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Pigments

Alumina functions in pigments:
  • Precipitated micronic alumina trihydrate isused with cobalt to obtain the colour blue.
  • Soft calcined alumina is used with manganese to obtain the colour red

 

 

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Standard ceramics
Calcined alumina

Aluminas with intermediate to relatively high specific surface areas (BET 3- 75m²/g) with alpha alumina contents varying between 20% and 95%.These are produced by controlled rotary calcination of aluminium trihydroxide.

AR12B5
Fine alumina hydrate

Aluminium trihydroxide (ATH) produced by the Gardanne Bayer process is subject to controlled grinding to obtain a range of particle size distributions and low viscosity grades.

SH30 SH80
Ground calcined alumina

These aluminas are ground in continuous ball-mills or air-jet mills to median particle sizes (d50) 3, 4, 5 or 6 µm.

AC34B4
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