Патент USA US2116725код для вставки
May 10, 1933- L. G. J'ENNESS _ 2,116,725 METALLURGI CAL FURNACE Original Filed July 11, 1934 4 Sheets-Sheet l I I" M _ INVENTOR ATTORNEYS May 10, 1938. |_, G, JENNESS ‘ METALLURGICAL 2,116,725 FURNACE _ Original Filed July 11, 1934 ‘ >4 Sheets-Sheet 2 100 K -‘ , M Z”? g2; / .92" 5-‘ f; _' 9F 94 .15 14 | Z7 26 I ‘ v15 Z2 _ i h . 21 ' Z5 INVENTQR - amzv. . WWW/2% ' , May 1'0, 1938.7 I " “ L. e. JENNESS ‘ ' 2,116,725 METALLURGICAL FURNACE Original Filed July 11, 1934 100 95 v/,91 . 4 Sheets-Sheet 3 W5 g2. 62 51. 55 90 , WW 3’ WM 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 _ i " ' 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 3 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.