US745765A

US745765A - Ore-roasting furnace.

Info

Publication number: US745765A
Application number: US12158502A
Authority: US
Inventors: Aron M Beam
Original assignee: NAT AUTOMATIC FURNACE MILLS AND MINING Co
Current assignee: NATIONAL AUTOMATIC FURNACE MILLS AND MINING Co; NAT AUTOMATIC FURNACE MILLS AND MINING Co
Priority date: 1902-08-30
Filing date: 1902-08-30
Publication date: 1903-12-01
Anticipated expiration: 1920-12-01

Description

PATENTED DEC. 1. 1903.

A. M. BEAM.

ORE ROASTING FURNACE.

APPLICATION FILED AUG. 30, 1902.

I {I l I N0 MODEL.

1: )yoRPls PETERS No. 745,765. PATENTED DEC. 1, 1903,

A. M. BEAM.

ORE ROASTING FURNACE;

ABPLIOATION FILED AUG. 30, 1902.

1N0 MODEL. 7 SHEETSSHEBT 2 EZAI 2/ W" use-5':

aid 54% We 111s mum; PETERS :94, wAsnmanm, n c

PATENTED DEC. 1, 1908.

A. M. BEAM ORE ROASTING FURNACE.

APPLICATIONI'ILED AUG. 30,.1902

7 SHB BTfb-SHEET 3.

NO MODEL.

rm: NoRms PETERS 50., wnsnmcrarv, a c.

No. 745,765. 4 PATBNTED DEC. 1, 1903. A. M; BEAM.

ORE. ROA$TING FURNACE.

APPLICATION FILED AUG. 30, 1902;

no MODEL. I 7 SHEETS-SHEET 4.

325 V n k v in i. '1; .f 39 I 40 M i 1/9 I 29 THE NORRIS PETERS cu., WASHINGTCN, a. c.

PATENTED DEC. 1, 1903.

A. M. BEAM.

EB ROASTING FURNACE.

APPLICATION FILED AUG. 30, 1902.

7 SHEETS+SHEET 5.

N0 MODEL.

THE cums F'EYERS cow wnsnmcwn, u. c

PATENTED DEC. 1, 1903 A. M. BEAM. ORE ROASTING FURNACE.

APP LIO ATION IILED AUG. 30, 1902.

7 SHEETSSHEET 6.

N0 MODEL.

Y MGfZiOT'J THE NORRIS PETERS 50.. WASHINGTON n. c.

PATENTED DEC. 1, 1903. A. M. BEAM.

ORE ROASTING PU APPLIGA'TIOIPILED AUG. 30, 1902.

RNAGE.

'7 SHEETSSHEET 7.

NO MODEL.

UNITED STATES Patented December 1, 1903i PATENT OFFICE.

'ABON M; BEAM, OF DENVER, COLORADO, ASSIGNOR TO THE NATIONAL AUTOMATIC FURNACE MILLS AND MlNlNG COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

ORE-ROASTlNG FURNACE.

cEEGIFICATION forming part of Letters Patent No. 7 i5,765, dated December 1, 1901i.

4 Application filed August'30, 1902. Serial No. 121,585. (No model.)

To all 207mm it may concern.

Be it known that l, ARON M. BEAM, a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Ore- Roasting Furnaces; and I do declare the following to be afull,cle ar,and exact description of-the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being'had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification. 7

My invention relates to improvements in ore-treating furnaces; and the objects of my invention are, first, to provide a revoluble cylindrical muflied furnace; second, to pro. vide an ore-treating muiiiedfurnace that will give to rebellious ores a roast that will con-- an enlarged sectional view of the discharge end of the furnace. Fig. 3 in an enlarged sectional view of the feed end 05 the furnace. Fig. i is an end elevation of \he discharge end of the't'urnace.

tion' of the feed end of the furnace. Fig. 6

. is a plan view of the feed end of the furnace.

Fig. 7 is a plan view of the discharge end of the furnace. Fig. 8 is a cross-section of the furnace on line A. of Fig. 1. 9 is a longitudinal section view of one of the central sections of the furnace, showing the central portion of the section in elevation. Fig. 10 is a longitudinal sectional view of the feed end section of the furnace, showing its central screwblade in elevation. Fig. 11 is an end elevation of the discharge end of the furnace, showing a dust-chamber attachment connected to Fig. 5is ah end eleva-- the fume-chimney of the furnace. Fig. 12 is a section of the cylinder, showing the mannor of attaching the tread-ring on which the flue-cylinder rolls to it. Fig. 13 is a section of the cylinder, showing the preferred arrangement of the driving-gear. Fig. 14 is a perspective View ofone-half of thetread-ring on which the flue-cylinder rests. Fig. 15 is a fragmentary sectional view of a casing I surround the cylinder with, showing the manner of securing the sections of the casing together. Fig. 16 is a plan view of Fig. 15.

Fig. 17 is an end elevation of a section, showing a closed cylinder or axial core at the center of the inudied'cylinder. Fig. 18 isa fragmentary sectional viewof a section of the outer cylinder of the furnace, showiugthe lugs which hold the inner cylinder in place in the flue-cylinder. Fig. 19 is a sectional view of my furnace, showing aside elevation of my adj ustalole roller-s11 pports and their foundation bed-plate. Fig. 20 is a fragment of my cylinder, showing an end elevation of the adjustable" 'roller-supportsaud their end plate. Fig. 21 designates a side elevation of my furnace, partially in section and partially in elevation, showing a furnace provided with an auxiliary combustion-chamber and also with a combined ore-drier arranged in the top of the casing and also with nitrate chambers or tanks and with apparatus for exhausting the sulfuruus gases and for converting the sulfurous gases into sulfuric acid. Fig. 22 is a cross-section of Fig. 21 on line B. Fig. 23 is a fragmentary section through the combined ore drier and conveyor on line C of Fig. 21. Fig. 24. is a cross-section on line D of Fig. 21, showing a cross-section through the supplementary combustion chamber; a.nd Fig. 25 is an end view of thesmoke-stack-supporting base,showin g the stack-fines arrangedto surround the ore drier and conveyor.

Similar figures of reference refer to similar parts throughout the several views.

Myimproved furnace is composed of two independent concentric cylinders which are detachably secured together, so as to rotate as one cylinder, and which actcooperatively together. Both of these cylinders can be made portions except the feed end sections.

in one piece; but owing to their length and the difficulty of transportation in mountain .ouscountrics I preferably construct them in sectionsof a few feet in lengtln 7 Referring to the drawings, the numeral 1 designates a cylindrical tube which forms the feed end section of the ore-roasting cylinder of my furnace. This cylinder is pro vided with an integral narrow screw-blade 3, which extends round the inner periphery of the 'cy1indcr,thus leaving an axial passage through the cylinder from end to end.

I et designates an additional section of the ore roasting cylinder. This section is secured by bolts 5 to the adjacent end of the feed-section. Thissection 4 is provided with a series of radial diaphragms or partitions 6, which are preferably spirally-curved partitions, as shown in Figs. 1 and 9, and in section 4 and in the central sections .of the furnace, although, if desired, they can be made straight, as shown in one of the sections in Fig-21. .The spiral partitions extend'prac- .tically throughout the entire length of the -tion at each end which is used for secursection with the exception of a narrow poring the section to adjacent sections. Each section in'the length of the furnace is provided with these radial partitions. In'very large furnaces, where the ore-cylinder is of large diameter, I form a cylindrical space (S- throughout the center of the ore-cylinder. (See Fig. 17.) This cylindrical space is, heirever, closed to the ingress of ore, and the cylindrical shell is used to strengthen the diaphragms and to make a larger heatingsurface at the cylinders center, and while I illustrate these partitions arranged spirally through the sections of the cylinder I reserve the right to arrange them in any suit-. able order. I arrange from three to six of these radial partitions in each cylinder, depending largely on the diameter of the cylinder, andprovide each radial partition with alarge number of apertures '7, which, while illustrated round apertures, may be made of any shape. All of the sections ofthe ore-roasting cylinder are provided with these radial In the discharge endwsection, however, theradial partitions terminate at ashort distance from the terminal end of the section. The terminal end of this section is closed by a solid integral end portion 8, and the peripheral-surface of the end beyond the radial portions throughout its entire circumference is provided with a plurality of apertures 9, through which the one discharges, as will be fully explained hereinafter. A trunnion 10 is formed on' the end of the discharge end section, which is supported by a box 11.-

- The box is preferably arranged with a yielding support'in order that the terminal end of the ore-cylinder may be free to expand and contract. The trunnion is preferable made,

hollow, and a cap or plug 10- is removably threaded to it. The hollow trunnion pro and a round top vides an opening into the discharge end of the ore roasting cylinder, through which either air may be admitted or the sulfurous gases be exhausted whenever desired.

The several sections of the cylinder are secured together in anysuitable manner, but

are preferablyprovided with stepped or overlapping ends, which are secured together by bolts 12. By this means an ore-cylinder'can be built it of any desired length. The outer peripherafsurfaee of each section is provided with three or more radial arms 13, placed enough longer in diameter than the ore-cylinder to form a large flue-space between the two. In order to insure the concentric arrange-ment of the two'cylinders,the periphery of the arm is turned off true in a lathe, and bearing-lugs 15 are formed at points in the inner periphery of the cylinder. for the ends of the arms to rest against. Lugs .16 are also formed on each side of the lugs 15, and a stop-lug 17 is formed across the inner end of the bearing-lug. The bearing-lugs and the slot] ugs are arranged, preferably, adjacent to each end of each section, but the stop-lug 17 is arranged only at the head end 18 of each section,as the ore-cylinder sections areinselrted into the sections of the outer cylinderfrom their head ends. The bearing-lugs are preferably finished concentrically with the axis of the cylinder.

The peripheral ends of ICQ the arms are then turned to fit slidably and I closely against the bearing-lugs. The ore-.cyl inder is thus securely locked in the center of the outer cylinder. -The onter cylinder I term the tine-cylinder. I also make this duecylinder in suitable lengths, the eentralsections being preferably of the same length as thelengths of the ore'cylinder. Each connecting-section of the flue-cylinder is provided with end flanges 18, which are bolted together by bolts 18. The flanges are preferably turned both on their ends and edges so as to fit tight together. The end sections of,

the flue-cylinder are shorter than the end sections ot'theere-cylindcr,as they. terminate in a combustion-chamber 19 at the discharge end and in asmoke-stack-supporting casting 20 at the. feed end. This casting consists of a base portion that rests on the foundation,

of the flue-cylinder projects loosely a short distance, leaving a smoke-chamber 21 be-' portion into which the end I The adjacent end of the ore-cylinder prd jects beyond'the flue-cylinder and close to the endwall of the casting. In the top of the feed end casting a smoke-outlet 22 and a smoke-stack 23 are placed. A damper 24 is placed in the smoke-stack.

I arrange a feed-pipe'25 in the end of the head end casting which extends into the aperture in the screw-blades of the end section of the ore-cylinder. This tube is provided with a flanged portion 26, which is secured by bolts 27 to the end of the head end casting. This feed-tube contains a screw conveyer, 28, the shaft 29 of which is hollow. This shaft extends beyond the screw conveyor and is supported by a reduced portion that forms a hearing at the outer end of the feedtube for the screw conveyer and its shaft. The hearing at the outer end of the feed-tube is divided and separated into two

parts

30 and 31,which are connected by ayoke-shaped portion 32, which is formed to provide a space around and adjacent to the shaft of the screw conveyor. A sprocketwheel 32 is secured to theshaft in this space.- Theend of the hollow shaft in the bearing 31, the sprocketwheel which is secured to it, together with a washer 32 which is placed against the shoulder at the bottom of the feed-chamber 33 of the feed-tube, hold the feed-conveyciaand its shaft in rot-ative position in the feed-tube.. A pipe-nipple 34; is threaded into the end of the bearing 31, and abheck-nut 35 isthreaded to the -pipe and is screwed against the hub and locks the nipple to the hub. Ayalve 38 -is secured to the end of the nipple, anda nipple 37 and coupler 38 are secured to the valve. A hose 39 is connected to the coupler and extends to and is connected to a pressureblower 40, which is operatively connected to a source ofpower by a belt 40.

A hopper 4:1 is arranged on the top of the feed-tube to discharge into the rear end of its ore-chamber. An ore-hopper-42 is also arranged around the smoke-stack and is secured thereto in order that it may receive,

heat from'it, and a hopper 48 is arranged on the smoke-stack ore-hopper, in which fluxes are placed. The flux-hopper is so arranged that its discharge-outlet empties into the hop-' per of the feed-tube.

A shaft extends through the discharge end of the ore-hopper, and a suitable feed-roller 44 is rotatively mounted on th shaft 45 in the discharge end of the ore-h pper. The shaft extends beyond the hopper and is pro- I 'Vided with a pulley from which a belt 46 extends to a source of power.

The discharge-outlet of the flux-hopper is arranged to discharge into the feed-hopper above the feed-roller, so that the ore and flux mix together and feed together through the feed-roller. A slide 47 is arranged in the discharge-outlet of the flux-hopper by which the flux can be shut oif when desired. In the base of the head end casting I place a door- 48 to enable the soot that settles in the bottom of the casting to be removed. At the discharge end of the furnace the ore-cylinder extends beyond the end of the flue-cylinder and is built into and is surrounded by a discharge-hood 50, which is pro vided with an ore-discharge chute 51. This discharge-hood is provided with flanged steps 51-, that rest on the brickwork of the furnace, and with a front flanged frame 51?, that rests against the ends of the brick walls. A circular opening 52 is formed in theinner side, through which the end of the ore-cylinder projects, a fume or gas outlet 52 is formed in the top of the hood, and a stack 52 is connected to the opening. The end of the furnace projects through the chamber of the hood to close toits side, where ahollow hub 53 is formed,through which the trunnion 10 at the end of the ore-cylinderprojects. A damper 52 is placed on the fume-outlet. From the bottom of the hood portion of the chute a discharge-spout 54: extends laterally through the brickwork. A swinging door 55 is placed in the mouth of the spout to preventcold air from entering the hood. I

The combustion-chamber 19 is constructed in the brickwork and is preferably separated from the ore-discharge hood by a brick 'wall' :which is arranged close to the dividing-Wall between the hood and thecombustion-charnber, and a flange 58 is also preferably formed on the hood to extend by the flange on the ore-cylinder. By this method ore-dust is kept from working into the combustion-chamber and the products of combustion are kept from Working into the ore-discharge hood. The combustion-chamber 50 is formed by the inc brick walls to surround the ore-cylinder adjacent to its discharge end. It is provided with fire-grates 59 and a door-frame 60, which is provided with coal-doors 6l'and 62 and ash-. pit doors 63 and 6t.

The brick walls which form the combus-- tion-chamber and support the ore discharging hood are bound together by tie-bolts 65 and buckstays 66 and the bearing-blocks 67,

which are arranged on the fdur sides of the brickwork. The frame 51 ,is clamped by the buckstays at the end "of the furnace against the brickwork.

. I preferably support the box thatsupports I the trunnions 9f the ore-cylinder from above and by a swinging support, and in order to accomplish this I make the bearing-block of the tie-rods at the end of the furnace'wide enoughto receive downwardly extending bolts 68, the lower ends of which are secured to the box. The upper ends extend-above the block and are threaded and provided with nuts 69. Between the nuts of each bolt and the top of the bearing blocks I place a spring 70. The springs are adapted to support the weight of the end of the ore-cylinder and act as a yielding medium for the axial expansion and contraction of the ore-cylinder, which also is given a little laterai freedom at the extreme end by this arrangement. 71 is preferably built into ',the rear wall of bed-plate.

- ably mm the T-slots of the bed plate'.

' the free ends of which are threaded and are either one or both ends of the cylinder to set-' the combustion-chamber and is provided with an annular groove 72, into which the end-.of the flue-cylinder extends lo0sely,.$o that it is free to rotate therein.

The flue-cylinder rests and rotates on roll ers 73. Theserollers are arranged to run on the flanges at the opposite ends of the flue-cylinder. The rollers are mounted on shafts 74, which are supported in boxes 75. These boxes are preferablyadjustably arranged on a suitable foundation bed-plate 76,

although, if desired, they may be fixed to a suitable foundation, as shown in Fig. 21. I.

preferably arrange boxes, however,- in the following manner: The bed-plate 76 is arranged to be bolted to a foundation by bolts 77. The bed-plates are provided with T-slots 78 and with a keyway 79, and the boxes are provided'witha depending key portion 80,

that fits slidably into the keyway 79 of the The boxes are provided with bolts 81, the heads 82 of which extend loosely and slid- To each box of each bed-

plate bolts

83 and 84 are connected, which extend toward each other,

connected together by a turnbuckle 85. This adjustable arrangement of the rollers enables either one or both of the rollers to be laterally adjusted in relation to the longitudinal axis of the cylinder to raise or lower the cylinder at either end, and thereby effect its perfect adjustment relative to its fixed feed anddischarge ends and alsoto adjust for unequal settlement of the foundation, which is' liable to take place, and which will allow tie and rub and grind in either one or both of its fixed end connections. Thisadjustable arrangement of the rollers operates in .the following mannerrlf it is desired to raise either one side or the other and at the same time give a lateral movementto the cylinder, one of the rolle'rs boxes is'bolted down tight and the other loosened, and the turnbuckle is manipulated to move the loosened box toward the-cylinder, which will raise it or allow the box to move away from the cylinder, which will lower the cylinder.

In case-it is desired to raiseor lower the 1 cylinder vertically both boxes should be loosened and the turnbuckle manipulated to move the boxestoward or 'away from each other. been moved to effect the-desired adjustment After the rollers and their boxes have of the cylinder they are bolted rigidly to the bed-plate by tightening their bolts 81.

The rollers may bear and run directly on the edges of the flanges of .the cylinders for small furnaces, as shown in Figs. 2, l9,- and 20'; but I preferably provide a special treadring for the rollersto run on for furnaces of large capacity, as the weight is very much,

greater, and as the heat is always high on any size of furnace it is necessary when'the weight is heavy to use a special tread-ring designed with a broad bearing-surface and arranged to keep the high heat of the flanges fromthe rollers. I I preferably carryout this feature the ring is provided with depending lugs 89,

which bear on the edge of the flanges which the intermediate portions of the inner periphery do'not touch, the ed es of the flanges forming air-spaces betwe n the ring and the flanges. air-apertures 90, which extend from the lugs through the periphery of each half of thering.

The'ends of each half of the ring 816 also provided with

lugs

91 and 92, which register opposite each other when the'two halves are These lugsare' also provided with placed on the flanges of the cylinder, as is shown in Fig. 1, and these lugs are .provided with bolt-holes and the halves are bolted together by-bolts 93 to clamp of the flanges.

I preferably use gearing for rotating the tightly to the edge cylinder, as it is positive in its action, al-

though a pulley a'rid'belt or a friction-pulley and pinion could be operatively arranged to rotate it, if desired.

Upon any desired section of the flue-cylinder 1' secure a gear 94, which '9 made in two halves and is arranged to be blted-together by bolts 95. Suitable feet 96 are also formed on each half andare bolted to thepylinder by bolts 97. A gear-pinion 98 is arranged to mesh with the gear centrally underneath the cylinder, and I make the teeth of both gear and pinion long, so that a slight adjustment of the cylinder in any direction by its roller-' bearings will not bind or disengage them.

The power issecured to a shaft 99, which is a supported in suitable boxes 100, which-are mountedon'asuitable bed-plate 101. The bed-plate 101 is bolted to the foundation. A

gear 102 is secured tothe shaft 99, and a pinion'103 is arranged to mesh with it. The pinion 103 is secured to a shaft 104, which is supported in a box 105 on the bed-plate 101. This bed-plate is bolted to the foundation lry the bolts 101:. A sprocket-wheel 106 is secured to the shaft 104, and a chain 107 extends-from the sprocket to a source of power,

. which maybe arranged to impart several different speeds to the sprocket. 10

6, and consequently to the cylinder. I

Iarrange thecylinden-at a slight incline, the feed .end being the highest in order that we may feed naturally as the cylinders rotate toward the dischargeend, and preferably arrange for the amount of inclination of the cylinders in the foundations and in the foun datio'n bed-plates, which I make preferably tapering on their top surfaces, where the roller-boxes are secured. The ore-cylinder is prevented from any slipping movement in the fluecylinder, due to the inclination of the cylinders, by its radial arms and the stop-lugs in the flue-cylinder, against which its arms rest; but it is necessary to employ some means to prevent the flue-cylinder from working toward the discharge end. I pref erably accomplish this by providing one of the central sections of the cylinder with a circumferential ring 108, which may be attached to or may form an integral part thereof, and preferably place thering adjacent to the driving-gear of the cylinder and arrange on each side of the cylinder vertical.

arms 109 and 110. I preferably secure these arms to the bed-plate that supports the driving mechanisrnby the bolts 111 and 112.

The top of the vertical arms, which are arranged at substantially the horizontal center ofthe cylinder, are provided with yoke-shape ends,through which a pin extends. Upon this pin, between the yoke-shape d endd. I mount a roller, which bears against the adjacent side face of the ring 108, and in order to support the arms against the weight of the cylinder I extend an anchor-bolt 113 from each arm from near their tops forward toward the head end of the cylinder down into the foundation.

In order to retain the heat in the cylinders,

I surround them with a casing 114, which may be made of sheet-iron or cast-iron or of any other suitable material. I divide this casing intosections of substantially the same lengths as the cylinders, so as to bring all the joints of these parts of the furnace at the same points. The casing extends from the foundation on which the furnace rests and to which it is secured by bolts 114 completely around it, and the sections are preferably arranged to overlap eachother and are secured together by the bolts 115. These bolts are pivotally attached to one section at one end and swing over into a slotted lug 116, against which the nut 117 of the bolt is tightened, thus bolting the sections together. (See Figs. 1, 8, 15, and 16'.)

As some ores are more apt to dust than others in passing through the furnace and as the ore-dust is sometimes valuable, I provide the fume-stack of the ore-discharge hood with a dust-s ttling-chamber attachment 118.. This dust-settling chamber comprises a narrow sheet-iron extension to the fume-stack. The stack is made with a bend and then to extend off at its top side in an angle portion 119 a short distance above the top of the hood and then to again bend and extend in a vertical portion 120 upward as far as is desired. The extension portion 118 extends from the angled offset out even with the vertical portion of the upper end of the stack and with a downward angle portion 121 to a narrow pipe portion which extends into any suitable receptacle, but preferably into the cooler 12:2,which receives the hot ore from the furnace. This cooler is simply a water-jacketed trough 123 with a screw conveyor in it, which is arranged to receive the ore discharged from the spout 54 of the furnace and cool it as it is moved through it by the screw conveyer. It does not form any part of my invention.

As some ores are entirely too wet as they come from the pulverizing machinery to be dried by the heat from the smoke-stack that comes in contact with the ore in the hopper that surrounds the stack, it is necessary to provide some means to very thoroughly dry the ore before it is fed into the furnace, and as there is a great deal of heat radiated from the furnace itself I preferably arrange to utilize this heat to thoroughlydry the ore in the following manner: In addition to making the surrounding casing of suitable lengths I also make each section in two parts, separating them at their tops and making each part enough less than a half to form a'space in the top of the casingalong its entire length. In this slot I place an ore-drier 123-, meter ably arranging it'so that it inclines from the dischargeend toward the feed eudof the fur.- nace. This ore-drier preferably comprises a semicircular or U-shaped trough, in which a screw conveyer 124 is operatively'arranged.

The shaft of the screw-conveyor ismountedin suitable journals 125 and extends beyond the end of the drier atithe feed end of the furnace and is supported bya bracket 126, which is secured to the flux-hopper. A

cone-pulley 127 is mounted on the shaft and is connected by belt to a suitable source of power. This enables several rotative speeds to be given to the screw.

As the ore-drier inclines in one direction and the furnace inclines in the opposite direqtion it is necessary to provide the sides of the ore-conveyer with depending side flanges 128 and 129, which extend down into the slot in the top of the casing, from these depending flanges. Lateral flanges 130 and 131 extend, which lap. over and rest on t he both halves of the casing and are secui ed to them by bolts132. (See Figs. 21, 22, and 23.) By this'arrangement the heat jwhich radiates from the flue-cylinder rises ihto direct contact with the bottom of'the ore-drier. Thus too the ore travels through a high heat substantially the whole length of thefurnace. A small flue 133 can also be made, if desired,

in the wall 134 of the combustion-chamber into the space between the flue-cylinder and the casing. A discharge-spout 135 extends from the discharge end of the ore-drier into the hopper41 of the ore-feeding device of the furnace.

I preferably place a hopper 137 at the head end, of the drier, into which the ore is fed. In order to arrange the drier, centrally in the top of the casing, it is necessary to provide the smoke-stack supporting or base casting 20 of the furnace with twc separated

fines

138 and 139, extending from its top, and to arrange them to form a central opening be- 6o into whicha pipe 151 is also extended. This and 24) and may be made much smaller than the combustion-chamber at the discharge end of the furnace. It is provided with grates 141 and fuel-doors 142 and ash-pit doors 143.

. Where oil can be obtained, I prefer it as a to the front of the hood by the bolt .147.

fuel to coal :or wood, as it gives along flame, and incaseit is used the grates need not be employed.

The flue-cylinder is provided at that portion that passes through the supplementary combustion-chamber with a number of apertures 144, arranged equidistant apart around its circumference. The products of combustion flow through these apertures as the cyl-v inder rotates into the fine-cylinder and stirrounds the ore-roasting cylinder and flows to the stack, and thus heat the ore at the feed end much hotter and more quickly than the maincombustion-chamberis capableofdoing.

As some sulfid ores contain a large pet'- centage of sulfur, which is liberated in my furnace and normally flows to waste from the stack of the ore-discharge hood, and as this sulfur gan be saved and be very easily converted -into sulfuric acid with but very little expenseand can be madean elemen'tof value,

(especially if the ore is a copper ore and it is desired to extract the copper with solutions after roasting the ore, as sulfuric acid is one of the principal chemicals of the solutions used .in the extraction of copper,) I arrange each furnace so that a sulfuric-acid-niaking apparatus can bereadily attached and the sulfur be readily withdrawn from t-he ;furnace and converted into sulfuric acid. I preferably carryout this feature of myinvention as follows: I remove the cap 10-" from the hollow trunnion of the ore-dischargeend of the ore cylinder and extend a pipe 145 through it into the cylinder. This pipe is supported by a bracket 146, which I secure The pipe 145 extends to anexhaust blower or fan 148, which is connected operatively to asource of power bya belt 149. From the ex haust-fan a pipe leads to a lead-lined tank 150,

pipe ads to a supply of steam In the bot- ,tom the tank several inches of water are placed. Two

additional tanks

152 and 153, similar to the tanks 150, are connected by

pipes

154 and 155 together. A filter-tank 156 is connected by a pipe 157 with thetank end of the furnace.

153, and a valve-controlled pipe 157" is placed in the bottom of the filter-tank to draw from .itthe sulfuric acid. The sulfurous gases are exhausted by the exhaust-fan from the orecylinder and flow into the tank, into which steam is also constantly flowing from the pipe 151, which precipitates the sulfurous gas into the water, with which it forms sulfuric acid.

This flows from one tank to'the other and is filtered, and the acid is drawn from the filter.

-This systeniof tanks is commonly used in the art of making sulfuric acid and does not form any part of my invention;

The operation of my improved ore treating furnace is as follows: The furnace is heated byzthe products of combustion passing into the flue-cylinder and surrounding the orecylinder. The heat used varies from 500 to 1,000 Fahrenheit and'generallydoes not exceed 600. The flue-cylinder is rotated by the gear-driving mechanism connected to it and the ore-cylinder which is attached tdit.

The ore is fed into the hopper 41 of the feed device of the furnace and is fed in the ma nace by the screw-28, which is rotated by the sprocket-wheel 32". The ore drops from the discharge end of the feed device into the screw-blades of the first section of the cylinder, and the cylinders are rotated in a direction that will cause the screw ofthe first section of the ore-cylinder and also the spirallyarranged partitions of the. other sections to feed the ore as it is moved by the rot-ative movement of the cylinder into and toward the discharge end of the cylinder, and as the cylindersare also inclined downward from the. feed end tothe discharge end'the ore feeds from the screw of the first section into the spaces between the partitions and through the furnace. The partitions carry the ore up as the cylinder rotates, and as the ore runs down toward t-hecenter of the furnace it drops through the holes in the partitions and falls onto the next partitionbelow. The ore is-thus" very thoroughly rabbled and is very As the ore travels toward the discharge end of the furnacethe heat increases, and it roasts gradually and discharges through the aperevenly exposed tothe heatandevenlyroasted.

tures 9 at the discharge endinto the'discharge-hood and-out through the spout 54 into the cooler 122, and the sulfur, arsenic, antimony, and other deleterious elements in tanks illustrated in Fig. 21 are "attached. \Vhile .the ore is feeding through the furnace and is roasting-a steady volume of air is forced into the ore-chamber at the feed end by the air-pressure fan 40, which forces air through the hose and hollow shaft of the feedscrew of the ore-feeding device at the feed Thus a supply of oxygen I20 the ore are volatilizedan d flow also, out'of one cylinder into the hood andthrough the stack to the atmosphere, In case,-however, it'is desired to save the sulfurous gases and convert them into sulfuric acid, then the ex haust-fan and its connecting-pipes and the gold will drop down metallic gold is continuously furnished that oxidiz s the the exhaust for withdrawing the sulfur can be replaced by an air-pressure fan or blower and a supply of air forced into the ore-cylinder from the discharge end also.

Some ores roast much better if a flux is mixed with them, While other ores will roast nicely without a flux. Any of the commonly.

used roasting-fluxes may be used with this furnace. The ores in passing through this furnace are mufiied from contact with the products of combustion from the combustionchamber.

The sulfids are converted by the roast to soft friable soluble sulfates, which are easily soluble in solutions, and also to oxide. The and can be readily saved by amalgamation. The silver, if the heat is not carried above 700, will remain as an oxid or a low sulfid and can also be saved by amalgamation. If. however, the.

heat is carried much above 700? Fahrenheit, the silver will pass to a-sulfate and then can be saved by leaching with suitable solutions. The copper and zinc will pass to sulfates, and they can besaved by leaching with suitable solutions.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1 In an ore-treating furnace, the combination of a combustion-chamber, a stack-chamher, and a revoluble roastingcylinder comprising an ore-cylinder and a fiue'cylinder surrounding said orecylinder, said flue-cyl- 'inder communicating with said combustionchamber and stack-chamber and said ore-cylinder extending through said combustionchamber.

2. In an ore-treating furnace, the combination with thecombustion-ohaniber, of an orccylinder passing through said combustion-- chamber,a flue-cylinder surrounding said ore-- cylinder and secured rotatably thereto and extending from said combustion-chamber, a suitable support at the opposite end of said flue-cylinder, a stack in said support, means for feeding ore intosaid ore'cyli'nder, and means for rotating said cylinder.

3. In an ore-treating furnace, the combination of a combustion-chainber, a stack-chamher, andla revoluble roastingcylinder comprising an ore-cylinder 'anda flue-cylinder surrounding said ore-cylintler, said flue-cy inder communicating with said combustionchamber and stack-chamber and said ore-cylinder extending substantially through said stack-chamber. 1

4. In an ore-treating'furnace, the combination with a combustion-chamber, of an inclined ore-cylinder extending into said com bustion-chamber, a flue-chamber connected to said combustion-chamber and arranged to cylinder rota'tively form a fine for the products of combustion round the ore-cylinder, means, for removably securing said ore-cylinder to said flue-cylinder, a stack arranged inoperative relation to said flue-cylinder and combustion-chamber, means incl uding gearing for rotating saidcy inders and means including ascrew'for feeding ore into said ore-cylinder,substantially as described.

5. In an ore-treating-furnace the combination with a combustion-chamber,of a fine-cylinder rotatively mounted in communication with said co'mbustion-chamber, an ore roastint: cylinder axially mounted in said flue-cylinderandextendingthrough saidcombustionchamber, means including radial arms for TB" movahly securing said oar-roasting cylinder in said fine-cylinder, a stack in operativerelation to said flue-cylinder, means forfeeding,

ore to said roasting-cylinder and means for.

rotating said fine-cylinder, substantially as described. I

6. In an ore-treating furnace, the combination with acombustiou-chamber, of a flue-cylinder rotatably mounted and con ne'ct-ed at one end with said coml'iustion-chamber, a stack at the opposite end of said flue-cylinder, an oreroasting cylinder'centrally supported in said flue-cylinder and projecting beyond it at each end extending, through-said combustionchamber, an ore-feeding tube extending into the opposite end of said ore-cylinder from said combustion chamber comprising a hollow shaft in said tube, a screw conveyer on said shaft, a hopper on said ore-feeding tube con' necting with said screw conveyecand means fOIijOtttilDg said shaft and screw, means ineluding, an air-blower for forcing air lhroueh said shaft into said ore-cylinder,substantially as described.

7. In an ore-treating furnace, the combination with a combustion-chamber and a smokestack, of a flue-cylinder rotatably mounted and connected with said combustion'chamber, an ore-roastingcylinder axially arranged in said flue-cylinder, a screw-blade in the inner lOC periphery of the feed end of said ore-cylinder and a plurality ofpartitions extending from the screw-blade through saidore-cylinder to its-discharge end, means for feeding ore into said ore-cylinder, means for discharging ore from said ore-cylinder, and means for rotating both the fine and the .ore cylinder, substantially as described.

8. In an ore-treating furnace, the combination with the combustion-chamber, the fluemounted therein, and the stack, of an ore-treating cylinder axially secured in said fiuercylinder to rotate therewith, means within said dre-treating cylinderand including longitudinal partitions for rabbling the ore, means. including a screw conveyer for feeding ore into said ore-cylinder, and ore-discharge apertures in the discharge end of said-ore-treating cylinder, substantially as described.

1 9. In an ore-treating furnacejthe combinasaidflue-cylinder and provided with a pluing discharge-apertures for discharging ore to.

' her, a stack arranged at the opposite end of said flue-cy1inder fromsaid combustion-chamaxially supported in ore-roasting cylinder,means including an air-. blower and a pipe extending into'said ore- 3o iug ore from. said ore-treating cylinder, substack, of a flue-cylinder operatively connectstack, an ore-roasting cylinder removably selengths, means including supporting-rollers ore-roasting cylinder for feeding ore into said partitions, numerous apertures through-said tially as described.

ore-roasting cylinder removablysecured in the center of'said flue-cylinder, and comti'on-with the combustion-chamber, the linecylinder rotatively mounted and the stack, of an ore-treating furnace axially supported in rality of spirally'and longitudinally arranged partitions, means including-a hopper for feeding ore into said ore-cylinder, means includfrom said cylinder, means including an airhlower for admitting air into said ore-cylinder, and means for rotating said flue-cylinder and said ore-cylinder, substantially as described,

10. In an ore-treating furnace, the combi; nation with a-combustion-cha'mber, of a fluecylinder at one end of said combustion-chamber,meansincludingsupporting-rollers for rotating said cylinder, an ore-roasting cylinder said flue-cylinder havinglts discharge end in operative relation to said. combustion-chamber, a rabbling device com-- prising radialanembers in said ore-roasting cylinder, an ore-feeding device comprising a conveyer exten'diug'into the feed end of said roasting cylinder for delivering air into said ore-roasting cylinder,a nd means for dischargst-antially as described.

11. In an ore-treating furnace, the combi-' nationwith the combustion-chamber and-the ed to said combustion chambers and said extending lengthwise cured in the Eenter of said flue-cylinder having spirally-arranged radial members within it, an ore-feeding tube extending into said ore-roasting cylinder containinga hopper and an ore-conveyer, a suitable support for the discharge end of said ore-roasting cylinder, a hood surrounding the discharge endof said ore-roasting cylinder, means for discharging ore from the discharge end of said ore roasting cylinder into said hood and means for rotating said cylinders, substan- 12. In an ore-treating furnace, the combination with the combustion-chamber and the stack, of a flue-cylinder comprising connected sections .of predetermined lengths, of an posed of connected sections of predetermined and gearing for rotating said cylinders, means ncluding an ore-conveyer extending into said ore-roasting cylinder, a hood surrounding the discharge'e'nd of saidore-roasting cylinder, means for discharging ore into said hood, 2.

trunnion on the discharge end of said cylinder and an automatically-adjustable support for said trunnion, substantially asdescribed. 1

13. In an ore-treating furnace, the comb nation withthe combustion-chain her and th stack, of a revolving flue-cylinder comprising connected sections of predetermined lengths operatively connected to said combustion-chamber and stack, and an ore-roasting c'ylinder reinovably secured in said fluecylinder and comprising connected sections of predetermined lengths a rabbling device comprising perforated radial members in said ore-treating cylinder, an ore-conveyor arranged to feed ore into said ore-roasting. cylinder,a yielding support for the discharge end of said ore-treating cylinder, means including discharge-011 tlets for discharging the ore'from said ore-roasting cylinder and means including supporting=rollers and gearing for rotating said cylinders, substantially as described. 14. In an ore-treating furnace the combi nation with the'combustion-chamber and the stack, of a flue-cylinder revolubly mounted extending into said combustion-chamber and connected to said stack, adjustable rollers arranged to support said flue-cylinder revolubly, means including gearing for rotating said flue-cylinder, and an ore-roasting cylinder secured in the center of said flue-cylinder provided w-ith perforated radial partitionsthrough it, substantially as described.

15.,In an ore-treating furnace, the combination with the combustion-chamber and the stack, of a flue-cylinder com prising connect-- ed sections of predetermined lengths and operati vely connected to said combustion-chamber'andst-ack', adjustable rollers arranged to support said flue-cylinder revolubly, a suitable support for said rollers, means including gearing for rotating said flue-cylinder, an oretions'of-predetermined lengths secured in said flue-cylinder, perforated radial partitions in said ore-"treating cylinder at its central portion, a screw portion at .its feed end, a cylin and stack and comprising a plurality ofcj linder sections secured together, suitable roller-supports for said cylinder, an ore-roastiug cylinder in said flue-cylinder, a sectional roasting cylinder comprising connected seccasing arranged to' inclose said flue-cylinder 1 at a short space from it and means including a conveyer'for feeding'ore into-and means in-v inder and said source of heat, a flexible swinging support for the discharge end of said oreroasting cylinder, ore-discharge apertures in the discharge end of said ore-roasting cylinder, means for preventing the heat from onteringsaid ore-discharge aperturesaud means including a tube extending into the opposite end of said ore-roasting furnace for feeding ore to said ore-roasting furnace and means including a tube and an air-blower for forcing air into said ore-roasting cylinder, substantially as described. 1

18. In an ore-roastingl furnace the combination .of a combustion-chamber with a revoluble fine-cylinder operatively connected at one of its ends with said combustion-chamher, a stack operatively connected to the opposite end of said flue-cylinder, a support for said stack, a suitable connection between said stacks supportand the connecting end of said fl tie-cylinder, an ore-roasting cylinder axially secured in said flue-cylinder, provided with substantially diametrically-arranged perforated partitions spirally arranged axially of said ore-roasting cylinder, an ore-feed tube secured to said stack-support and extending into said ore-roasting cylinder, a screw conveyer in said tube provided with a hollow shaft, means for rotating said screw conveyer and shaft, andan air-blower operatively connected to said hollow co'nveyer-shaft, substantia ly as described.

19. In an ore-treating furnace the combination of'a combustion-chamber and a smokestack, with a revoluble flue-cylinder connected to said combustion-chamber and stack, an

.ore-roasting cylinder extending throughsaid iiuecylinder, anore-feeding device comprising an ore-conveyer arranged to feed ore into said ore-roasting cylinder, a hopper arrangedon said ore-feeding device connecting with said conveyor, an ore-drier, a flux-hopper connected to said drier and arrangedto discharge into the discharge-outlet of said drier, and a rotary feed-regulating device arranged to feed the ore and flux together into the hop 'per of the ore-feeding conveyer of said oreroasting furnace, substantially as described. 30. In an ore-treating furnace, the combination with a combustion-chamber and a stack, of a flue-cylinder connected to said combustion-chamber and stack, an ore-roasting cylinder secured in said flue-cylinder, a casing surrounding said flue-cylinder, means including rollers and gearing for rotating said cylinders, an ore drier and conveyer arranged along the top of said casing and an ore-feeding device connected to said ore drier and conveyer arranged to receive ore from said ore drier and conveyer and feed it into said ore roasting furnace, substantially as de scribed. I

211 In an ore-treating furnace, the combi nation with the combustion-chamber and the stack, of a stack-supporting casting, an dieroasting cylinder comprising connected sections extending through said combustionchamber and into said stack-supporting casting, radial arms on said ore-roasting cylinder, a flue-cylinder surrounding said ore-roasting cylinder, and connected with the said combustion-chamber and adapted to form a flue round said ore-roasting cylinder, longitudinal lugs on the inner periphery of said fine- "cylinder adapted to receive between them the ends of the radial arms of said ore-roasting cylinder and transverse stop-lugs adjacent to.

said longitudinal lugs arranged and adapted to prevent endwise movement of said oreroasting cylinder in said flue-cylinder, substantially as described.

22. In an ore-treatingfurnace, the combi' nation of a combustion-chamber and a stack, with a flue-cylinder comprising connected sections of predetermined lengths and connected with said combustion-chamber and stack, an ore-roasting cylinder comprising connected. sections of siinilar lengths, a flue-cylinder removably secured in said flue-cylinder and of enough smaller diameter tofornn a fluespace between it and the inner periphery of said flue-cylinder,an ore-feeding con veyer arranged to feed ore into one end of said oreroasting cylinder, means including a blower and a pipe for introducing air into said ore; roasting cylinder, means including apertures for dischangin g ore from said ore-roastin g cylinder, a casing surrounding said flue-cylinder and provided witha longitudinal space in its top portion, a combined ore conveyer and drier arranged in the space in said casing and arranged to discharge into the ore-feeding conveyer of said ore-roasting cylinder, and means including gearingfor rotating said cylinder, substantially as described.

23. In an ore-treating furnace, the combination with a combustion-chamber and a stack,of a revoluble flue-cylinder connected to said combustion-chamber and stack,and comprising cylindrical sections of predetermined lengths provided with flanges at their ends,

an ore-cylinder within said flue-cylinder and extending through said combustion-chamber, rollers arranged to revolubly support said flue-cylinderysuitable supporting-boxes for said rollers, a bed-plate for the supportingboxes of said rollers and means including an adjustable connection between the supporting-boxes of said rollers for adjusting said rollers to raise or lower said flue-cylinder, substantially as described.

2%. In an ore-treating furnace, the combination with the combustion-chamber and the stack, of a flue-cylinder revolnbly connectedcured together, a tread-ring secured to a predetermined member of the flanges of said flue-cylinder provided with introverted lugs arranged to bear at several points equidistant in the circumference of said lugs and provided with receding peripheral portions between said intnoverted lugs adapted to form air-spaces, substantially as described.

25. In an ore-treating furnace, the combination with the combustion-chamber and the stack, of a flue-cylinder revolubly connected to said combustioirchamber and stack, and comprising cylindrical sections of predetermined lengths provided with flanged ends secured together, a tread-ringsecured to a predetermined member of the flanges of said fluecylinder arranged with introverted lugs arranged to bear atseveral points equidistant in the circumference of said lugs and pro-.

vided with receding peripheral portions between said introverted lugs adapted to form air-spaces and having radial apertures extend from said introverted lugs through said treadrings, substantially as described.

26. In an ore-treating furnace,- the combination with the combustion-chamber and the stack, of a fine-cylinder revolubly connected to said combustion-chamber and stack, a-nd comprising cylindrical sections of predetermined lengths provided with flanged ends secured together, a tread-ring secured to a predetermined inemberof lheflanges of said fluecylinder arranged with introverted lugs a-r- Y ranged to hear at several points equidistant in the circumference of said lugs and provided with receding peripheral portions be 4 tween said introverted lugs adapted to 'form ai-r-spaces'and having radial apertures extend from said introverted lugs through said tread-rings, supporting-rollers arranged under each opposite side of said cylinder, supporting-boxes for said rollers, abed-plate for said boxes, a guide-slot in said bed-plate,

inder, substantially as described.

27. In an ore-treating furnace, the combination with the combustion-chamber and the' stack, of a H ue-cylinderrotatably mounted in;

a tongue on each of said boxes fitting into said guide-slot, =T-slots in said bedplate, clamping-bolts extending from said-rollersupporting boxes into said T-slots, a bolt secured to each of said roller-supporting boxes and extendingtoward each other and provided with threaded ends, and a turnbuckle threaded to the ends of said rods and means including gearing for rotating said cylsaid combustion-chamber and stack, an orcroasting cylinder securedln said flue-cylinder and extending beyond it at its discharge end through said combustion-chamber and having a closed end, a hollow trunnion on the end of said ore-roasting cylinder, a cap or plug removably secured to saidhollowtrunnion, a bearing-box mounted on said trun nion, a support above said box attached to i said furnace, depending rods secured to said support at one end and at their opposite ends to said bearing-box, suitable springs arranged on said rods above said support, whereby said bearingebox is yieldingly supported, substantially as described. t

. 28. In an ore-roasting furnace, the combicombustion-chamber formed at one extremity thereof and arranged to permit the products of combustion to pass through said flue-cylinder, a suitable smoke-stack 'operatively connected to the opposite end of said flue-cylinder, an ore-roasting cylinder secured in the center of said flue-cylinderprovided with perforated spirally-arranged radial partitions and having said ore-roasting cylinder of enough smaller diameter to allow the products of combustion of said combustion-chamber to surround it as they pass through said i] ue-cylinder and having said ore-roasting cylinderarranged to receive ore at the stack end of said furnace and to discharge ore at the combustion end of said furnace and having its discharge end extend beyond the end of said flue-cylinder and through and beyond said combustion-chamber, a hood arranged to surround the discharge end of said ore-roastore-roasting cylinder, a supporting bearingbox on said trunnion, a support above said bearing-box,rods extending through said supon the upper end of said rods and a spring on each rod between said nuts and said support whereby said trunnion bearing-box and the discharge end of said ore-roasting cylinder is yieldingly supported, scribed.

nation with the flue-cylinder and one oreroasting cylinder extending through said fluecylinder, of a stack'at one end of said flue- ,cylinder, a combustion-chamber at the oppoinclose the discharge end of said ore-roasting cylinderand positioned adjacenttothe end of said due-cylinder, a hood surrounding the includinga flange formed on said ore-roasting cylinder and a partition between said combustion-ch'amberand said hood, for preventing'the products of combustion from passing to the discharge end of said cyliuder,ore discharge apertures arranged in the 'end of said ore-roasting cylinder to discharge into to convey said o're away from saidore-roasting cylinder, substantially as described.

30. In an ore-treatingfurnace, the combination with tlie'revoluble flue-cylinder, the

the ore-roasting cylinder centrally sec'n red in said flue-cylinder and extending beyond said substantially as de-- 29. In an ore-treatingfurnace th e comm-- site end of said due-cylinder constructed toend of said ore-roasting cylinder andmeans said hood,aud a spout arranged on said hood,

nation with the revolubleflue-cylinder, of a 7 ing cylinder, atrunnion on the end of said KOO port and secured at one end to said bearingbox and extending above said so pport, nuts IIO combustion-chamber and the smoke-stack, of

flue-cylinder and through and beyond said ranged to surround the end of said ore-roasting cylinder, means including tierods and bucksta'ys for binding said combustion-chamher and said hood together, a closed head end at the extreme end of said ore-roasting cylinder, ore-discharge apertures in the periphery of the end of said ore-roasting cylinderarranged to discharge ore into said hood, an oredischarging spout extending from said hoodbeyond said combustion-chamber and means including a partition for separating said hood from said combustion-chamber, substantially as described. I

31. In an ore-treating furnace, the combination with the flue-cylinder and the stack,

of the ore roasting cylinder extendi ng through said flue-cylinder, a combustion-chamber arranged to surround the discharge end of said ore-roasting cylinder, a hood surrounding the end of said ore-treating cylinder and built into said combustion-chamber, means including tie-rods and buckstays for securing said hood and said combustion chamber together, an aperture on said hood opposite the end of said ore-roasting cylinder, a trunnion on said ore-roasting cylinder extending through said aperture, a block projecting from the top of said hood and combustion chamber, means including said tie-rods for securing said biock to said hood and combustion-chamber, a journal-box arranged on said trunnion torevolubly support the adjacent end of said oreroasting cylinder and bolts secured at one end to saidbox and extending vertically up through said projecting block, a coiled spring in each bolt resting on said block and a nut on each bolt resting on each spring whereby said trunnion journal-box and the discharge endof said oreroasting cylinder is swingingly and yieldingly supported, substantially as described.

32. In an ore-treating furnace, the combir 1 nation with a revoluble flue-cylinder, of an ore-roasting cylinder secured within said fluecylinder to'r-otate therewith, the diameter of the ore-roasting cylinder being enough smaller 4 than that of the tine-cylinder to form an annular flue space or chamber between the two, a combustion-chamber connected at .one end to said flue-cylinder, a stack connected at its opposite end, a supplementary combustionchamber arranged to surround said flue-cyl- -inderadjacent to said stack and suitable flueapertures through theperiphery of said fluecylinder registering with said supplementarycombustion-chamber, substantially as described.

33. In an ore-treating furnace, the combination with the revoluble fine-cylinder, of an ore-roasting cylinder of smaller-diameter than the said fiuecylinder, extending centrally through said flue, a combustion-chamber connected at one end of said flue-cylinder, a stack at the opposite end, and a supplementary combustion-chamber arranged to surround said flue-cylinder, flue-apertures in the periphery of said flue-cylinder arrangedto communicate with said supplementary combustion-chamber, means for revolving said fluecylinder, means for feeding ore into said oreroasti'ng cylinder at the" stack end of said furnaceand means for discharging ore at the combustion end of said furnace, substantially as described.

34. 'In an ore-treating furnace, the combination with the revoluhle flue-cylinder, of an ore-roasting cylinder of smaller diameter than the said flue-cylinder, extending centrally through said flue, a combustion-chamber connected at one end of said flue-cylinder, a stack at the opposite end, and a supplementary combustion-chamber arranged to surround said flue cylinder, fine-apertures in the periphery of .said flue-cylinder arranged to communicate with said supplementary coinbustion-ch-amber, means for revolving said flue-cylinder, and a casing surrounding said cylinders, means for feeding ore into said oreroasting cylinder at the stack end of said furnace and means for discharging ore at the combustion end of said furnace, substantially as described.

35. In an ore-treating furnace, the combination with the combustion-chamber, the stack and the flue and ore-roasting cylinders arranged at an inclination from the feed end down toward the discharge end of said cylinders, a flange on said flue-cylinder, a vertical arm secured to a suitable foundation and arranged on each side of said flue cylinder, a roller pivotally mounted in the top of each arm in bearing engagement with said flange and an anchor-bolt secured at one end to each arm and extending toward the feed end of said cylinder and secured to a suitable foundation at its opposite end Whereby a bearing is provided for the end thrust of said cylinders, substantially as described.

36. In an ore-treating furnace, the combination of the rotatable flue-cylinder, the cornbustion-chamber, the flue-cylinder connected at one end therewith and thestack, with the mufded ore-treating cylinder secured in the center of said flue-cylinder, an annular-fluespace between the outer periphery of said or-eroa'sting-cylinder and the inner periphery of said tluecylindeigmeansincluding perforated spiral blades or partitions for rabbling and feeding ore through said muffled ore-roasting cylinder, means including an ore-conveyor secured to said stack for feeding ore into said muffied ore-roasting cylinder, means for dis-' charging ore from said muffied ore-roasting cylinder, a casing surrounding said flue-cylinder, means including an ore-coiiveyer arranged in said casing to communicate with the interior thereof and with said ore fe'eding device of said muffied cylinder for drying ore and feeding it to saidmuiiiiedore-roasting cylinder, substantially as described.

37. In an ore-treating furnace the combination with the ore-roastin g cylinder,t-he comveyer, means including a cone-pulley atchamber into which the discharge end of said curing said sections together, an open space end of said ore-roasting cylinder, a gas and extending from said second bend, a laterallystaclgand a discharge-spout extending from bu'stion-chamber. and the stack, of a casing 1 comprising two arched half portions surrounding said cylinders constructed in sectionsof predetermined lengths, means including pivota lly-swinging clamping-bolts for sebetween said half portions of said casing over said cylinders, an ore-feeding trough fitting in said space and secured to said sections and extending axially over said cylinders, a screw conveyer operatively mounted in said conore-roasting cylinder extends, discharge-apertures in the end of said ore-roastingcylinder arranged to discharge ore into said chamher or hood, an ore-discharge'spout leading from said chamberor hood, astack connected to the top of said chamber or hood arranged to convey the gases and fumes from said oreroasting cylinder to the atmosphere, a dustchamber formed in" said stack and a depending spout leading from said stack to a suitable receptacle, substantially as described.

39. In, an ore-treating furnace the combinationwith the combustion-chamber, the fiuecylinder, the ore-roasting cylinderextending through said flue-cylinder, and the stack, of a chamber or hood formed round the discharge fume and dust stack at the top of said chamber or hood extending vertically above said furnace, a bend in said stack, an angled por-. tion in said stack extending from said bend, a second bend in said stack, a vertical portion extending dust-chamber formed integral with said angled portion of said gasand dust saidv dust-chamber to a suitable receptacle, substantially as described. v

40. In an ore-treating furnace, a revoluble roasting-cylinderhaving a trunnion at one end, means for'heating' said cylinder externally, and a depending trunnion-support constructedto move longitudinally with the trnnnion as the cylinder expands or contracts.

41. In an ore-treating furnace, a revoluble roasting-cylinder havinga trunnion at one In an ore-treating'furnace, the combination of a combustion-chamber, a circular opening in said chamber, a flue-cylinder ex tending at one end into the opening in said combustion chamber, rollers arranged to support said flue-cylinder, means including gearing for rotating said cylinder, a stack-supporting casting at the opposite end of said flue -cylinder, .astack connected with said supporting-casting, an ore-roasting cylinder secured in said flue-cylinder, an ore-feed ing conveyer secured to said' stack-supporting casting and extending into said ore-roasting cylinder, and an. ore-drier arranged to receive the heat from said flue-cylinder and said smoke-stack, and to discharge into said ore-feedingdevice,substantiallyasdescribed. Q

44. In an ore-treating-furnace, the combination with the combustion -chamber, the stack, the flue-cylindelyand the ore-roasting cylinder, extending through the combustionchamber, of a pipe extending into said oretreating cylinder and its discharge end, a suction or exhaust blower or fan secured to said pipe and arranged to exhaust the sulfurous gases and the-fumes from said ore-roasting cylinder, and a pipe leading from said exhaust-blower to a condensing-tank, substantially as described. 7

45. In an oretreating furnace, the cornhination with the combustion chamber, the stack, the flue-cylinder, and the ore-roasting cylinder, extending-through the combustionchamber, ofa hollow trunnion on the discharge end of said ore-roasting cylinder, a pipe extending through said hollow trunnion into said ore-roasting cylinder, means for supporting said pipe in operative position in said trunnion, an exhaust blower or fan connected to said pipe, arranged and adapted to exhaust sulfurous gases from said ore-treating furnace, a system of tanks arranged and adapted to receive the sulfurous gases exhaustedfrom said furnace by said exhaustblower, and a" pipe connecting said exhaustblower with said system of tanks, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses. ARON M. BEAh Witnesses: I

G. SARGENT ELLIOTT, JOHN E. WIGHTMAN.