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Scientific American Supplement, No. 829, November 21, 1891 by Various
page 121 of 146 (82%)
falls to 0.03 per cent. The iron in the vessel remains sufficiently
fluid for several hours. When necessary, a little wood is thrown in.
It has been found quite unnecessary to obtain heat by passing and
burning a current of gas above the bath of metal.

A number of results, showing the separation of sulphur at the Hoerde
Works, was published a few months ago[2] by Professor P. Tunner, one
of our honorary members.

[Footnote 2: "Oesterreichische Zeitschrift fur Berg und
Huttenwesen," 1891, No. 19.]

The totals represent, respectively, 138,500 kilogrammes of pig iron
and 98,654 kilogrammes of sulphur.

Thus, from 138,500 kilogrammes of pig iron there has been eliminated
179,577-98,654 = 80,923 kilogrammes of sulphur, or, in other words,
45.063 per cent.

The proportion of sulphur in the slags rises with that in the iron
from the blast furnace to 17 per cent., an inappreciable portion of
the sulphur of the slag being oxidized to sulphurous anhydride by
access of air. An analysis of the slag yielded the following results:

Per cent.
Sulphur 17.07
Manganese 30.31
Phosphoric anhydride 0.61
Iron 7.13
Bases 35.04
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