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Патент USA US2116725

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May 10, 1933-
L. G. J'ENNESS
_
2,116,725
METALLURGI CAL FURNACE
Original Filed July 11, 1934
4 Sheets-Sheet l
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INVENTOR
ATTORNEYS
May 10, 1938.
|_, G, JENNESS
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METALLURGICAL
2,116,725
FURNACE
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Original Filed July 11, 1934
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METALLURGICAL FURNACE
Original Filed July 11, 1934
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TI'ORNEYS
May 10, 1938. '
L. a. JENNESS
METALLURGICAL FURNACE
OriginalFiled July 11, _l934
2,116,725
4 Sheets-Sheet 4
Patented May 10, 1938
" 2,116,725
UNITED STATES PATENT’ OFFICE
2,116,725
_
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' METALLURGICAL FURNACE
Leslie G. Jenness, Newark, N.- .L, assignor to In
termetal Corporation, New York, N. Y., ascor
poration of Delaware
Application July 11, 1934, Serial No. 134,566‘
Renewed October 13, 1937
10 Claims.
The present invention relates to improvements
in metallurgical furnaces of the multiple-hearth
' type and has for a general object the provision of
such a furnace which is readily constructed,
5 sturdy, and adapted for eiilcient use in a variety
of processes for separating metals from ores-and
oxides.
More speci?c objects are the provisions of such
a furnace featured by a furnace chamber having
10 a rabble assembly which is suspended‘lfrom a gas
tight bearing in the top of the furnace chamber.
provided with rabble arms and rake blades of a
simple and sturdy design allowing ready assembly
from interchangeable parts in combination with
15 a gas-tight receiver at the bottom for receiving
discharged material and a vapor condenser con
’nected to the top of the furnace chamber; a gas
tight receiver for collecting reduced materialhav
ing an agitator for intermingling it ' with oil,
0 which is of a simple and novel design and efficient
'
in operation; a vapor condenser constructionaliy
adapted for e?icient use; an e?icient charging de
(Cl. 263-26)
,_
Fig. 8 is an enlarged plan view with parts in
section and parts broken away of a rabble arm
and rakes assembled thereon;
Fig. 9 is a side view of the rabble arm and
rakes assemblage shown in Fig. 8;
Fig. 10 is a plan view of the charging device
and associated hopper;
Fig. 11 is an enlarged vertical section taken on
line Il—ll of Fig. 10 and showing‘ the device
mounted in a portion of the wall of the furnace 10
chamber; and
‘
,
i Fig. 12 is a vertical section taken on line Ill-I2
of Fig. 11 with the furnace wall portion omitted.
The metallurgical furnaceof the present in
vention is intended primarily for processing ores 15'
of metals and oxides of metals in powdered form
by treatment with gases at elevated tempera
tures. Two particular processes for which it is
applicable are (1) the reduction of metal oxides
by hydrogen; and (2) the separation of metals 20'
from ores by chloridizing the metal with sulphur
dichloride and chlorine, vaporizing the metal
and collecting it by condensation.
vice of simple and novel construction; and other . chloride
The furnace proper consists of a vertical cyl
features of construction which collectively con
” tribute to simplicity and e?iciency of operation of inder containing a series of horizontal soles,
alternate soles being apertured at the center and
the furnace.
.
'
at
the periphery for passage of material with'the
Other objects of the invention will in part be
peripherally apertured soles provided with central
obvious and will in part appear hereinafter.
apertures to receive a shaft. The soles are sup
The invention accordingly comprises the fea
' 30 tures of construction, combination of elements ported on brackets on the inside walls of the cyl
inder with connections which prevent rotation
and arrangement of parts, which will be exempli
fled in the construction hereinafter set forth and of the soles but permit relative movement with
the scope of the invention will be indicated in the the cylinder wallsso as to obviate buckling due to
expansion ,at high‘ ‘temperature. A rotating
claims.
For a fuller understanding of the ‘nature ahd shaft is suspended centrally from the upper end
objects of the invention reference should be had of the furnace and guided by a bearing near the
lower end. This shaft carries radial rabble arms,
to the following detailed description taken in con
nection with the accompanying drawings, in one set of rabble arms above each sole. The rab
q
which:
Fig. 1-is a top plan view of the metallurgical
40
furnace of the present invention, with parts
broken away;
>
'
_~
‘
Fig. 2 is a vertical section taken online 2-4 of
'
Fig. 1;
45
‘
-
'
Fig. 3 is an enlarged horizontal section taken
on line 3-3 of Fig. 2;
-
Fig. 4 is an enlarged horizontal section taken
on line 4-4 of Fig. 2;
'
Fig. 5 is a vertical section with‘
parts broken
50 away taken on line 5.-—5 of Fig. 1;
Fig. 6 is an enlarged vertical sectional view of
, the gas-tight shaft supporting bearing mounted
in the top of the-furnace proper;
-
Fig. '7 is an enlarged vertical sectional view of
i‘ the guiding bearing for the rabble shaft;
ble arms carry rabble rake blades obliquely dis
posed which just clear the soles. The disposition 40
of the rabble rake blades on the rabble arms is
such that the set of blades immediately above
the centrally apertured sole will gradually work a
charge of powdered material from the outside of
the sole to the central aperture, and the set of
rake blades immediately " above a peripherally
apertured sole will gradually work a charge of ;
powdered material from the center. to the
periphery-
,
»
Y
>
'
The soles thus act as battles and the rabble rake
blades move the powdered charge from the out
side of one sole to its central aperture where it
drops down on to the succeeding sole below and is
moved by the next set of rake blades to the
periphery of the last mentioned sole where it
.
2
2,116,725
drops down on to the sole below.
Thus. the
rapidity with which the charge of powdered ma
terial is moved from the top to the bottom of the
ing oil as needed and with means for removing
the sludge of oil and metal powder when de
sired.
.
/
furnace can be regulated by the speed at which
5 the vertical shaft is rotated and by the angle, or
angles, at which the rake blades are disposed with
To take care .of the waste material issuing at
the top of the furnace chamber a vapor con
respect to the rabble arms and by the clearance
between the rake blades and the soles.
cylindrical, is provided into which the water
vapor and any unused hydrogen is received.
The powdered material is charged into the fur
10 nace near the top of the cylinder wall, just above
the uppermost sole. Charging is accomplished
through a worm tube led into the side of the cyl
/ inder on a downward slope. The powdered mate
rial is supplied to the worm tube from a hopper,
15 the top of which can be closed gas-tight if de
sired. However,- it has been found that usually
the body of powdered material in the tube and
, hopper will serve as an e?icient gas-tight seal.
To overcome any caking at the bottom of the hop
20 per, a pair of shafts are provided with staggered
pins and therotation of these shafts in oppo
site directions and passing of the pins insure the
feeding of loose material to the worm. The rate
of charging the powdered material into the fur
25 nace is governed by the rate at which the worm
is driven.
,
To insure tightness at the bearing of the verti
cal shaft a ball and socket suspension is provided.
The weight of the shaft and its rabble arms and
30 rake blades insures a good seat of the ball in its
socket and prevents the escape of any gas at
this point. The lower bearing does not carry
any weight but merely guides the lower end of
the vertical shaft.
35
.
Electrical resistance heating elements are pro
vided around the cylindrical wall of the furnace
and so arranged that heat may be applied or cut
off at all levels, or at any desired level. Outside
the heating elements, suitable heat insulation is
40 provided. Pyrometer tubes inserted in the ver
tical wall enable the inside temperature of the
furnace to be determined at any desired level.
Means are provided for admitting gas, or gases,
or gas generating liquids at or near the bottom
45 of the furnace chamber.
denser consisting of another chamber, preferably
Cooling coils located in the ends of this cylinder
condense the water vapor which is allowed to run 10
off by gravity through suitable water seals or
traps. The condensation of the water ‘vapor. in
this cylinder tends to facilitate the rise of the
gases through the furnace by the creation of a
greater or less degree of vacuum. Condensed 15
water is prevented from getting back into the
furnace by a baiiie or suitable elevation around
the opening from the furnace into the cylinder.
An outlet is also provided for excess hydro
gen which can be piped out-doors or to some
place where it will not create a dangerous condi
tion, or can e.
iri?ed and recycled.
When the furnace is used for separating metals
from ores by a chloridizing and vaporizing process
the desired metal compounds pass out at the top 26
-of the furnace chamber in the form of vaporized
metal chlorides and the waste material from the
ore passes out at the bottom of the furnace cham
ber in the form of a powder. For such use, the
furnace is provided with any suitable gas-tight 30
receiver to receive the powder ‘discharged at the
bottom, connected by a. gas-tight joint with ‘the
bottom opening. Sulphur dichloride vwhich is a
liquid is introduced through the side wall of the
furnace near the bottom and is vaporized-by the 35
heat in the furnace. The introduction may be
made at one or more levels as demanded by the
process being carried on in the furnace. Chlorine,
which is a gas at "ordinary temperature, is also
introduced through the side wall of the furnace 40
preferably with the sulphur dichloride.
The vaporized metal chlorides which result
from the reaction pass out at the top of the fur
nace chamber and are condensed in a vapor con
A gas-tight vapor‘ con
denser is connected to the top of the furnace
by lowering the temperatures.
chamber for receiving gaseous or vaporous- ma
may be carried out in this furnace as selective
terial discharged from the furnace chamber and
a gas-tight receiver is provided for hot pow~
50 dered material discharged at the bottom of the
furnace chamber.
The particular construction
of the gas-tight vapor condenser and the re
ceiver for powdered material depends upon the
particular use to which the furnace is to be put.
55
When the furnace is used to reduce a metallic
oxide by hydrogen the valuable product is the
reduced metal which is discharged at the bot-.
tom of the furnace chamber and the waste prod
uct is water vapor which passes out at the top!
to To collect the powdered metal, a receiver, con
sisting of a mixing chamber, preferably a hori
zontal cylinder, and an agitator, is secured to the
under side of the furnace chamber with a gas
tight joint and the cylinder is partly ?lled with
65 oil into-which the metal powder falls and by
which it is cooled. The agitator, preferably a
central horizontal shaft with a discontinuous
worm, keeps the metal powder and oil in motion
toward one end of the cylinder. As the oil will
70 flow back more easily than the metal powder a
sludge is produced at one end of the cylinder
'-..with relatively clean oil at the other end and in
the middle, to receive new additions of metal
powder. Tne'eylinderxis provided with means for
to admitting hydrogen eaEjw-itlrigans for supply
denser consisting of suitable gas-tight receivers 45
Such a process’
separations by control of the furnace temperature
so as to chloridize and vaporize one metal from
the ore at a time, or they may be carried out at
a temperature sufiiciently high‘to chloridize and
vaporize two or more metals in the ore and the
resultant metal chlorides separated by fractional
‘condensation.
Referring to the drawings for a more detailed
description of the invention like numerals refer to
like parts throughout:
A vertically disposed furnace chamber con
sisting of a cylinder I3 is provided with a ?ange
It at the top to which is bolted a top plate IS, 60
a flange l6 at the bottom to which is bolted a
bottom plate I‘! provided with a discharge pas
sage “! having a ?ange I9 to which is bolted in
a gas-tight manner the inlet opening of a gas
tight receiver which may be a mixing chamber
20, hereinafter more fully described, or a gas
tight receptacle as required by the use ‘to which
the metallurgical furnace is put. Around the
walls of the furnace are disposed series of elec
trical heating elements 2 I-2I overlaid by a layer 70
of insulating material 22 and through the walls
of the furnace at various levels are positioned
pyrometer tubes 23-23 whereby the heat in any
a particular zone in the furnace may be deter
mined. The heating elements 2l-2| are adept 75
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2,116,725
ed to be operated in a variety of combinations so
that the heating in all zones may be controlled.
Within the furnace chamber l3 are located a
structure adjacent the walls of the furnace cham
ber.
'
'
- Opposite each of the soles 25-25 in-the wall
of the furnace chamber is preferably provided an
series of horizontal soles 24-24 and 25-25 alter
nately arranged, the soles 24-24 being aper-» inspection hole. not shown, suitably closed ‘by a»
tured at the center and thesoles 25-25 being gas-tight cover to allow ready inspection and
apertured at the periphery thereof for passage adjustment of the rabble rake assemblages above
>
of material with the soles 25-25 additionally the soles 24 and 25.
The soles 24-24 are made of a diameter slight
apertured at the center for receiving a shaft, as
is more particularly shown in Figs. 3 and 4. A
ly smaller than the inside diameter of the fur-.
baffle plate 26 is mounted above the upper sole 24
nace chamber and supported upon suitable sup
and is of similar construction.
,
A verticle shaft 21 is suspended centrally from
the'top of the furnace by a gas-tight bearing
15 assembly 28 and guided in a bearing 29 in the
lower sole 25. Upon the vertical shaft 21 are
mounted a series of collars 30-30, each,..collar
being located above one of the soles 24-24 and
25-25 and consisting of at least two sections 3|,
20 3| bolted together whereby the collar may be
, clamped upon the shaft 21 in any desired posi
tion.
.
‘
ports 44-44 to permit relative movement with
the chamber walls so as to obviate buckling due
to expansion at high temperatures, while pre
venting rotation of the soles. Similar provisions
are made for mounting the soles‘25—25..
The powdered ore material is charged into the
furnace near the top of the furnace chamber
just above the top sole 24 and below the baiile
plate 26 by va charging device 45 consisting of a 20
worm tube 46 having an end 41 arranged to
project through the wall I3 and provided with a
mountingv?ange 48. The worm tube 46 is in
clined downwardly as shown to facilitate travel
of the powdered ore material. In the upper end 25
25 as shown in Fig. 8. A sleeve 33 is mounted upon
of the worm tube 46 is seated a bearing structure
the rabble arm 32 and has a face of one end
abutting a shoulder 34 on the section 3|. The ‘ 49 having a sealing ring 50 threaded therein. A
face of the other end of the sleeve 33 is disposed feeding worm 5| is positioned within the worm
at an oblique angle to the axis of the rabble arm tube 46 and a shaft.52 for the feeding worm
projects through the sealing ring 50 and hear 30
30 32, preferably at an angle of 45°. A rabble
ing structure 49 and has a bevel gear 53 keyed
plate or rake blade 35 is provided with an aper
ture the axis of which is disposed at an oblique to the end thereof. A bracket 54 rotatably sup
A rabble arm 32 is mounted upon each section
3|, preferably being threaded into a tapped hole
angle to the axis of the rabble’ arm 32 preferably - ports a bevel gear 55 meshed with the bevel gear >
at an angle of 45° and is mounted upon the rab
ble arm 32 to abut against the face of the end
of the sleeve 33. A similar rabble plate or rake
53 and a spur gear 56 keyed with the bevel
gear 55.
A casting 51 having a passage‘ 58 is mounted
vertically upon the worm tube 46 with the passage
58 aligned with an aperture in the worm tube
blade 36 is mounted in a similar manner upon
the rabble arm 32 and spaced from the rake blade
35 by a spacing sleeve 31 having the faces of . 46 as shown. A hopper 59 is mounted upon the
the ends thereof disposed at angles to abut casting‘51 and, if desired, may be provided with
against the adjacent faces of the rake blades 35
a cover to insure gas-tightness.
,
and 36. An additional rabble plate or rake blade
38 is mounted upon the rabble, arm 32 in a
similar manner; The rake blade 38 is similar
in all respects to the rake‘ blades 35 and 36 ex?
cept that it is of greater width to provide a lead
ing edge as depicted in Fig. 8. A spacing sleeve
39, similar to the spacing sleeve 31, is mounted
between the rake blades 36 and 38. To secure
the assemblage in position upon the rabble arm
32 an additional sleeve 40 is provided having the
face of one end engaging the adjacentlface of,
the rake blade 38 and the other end engaged by
a head M of ‘a bolt 42 threaded into‘ a tapped
hole in the outer end of the rabble arm 32.
A pair of shafts 6|], 6|) are horizontally disposed
side by side within the passage 58 with the inner
‘in Figs. 3 and 4 and illustrated in Fig. 8 in full
and dot-dash lines, whereby ore material may
be worked across the soles either toward the cen
tube 46.
ends seated in supporting recesses and the outer
ends reduced and rotatably mounted in bearing 45
structures 6|, 6| supported, by the casting 51.
Meshed pinions 62, 62 are keyed to the ends of
the shafts 60, 66. A plurality of pins 63-63 are
mounted on each-of the shafts 66, 60 of a length
sufficient just to clear the adjacent shaft and 60
arranged on both shafts 66, 66 in alternate fash
ion so that they will pass each other in rotation of
the shafts 66,60. The pinions 62,62 being in mesh
will rotate the shafts 60, .60 in opposite direc
tions so that when operated with the pins 63-63 55
moving downwardly between .the shafts 60, 66
Such structure allows ready assembling of‘ the ‘
‘the powdered ore material in the-bottom of the
rabble plates or rake blades on the rabble arms
hopper. will be agitated andfed into the worm'
32 and any desired arrangement, as illustrated
‘ ters thereof or toward the peripheries thereof at
any desired speed. If‘desired, a spacing sleeve 43
having the faces of the ends thereof disposed at
65 right angles to each other and at substantially
45° to the axis of the rabble arm 32 may be sub
stituted. for the spacing sleeve 39 between rake
blades 36 and 38 'on one of the rabble arms 32-32
70 ‘in the rabble assemblages above soles 25-25
whereby the rake blade 36 in each assemblage
may operate in a more efficient manner in direct
ing the ore material through the peripheral aper
tures in the sole 25 and insuring removal of
75 powdered material from the‘ sole supporting
,
A rotatable shaft 64 is mounted on one side of 60
the casting 51 and is provided with a spur gear 65
keyed thereto in mesh with spur gear 56 and a
spur gear'66 keyed thereto’ in meshwith one of
the pinions 62, 62. Any suitable means are pro
vided for rotating the shaft 64 so that the feed (i5
ing worm 5| and the agitating shafts 66, 66 may
be simultaneously operated.
‘The rabble shaft 21, as has been previously
indicated, is supported from the top of the fur
nace chamber by a gas-tight bearing structure 70
28. This bearing structure consists of a collar 61
mounted upon the top plate l5, preferably welded
thereto. A centrally disposed hole in the.collar
61 is aligned‘with a hole in the plate i5 and in
ternally threaded at 68 as shown in Fig. 6. The
4
2,116,725
collar 61 is also provided with a recess 99 in which
is seated a gasket 10 of suitable material. A
socket member ‘II is mounted upon the collar
der 92 to carry off excess hydrogen. Each of the
conduits I00, I00 is also provided with a pot heat
61 provided with a threaded neck ‘I2 threaded
into thev threaded aligned holes in the collar 6?
“In ‘operation powdered ore material is placed
within the hopper 59 which, if desired, may be
‘and the plate 85 with the gasket 60 acting as an
supplied with a gas-tight cover. However, the
mass of powdered material in the hopper acts as _
e?icient seal between the collar Bi and a portion
of the socket ‘II. A collar ‘89 is mounted, prefer
ably threaded, upon the rabble .shaft 21. The
IM to act as a water seal.
an e?icient gas-tight seal. The shaft 60 is ro
tated so that the pins 63--63 on the shafts 60, 60
collar ‘I3 is provided with a lower crowned ,sup~. will agitate the powdered ore material to prevent 10
porting bearing surface 19, preferably spherical,
and the socket member ‘ii is provided with a
mating bearing surface as shown. The entire
rabble assemblage is thus supported from the top
of the furnace chamber by the bearing structure
20 and the weight .of the rabble assemblage
causes the bearing to seat within the socket in a
gas-tight manner. However, in order to augment ,
the-gas-tightness of the bearing the collar 13 is
provided with a threaded neck ‘I5 engaged by an
internally threaded ring ‘it recessed at W to con
?ne a gasket ‘I8 between the wall of the socket
I and the ring ‘it.
‘
When the metallurgical furnace is used for the
25 reduction of metal oxides by hydrogen a gas-tight
receiver comprising the mixing chamber 20 is
bolted to ?ange It in a gas-tight manner/with
the passage 98 aligned with an inlet passage 19
in ‘the top of a horizontally disposed cylinder 80
30 and adjacent one end thereof. The horizontally
disposed cylinder 90 is provided at one end with
a closure plate 8! having on the inner face there
of a supporting bearing 82 and at the other end
P with'a closure plate 93 having a bearing structure
35 89 mounted therein. A rotatable shaft 05 is
mounted in the bearings 92 and 89 with one end
thereof projecting through the bearing structure
89 for application of motive power. Upon the
shaft 95 are mounted a series of angularly dis
posed blades 80—96 to form a discontinuous
worm. At the inlet end of the chamber 90 is
provided a hydrogen inlet 81, and at the other
end of the ‘chamber 90, hereinafter called the
discharge end, is provided a suitable discharge
conduit 08 and an oil inlet 99, the oil inlet prefer
ably being located in the top of the cylinder 80, as
shown, for gravity flow of oil. The blades. 86 are
' rotated by the shaft 85 in a direction so that re-'
duced ore material discharged from the furnace
chamber into the mixing chamber will be worked
toward the discharge conduit 00. The discharge
conduit 80 may be connected by a suitable con
duit 90 to a pump or other means to draw off a
sludge of oil and reduced ore material when de=
sired.
'
I
In reducing metal oxides with hydrogen, means
are provided for carrying away and condensing
the water vapor formed by combining the hydro
60 gen with oxygen from the ore, and for carrying
away excess hydrogen. - A vapor condenser 9! is
provided for this purpose consisting of a horizon
.tally disposed cylinder 92 closed at the ends
thereof by plates 93, 93 and connected by a pas
sage 94 with an opening in the plate ii at the
top of the furnace chamber. Around the passage
__ 94 is provided a suitable baille 95 to prevent back—
?ow into the furnace chamber of condensed water
vapor. Suitable cooling coils 96, 96 are provided
70 in the ends of the condenser. Water is carried
off from the condenser by suitable conduits 91, 91
provided with pot heads 90, 90 each of which con
sists of a container into which the conduit 91
projects below an dutlet 99. Conduits I00, I00 are
75 also provided in the top of the condenser cylin
caking and to insure positive feeding of the ore
material to the feeding worm 5i which is like
wise operated by rotation of the shaft 09. Pow
dered ore material drops down upon the upper
sole 29. The bailie plate 26 being disposed there
above prevents dust and the like from being car
ried o? with the gaseous or vaporous material dis
charged from the top of the furnace chamber.
The rabble shaft 21 is rotated to the right so that
vthe rake blades above the upper sole 24 will 20’
work the ore material toward the aperture in the
center thereof. The ore material then drops
down upon the soIé‘IS’therebelow and is worked
by the rake blades toward the apertures in the
periphery thereof. The rapidity with which the 25
charge of powdered material is moved from the
top to the bottom of the furnace chamber is reg
ulated by the ‘speed with which the rabble shaft
is rotated, by the angle, or angles, at which the
rake blades are disposed with respect to the rab-.
ble arm, and by the clearance between the rake
blades and the soles.
When the metallurgical furnace is used to re
duce'metal oxides by hydrogen, the hydrogen is
introduced through the inlet 81 in the mixing 35
chamber 20 and rises ‘through the outlet I8 in the
furnace chamber up past the charge of powdered
material as the latter is gradually worked down
through the furnace chamber. The waste mate
rial consists of water vapor and excess hydrogen 40
which will discharge from the top of the furnace
chamber into the vapor condenser 9| where the
water vapor is condensed and discharged through
the conduits 91, 91 and the excess hydrogen is
discharged through‘the conduits I00, I00 to be
carried away ‘as waste material or to be purified
and recycled. Oil is introduced into the mixing
chamber 20 through the- inlet 89 and reduced
ore material is discharged from the furnace
chamber through the passage l0 into the mixing
chamber 20. The shaft 85 is rotated to the right 50
so that the powdered ore material and oil will be
thoroughly mixed together to form a sludge which
is gradually worked toward the discharge conduit
90 through which it may be removed as desired
by any vsuitable means such as a pump.
when the metallurgical furnace is used for the
separation of metals from ores by chloridizing .
the metal with sulphur dichloride and chlorine,
waste material in powdered form is discharged 60
through the passage l8 into a gas-tight receiver
of any suitable construction connected by a gas
tight joint to the ?ange l9 and the desired metal
compounds pass out at the top of the furnace
chamber in the form of vaporized metal chlorides 65
into ‘a vapor condenser. Selective separations
may be carried out by control of the furnace tem
perature so as to chlcridize and vaporize one metal
from the ore at a time and condensation of the
vapor in a gas-tight container by lowering the 70
temperature, or by cpntrol of the furnace temper—
ature sumciently high to chlcridize and vaporize
two or more metals in the ore and fractional
condensation in successive gas-tight. containers
by lowering the temperature to a predetermined
5
2,116,725
degree in each of-rthe containers. Sulphur di
lar being formed from sections, means to se
chloride, which is a liquid at ordinarytempera
tures, and chlorine which is a gas, ‘are’ introduced
lar in any desired position on said shaft, a rab
preferably together through the side wall of the
ble arm mounted on each of said sections, a ‘
furnace near the bottom of the furnace chamber‘
at one or more levels as demanded by the process
beingcarrled out.
cure said sections together and clamp said col
plurality of flat plate rake blades each having
a hole therethrough ‘the axis of which is disposed
at an oblique angle to the axis of said rabble arm
It will thus be seen that the present invention
with said rabble arm received therein, spacing
attains in an efficient manner the objects set
sleeves, mounted on said rabble arm between said
departing fromthe scope'thereof, it is intended
formed at an angle to abut the surfaces of said
rake blades, and a bolt threaded into the end of
said rabble‘arm having a head engaging the out 15
ermost end of the outermost sleeve whereby said
rake blades and sleeves are secured on‘said‘ rab
collar and the innermost rake blade, between said
10 forth above. Since certain changes- may be made _ ‘ rake blades and beyond the outermost rake blade, 10
in the above construction and different‘ 'emb‘bdi
- ments of the invention could be made without said spacing sleeves having the ends thereof
that all matter contained in the above description
15 or shown in the accompanying drawings shall be
interpreted as illustrative andnotrvin a limiting
sense.
‘
'
‘Having described my invention, what I claim
» as new and desire to secure by Letters Patent is: -
ble armQ
.
‘
7. In a metallurgical furnace the combination
with a furnace chamber having at least one hori 20
zontally disposed sole, of ‘a vertical rabble shaft
having an enlarged portion provided with a
1. In a metallurgical furnace the combination
with a gas-tight furnace chamber, of a rabble a's
semblage including a vertical rabble shaft having
an enlarged ‘portion provided with a crowned
crowned . supporting‘*‘bearing surface, a socket
supporting bearing surface, a socket in the'top
25 of said chamber to receive said enlarged portion
and having a mating bearing surface, andmeans
portion and having a mating bearing surface,
means sealing said enlarged portion in said sock
2.0
in the top of said chamber to receive said enlarged
‘ sealing said enlarged portion in said socket in a , et in a gas-tight manner, a collar mounted on said
gas-tight manner.
‘
‘
2. In a metallurgical furnace the combination
with a gas-tight furnace chamber, of a rabble as
semblage' including a vertical rabble shaft, ‘a col
lar on said shaft having a lower spherical bearing
surface, a socket in the top of said chamber to
receive said collar and having a mating bearing
surface, and sealing means between said collar
and said socket.
,
_
3. In a metallurgical furnace the combination
with a gas-tight furnace chamber, of a rabble
assemblage including a vertical rabble shaft, a
collar threaded on said shaft, said collar having
shaft, said collar being formed from sections,
means to secure said sections together and clamp
said collar in any desired position on said shaft 30'
above the sole, a rabble arm mounted on each of
said sections, a plurality of ?at plate rake blades ,
each having a hole therethrough the axis of which
is disposed at an oblique angle to the axis of said
rabble arm with said rabble arm received therein,
spacing sleeves mounted on said rabble arm be
tween said collar and the innermost rake blade,
between said rake blades, and beyond the outer
most rake blade, said spacing sleeves having the
end thereof formed at an angle to abut the sur
40
faces of said rake blades, and a bolt threaded into
the end of said‘ rabble arm having a head engag
portion, a socket sealed into the top ,of said' cham
ber, said socket having a central aperture to re- ' ing the outermost end of the outermost sleeve
ceive said shaft and a matingbearing surface, a whereby said rake blades .and sleeves are secured
'
45
gasket between said threaded portion and the wall on said rabble arm.
8. Ina metallurgical furnace the combination
of said socket, and a ring threaded on said thread
a lower crowned bearing surface and a threaded
ed portion to expand said gasket _for\a gas-tight
seal.
a
‘
with a furnace chamber provided with a series of
horizontally disposed soles'alternately apertured
~
‘4. In a metallurgical furnace a rabble arm‘ ‘ near the center and near the periphery, of a rab
ble assemblage comprising a vertical rabble shaft
50 mounted on a vertical rabble, a plurality of ?at
plate rake blades each having ' a hole there
, through the ams of which is disposed at an oblique
angle to the axis of said rabble arm with said
rabble arm received therein, spacing sleeves
mounted on said rabble arm betweensaid rake
blades and having surfaces at'the ends thereof
abutting the surfaces of said rake blades, and
7 means securing said sleeves and said rakeblades
on said rabble arm.
60 '5. In a metallurgical furnace a rabble arm
mounted on a vertical rabble, a plurality of flat
plate rakes blades each having a hole there
through the axis of which is disposed at an oblique
angle to the axis of said rabble arm with said
65 rabble arm received therein, spacing sleeves
mounted on said rabble arm between said ‘rake
blades and having the ends thereof formed at an
angle to abut the surfaces of said'rake blades, a’
similar sleeve beyond the outermost rake blade,
having an enlarged; portion provided; with a
crowned supporting bearing surface, a socket in
the top of said chamber to receive said enlarged
portion and having a mating bearing surface,
means sealing, said enlarged‘ portion in said sock-. 65
et in a gas-tight manner, a plurality of collars
mounted on‘ said shaft between the soles, each of
said collars being formed from sections, means to
secure said sections together and clamp each of
' said collars in any desired position‘on said shaft
above the associated sole, a rabble arm mounted
on each of said sections, a plurality of ?at plate
rake blades each having a hole therethrough the
axis of which is disposed at an oblique angle to‘
the axis of said rabble arm received therein, spac
ing sleeves mounted on said rabble arm between
said associated collar and the’ innermost rake
blade on said arm, between said rake blades, and
beyond the outermost rake blade on said arm,
said spacing sleeves having the "ends thereof 70
70 and a bolt threaded into the end of said rabble
arm having a head engaging the ‘outermost end formed at an angle to abut the surfaces of said
, of said last mentioned sleeve whereby said rake , rake blades, a bolt threaded into‘ the end of’ said
blades and sleeves are secured on said rabble arm. rabble arm having a head engaging the outer
6. In a metallurgical furnace a vertical rabble ‘most end of the outermost sleeve whereby said
shaft, a collar mou’nted on said shaft, said col- ‘ rake blades and sleeves are secured on said .asso’;
75
6
_
2,116,725
ciated rabble arms with the rake blades disposed >
10. In a metallurgical furnace a charging de
at angles to work ores across said soles toward the vice comprising a. worm. tube inclined downward
apertures therein, and a guiding bearing for said
ly to supply powdered ore material to the furnace
rabble shaft in the lower portion of said cham- ‘ chamber, a. worm in said tube, a worm shaft pro
ber.
'
9. In a metallurgical furnace a charging device
located in the wall of a furnace chamber adjacent
the top thereof comprising a worm tube inclined
downwardly and opening into said furnace cham
ber, a worm in said tube, a worm shaft projecting
jected through a gas-tight ?tting in the end of
said tube and supported by bearings therein, a
substantially vertically disposed passage opening
into said tube above said worm, a hopper mount
ed on the upper end of said passage,a pair of ro- _
tatable horizontally‘ disposed shafts located sidev 10
from said tube through a gas-‘tight bearing, a sub
by side in said passage, pins on said shafts alter
stantially vertically disposed passage opening into , nately positioned so that those on one shaft will
said tube above said worm, a hopper communi
pass those on the other shaft, meshed gears on
cating with said passage, a pair of rotatable hori
shafts whereby said shafts may be operated
'15 zontally disposed shafts located in said passage, said
in opposite directions, and common - driving
pins on said shafts alternately positioned so that means geared to said worm shaft'and to said in 15
those on one shaft will pass those on thesother terengaging gears whereby all of said shafts may
shaft, means to rotate said shafts in opposite di
be operated simultaneously with the pins of one
rections with the pins of one shaft passing down
horizontally disposed shaft passing downwardly
20 wa_rdly.on the side adjacent the compliment shaft, on the side adjacent the compliment shaft.
20
and means simultaneously to operate said worm
shaft and said rotating means.
LESLIE G. JENNESS.
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