusting relevant speeds.
Applications:
Suitable for granulating products in numerous industries, including rubber additives, food additives, plastic additives, catalysts, pesticides, dyes, pigments, daily chemicals, and pharmaceuticals, including certain chemical salts.
4. Twin-Screw Extrusion Granulator
Working Principle:
It employs two intermeshing screws rotating in the same or opposite directions inside a barrel, converting raw materials into uniform granular materials through shearing, mixing, and extrusion.
Characteristics:
Excellent mixing effect and high granule quality.
Granulation rate not less than 95%, with regular granule shapes.
Suitable for applications requiring high granule quality.