Definitions for "Alumina"
One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3.
Except in a few sections, this impurity in the boiler water is not troublesome.
A white, powdery substance produced from bauxite by a chemical process during which aluminum oxide is extracted from the ore. Between four and five tonnes of bauxite are required to produce about two tonnes of alumina, which yield one tonne of aluminum.