Generally, there is no need of a binder for compaction-granulation of powders and the bonding of particles is ensured by the mechanical pressure exerted on the product being compacted. The compacts produced at low or high pressure are in flake form of variable thickness (up to 30 mm).
According to the material and the end-product required, the main stages of the process can be as follows :
A preparation unit for powders (screening-crushing, drying, sieving) A weighing and mixing unit of the components
A compaction unit transforming the powders into flakes
A granulation-screening unit converting the flakes into granules of the required size
And for some plants and in particular for the production of compacted fertilizers, a finishing unit with polishing and coating of granules for improved appearance, reduced amount of residual fines and easier storage
The capacity of a compaction-granulation line can range from 50 kg/h to 50 T/h of granules and for products up to 200° C or even more.