Production & Uses of High Purity High Alpha Calcined Alumina

Hi Friends,
In present post, we will discuss the specifications, applications and production process route for High purity high alpha calcined alumina.

Product Specifications:
Total Al2O3 : 99.99% min.
Alpha Al2O3: 99.5% min.
SiO2: 0.010% max.
Fe2O3: 0.010% max.
Porosity : 60-75%,
BET surface area: 5 to 10 m2/g,
Water absorption: 1% max.


Input Raw Material: 
High purity hydrate.


Production Process Route:
Mainly two process steps are followed for production of high purity high alpha grade of specialty calcined alumina as described here under-


Step-I : Calcination of High purity hydrate in Rotary kiln at around 1650-1700 degree C.
Step-II: Micronisation of calcined alumina either by jet milling or grinding in ceramic lined Ball mill.


Applications:

• Abrasives for magnetic tape,
• Watch jewels,
• Ceramic balls,
• Fibre connectors,
• High strength ceramic tools,
• Translucent tubes for high pressure sodium lamps,
• Precision polishing,
• Technical ceramics and
• Catalyst support for production of Ethylene oxide.

Trust, the useful data / informations have been presented to the extent possible. However, further details with process flow sheet and list of equipment with broad specifications shall be published in future posts.

Please put your views / remarks / suggestions / remarks / comments, if any.

Regards.

Kunwar Rajendra