Ceratizit Austria Gesellschaft M.b.h.

Gerhard Knünz

Andreas Lackner

Wolfgang Glätzle

Helmut Beirer

Erwin Hartlmayr

A hard metal granulate is produced by wet milling and spray drying in a spray tower using pure water as the liquid phase. The spray tower is configured and operated in such a way that a ratio of the quantity of water added via the slurry (in liters per hour) to tower volume (in m) is between 0.5 and 1.8 and in that a maximum of 0.17 kg of slurry is atomized per mof incoming drying gas. The slurry has a solid particle concentration within a range of 65-85% by weight. Under these conditions, the addition of a water-soluble, long-chain polyglycol to the slurry prior to spraying previously required in order to prevent oxidation of the hard metal granulate is no longer necessary.

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Lechaschau/Tirol, Austria

Gerhard Knünz