Powder of Bauxite
Mixed at high T with a
NaOH under pressure
Get sodium aluminate
and through filters
The aluminate solution
+ very fine and pure
particles of aluminum
trihydrate are added as
"seed“ in the
Precipitator
Pure aluminum
trihydrate precipitates
on the "seed"
Then separated from NaOH by settling and filtration.
Heating to 1000-1100 degrees C in the Kiln to drive off the
chemically combined water
Get fine white powder of Alumina for the electrolytic smelting
process