US823393A - Roasting-furnace. - Google Patents

Description

PATENTED JUNE 12, 1906. A. W. CHASE. ROASTING FURNACB.

APPLIGATIO FILED JULY 1,190`3.

6 SHEETS-SHEET 1.

Mummy No. 823,393.k

PATENTED JUNE 12, 1906. A. W. CHASE. ROASTING FURNAGE. APPLICATION FILED JULYl, 1903,

6 SHEETS-SHEET 2.

Q/vihwooea No. 823,393. PATENTED JUNE l2, 1906.

A. W. CHASE. ROASTING PURNACE.

APPLICATION FILED JULY 1, 1903.

` 6 SHEETS-SHEET s.

PATENTED JUNE'1z,19o6. A. vmms;v ROASTING FURNACB.

APPLICATION FILED JULY 1. 1903.

e MEETS-SHEET 4.

|| llll llllrllll No. 823,393. PATENTED JUNBlZ, 197046.

A IVW-CHASE, ROASTING PURNAOB;

APPLICATION IILBD JULY 1. 1903. I

' e SHEETS-SHEET 6.

fi. W/zws.

@mi humaan UNITED STATES PATEN T oEEIoE.

' ARTHUR w. cHASE, or NEW YORK, N. Y.

RoAsTlNG-FURNAQE.

To all whom' it may concern.'

Be it knownthatl, ARTHUR W. CHASE, a

citizen of the lUnited States, residing at New York, in the county ofv New York `and State of New York, have invented certain new and useful Improvements. in Roasting-Furnaces;

and I do hereby declarethe following to be a full, clear, andexact description of the invention, such as will enableV others skilled in the art to which it the same. j

My invention relates tov improvements` in roasting-furnaces, although'itmay also Abe used as a dryiig, chloridizing, and calcining furnace as well.

appertains to make and use The objects of my invention are to producea furnace of greater eiciency than the fur- 2 5 atory furnace with sli ht changes in construcf tion, and one thatwi l variety'of ores. L

'y .tions of nace, now in common use' forroasting 'purposes', one that may be operated at a' lower l cost and at a minimum expense for repairs.

Further objects are to produce a furnace in which the ore may be roasted toa dead roast or to `a roast sufficientfor smelting purposes, as may bey desired, one that may be used. either as a mufflefurnace o'r a reverbereflciently reas/ t every With these objects in view my --invention consists lin the construction and combinaparts,l as hereinafter'described and claimed. A

In the-accompanying drawings, Figure l is a longitudinal section. of my improved furnace, parts beingremoved. Fig. 2 is an end view,partly in cross-section, of two of Amy furnaces built si'de by side. j Fig. 3 is a side view of my'improved furnacefa part being shown in cross-section to show the construction of the flues. Fig. 4; is a horizontal section taken on the line 4 .4 of Fi 2. Fig. 5 is a horizontal ysection of two o my furnaces built side by. side, Athe ls ection of oner furnace being takenon thefline A'A, Fig` 1, andthe section of the other furnace being taken on the line B B of the same figure. Fig. 6 1s a vertical section, on an enlargedscale, ofthe feeding part of my device, which may also be used as a drier. This figure'is taken looking from the opposite .side of "said feeder from whatis shown in Fig. 1, and'Fig. 7 is an end view of two of my furnaces built side by side vand showing in dotted lines the means for driving" y the` conveyers and the supportingframeforthe masonry structure. My improved furnace is composed of units,

specification of Letters Patent.

ipplication filed July l, 1903. Serial No. 163,919.

Patented June 12,1906.

although-for convenience I usuallybuild at least two of these furnaces side by side, making use of one chimney for both furnaces. I do not restrict. myself to this arrangement,

however, as my furnace `can be built Aas large each unit being a complete furnace in itself, l

as desired by combining any number of units i together arranged side by side. a represents a hopperof metal which is supported, by, means of braces 6, directl upon the brickwork of the furnace..y This hopper delivers into the top of the throat c of Y .the combined feeder and drier, an iron collar d beingV preferably used at ,the point where the hopper and the throat meet.- The throat c delivers into a cylindrical chamber e, which is provided with a discharge throat or pipe f. The parts c, e, and f are made of a single piece of cast-iron, insuringv great strength and rigidity. The ends of the cylindrical chamber e are closed bylend pieces g and 71 being secured thereto by bolts (not shown) or in-any,

other suitable way. These end pieces g andh mineral wool, or other suitable heat-resistingl repre-. sent end pieces for the purpose of hol in thev anddust-catching material. o and packing in place, these being perforate for the y passage of 'the conveyer-,shaft These end pieces may be extended, as shown at g in Fig. 6, for the sake of giving an additional extended bearing to the conveyer-shaft, or'

they may be simple plates, 'as shown on the left of Fig. 6. They are'securedt'o the parte gland h by bolts (not shown) or in any other suitable way.

Within the chambere is a conveyer consisting of a shaft r, upon which is mounted a 'Spiral conveyer s. This spiral conveyer is made up of sections, as shown in Fig. 6, any fone of which maybe easily removed for repairs. The conveyer-shaft r is hollow and is cooled by water passing through it', .the water being delivered at one end thereofand'passing out at the other, as clearl 'shown in Fi 1. The shaft r is providedy with suitab e 'stuffing-boxes u, oneat each end, and screwthreaded projections@ are provided, to which flexible'pipes wand (see Fig. 1) -maybe IIO cated the brickarch t, ,(see Eig-2,)

a-recess in-the end wa l yof the furnace .fand r` .ofthe-unit furnaces for :the purpose ofrescrewed. The wholel feeding -device islloresting on the top of the furnace. The discharge-pipe f passes down into. a.ver.tica1ly arranged pipe y, which delivers into the top ofthe'upper roastin -trough z. w. y

l'""r[`hepipe y, as wel ,as the roasting-troughs, 1s ma e of` carefully-Selectedv and p .-clay.V .Said pipe ispi'ovided at lts upper end with a projectlng li 1, which enter'sinto also rests-upon the brick -arch 2,- 'whichds sprung across between theside walls-of the v .furnace The lower' end of the .pipe g/fits into a perforated -ire-cla platev 3,. whichisy l providedwith a lip 4, W 'ch surrounds-the pipe y on threesides. The Iplate 3 rests upon j .Iss

1.- and-.is supported by the trough 2. lThe trough z, as. Well. as the other .roasting- -tioughsfis substantially but noteXactlyU` shaped.in:crosssection-fthatis, ithas a circularfbottorn; but the sides thereof are .not vertical,.:but are splayed outwardly, thereby screw conveyer ymeans yof theadjustable bearin sito .give the screw greater clearance venabling. the ogerator by.- .ralsing any,4 yone z5 from .t e .bottomand sidesrof the trough i -should defects in the form ofthe -trough due.

to...defective manufacturing ycause the screw torbind. v Within the trough z isa spiral conveyer 6,

'L .carriedon the hollow shaft-Which is provided with stuffing-boxes-and cooled by a current of. water flowing through .Saidshaftf as has 455 :already .been .describedl in connection with the conveyer-shaft of the feeder. 'All fouro'f the conveyer-shaftslare ofgsimilar-rconstruc- .tion and, together with the feeder`shaft,.are

supported in bearings carried-on independent `supports 7 .and 8, arrangedoutside of th'e'furVF .naceyso as to be substantially free -fromyth Y v.expansion and contraction that would ensue' 1f they were directly attached to the'walls of the furnace. .In Fig. 6 is shown .one form-.of

a dust-excluding.. bearing,which :has already lbeen described; but I prefer to. use; in addltionto 'said bearing a secondbearing. 9 out'- side :of .the mainA ,bearing and .preferably 1 yslightly. smaller, 'whichbearing is filled with Waste 1()y adaptedto besaturatedl with, oil. eln Fig. l all. the; shaftsare shown as provided with this double bearing. The...orefroasting 'troughs'.are made. of carefully-selected fire'- cla ,and the entire interior iszmade of care.- ful y-seleeteddirebrick and fire-clay. forms. The outer Walls may be eitherplain .brick or. fire-brick, as preferred.

. ,Below the. series of roasting-troughs which are arranged in vertical series .one above: the otheris a shelf 14, whichfseparates the .fireboX from the roastingrtroug-hs. Asimilar shelf 15 .is provided above-the-.toproastingtroughs z, and by means of these. shelves. the ire and products of combustioniareykeptsentirely apart.. from the roasting-troughathus.

prepared f in -troughsl ceases products of combustion therefrom pass up 'through the iues 16 and 17;'located at op o- .site-corners of the front of the furnace. T ey then pass over the shelf. 15 through the passage 18 vand out through the chimney 19.

' The passage 20v (shown in Fig.. l) is a passage connecting the top passage or iiue of one furnace with that of-a similar furnace next in line and ma Abe vclosed by a .damper or briched up w 'en itis desired to cutout one .pairs, .for example. On the. shelf 14 rest fireclay..archesc 23,`.made.1f of .fire-.clay and on ywh1ch--the..lowest roastingftrough I13 rests.

Onthe. .braces 23 are. fire-.clay 4blocks 24 .and '25,. which. support aseries of fire-clay arches 26,.. which.. support the roasting-trough .12, and'this construction is continued. all ..the wayup ,thefurnace l The spiral conveyers infthe various roast- ;.ing-troughs are .revolved in opposite directions successively, so that the o re is fed for- 'ward through one, back through the nekt lower'trough,A forward through the next lower trough,l and soon. At. theend of each trough are dischargapipes 27, 28., 29,.and 3Q made :of're-clay. All `of these lexcept the .lowest one .are similarinconstruction and 95 each consists of a pipe provided with an outwardlyfprojecting `lip entering a recess in the wall of the furnace and being cut away above to fit around the trough just above itand beling cut away below to fit-upon a ledge in the supporting- plates 31, 32, and 33, which rest upon the troughs 11, 12, and 13, respectively. `Below the shelf 14 is the fire-box 34, pro-- Avided with a grate 35`and a charging-door-S.

Beneaththe ate 35 is an ash-pit 37, provided with a ischarging-door 38. Adjacenty tothe grate 35 isan inclined floor 39, and this `floor .Br plate 39 and the bottom ofthe ash- IOO IOS

ypit are made 'of Vfire-clay, though they may be made of other vmaterial in s ecial cases. The

`bottom 'of the ash-.pit .an the plate 39 are supported in the side walls ofthe furnace, and .the bottom of the furnace 40 rests upon a .concrete foundation 41, which affords a firm and stable base to the whole structure. A

.shortndistance .above the vbottom 40 of the .furnaceis an-firon .plate .42, separated lfrom -thebottomand oneendl ofthe furnace by a IIS I -de iver .airftothe lowest trough 13. The

paired- fines 48, 49', and 50 deliver' air above the roastingftrough 11, and thepaired flues 51..'andg52'deliver air above the roasting# ntrough z. Of course it is-understood that paired ues..are 'provided for veach :of said roasting-troughs, but -to avoid confusion said troughs should happen to b ecome crackedor broken.

Peep-holes are provided at various places in the sides of the furnace. One of these is shownat 53 in 2 and is adapted tofbe closed by a brick 54. These peep-holes are preferably-arranged so that each 'trough may be separately inspected-that is to say, .peepholes are provided just above each trough v and just above the-shelf`15.

ing .up the flues 16 andslgrj The flame and vproducts'of combustion from the fire-box will thenV rise directly around the roastingtroughs and pass out thrgugh the chimney 19.

Any desiredmeans Til? heat may be used in the fire-box, whether wood; coal, or gasf In manyl instances after the ore has once become hot the heat generated by the combustion of the ore itself is su'liicient to maintain the roasting operation until it has been completed.

In the type of furnace shown in Fig. 1 the gases evolved from the roasted ore for the purpose of making sulfuric acid are shown as passing outthrough discharge-pipe 55, which is located underneath the lowest .trough 13.

i It should be noted that the space beneath the arch t is subjected tothe action of the hot gases evolved from the roasted ore, inasmuch as'said gases can pass freely through the pipe y up into the space beneath said arch. These hot gases, which play around the tube aand the pipes c andf, heat them to a considerable degree, thus rendering the pipe e a drier. .'The conveyer s prevents any `appreciable 'amount of said gases from escaping up through the pipe c out through Athe open hopper a, and this is especially the case whenas is-usual in actual voperation the pipe c is filled with ore. The hot gases from' the roasted ore come up through the pipe 'y and surround theftube e; and heat it, thereby becoming cool when they fall back through the pi-pe y into th'e main portion of the furnace.

In muffle-roasting,generally speaking, the

`gases arising from the -burmng or chemical changes in the orepass out through the pipe -y and over and around the feeding and dry- 'ing device and thence 1to the chambers or flues through' an opening back of the heating from the spirit of my invention but device through a passage, (not shown on the drawings,) thereby utilizing the heat of'these gases to dryfand heat the incoming ore. The drying-chamber thus becomes a very efficient dust-chamber. I

It vis important thatv the conveyer-shafts 'which pass through the roasting-troughs should not become warped or bent by the heating and cooling 4ofthe furnace. This is accomplished, as has already been described, by having these shafts water-cooled and by having the bearings therefor mounted in supports entirely separated from the furnace proper. f

The ends of the furnace are providedwith openings which are closed by plates 79. These plates have circular openings cut in them a little larger than the conveyer-shafts. Angle-irons 56 and57 are secured to these plates 79 and to the end. of the furnaceby bolts 80, which pass through said plates and into the wall of thefurnace. Between these angle-irons and the side of the furnace separate plates, such as 5S, 59, and 60,. are secured, and these plates are cutaway at their meeting edges for the passage of the conveyershaft-that is to say, each of the plates, which fit around the conveyer-shafts are made two sections which are adjustably secured togetherby plates, such as 61, secured by bolts 81, the holes through which said bolts S1 pass being larger than the bolts themselves, so that an ,exact adjustment may be obtained. The stuffing-boxes pass into the plates 61. In this way the conveyershafts are practically entirely independent of the closing-plates, which are free to expand or-contract under the heating-and cooling of course occurs on both ends of the furnace.

Tie-bolts such as 75, 76, and 78 pass through the walls of the furnace. The supporting-frame for the driving- gear 63, 64, 65, 66, 67, 68, and'69 is shown in'Fig. 7.

The conveyer-shafts in the various roasting-troughs are arranged to travel at different rates of speeding, increasing from the IOO vthe furnace. This'arrangement of plates of IIO top downward, the conveyer in the top roasting trough moving the slowest, 'while the conveyer in the lowest roasting-trough moves the fastest. This is desirable .in order to prevent any possible clogging of the ore in the roasting-trough, and is es ecially desirable in order to lessen the dept 1 of ore in the successive troughs, and thereby increase the roasting-surfaces exposed to action. This is accomplished byfhaving the sprockets u on the conveyer-shaft of different sizes, an in Fig. 7 are shown in dotted lines sprocketdrives for accomplishing this result.

While I have thus described my invention,

I' do not wish to be limited to the exact details shown and described, inasmuch as many of them mighty be varied without departing What I claim as. new, and desire to secureby: Letters Patent of the UnitedStates, is-

'flfIn a roasting-furnace, the combination of end walls provided with openings, bridgel f l"Walls, a series of substantially U-sha'ped troughs supported within said end walls, con-,

veyers in saidl troughs, means for driving said conveyers; afplate provided with circular openings adapted to lit around theopenings in the end walls, said plate being prov i ed with slots and'removableplates each l made in two sections fitting around the conveyer-shafts and adapted to close the openings in the endwalls, said plates being adjustably secured to .the first-named plate, substantially as described.

2. In a roasting-furnace, the combination of the furnace roper, a metallic ho-pier sup.

ported on sai furnace, a .combine feeder and d-rler provided wlth flange resting` on said furnace, a conve erln said feeder and drier, a watencooled s aft for said conveyer,

' and gas-check devices, said hopper and the [iron feeder and drier bein of roasting-troughs arranged one above the able shelves' where? used either as a mu other, conveyers in saidtroughs, and remov said furnace may be e-furnace or asa rever beratory furnace, substantially as described. 4. In a roasting-furnace, the combination g of end walls, sidewalls, roasting-troughs sup orted between said walls, removable shelves i ocated one above said roasting-troughs and 4o one below the same, thereby shielding said trou hs from direct contactwith the heatsupp ying means, and means for delivering a1r to said roasting-troughs, substantially as described.

` 5. Ina roasting-furnace, the lcombination of end walls, side walls, roasting-troughs secured between saidwalls, a fire-box, removable-shelves,l one located above said roastingtroughs and one below the same, means for 'conveying the flame and products of combustion from said nre-box around' said roastingtroughs, and means'for su plying air to said A troughs, substantially as ascribed.

6. In a'roasting-furnace, the combination of end walls, side w-alls, roasting-troughs sup ported between said walls, a fire-boX, removable 'shelves above and below said' troughs, 4means for supplyi'I-ig vair to said drier located aboveone of said roastingtrbughs, substantially as described.

7. In a roastin -furnae, the combination of end walls, si e walls, roasting-troughs therein, a conveyer in eachof said'` troughs, shelves located one above said troughs and the other below the same thereby shielding said troughs from the direct action of the heating means, a combined feeder and drier for said troughs, said feeder and drier being shielded from the direct action of the heating means but being exposed to the action ofthe heated gases evolved from the roasting ore, and means for carrying off said gases, substantially as described. 8. In a roasting-furnace, the vcombination of end walls, side walls, a fire-box, a shelf located directlyabove said iire-box, roastingtroughsllocated above said shelf, a conveyer in each of said roasting-troughs,dischargepip-es for said roasting-troughs, a shelf cated above said roasting-troughs, said shelves serving to shield said roastingtroughs from the direct action of the heating means, means for delivering air to said roasting-troughs, and means forcarrying the products of combustionv from the fire-boxaround said troughs,- substantially as def scribed.

In testimony whereof I aiiix my signature in presence of two witnesses. Y

. ARTHUR W. CHASE. Witnesses:

J. STEPHEN EINsTA, FRED W. ENGLERT.

.roasting-troughs, and a combined feeder and

Images