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Патент USA US2409742

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Oct. 22, 1946. '
H. F. DOBSCHA
2,409,741
SETTLING BASIN FOR BLAST FURNACE CINDER RUNNERS
Filed July 19',‘ 1945
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YI'NVENTOR
, Herman i." Dobscbq
BY
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Oct. 22, 1946.
|-|_ F_ DQBSCHA
‘ 2,409,741
SETTLING BASIN FOR BLAST FURNACE CINDER RUNNERS
Filed July 19, 1945
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'_ INVENTOR
Patented Oct. 22, 1946
.
2,409,741
UNITED‘ ‘STATES PATENT OFFICE
SETTLIN G BASIN FOR BLAST FURNACE
‘
CINDER RUNNERS
Herman F. Dobscha, Pittsburgh, Pa, assignor to
Carnegie-Illinois Steel Corporation, a corpora- ‘
tion of New Jersey
Application July 19, 1945, Serial No. 606,011
11 Claims.
(01. 2_66-—38)
This invention relates to a settling basin for
2
The invention will be more readily understood
by reference to the accompanying drawings, in
the cinder runner of a blast furnace.
The invention has among its objects the pro
vision of a settling basin for the cinder runner
which:
Figure 1 is a view in plan of a portion of a
typical cinder and iron runner system adjacent
of a blast furnace, the settling basin being of
such design that a predominant’ amount of the
the blast furnace, the settling basin of the pres.
iron normally entrained in the molten slag or
ent invention being shown interposed in the cin
cinderfrom the furnace may be recovered directly
der runner from the iron skimmer;
by reason of its separation from the cinder in
Figure 2 is an enlarged view in plan of the
the basin.
10 settling basin shown in Figure 1; and
This and other objects of the invention will be
Figure‘ 3 is a view in cross section through the
more fully apparent in the following description.
settling basin, the section being taken along the
When slag or cinder is run off from a blast
line III—-IIIin Figure 2.
furnace, particularly that slag which has very
In Figure 1 there is shown that portion of the
recently been in intimate agitated contact with 15 cinder and iron runner system adjacent the blast
the molten iron, as, for instance, that skimmed
furnace in a typical blast furnace installation.
off the iron in the iron runner, it is found to con
Blast furnace 2, of which a portion is shown, is
tain mixed or entrained in it an appreciable
provided with an iron notch 4 through which is
amount of molten iron. The amount of iron so
tapped the molten iron, a first cinder notch _6 at
entrained in the slag and carried with it into 20 a level somewhat above the iron notch, and a sec..
the cinder pots is appreciable, reaching ‘values
ond cinder notch 8 somewhat above the ?rst cin
as high as four to ?ve per cent of the total weight
der notch. Molten iron tapped ‘from ‘notch 4
of slag tapped from the furnace when the more ‘
?ows downwardly therefrom‘ through the iron
viscous slags are employed.
order to ‘recover
runner in, whereas the ,cinder tapped from the
such iron, at least in part, it has been the ‘prac 25 two cinder notches .6 and _8 flows through cinder
tice in the past, in the operation of some blast
runners l2 and M, respectively, the ends of which
furnaces, to recover the iron at the slag dump,
merge, .as shown in Figure .1, ‘into a common cin
in the form of “buttons,” into which it has set
der runner 18 to which various branch runners
tled and solidi?ed at the bottom of the cinder
such as 16 are connected to carry the molten cin
30
pots. Although such recovery is ‘economically
der into cinder pots.
feasible, it entails much disagreeable labor and
The iron runner I I] is provided with a skimmer
the added cost of transporting such buttons (back
to the plant and the remelting of them as, for
instance, in the open hearth furnace.
.20 which may be .of variousknowntypcs, of which
that known as the Killeen skimmer or skimmer
The use of the present invention eliminates the
necessity forsu'ch'modeof recovery of the iron ren
The skimmer, ‘which is provided with a trough'
deeper than the bottom of the runner. and with
a partially raised gate to restrain the passage
of cinder down the iron runner, is provided with
‘a dam 22 over which the ,molten iron flows, the
40 molten iron then running into the outeriron run,
‘
ner system consisting of the iron runner main
‘
24 and various branches such as [26, which lead
to the iron ladies.
Connected to the iron runner ‘It at a point
45 adjacent .the skimmer and betwe?n it and the
.blast furnace isa cinder runner 3.9 whichcarries
away the cinder removednom the molten iron in
runner in by the skimmer 2,6. ,Such cinder usu
ally contains by far a greater amount .Of 1811
50 trained iron .than does that in either .of runners
l2 and M, and it is for thisreason, ,thatthere is
‘ connected .to the runner ‘30 ,the .settling basin
32, made in accordance with ,the present inven
trained in the cinder. The settling basin, of ‘the
‘present invention, which may be interposed in
anytof the cinder runners of the blast ‘furnace
where there is the ‘possibility of the presence pi
a ‘material amount of iron in the cinder-run there-
through, shows perhaps its greatest ‘advantages
when placed in the cinder runner leading to the
skimmer in the iron runner. The basinis of such
volume :relative to the area and speed vof ‘?ow-of
the cinder-iron mixture’thereinto that it provides
sui?cient time for substantially all the iron ‘to
settle from the mixture. In addition, the inlet
and outlet runners of {the basin are offset or are
given suchsdifferent directions with respect to
each other that the mixture ?owing into the
basin impinges upon a wall thereof in such man-
her that the mixture is caused to flow generally
circumferentially of the basin, thereby further
aiding in the separation of the iron from the
cinder.
trough shown in Patent ,No. 603,143 is typical.
tion.
'
Runner
which .is ,paralld to the ‘length of
the basin, ‘connects ‘to such ‘basin, ,as ,shown, at
2,409,741
3
the side of one end wall thereof, and the outlet
cinder runner 34 from the basin connects to the
opposite end wall, at a point diagonally opposite
the point of connection of runner 36. In the
modi?cation'shown runner 34 is parallel to run
ner 38. As a result of the above conditions, the
cinder ?owing into the basin from runner 30 is
prevented from ?owing directly through the
basin into outlet runner 34. Instead, it impinges
4
amount of offset, may be materially varied within
the scope of the invention. The main consider
ations are that the basin have sufficient Volume
relative to the volume of flow of cinder into it so
that the velocity of ?ow through the basin is
greatly lower than that through the inlet runner,
that the cinder is prevented from ?owing directly
in a straight line through the basin from the inlet
to the outlet runner, and that preferably it im
10 pinges upon a wall of the basin opposite the wall
through which it enters, so that the cinder in
nected, and at least part of it, as shown in Figure
upon the wall to which the outlet runner is con
the basin is given a swirling movement which still
2, ?ows around the basin in a direction opposite
further aids separation of the iron from the
to the direction of flow out runner 34. Outlet
cinder by reason of the difference in speci?c grav
runner 34 is provided with a dam 35, more plainly
shown in Figures 2 and 3, which prevents the 15 ities of the iron and cinder. Such objects are
accomplished when the inner adjacent walls of
?ow of molten cinder out of the basin until the
the inlet and outlet runners are substantially off
basin is substantially full. Consequently the
set, as shown. In the preferred embodiment, with
mixture of iron and cinder is held in the basin
runners 30 and 34 substantially parallel to each
for an appreciable time, whereby a predominant
amount of the iron entrained in the cinder settles 20 other at their points of connection to the basin,
the amount of offset is such that the areas of
to the bottom of the basin where it forms a pool
flow of cinder into and out of the basin through
of molten iron. At the end of the cast such pool
such runners, respectively, projected within the
of iron is drawn off through the runner 36 by the
basin, are spaced from each other at all points.
raising of the normally closed gate 38, runner 35
being appreciably lower than the bottom of the 25 It will be appreciated, however, that although
the inlet and outlet runners are shown parallel,
basin and being connected thereto by the down
wardly sloping surface 31.
substantially the same results may be accom
plished, provided the other conditions above are
The cinder ?owing through outlet runner 34
observed, when such runners are at an appre
flows into the cinder main runner l8, as shown
in Figure 1, and thence through one of the 30 ciable angle to each other.
Having thus fully disclosed the settling basin
branch runners into a cinder pot. The iron re
for a cinder runner of a blast furnace of the
covered from such cinder in the settling basin and
present invention and the manner in which it
drawn off through runner 36 is led to an iron
operates, I desire to claim as new the following.
runner and thence to a ladle. In the installation
I claim:
shown in Figure 1 runner 36 is connected to iron 35
1._ In the combination of a blast furnace having
runner 49, by which the molten iron remaining
a cinder runner, the improvement which com
in the bottom of the skimmer trough is drained
prises a settling basin connected at one end there
at the end of the cast by the raising of gate 42.
of to the cinder runner, said settling basin having
Thus the recovery of iron from the cinder by the
settling basin enables such iron to be returned 40 a width substantially greater than the width of
the cinder runner feeding the basin, a second
immediately in molten condition to the iron ladle.
cinder delivery runner connected to the opposite
In addition, operation of such basin entails little,
end of the settling basin from the ?rst cinder run
if any, added labor, since it is self-operating but
ner, said second cinder runner being of a width
for the raising of the gate 38 to drain the molten
iron therefrom. Use of the settling basin of the 45 substantially less than that of the settling basin,
the ?rst and second cinder runners at their points
present invention has resulted in a decrease in
of connections to the settling basin being sub
the amount of iron carried by the cinder into
stantially parallel and offset relative to each other
the cinder pots from the previous 4 to 5% to
approximately 0.8% of the slag tapped from the
a substantial distance so that the areas of ?ow
settling basin, which may be made of cast iron,
other at all points.
50 of cinder into and out of the settling basin pro
furnace.
jected within the basin are spaced from each
In the particular embodiment illustrated, the
2. In the combination of a blast furnace having
a
cinder runner, the improvement which com
eight feet, and a width W, likewise taken at the
top, of approximately seven feet. In the installa 55 prises a settling basin connected at one end there
of to the cinder runner, said settling basin having
tion shown, the basin has a depth of approxi
a width substantially greater than the width of
mately four feet. It will be observed from the
the cinder runner feeding the basin, a second cin
contour lines of Figure 2 that the side walls of
- has a length L at the top thereof of approximately
der delivery runner connected to the opposite end
60 of the settling basin from the first cinder runner,
said second cinder runner being of a Width sub
stantially less than that of the settling basin, the
ing flow of cinder within, and to facilitate clean
?rst and second cinder runners at their points of
ing of the basin. The inlet and outlet runners 30
the basin slope gradually inwardly, and that the
corners are rounded in order to avoid the forma
tion of any sharp corners, thus aiding the swirl
and 34 respectively, in the preferred embodiment,
connection to the settling basin being substantial
ly parallel and having the inner side of one and
have the same width w at their tops, which in 65
the
adjacent inner side of the other spaced from
this case is approximately two feet, four inches.
each other laterally of the basin at least a distance
To cause the incoming mixture of cinder and iron
at least substantially equal to the width of the
to impinge upon a wall of the basin, the adjacent
?rst
cinder runner, so that the areas of flow of
inner walls of the inlet and outlet runners are
offset for an appreciable distance 0. In this 7.0 cinder into and out of the settling basin projected
within the basin are spaced from each other at
modi?cation the offset 0 is made approximately
all points.
three feet, four inches.
3. In the combination of a blast furnace having
It is obvious that the various dimensions given
a cinder runner, the improvement which com
above, such as width and length of the settling
tank, its depth, the width of the runners, and the 75 prises a settling basin of generally rectangular
2,409,741‘
c
horizontal section connected ‘at one end thereof
to the cinder runner, said settling basin- having‘
a width substantially greater than the width of
the cinder runner feeding the‘basin, a secondv
cinder delivery runner connected" to' the opposite
end of the ‘settling basin from. the ?rst cinder
runner, said'second cinder runner being of a
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laterally of the basin at least a distance at least
substantially equal to the width of the ?rst. cinder
runner, so that the. areas of flow of cinder into
and out of the settling basin projected within the
basin are spaced from each other at all‘points.
' 7. In the combination of a blast furnace hav
ing an iron notch, an iron runner associated
width substantially less than that of the settling
therewith, ‘a skimmer trough in the iron runner,
basin, the ?rst and second‘ cinder runners at
and"v a cinderlrunner leading-from the skimmer
16
their points of connection to the settling-basin
trough, the improvement which comprises‘a'set
being substantially parallel and having the inner
tling basin of ‘generally rectangular horizontal
side of one and‘ the ‘adjacent inner side of the ‘
section connected at one end thereof to the cinder
runner, ‘said settling basin having a width sub
stantially greater than the width of ‘the cinder
to the width of the ?rst cinder runner, so that 15 runner feeding the basin, a second cinder delivery
other spaced? from each other laterally of the basin
at least a distance at least substantiallyequal
the areas of flow of- cinder into- and out of the
settling basin projected within the basin are
spaced from each other at all points.
I
4. In the combination of a blast furnace having
runner connected to the opposite end of the set
tling basin from the ?rst cinder runner, said sec
ond‘ cinder runner being‘ of- a width substantially
less than that of the settling basin, the ?rst and
an iron notch, an iron runner associated there 20 second cinder runners at their points of connec
with, a skimmer trough in the iron runner, and a
tion to the settling basin being substantially par
cinder runner leading from the skimmer trough,
allel and having the inner side of one and the
the improvement which comprises a settling basin
adjacent inner side of the other spaced from each
connected at one end thereof to the cinder runner,
other laterally of the basin at least a distance at
said settling basin having a su?icient horizontal 25 least substantially equal to the width of the ?rst
area and volume to allow the molten cinder to flow
therethrough at substantially lower speeds ‘than
through the cinder feeding runner, a second cin
der delivery runner connected to another wall of
the settling basin from the ?rst cinder runner,
said second cinder runner being of a width sub
stantially less than that of the settling basin,
» cinder runner, so that the areas of ?ow of cinder
into and out of the settling basin projected within
the basin are spaced from each other at all points.
8. In the combination of a blast furnace having
a ?rst cinder runner, the improvement which
comprises a settling basin connected at one end
thereof to and fed by the ?rst cinder runner, a
the ?rst and second cinder runners at their points
second, cinder delivery, runner for feeding cinder
of connection to the settling basin having such
out of the basin connected to a different wall of
location and direction relative to each other that 35 the
settling basin from that to which the ?rst cin
the stream of molten cinder ?owing into the basin
der runner is connected, the ?rst and second cin
from the ?rst runner in the main impinges upon
der runners at their points of connection to the
a wall of the basin before ?owing out the second
settling basin having ‘such location and direction
runner.
5. In the combination of a blast furnace having 40 relative to each other, that the paths of ?ow of
molten cinder into and out of the settling basin
an iron notch, an iron runner associated therewith, a skimmer trough in the iron runner, and a
are appreciably out of alignment with each other,
and that the stream of molten cinder ?owing into
cinder runner leading from the skimmer trough,
the basin from the ?rst runner in the main im
the improvement which comprises a settling basin
pinges upon a wall of the'basin, before flowing
connected at one end thereof to the cinder runner, 45 out of the second runner.
said settling basin having a width substantially
9. In the combination of a blast furnace having
greater than the width of the cinder runner
a ?rst cinder runner, the improvement which
‘feeding the basin, a second cinder delivery run
comprises a settling basin connected at one end
ner connected to the opposite end of the settling
thereof to and fed by the ?rst cinder runner, said
basin from the ?rst cinder runner, said second 60 settling
basin having a su?‘icient horizontal area
cinder runner being of a Width substantially less
and
volume
to allow the molten cinder to flow
than that of the settling basin, the ?rst and second
therethrough at substantially lower speeds than
cinder runners at their points of connections to
through the cinder feeding runners, a second,
the settling basin being substantially parallel and
cinder delivery, runner fol‘ feeding cinder out of
offset relative to each other a substantial distance 65
the
basin connected to the settling basin, said
so that the areas of flow of cinder into and out of
‘ second cinder runner being of a width substan
the settling basin projected within the basin are
tially less than that of the settling basin, the ?rst
spaced from each other at all points.
and second cinder runners at their points of con
6. In the combination of a blast furnace having
nection to the settling basin having such location
an iron notch, an iron runner associated there 60
and direction relative to each other, that the
with, a skimmer trough in the iron runner,’ and a
paths of flow of, molten cinder into and out of
the settling basin are appreciably out of align
ment with each other, and that the stream of
connected at one end thereof to the cinder run
ner, said settling basin having a width substan 65 molten cinder ?owing into the basin from the
?rst runner in the main, impinges upon a wall
tially greater than the width of the cinder runner
of the basin before ?owing out of the second
feeding the basin, a second cinder delivery run
runner.
ner connected to the opposite end of the settling
cinder runner leading from the skimmer trough,
the improvement which comprises a settling basin
10. In the combination of a blast furnace hav
basin ‘from the ?rst cinder runner, said second
ing an iron notch, an iron runner associated
cinder runner being of a width substantially less 70
therewith, a skimmer trough in the iron runner
than that of the settling basin, the ?rst and sec
and a ?rst cinder runner leading from the skim
ond cinder runners at their points of connection
mer trough, the improvement which comprises a
to the settling basin being substantially parallel
and having the inner side of one and the adjacent
- settling basin connected at one end thereof to
and fed by the ?rst cinder runner, a second,
inner side of the other spaced from each other 75 cinder delivery, runner for feeding cinder out of
2,409,741
7
the basin connected to a different wall of the set;
tling basin fromthat to which the ?rst cinder
runner is connected, the ?rst and second‘ cinder
runners at their points of connection to the set
tling basin having such location and direction
relative to each other, that the paths of ?ow of
molten cinder into and out of the settling basin
are appreciably out of alignment with each other,
and that the stream of molten cinder flowing into
the basin from the ?rst runner in the main, im
pinges upon a wall of the basin before ?owing out
8
ing a sui?cient horizontal area and volume to
allow the molten cinder to ?ow therethrough at
substantially lower speeds than'through the cin
der feeding runner, a second, cinder delivery,
runner for feeding cinder out of the basin con
nected to the settling basin, said second cinder
runner being of a Width substantially less than
thatof the settling basin, the ?rst and second
cinder runners at their points of connection to
10 the settling basin, having such location and direc
tion relative to each other that the paths of ?ow
of molten cinder into and out ofv the settling basin
the second runner.
are appreciably out of alignment with each other,
11. In the combination of a blast furnace hav
and that the stream of molten cinder ?owing into
ing an iron notch, an iron runner associated
therewith, a skimmer trough in the iron runner 15 the basin from the first runner in the main, im
pinges upon a wall of the basin before ?owing out
and a ?rst cinder runner leading from the skim
the second runner.
mer trough, the improvement which comprises a
HERMAN F. DOBSCHA.
settling basin connected at one end thereof to and
fed by the cinder runner, said settling basin hav
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