Improvements relating to the Manufacture of Steel.
Year: 1891

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to the Manufacture of Steel.
We COMPAGNIE DES HAUTS-FOURNEAUX, FORGES ET ACIERIES DE LA
MARINE ET DES CHEMINS DE FER, of St. Chamond, in the Republic of France,
do hereby declare the nature of this invention to be as follows:-
_
Our invention relates to the manufacture of steel and has for its object to
desulphurize the materials upon the sole of a steel furnace, which result has not
heretofore been obtained in the manufacture of steel upon the sole.
For the desulphuration it is necessary either at the moment of or after the fusion"
of the pig iron or other materials to bring the same in contact with the molten scoria
the composition of which is suitable for the absorption of the sulphur.
We obtain the said result by the use of as fusible a scoria as possible and of
materials reduced to a suitable size and mixed together at the moment of charging..
On the other hand it is necessary that this compound shall, with a view to the
absorption of the sulphur have in its entirety definite proportions that is to say,
silicium, about 12 per cent., earthy or alkaline earthy bases about 65 per cent.,
various metallic oxides about 10 per cent.
The property of absorption will necessarily be accentuated by the presence,
amongst the metallic oxides, of manganese or any other metal having a strong
affinity for sulphur.
In this desulphuration the proportions of sulphur in the materials to be purified
may vary as long as the quantity of scoria employed is proportioned to the quantity
of sulphur to be removed. The weight of the basic scoria to be formed may reach
from 20 to 30 per cent. of the weight of the pig iron.
The desulphuration is generally terminated when the charge is entirely fused.
Then the cleaning may be effected and a fresh scoria formed for carrying out the
operation, especially if it is necessary to subject also the molten materials to a
dephosphorizing treatment. This latter offers no difficulty and is carried out as is
ordinarily the case when there is no preliminary desulphuration to be effected.
Dated this 16th day of November 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements relating to the Manufacture of Steel.
We COMPAGNIE DES HAUTS-FOURNEAUX, FORGES ET ACIERIES DE LA
MARINE ET DES CHEMINS DE FER, of St. Chamond, in the Republic of France,
5 do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
Our invention relates to the manufacture of steel and has for its object to

page_text: desulphurize the crude metal upon the sole of a steel furnace, which result has not
heretofore been obtained in the manufacture of steel upon the sole.
For the desulphuration it is necessary either at the moment of or after the fusion
of the pig-iron or other materials to bring the same in contact with molten scoria
the composition of which is suitable for the absorption of the sulphur.
We obtain the said result by the use of as fusible a scoria as possible and of
materials reduced to a suitable size and mixed together at the moment of charging.
On the other hand it is necessary that this compound shall, with a view to the
absorption of the sulphur, have in its entirety definite proportions, that is to say,
silicium about 12 per cent., earthy or alkaline earthy bases about 65 per cent., and
various metallic oxides about 10 per cent.
The property of absorption will necessarily be accentuated by the presence,
amongst the metallic oxides, of manganese or any other metal having a strong
affinity for sulphur.
In the process of desulphuration the proportions of sulphur in the materials to be
purified may vary as long as the quantity of scoria employed is proportioned to the
quantity of sulphur to be removed. The weight of the basic scoriæ to be formed
may equal from 20 to 30 per cent. of the weight of the pig iron.
The desulphuration is generally terminated when the charge is entirely fused.
Then the cleaning may be effected and a fresh scoria formed for carrying out the
operation more especially if it is necessary to subject the molten materials to a
dephosphorizing treatment also. This latter presents no difficulty and is carried
out as is ordinarily the case when there is no preliminary desulphuration to be
effected.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is :-
The desulphuration upon the sole of the furnace, of different molten materials
employed for the manufacture of steel, this desulphuration being effected by putting
these materials at the moment of or after the fusion in contact with molten slag of
suitable composition for absorbing definite sulphur compounds.
Dated this 3rd day of August 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.