US1127264A - Smelting-furnace. - Google Patents

Description

E. V. LANYON s P. A. CURNOW.

saremmo Pommes. APPLICATION FILED APB.. 11, 1914- Patented Feb. 2, 1915.

5 BEEETS-SHEBT 1.

E. V. LANYON P. A. GURNOW. SMELTING FUBNAGE.

APPLIUATION FILED M1111, 1914.

1,127,264. Patented Feb. 2, 1915.

s saura-snm a.

www Tozzi;

' E. Y., LANYON & F. A. CURNQW.

SH'ELTING FURNAGE. APPLIGA'HON FILED APBu, 1914. 1,127,264. Patented Feb. 2, 1915.

5 SHEETS-SHEET s.

B. V. LANYON & P. A. CURNOW.

SMELTING FURNAE.

APPLIQATION FILED APR.11,1914.

1, 127,264. Patented Feb. 2, 1915.

N N 5 SHEBTSSFEET 4. R R i Y E. V. LNYN a F. A. CURNOW.

SMELTING PURNACLI, immun-10N Mum APR. i1, mi

Patented Feb. 9, 1915.

b SHEETS Sh LT 5` www' ELT CUR-NOW, GF PFITSBURG, KANSAS.

a Saaie-agee@ 'f'lo @35 whom if, may conce-'rn y M "Be it known that `we, rlnwit VINCENT LANYor and Fuaio'is ifilasnnr CUjaNoW, oiti- :Lens ofthe `United States Vof America, residing-at Pittsburg, Crawford county, Kansas, have invented 'certain new and useful Improvements in Smelting-Furnaoes and g we .do-hereby declare the following to be a f-iill,"olear, and exact description of the inm' '-`v'eifi tio n, vsuch as will enable others skilled 'in the aitte'wfllfh itappertains to make and 7 use the same.

'-This invention relates vto furnaces for ore-or other nietallilerous materials, and has spe. ialreference 'to spelter in rnaees' 'or furnacesfor reducing zinc ores,

' mi' furnaces-for the reduction of; @than ma- ,The said invention has been Idesigned 'inv pantiulaiy to increase the eiciienlfzy and 'out- Q-prit.;` what isknovgnin the art gin eine furnace, thatis to say, a furnace 'wliiclrtheretorts of elongated'form -'-st cl ed-in tlie furnace.chamber in superinmore unless approximately 'horizonv Ctalfrows ortiers. f T

vim ,naeesfhas been -to a great 'extent superseded ..T byiurxmoes4 adapted to' be operated With "feh'e'ap fuel, such as natural gas, and by more inodeinftyiiies of urnaqes adapted to be fired.

;v'ith producer whichvfurnaces have.

"elabiir'requiredr and adapted to` give a steady I and. uniform heat throughout' 'the fire-space,-

such as z' could ,not fbe obtained under' `the Qld 'forii'fls fof.: Belgian -furnacesQTliereby tref spelter furnac i lon,

Eines?, as 'will be' vreadily appreciated,-

Specification of Letters Patent.

' .lippleatioii filed April 11, i914." Serial No. 831,148.

Inf recent yearsjtbe Belgian typeof' fur- Patented Feb; 2, 1915.

parte hereinbelow described and, more particularly pointed out in theclailns.

ln the accompanying drawings ive .have represeiited, in illustration'of our invention, a zinc or spelter furnace Which-nie consider the preferred embodiment of said" invention.

. n these drawings-*Figure vl, represents a Yertical transverse section, on' "line 1-1, Figs. and 4, of a Belgian sineltingiurnace embodying our invention; Fig 2, a vsidet ele- 66 vation partially in vertical sectionof the same, looking toward furnace ronithe end opposite to that from which Fig. 1 is taken; Fig. 3, a side elevationof thesaine, partially in vertical longitudinal section on line E 3, lligs.v 1 and fl; 4, a sectional plan thermif, on line 1 /l, Figs. 1 and 2 5.; Figa 5, a top plan View thereof Eig. B-taiertioal section thereof on line 1 showing the air blast pipe arrangerneritfllig;i7, an endfelevation v showing said air-blast pipe arrangement, and lookingin tliesarne direction as for Fig. 1,11`ig. 8, a side lvation at oneiend of the furnace a' ydetail sectional View on line 9 9 Fig- 1 and Fig. l1,-and Figs. l() and 11 a detail'frontand a detail `side elevation .of the cliute'dooi.'

I f In all off the figures the Asame,,parts Vare designated by the sameYreference.characters. s. shown in this dra-Wing, the s inelting furnace 'comprises two-retort heating Lcharnlbers A Afdesigned for receivingtliensual or` any suitable number of retorts of any well-known or suitablev arrangement and 4construction in 'the art ofreducing metalliferous material containing zinc, 'orother similar metal or metal which may be distilled in retorts, said retorts being arranged in the usual manner in superi'mpos'ed tiers.

The chambers A et are separatedl by a continuous partition-'Wall-B 'of'suitablethiekness and strength,r said partition-Wall rising from the foundation Wall Bf, butstopping short of the arch-roof-, -G of the furnace 4and being separated`- therefrom suliciently to lo@ vvleave a continuous'unbroken throatbrcommun-ioation a between the. Chainbers A and AC as shown. i The retorts a,..aresupport ed yinv an approximately horizontal ore somewhat inclined position on ledges .b at their I Olj rear -and on supporting, platesdjofthe usual or any suitable, forni ;andf'onstrution at mounted onA buckstaveS-D rising ltained in position so as to occupy a Vertical position and to support the front walls by the usual tie-rods, d'. For further bracing the furnace, encircling braces or hoops d2, arranged as shown in Figs. l, 3 and 7, are provided, said braces or hoops surrounding the entire furnace, inclusive of the buckstaves, D.

The furnace is so arranged that hot gases of .combustion in a partially burnt or consumed condition are delivered to the heating" chamber A at its bottom, said gases passing in the direction of the arrows l upward through chamber A, through the throat or communication a' and thence downward through the chamber A', said gases being mingled, as they emerge from the throat a', and within the chamber A', with air for the purpose of more perfect combustion vand raising their temperature to that required in the chamber A. In the furnace shown in the drawings the heating gases are produced in the hearths or fire boxes E E arranged below the heating chamber A at each end of the furnace, said fire boxes and gas producers being provided at the bottom with water-cooled grate-bars e, e, and fire-stoking openings provided with doors e e', one arranged for each of the said fire boxes. The fire boxes are separated by a fire back e" A lia'ving sloping faces e12 as shown in Fig. 9.

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For delivering the air to be mingled with the gasesof combustion and also for supporting the combustion in-the fire box, the

furnace is provided with anl air-blast sys-I tem Whose arrangement and disposition will best be understood from an inspection of Figs. -5 to 8. This air-blast system comprises a main-pipe F arranged to receive air from .a fan or other air-forcing or air-compressing source, said main-pipe Aextending along one end of the furnace and in suflicient proximity to its walls to receive heat radiating therefrom. Communicating with the main- A,pipe F and running longitudinally over the top of the furnaces at an intermediate part of the same is arranged the horizontal feedpipe F', (see particularly. Figs. 5 and 6). Another feed-pipe F2, also communicating with the'main-pipe F, descends vertically in front4 of one end of the furnace, (Figs 6, 7 and 8) said vertical feed-pipe branching off .near the bottom to form Vtwo branch pipes f f2', vone of these' branch-pipes f being con-` nected. tothe masonry of the. furnace beneath one grate e so as to feed the air thereto, as shown in Figsl and "I, while the other, f2, passes longitudinally and .horizontally beneath the smoke-tunnel H (Figs. l, 5 and 6) and through the furnace, by way of the residue-chamber J', belowr described, .and v thence in front ofthe farther end of the furnace, its end being connected to the furnace-wall beneath the other grat-e c so as to lfeed air thereto, (Figs. 2 and 5). The vertical' v which extend the branch pipes f5 f5 Which communicate with said vertical arm f. Tlie branch pipes f3 and f5 serve to deliver the air from the main blast-pipe to the heatingchamber A', and for this purpose the partition wall B is constructed and arranged in the following manner: The said partition wall B consists of an interior portion b and of a lining built up of the ledgeblocks. b

and the intermediate blocks b2. These lining or coating blocks b4 and b2 are made of heat refractory material such as fire-brick, as are all the other parts o'f the masonry and inclosure of the furnace exposed to the action of the heating gases, such as the arched roof C, the fire-box E and the other masonr of the chambers, A and A'. In the body o the' interior portion b of the partition 'wall BA is'arranged a series of horizontal iues b3 b b3, etc., (see Figs. 1 and 6) which flues extend horizontally through the furnace, as best-shown in Fig. 6, where it will be seen. that each of these flues pierces also one of the end walls, B2 and B3 of said furnace in alternate order, so as to communicate alter--- nately, 4with one of the branch pipesfa, 'f5 at' g the'two ends of the furnace, of'which branch pipes said flues b3, b3, etc., constitute con- I tinuations. From Figs. 1 and 6 it will be seen that these flues b3 b3, etc., communicate with the heating chamber A' by orifices -b b b, etc., said orifices passmg through the terior portion `b of the partition wall fromthe flues b3 and through the-,lining blocks b2 as best seen in Fig.,1. As shown in-Fig. ,6, these orifices are preferably staggered in ai-,

rangement so as to provide for as uniform as possible a distribution of the air to the. chamber A'. From an inspection of Fig. l

it will be noted that the portion b5 of these following arrangement is provided: Referring to Figs.`2, 5 'and 6, it will be noted that the horizontal feed-piped?" 1s tapped at an intermediate portion of its length, a branch pipe f being connected at this point to said feed-pipe, said branch pipe f6 leading to a longitudinal air-chamber or trough c runvblown outggand lremoved from the retorts,

Al l i 1 1 Y i c tniougu which streams oi air flou dorn 'oil into the chamber A" along the outer inclosing wall thereof. For regulating the amount of air to be delivered to the lues ai t i chamber c, and under tlux grates e c. thc 1Ainch-pipes f and fl, ,f3 and f5. and are provided with valves or dempers fr", f, f. and im. respectively.

.To arry el? the heating gases and vapors after passing downward through the heating chamber A', said chamber communicates with the stacks or chimneys, G, G. by a smokelue or tunnel H extending longitudinally through the furnace, beneath the chamber il and connecting the two stacks as best shown in Figs. l, 3, 4 and 5, the arch il. over said tunnel being provided at suitable intervals with slots or perforations h of sufficient size to permitl of the ready passage therethrough. of the gases and vapors of combustion from the chamber A to said tunnel. By re Y ring particularly to Figs. l and 3 it will be seen that, for a purpose to be hereinafter stated, a second c'omirnunica` tion to the stacks from the chamber A. is established by openings or ports la? f1.2 openA ing into the short limssages 71.3 Il? leading to the interior of the stacks G G. Both these openings and the extreme ends of the tunnel l-l are provided with dampers it* h4 and /1-5 li", respectively7 made of suitable material, such as lire refractory brick, and preferably they are made in the shape of sliding dampers. As shown. in Figs. Q., 3 and 4, the ends of the tunnelffl are provided with doors k6 71,6, which may be opened for giving access-to the saidtunnel for cleaning the same orlfor other purposes, and which are adapted to be tightly closed when the gases and vapors are passing through the tunnel. The stacks or chimneys "Gr G are provided opposite the passages h3 k3 with openings g g which permit access tothe said passages and which are normally lclosed by masonry or by luting in any suitable or convenicntway.

Asshown'. the tunnel H and thev doors h6 h are, in the example given inthe drawings, below the floor-line. while the openings h2 andA passages h3 are above -the said line.

The working floor at bothl s1des'ofthe furnaceis provided with openings y j, etc., placed at suitable interralsuapart and 1n close proximit)v to the sidefwalls, as seen best lin- Figs. 1 and 4,- said openings leading to.

theehutes i"j, for the reception of the ashes and r'esiduesthatare periodically raked or said .residues-passing downthrough `the 'chutes jv into the residue chambers J J. which :extend longitudinally under thel gratos ele .and the tunnel H.' The chutes y" j' are closed at the bottom by any Suitable doors, such for example as the doi jf, jg, shown in lFigs. l, l() and il, which are provided with latches j, j, as shown, to hold the residues in the chutes and prevent their dropping out until the residue-removal cars are in position under the chutes. to hold the Y under the grates and prevent air-drafts through the chutes. llhen these doors are opened. they allow the residue mater-l to pass down and to be discharg u in the chambers J d', for 1e. 'val After the removal of the residues, the doors are again closed and thus prevent the suppression of the blast and also the access of airdrafts through the chutes j', which might chill the outer walls or fronts of the furnace by delivering to the same cold air. In order to permit the gases from the residues to escape into the residue chambers instead of backin'g up to the working floor, the doors .of the chutes leading to the chamber J' may be arranged so as not to close the chutes entirely but to leave a small opening j:3 at the top as shown in Figs. 1, 10 and l1. The doors jg for the other residue chamber J are similarly arranged except that they entirely close the chutes, leaving no opening at the top. Below the grates e e'is arranged means for feeding steam or 'water to the fires, such as a perforated steam pipe or watersprayer4 c2', Fig. 1.

The residue chamber J is provided at each end of the furnace with a door to permit access to the same for cleaning out the residues from the retorts and the ashes and clinkers from the lire-box grates at each end, and for other purposes. As the opening of said doors would result in sending a stream of cold air into the lires and thus interfere with the blast from the air-pipes 7" and f2, and otherwise with the operation of the furnace, we provide movable means for closing the fire-place E against such drafts or interference with the blast while said doors. js are open for cleaning out the chamber J. In the example shown in the drawings these means consist in two hori zontal sliding doors K, K, shown in Figs. l and arranged below. the gratos e e, guided in the masonry of the furnace and resting on anti-friction rollers la. .At each cud. the doors K5 K, are provided with cords. cables. or chains lc" k2, running over loose pulleys lf3 at the'interior of the chamber .l and loose pulleys le* .outside of said clam er. said cords being provided with weights at their inner ends.. and 4weights ai' ,their outer ends. all as shown in Fig. t?. Scraper bars liz?. k/sere to renmre ashes and clinlwrs which may have dropped on the (lool-strom the gratos. as the said doors are drawn out! ward into their open position.

From" the above description the operation of the furnace will be readilyV understood.'4

retorts a, being charged in the usual s with th'e metalliferous material, such ore or other zinc bearing material, ith the proper quantity of coke or any n coke or coal-mixture and the fires in operation in the 'fire-boxes or 'gas eers E, the gases and products of com- -therefrom pass through the retort- Y chamber A in the direction of the i, around the said retorts, said gases L ssing through the throat a and deg down through the retort chamber re these gases are met by the currents -ss'uing through the perforations b4, inner Wall of the said chamber A in traction of the arrows 2, and from the tions c in the direction of the arrow u he gases-then pass through the slots h into tunnel Hthrough which they pass tl e directicm-fofl arrows 4 to the stacks anddnto thfian By suitably adjusti Jes-fandf?? the amount of air adfunden the grates e can'be regulated necessary extent to support the proper ,e of combustion, the proper amount of amforfwatenspray.for this purpose being o introd.iif''e'dr underA the grates by means of e 'perfora'ted steam or Water-pipe e2. By

r reducing the air both from the orifices b* the ducts c,`the products of combustion ises as they enter through the throat a iroperly and uniformly mixed so as ecizre'a uniform degree of heat, both at and inner "wall and in the interior amber A. The supply of air to Ms 3, with which the orifices b4 comsininicate, and to the air-chamber c leading to the perfor-ations c', is regulated by the dempers on the one hand, and the damper f6 on the other.

inders from the fire-boxes E, as they drop, Ae'colleoted in the chamber J, and the resi- Qrines from the retorts a, as they are raked chutes j Iand when the doors y2 are ned, they pass into both the chamber J the chamber J. Then it becomes necsary to clean out the smoke tunnel H, the or perforations h in the arch h, (see i and 3) are closed With irebrick, and dampers la* are opened so as to permit chambre n. to communicate throughthe ge )3,3 1sith the stacks G. Thereupon 'tunnel li may be cleaned out Without in- 'pting the operation of the furnace, adon to said tunnels being permitted by ing the doors h he. In order to evacuhe chamber J Without interfering with last under the grates orY admitting cold vom the exterior to the fire in the fireand thereby chilling the same and chambers A when the doors js are open, the horizontal doors K Kgwhich', in

.f normal operation of the furnace, are ravin out in the dotted position indicated The ashes and' or blown out prior to replenishing, drop into y in Fig. 3, are drawn inward to the full extent as indicated in full lines in said Fig. 3, thereby closing off the fires and thechambers A A against the outer lair and forming la secondary blast chamber. The residues,

ashes land elinkers can then be removed from the chamber J. As soon as `this is done the doors j are closed and the horizontal doors K K are returned to their outermost positions as indicated in dotted lines. As the residue chamber J is permanently closed off against the heating chamber A it may be cleaned out at any time Without interfering with the blast or the operation of the furnace.

Our improvements as above described may be applied to the old type of Belgian furnaces, or they may be embodied in entirely nevv Belgian furnace structures.

A; furnace embodying or having applied to it our improvements not only saves fuel and labor, but leads to a better yield or re` covery of metal from the. ores or other metalliferous material treated, by reason of the uniform heat which it enables us to apply continuously to all of the retorts throughout the heating chambers, the lovvermost retorts in the first chamber receiving substantially the same amount of heat as the uppermost retorts therein, or the lovvermost retorts in the secondchaml'ier, and the number of re-` torts in the chambers or the capacity of said chambers may be increased or vdiminished Without modifying this uniformity of heat.

ln the old form of Belgian furnace the .fires depended to a material extent on the stack pull or draft of the chimneys and the building of heavy fires which have a tendency to cool the furnace for a time, to be followed by the danger of excessively heating the furnace after the green fires have burnt down, such excessive heating being greatest near the fire-box, the heating of the -various retorts being moreover very uneven throughout the heating chambers, either the lowermost retorts being excessively and injuriously heated, or the'h-eating of the retorts remote from the fire being inadequate. On the other hand, in a furnace arranged and constructed under our invention, involving the delivery of a preheated blast to the grate'and to the'gases of combustion. at the points Where a lowering of their temperature is likely to occur and to the fires themselves, and also means for controlling such. blast delivery at the different points, full and small fires canv be employed continuously. 'By this arrangement it is also possible to prolongthe life of the furnace'by preserving the fire-brick linings against damage-"since .l exposed to thel intense heats due to holes burning. into the fire. A considerable source of economy also resides vin thel fact'that'the they 'are not said second heating at the autor portion iyhich-hayehad a .of the former, notwithstanding the advanfrom the furnace, and also in` the arrangement, in 'addition to the tunnel H, of the means for establishing communication beth vstacks G, G and the heating chamber Af a ove said tunnel, when said tunnel is'being cleaned, and ofthe horizontal doors K, K which permit the residue and ash chamber J to ,be closedoii' from the fires bones E, E, when cleaning out sai cham- Thereby nointerrnption in the working (if the furnace is necessitated by those operations. In fact the eiiiciency and outut of' the coal-tired Belgian furnacehas n so materially increased by our improvementsas to place a. new value on this type of Viurnaces, end to adapt,i t to suc eessiully compete with spelter plants employing gas and cheap fuel, and furnaces of odern construction. used in connection "with gas-prodncers of various, descriptions, tendency to take the place txgesinherentwin the samelk While particu arly adapted to such yBelgian furnaces, our;unprovenv singly or in Vthe aggregate, may be with advantage employed in other furnaces for smelting and treating ,uetalliierous material.. The grates emoioycd may be of various descriptions, in the l''rm stationary or shaker grates. However, theform shown and described above, weind the most suitable in connec tion with the other parte as shown.

What we claim and flrsre to secure bv Letters-Patent is z L ln a smelting furnace, a ypair ol't heating chambers, communicating with each other at theirl tops, m/eans for delivering heatingA gasesfat the lower part of one heat chamber and means for carrying-ofi the gases from the other heating chamber in combination with a partition wall between the chambers, saidfrpartition wall being provided with aiiiiues and openings leading from the i same into the second heating chamber along the surface of said wall, and an air-chamber arranged. at the top of the said second heating chamber substantially lat the outer portion thereof and arranged to deliver air to said chamber at the outer portion of said chamber.

2. In a smelting furnace, a pair of heat^ chambers, communicz-iting other at their tops, means for delivering heating gases at the lower part ci one heating chamber and means forcarxjvngot't the gases from the other heating einher, in combination with a prf tion f between the chambers, said partition-wad being vided with air-lines and openings leVL from the same into the second vhefin,if3 chamber along the surface of said wall, and an air-chamber arranged 'at the top orf the thereof', said air chow with each f chamber substantially ber. being provided with downwardly directed air outlets substantially along the outer wall of said chamber.

V 3. In a smelting furnace, a pair of heatin chambers, communicating with each ot er at their tops, means for delivering heating gases at the lower part of one heating chamber and means for carrying-off the gases from the other heating chamber in combination with a partition wall between the chambers, said partition wall being provided with air-fines and openings leading from the same into the second heating chamber along the surface of said wall, and a longitudinal air-chamber extending along the roof and the outer portion of the said second chamber and provided with downwardly directed air outlets along the inner face of the outer wall of said second chamber. c

4. Ina smelting furnace, a pair of retort heating chambers communicating with each other at their tops, a fire-box at the bottom of one heating chamber and means for carryingr lofi' the gases second heating chamber, in combination with an exterior air-pipe system arranged in heating proximity to the furnace and provided with branch pi es for delivering air under the fire-box andp to the inner sides and the top of the second heating chamber. l5. In a smelting furnace, a heating chamber, a stack or chimney, and a communicating passage connecting the chimney with the heating chamber, in combination with a second communicating the chimney and the heating chamber arranged above the first communicating passage, and means for interchangeably closing or opening the opening or openings leading from the heating chamber to the'first or second communicating passage.

6. In a smelting furnace, a {ire-boxy and a chamber for collectingashes, residues and cinders, arranged below said fire-box and providedwith a door to'give .access thereto, in combination with means for cutting off the communication between saidv chamber and the fire-box, chamber is opened. f

7. In a smelting furnace, a fire-box and a chamber. arranged below the fire-boi:1 -for collecting ashes, residues and cinders, said chamberbeing normally closed against access of air and provided with a door, in combination with a horizontal door arranged below the iire-box, and means for opening or closing said door, asthe chamber below the fire-box is closed or opened respectively,-

8. In a smeltin furnace, a iire-boX and a chamber for col ecting ashes, residues andz from the bottom ofthe' passage between when theu door of the l iio and to produce pressure .below .no

the fire-box, and chutes leading fromthe -working fioor at the front of "into the chamber and provided with doors at their bottom, in combination with means for cutting off the communication between said #chamber and the door of the chamber is opened.

9.In a smelting furnace, a pair of heat ing 'chambers communicatingr .with each other at their tops, means for delivering heating gases at the lovver part of one heat ing chamber and'means for carrying ori the gases from the other heating chamber at the bottom thereof, in combination with a partition-Wall between the chambers. said partition Wall being arranged with longitudinal air-'iiues and openings leading from the same into a second heating chamber along theIv surface of said wall, a pipe for delivering air to said air-lines, and connec ing pipes from the air'delivery pipe com municating alternately with the opposite ends of the air-lues.

10. In a smelting furnace, apair of heat- A ing chambers communicating with each other' at their tops, means for delivering heating gases at the lower part of one heating chamber, and means for carrying olf the gases from the other heating chamber, in 80 combination With a partition Wall between the chambers, said partition-Wall being provided with air-fines and openings leading from lthe same into the second heating chamber along the surface of said Wall, and an air-chamber arranged at the top of the ser ond heating chamber substantially at the outer portion thereof, said air-chamber be ing provided with air-outlets leading into the said chamber, and an air-delivery pipe 40 and branch pipes connecting the said air delivery pipe With the -air-flues and the airchamber, and vvalves arranged in the said branch pipes for controlling the supply of air to the said air-dues and air-chamber.

11. In a smelting furnace, a pair of heating chambers in communication With each other, lmeans for delivering heating gases to one heating chamber, and means for carrying off the heating gases from the second heating chamber, in combination with a partition Wall between the chambers, said partition Wall being formed of an interior portion and a lining, the interior portion of the partition Wall being provided with air-fines 56 and` with openings leadingv from the airuesoutward, the lining being also provided with openings adapted to register with the openings in the interior Wall portion and leadingiinto the Second heating chamber, 60 one set of openings beingsmaller incrosssection than the other.

the furnace 1 fire-box, when thev I 1Q. Tn a smelting furnace, a pair of heating chambers, communicating with each other at their tops, means for delivering heating gases at the bottom of one heating chamber and means for carrying oil" the heating gases from the bottom of the second heating chamber, in combination with a partition-wall between the chambers, said partitionmah being formed of an interior portion .and a lining, the interim portion of the partitionwall being prinidcd. with longitudinai horizontal airlues and with open- "ige leai'ling from the air-,fines toward the :ond heating chamber, ti g being "in also iirovided with openings iig to ihrsecond chamber', adapted to register with the openings in the inte wall portion and being smaller in erosssection tiran the openings in the interior 'iiiiliqaiirtifv-i.

13. ln a smelting furnace. a pair of lire boxes, a retort-heating chamber arranged l over the said fire-boxes and a rei/:arribar for l collecting ashes, residues and binders, ma ranged below said tire-boxes and :irmided with a door at each end adapted to so as lorie a, blast chamber duce a pressure and to give acer, combination with means for cutting oiii the communication between said che ocr and the lire-bewies when the doers oi the chf/initier are opened.

lil. In a sn'aeiting furnaceC a wir ci fire boxes and a chamber for eolien: residues and cinders, arranged i, L, v san,Y fireboxes and provided with doors at nach end to give access thereto, se to forni a blast chamber, and chutes leading from -the working fioor at the front of the furnace into the chamber and provided with doors at their bottoni` in combination with means for cutting oil the communication between said chamber and the irfvhboa'es when the doors of the chamber are opened.

l5. ln a smelting furna e, :i vhan'ibei for collecting residues arranged below the furnace, in combination with chutes leading from the working floor at the iront of, the

furnace into. the chamber and. provided with vdoors at their bottom, said doors not entirely closing the opening at the bottom of the "chutes and leaving 'a vent opening for the residue gases.

.In testimony whereof We hereunto alii); our signatures in the presence of two witnesses.

E W12( 'VINCEN'ILAN fhl FRANQlS ALBERT CURNUW. Witnesses f A.. Ii. IAANYON,

WM; LANYoN, Jr.

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