IMPROVEMENTS IN THE PURIFICATION OF IRON ORES, AND OF IRON, BY THE BASIC PROCESS
Year: 1884

page_text: I, WILLIAM PHILLIPS THOMPSON, Fel. Inst. P.A, of the Agency for foreign
Patent Solicitors, 6, Lord Street, Liverpool, in the county of Lancaster, Civil
Engineer do hereby declare the nature of the said invention for " IMPROVEMENTS
IN THE PURIFICATION OF IRON ORES, AND OF IRON, BY THE BASIC PROCESS "
(a communication from Herr Rudolph Sohliwa of Dortmund in the Empire' of
Germany) to be as follows:
This process is applicable to the purification of iron ores and of iron containing
sulphur and silicon in any proportion and which is under treatment by the Thomas
and Gilchrist process, and is moreover advantageous in diminishing the loss,
increasing the resistance of the basic lining inside the convertors and reverberatory
furnaces, and obtaining slags which contain phosphoric acid soluble in water.
The bottom of a convertor lined with magnesia-lime is covered with a layer of
a carefully prepared mixture consisting of two parts of pulverized anhydrous
carbonate of soda, and of one part of pulverized caustic lime, and after the beginning
of the blowing operation so much of this mixture is given to the crude iron, that
the total weight of the mixture under treatment is in the same proportion to the
alloy of silicon in the whole charge of crude iron as are two parts of silicon to one
part of carbonate of soda, and one half part of caustic lime..
After two minutes blowing, or rather after the. formation of the silicates, and
when the slags seem sufficiently fluid, the latter are removed, and when this has
been done for every three parts of sulphur in the crude iron, 10 parts of carbonate
of soda (without lime) are added to the mass and the blowing continued until
decarbonization.
The slags now formed are removed, and 10 parts of carbonate of soda. (without
lime) on every 3 parts of phosphorous contained in the crude iron are added to the
mass. After finishing the blow, the slags for the third time are removed and
together with the slags taken out for the first time, they are separated as
phosphorous slags.

page_text: .
COMPLETE SPECIFICATION.
"
I, WILLIAM PHILLIPS THOMPSON, Fel. Inst. P.A., Agency for Foreign Patent
Solicitors, C, Lord Street, Liverpool, Lancashire, Civil Engineer, do hereby declare
the nature of the said invention for "IMPROVEMENTS IN THE PURIFICATION OF
IRON ORES, AND OF IRON BY THE BASIC PROCESS (a communication from abroad
by Herr Rudolph Schliwa, Dortmund, Germany,) and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :-
The said invention comprises an improved process which is applicable for the
purification of iron ores and of iron containing sulphur and silicon in any quantity
when under treatment by the Thomas and Gilchrist process; and is moreover,
advantageous in diminishing the waste of iron increasing the resistance of the basic
lining inside the converters and reverberatory furnaces, and obtaining slags which
contain phosphoric acid, or phosphates soluble in water.
In practically carrying out the invention, the bottom of a converter lined with
magnesia lime is covered with a mixture consisting of two parts of pulverized
anbydrous carbonate of soda, and one part of pulverized carbonate of lime, and
after the beginning of the blowing, so much more of this mixture is added to the
crude iron as will make the total weight of the mixture under treatment, in the
proportion to the silicon in the whole charge, of crude iron, as one part, of carbonate
of soda, and one half part of carbonate of lime to every two parts of silicon.
After about two minutes blowing or rather after the formation of the silicates,
and when the slag seems sufficiently fluid, the slag is removed as completely
as is conveniently possible, the object of thus removing the slag being to avoid
resilication of the iron. When the slag has been removed, for every three parts
of sulphur in the crude iron, ten parts of carbonate of soda (without lime) are
added to the molten metal, and the blowing is continued until decarburation is
effected.
After
The slag now formed is also removed as completely as is conveniently possible;
and then ten parts of carbonate of soda (without lime) for every three parts of
phosphorous contained in the crude iron are added to the molten mass.
finishing the blow, a removal of slag is effected for the third time, and this slag,
together with that taken out the first time is afterwards treated as phosphatic
Blag.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The desilication of crude iron by applying carbonate of soda and carbonate of
lime, and by removing the slag, so as to avoid resilication, substantially in the
manner hereinbefore described.

page_text: 2. The desulphuration of crude iron, by applying carbonate of soda, substantially
in the manner herein before described.
3. The dephosphorization of crude iron, by applying carbonate of soda after
removing slags containing silicon and sulphur, substantially in the manner
hereinbefore described.
Date :
كيم