Ceratizit Austria Gesellschaft M.b.h.

Ceratizit Austria Gmbh

Erwin Hartlmayr

Andreas Lackner

Helmut Beirer

Wolfgang Glätzle

Gerhard Knünz

Gerhard Kn&uuml;nz

Wolfgang Gl&auml;tzle

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.

Method for producing hard metal granulate

A hard metal grade powder is produced from hard material, metal binder, and non-water-soluble pressing aid components, by forming a slurry containing the components and pure water as a liquid phase and then drying the slurry. Here, the hard material and metal binder components are first milled in water, to form a slurry. Then the pressing aid components are added to the slurry in the form of an emulsion produced with the aid of an emulsifier with the addition of water.

Method of producing hard metal grade powder

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Breitenwang/Tirol, Austria

Erwin Hartlmayr