4%
Silica 32.6
Fluorine 20.6
-----
108.6
The oxygen equivalent to 20.6 per cent. fluorine may be found by
multiplying the percentage of fluorine by 0.421; it is 8.7 per cent.,
and must be deducted. The analysis would then be reported thus:--
Alumina 55.4%
Silica 32.6
Fluorine 20.6
-----
108.6
Less oxygen equivalent to fluorine 8.7
-----
99.9
Take as an illustration the following actual analysis by F.W. Clarke and
J.S. Diller:--
Alumina 57.38%
Silica 31.92
Fluorine 16.99
Potash 0.15
Soda 1.33
Water 0.20
------
107.97
Deduct oxygen equivalent 7.16
------
100.81
In calculating the factor for the "oxygen equivalent," divide the weight
of one atom of oxygen (16) by the weight of two atoms of the halogen;
for example, with chlorine it would be 16/71 or 0.
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