Improvements in Utilising the Bosh Cinder Produced in the Puddling of Iron, and in Puddling and Mill Furnaces to be Employed in Utilising the said Bosh Cinder.
Year: 1894

page_text: Date of Application, 3rd Sept., 1894
Complete Specification Left, 13th Nov., 1894-Accepted, 15th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Utilising the Bosh Cinder Produced in the Puddling
of Iron, and in Puddling and Mill Furnaces to be Employed in
Utilising the said Bosh Cinder.
I, WILLIAM ROBERTS, of No. 75 Horseley Road, Tipton, in the County of
Stafford, Roll Turner do hereby declare the nature of this invention to be as
follows:-
In order that my invention may be the better understood I remark that in
puddling iron there is produced slag commonly called tap cinder which tap cinder
is run off from the bed of the puddling furnace and being rich in iron is mixed with
the charge of the blast furnace in order to recover the iron therefrom. In the process
of puddling the puddler stirs or kneads the mass of semi-liquid iron by the use
of a tool called a rabble. The said rabble becomes rapidly coated with the
said slag and in order to remove the slag from the rabble the puddler plunges the
coated rabble from time to time in water contained in a bosh or tank thereby
solidifying and cracking the slag which falls from the rabble to the bottom of the
said bosh or tank in the form of a powder. This powder, commonly called bosh
cinder, has the same or nearly the same composition as tap cinder, that is, it is rich
in iron but cannot be conveniently used in the blast furnace in the form in which
it is deposited in the tank. The said bosh cinder is consequently a residual
product having little or no commercial value and my invention consists primarily in
utilising in the manner hereinafter described the said bosh cinder so as to make it
suitable for introduction into the blast furnace for recovering the contained iron
therefrom. This I effect by melting the said bosh cinder in the neck or flue of
puddling or mill furnaces by the waste heat of the said furnaces the fused bosh
cinder running from the flue or neck of the furnace into a receptacle under the
chimney.
In improving puddling and mill furnaces according to my invention I make in
one or both sides of the flue or neck of the furnace and preferably near the top
thereof one or more openings for the introduction of the bosh cinder. These
openings may be of the size and shape of the bricks of which the flue or neck is
built so that after the introduction of the bosh cinder the said openings may be
closed approximately air tight by means of bricks. I line the bottom and sides of
the neck or flue of the furnace with a basic lining by the use of which a considerable
ourification of the melted bosh cinder is effected. The melted cinder runs from the
eck or flue of the furnace into a receptacle under the chimney of the furnace
here it cools and solidifies and from which it is removed to be used in the same
vay as tap cinder.
Dated this 3rd day of September 1894.
W. T. WHITEMAN,
Agent for the Applicant.

page_text: CUMI LEIM
Improvements in Utilising the Bosh Cinder Produced in the Puddling
of Iron, and in Puddling and Mill Furnaces to be Employed in
Utilising the said Bosh Cinder.
I WILLIAM ROBERTS, of No. 75 Horseley Road, Tipton in the County of
Stafford, Roll Turner do hereby declare the nature of my invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
In order that my invention may be the better understood I remark that in
puddling iron there is produced slag commonly called tap cinder which tap cinder
is run off from the bed of the puddling furnace and being rich in iron is mixed with
In the
the charge of the blast furnace in order to recover the iron therefrom.
process of puddling, the puddler stirs or kneads the mass of semi-liquid iron by
the use of a tool called a rabble. The said rabble becomes rapidly coated with the
said slag and in order to remove the slag from the rabble the puddler plunges the
coated rabble from time to time in water contained in a bosh or tank thereby
solidifying and cracking the slag which falls from the rabble to the bottom of the
said bosh or tank in the form of a powder or scale. This powder or scale
commonly called bosh cinder, has the same or nearly the same composition as tap
cinder, that is, it is rich in iron but cannot be conveniently used in the blast
furnace in the form in which it is deposited in the tank. The said bosh cinder is
consequently a residual product having little or no commercial value and my
invention consists primarily in utilizing in the manner hereinafter described the
said bosh cinder so as to make it suitable for introduction into the blast furnace
for recovering the contained iron therefrom. This I effect by melting the said bosh
cinder in the neck or flue of puddling or mill furnaces by the waste heat of the said
furnaces, the fused bosh cinder running from the flue or neck of the furnace into a
receptacle under the chimney.
In improving puddling and mill furnaces according to my invention I make in
one or both sides of the flue or neck of the furnace and preferably near the top
thereof, one or more openings for the introduction of the bosh ciuder. These
openings may be of the size and shape of the bricks of which the flue or neck is
built so that after the introduction of the bosh cinder the said openings may be
closed approximately air tight by means of bricks. The bottom and sides of the
neck or Hue of the furnace may be lined with a basic lining by the use of which a
considerable purification of the melted bosh cinder is effected. The melted cinder
runs from the neck or flue of the furnace into a receptacle under the chimney of the
furnace where it cools and solidifies and from which it is removed to be used in the
same way as tap cinder.
I will now proceed to describe with reference to the accompanying drawings the
manner in which my invention is to be performed.
Figure 1 represents in side elevation; Figure 2 in vertical section and Figure 3
in horizontal section, a puddling furnace, the flue or neck part of which is
constructed according to my invention for melting and utilizing bosh cinder
Figure 4 represents a cross section of the same taken through the modified or
improved neck or flue of the furnace; Figure 5 represents in perspective one of the
stoppers of the charging holes; Figure 6 represents in plan and section the
water bosh or tank used near the puddling furnace in the water in which bosh
or tank the heated and tap cinder coated rabble is plunged for removing the cinder
therefrom; Figure 7 represents the rabble and Figure 8 the same coated with the
tap cinder after its removal from the puddling chamber and before it is plunged into
the water bosh or tank to detach the cinder therefrom. In Figure 6 the cinder

page_text: coated rabble is represented plunged into the water bosh for detaching the cinder
therefrom.
The same letters of reference indicate the same parts in the several figures of
the drawings.
a is the puddling chamber of the puddling furnace and 6 is the modified or
improved neck or flue through which the flame and products of combustion from
the puddling chamber a pass on their way to the chimney or stack c, the said waste
heat being utilized for the melting of the bosh cinder charged into the improved
neck or flue b. The said neck or flue is specially constructed for the reception of
the bosh cinder that is to say, the bottom of the said neck or flue is made deeper
than usual and the deep bottom is converted into a bath or chamber marked e for
receiving the bosh cinder to be melted; the said bath or chamber e may be lined
with a basic lining f It will be seen that the neck or flue thus constructed for the
reception of the bosh cinder also gives additional space for the passage of the
waste heat over the said cinder the lining on the bath or chamber e preserving it
from the action of the flame as well as purifying the bosh cinder. The depth of
the bath or chambere may be varied according to the quantity of the bosh cinder
required to be melted at eac: "heat" of the puddling furnace. The back angies
of the bosh cinder melting bath or chamber e are built or filled in at and in the
built in part the tapping hole is made by which the melted cinder is tapped out
of the bath or chamber e, a spout forming a continuation of the tapping hole
being used to facilitate the running of the melted bosh cinder into a waggon or
receptacle placed to receive it at the chimney end of the furnace. Or the tapping
hole and spout may be arranged at one or at both sides of the modified neck or
flue b. In Figure 1 a side tapping hole and spout are indicated in dotted lines."
By closing or building up the back angles of the chamber or bath e as represented
the melted cinder cannot accumulate at that part and as the tapping hole is made
in the built up part, which is kept at a high temperature by the waste heat
impinging on it, the tapping out of the melted cinder is facilitated. The tapping
hole may be closed during the melting of the bosh cinder by a stopper; or the
tapping hole may be left open during the melting operation so as to obtain a
continuous flow of the melted bosh cinder from the bath or chamber e. The bosh
cinder is charged into the bath or chamber e in the neck or flue of the puddling
furnace at the charging holes k, k which are closed during the melting of the said
cinder by the brick like stoppers L. For the purpose of readily placing the stoppers
in and removing them from the charging holes, each stopper has shrunk upon it a
wrought iron frame m and handle . By means of the said handle, the stopper
can be introduced into the charging hole in an inclined position as represented in
Figure 4 so as practically to close airtight the said charging hole.
33
In carrying my invention into effect I proceed as follows. The bosh cinder in
powder or scale, which has been collected from the bosh or tank Figure 6 during
previous heats of the puddling chamber, is charged through the holes k, k into the
bath or chamber e in the flue or neck of the furnace and the said charging
holes closed by the stoppers 1, 1; the tap hole is also closed. The puddler
then charges his "heat of pig iron into the puddling chamber a and proceeds in
the ordinary way to heat and puddle the said charge of pig iron. During the
puddling process the waste heat from the puddling chamber passes into the
improved neck or flue and melts the bosh cinder in the bath or chamber e. After
the puddling operation is complete, the melted bosh cinder is tapped out at the
tapping hole and spout h, into a waggon or other receptacle situated at the
chimney end of the furnace. In this waggon or receptacle the melted bosh cinder
cools and solidifies. The bosh cinder thus utilized is considerably purified when
the bath or chamber e is lined with a basic lining and the bosh cinder which has
thus been treated is used in the blast furnace in the same way as tap cinder.
1 modify the neck or flue of mill furnaces for utilizing bosh cinder substantially
in the manner hereinbefore described and illustrated with respect to a puddling
furnace.

page_text: Having now particularly described and ascertained the nature of my invention
and in what manner the same is to be performed I declare that I claim as my
invention of "Improvements in utilizing the bosh cinder produced in the puddling
of iron and in puddling and mill furnaces to be employed in utilizing the said bosh
.cinder ;-
"
First. Utilizing bosh cinder by melting or melting and purifying it in a bath or
chamber formed in the neck or flue of a puddling or mill furnace whereby the
waste heat of the said puddling or mill furnace is utilized for the melting of the
said bosh cinder substantially as hereinbefore described and illustrated in the
accompanying drawings.
Secondly. Converting the neck or flue of a puddling or mill furnace into a
melting chamber to be employed in the utilizing of bosh cinder substantially as
herein before described and illustrated in the accompanying drawings.
Dated the Twelfth day of November 1894,
WILLIAM ROBERTS.