Background

Freeze granulation has shown to be a competitive technique for the manufacture of granules for pressing owing to its ability to preserve the material homogeneity and enhance the pressing performance.

  • Small granule quantities as well as larger ones can be produced with equal properties
  • The granule density can be controlled by the solid content of the powder suspension to be granulated
  • The mild drying provides a low degree of oxidation of non-oxide ceramics or metals and gives soft granules that are easily broken during pressing or re-dispersed to a suspension
  • A working prototype of the first large-scale Production Granulator, PS-20
  • FG-system for processing in organic media, ex in Cyclohexane and tert-amylalcohole.
Granule Properties
Free-flowing granules with a wide granule size distribution (10–700 micron). Lower granule and tap density vs spray-dried granules. Spray-frozen and freeze-dried granules of a composite material, see photo below.
Background of granule-properties

Granulation (Granulating) and Drying of Powders

Freeze granulation of powders

Pressing is the dominating shaping technique for ceramics and powder metals. Submicron and/or composite powders require adequate preparation to achieve pressing performance that ensures dense compaction into a homogeneous state prior to sintering. The unique benefit with the Freeze Granulation technology is to make “homogeneous granules of mixed nano/micron powders with binders”.