IMPROVED MEANS FOR PURIFYING IRON DURING CONVERSION
Year: 1879

page_text: LETTERS PATENT to Frederick Thomas Reade, of King's Bench Walk, Temple,
in the City of London, for the Invention of "IMPROVED MEANS FOR PURIFYING
IRON DURING CONVERSION."
Sealed the 30th March 1880, and dated the 7th October 1879.
PROVISIONAL SPECIFICATION left by the said Frederick Thomas Reade at
the Office of the Commissioners of Patents on the 7th October 1879.
FREDERICK THOMAS READE, of King's Bench Walk, Temple, in the City of
London. "IMPROVED MEANS FOR PURIFYING IRON DURING CONVERSION."
My Invention relates to means of purifying iron while it is undergoing treat
ment in a Bessemer or other converter, my chief object being to eliminate the
phosphorus. In the Specification to Letters Patent granted to me on the 22nd
April 1879, No. 1577, I described for this purpose the mixing of calcareous dust
or powder with the air blast. According to my present Invention I also mix
therewith steam, which may be superheated, so that the blast may consist of a
mixture of air and steam with the calcareous powder suspended therein. For this
purpose I use a double blast pipe leading to the converter, that is, a central pipe of
sufficient diameter for the air blast, and an outer pipe of larger diameter for the
steam blast, these pipes supplying respectively an inner and an outer ring of
tuyere holes. The calcareous powder may be introduced into the internal blast pipe
in the manner described in my previous Specification above referred to, and steam,
which may be superheated, may also be admitted to the said inner pipe, in quantity
regulated by a valve or stop cock, to mix therein with the air and calcareous
powder; or the steam may be caused to carry the calcareous powder with it into
the inner blast pipe in the manner of what is known as the sand-blast.
external pipe leading to the outer ring of tuyere holes is supplied with steam,
which may be supherheated, or with steam having calcareous powder suspended
therein. The proportion of calcareous powder and steam admitted to the molten
metal may be varied to suit the different qualities of iron under treatment, and
they and each of them may be supplied either continuously or intermittently, as
may be found requisite.
The

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frederick Thomas Reade in the Great Seal Patent Office on the
6th April 1880
FREDERICK THOMAS READE, of King's Bench Walk, Temple, in the City of
London, "IMPROVED MEANS FOR PURIFYING IRON DURING CONVERSION."
My Invention relates to means of purifying iron while it is undergoing treatment
in a Bessemer or other converter, my chief object being to eliminate the phos-
phorus. In the Specification to Letters Patent granted to me on the 22nd April
1879, No. 1577, I described for this purpose the mixing of calcareous dust or
powder with the air blast. According to my present Invention I also mix there-
with steam, which may be superheated, so that the blast may consist of a mixture
For this purpose
of air and steam with the calcareous powder suspended therein.
I use a double blast pipe leading to the converter, that is, a central pipe enclosed
in an outer pipe of larger diameter, these pipes supplying respectively an inner and
an outer group or ring of tuyere holes. The inlets to these pipes are connected
with a steam pipe and with an air blast pipe, suitable valves being provided in the
connections so that either may be used for steam or for air blast, or both may be
used as a single blast pipe conveying to the tuyerės either air or steam, or a
mixture thereof.
The calcareous powder may be introduced into the internal blast pipe in the
manner described in my previous Specification above referred to, or the steam may
be caused to carry the calcareous powder with it in the manner of what is known
as the sand blast.
The steam may be superheated, and its quantity, as well as that of the air, may
be regulated by the supply valves above mentioned. The proportion of calcareous
powder and steam admitted to the molten metal may be varied to suit the
different qualities of iron under treatment, and they and each of them may be
supplied either continuously or intermittently during conversion, as may be
required.
Having thus described the nature of my said Invention, and in what manner the
same is to be performed, I claim,―
The use, for purifying iron during conversion, of a blast consisting of air and
stean with calcareous powder, substantially as herein described.
In witness whereof, I, the said Frederick Thomas Reade, have hereunto set
my hand and seal, this Fifth day of April, in the year of our Lord One
thousand eight hundred and eighty.
FREDERICK THOMAS READE. (L.S.)
FREDERICK THOMAS READE. (L.S.)