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WRA Calcined Alumina

Oxide Analysis Formula
CaO 0.02% 0.00
Na2O 0.10% 0.00
Al2O3 99.70% 1.00
SiO2 0.02% 0.00
Fe2O3 0.02% 0.00
LOI0.10%
Oxide Weight 102.16
Formula Weight 102.27

Notes

This is an intermediate soda, medium crystalline 3rd generation calcined
alumina.
WRA A-17 A-16
Ultimate crystal size d50-Eppendorf, microns: 2.5-3.2 3.0-3.5 .3-.5
Al2O3 99.5+ 99.5+
SiO2 .02 for A17, .01 for A16
Fe2O3 .01 for all
Na2O3 .08 for A17 and A16
Specific surface area: BET, m2/g .5-.8 3 3-7
Aggregate size, % for WRA: >150 micron 1-10, >63 " 60-80, >40 70-95
Grinding time, Hrs: 4 for A17, 16 for A16
Green density, g/cc: 2.15 for A16, 2.5 for A17
Fired density, g/cc: 3.88 for A16, 3.75 for A17

From Aluminum Company of America
1501 Alcoa Building
Chemicals Division
Pittsburg, PA 15219

Related Information

Links

Typecodes Alumina
Alumina products
Glossary Calcination
Calcining is simply firing a ceramic material to create a powder of new physical properties. Often it is done to kill the plasticity or burn away the hydrates, carbonates, sulfates of a clay or refractory material.

By Tony Hansen


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