US1923866A - Sulphur bearing ore furnace - Google Patents

Description

Aug 22, 1933-. l. HgcHENBLElKNER 1,923,866

l SULPHUR BEARING ORE FURNAGE Filed ot. 26, 1929 2 sheets-sheet 1 A INVENTOR` e lngenum Hechenbmkner fly/6% ATTORNEYS Aug 22, 1933- 1. HECHENBLEIKNER 1,923,866A

SULPHUR BEARING ORE FURNACE Filed oct. 26,4 1929 2 Smets-sheet` 2 INVENTOR lngenuin Hechenbkukner Y A TORNEYS Patented Aug. 22, 1933 PATENT OFFICE- SULPHUB BEARING OBE FURNACE Ingennxn neenenbleikner, charlotte, N. signor, by mesne assignments, to

C., as- Chemical Construction Corporation, a Corporation of v i Delaware Application october 26,1929. serial No. 402,595

This invention relatesto a furnace for burn- Y ing sulphur bearing ore, and has special reference to the provision of a furnace for oxicldizintg or burning' sulphur bearing ore fines or In mechanical furnaces for burning sulphur ore smalls, fines or dust now Iin use, the commlnuted or ground sulphur bearing ore is fedin spread form through a series' of hearths, and in said spread form is subjected to the action of 'an oxidizing medium such as air flowing through the hearths. Thesehearths are com-v municatingly arranged horizontally one above 'the other; and the feeding of the ore through the series of hearths is'- effected by first introducing the ore onto the bed of the uppermost hearth, by then rabbling the ore over the bed ineither increasing or decreasing spirals, after r which the ore thus partly treated in one hearth vis dropped onto the bed of the hearth therebelow, where the rabbling process and treatj ment is continued, the ore lines going through a similar cycle in each hearth section, the resulting cinders being collected in and ren'xoyedi from the bedof the lowermost hearth section.A

For rabbling the ore, each hearth section is provided witha plurality of rabble arms on whichm are mounted rabbling teeth, and the arms of all of` the hearth sections are usually fixed to a central motor driven shaft which extends vertlcally through the mechanical furnace.

These mechanical furnaces for burning sulphur bearing ore lines or smalls are attended in use with a. number of draw-backs or disadizantages.' Due to the inherent design of these furnaces, the structures are relatively large, particularly when built to yield a relatively large output or high capacity, and this results in ar -comparatively high initial or installation cost. In operation, this type of furnace suffers some irregularities, due first to slagging and cintering of the ore which takes' place and which interferes with the operation of the rabble arms, and due second to excessive dust production, which necessitates cleaning of the flues and lconsequent service interruptions. To minimize slagging or fusing of the cinders, special constructions of rabbling means'have to be devised, and to overcome the troubleof excessive dust pro-- duction, the flue dust must be specially treated. .The regulation or control 'of the -concentration I of the combustion gases is relatively difficult with these furnaces, the choice lying generally between the loss ,of sulphur in the cinder with the consequent production of weak (ci. ca -27s) 4sulphur dioxide gases on the one hand, and the production of strong sulphur dioxide gases with the consequent incomplete reduction of the ore and substantial loss of sulphur in the resulting cinder on the other hand.

The prime object of my present invention centers about the provision of a novel furnace for treating or burning sulphur ore fines or dust operating on a principle different than that governing the operation of these known mechanical furnaces, and vin which the objections incident to and inherent in the design and use of knowri` mechanical furnaces are .effectively obviated. In accordance with my present invention, the sulphur bearing ore fines or dust are ground or granulated to a degree of iineness suchvtlat the same may be fed in a stream through a nozzle for producing a spray of the l ore dust, the stream or/and spray being intimate1y mtermixed with en oxidizing medimn 75 such as air conditioned to effect combustion of the ore spray and production of the sulphur dioxide gases. The-invention, therefore, has as its prime object the provision of a furnace in which the ore is burned in spray form.

The desiderata in 'any sulphur burning process l is two-fold; `first, it is desired that the sulphur contained in the ore be burnt as far aspossible, thus resulting in eflicient reduction of th-ore, .85 and second, it is desired that the quantity of air or other oxidizing uid be controllably such as to properly oxidize the sulphur tofsulphur dioxide, and such aS to effect the proper inter-4 mixture between the sulphur dioxide or combustion gases and additional air to produce a resulting gas mixture having a desired concentration depending upon the further use to which the gases may be put. I have found that the desired ore reduction, sulphur oxidation and gas '95 concentration may be eillciently obtained by burning the comminuted or pulverized sulphur bearing ore in stream or spray form, and I have found that this may be accomplished by properly conditioning the atmosphere in which the i dust spray is burnt and by .suitably regulating or controlling the temperature and the flow of the oxidizing and other air used in the process. The principal object of my present invention',` therefore, resides in the provision of .a spray sulphur burner constructed andy designed for producing these results.

Further principal objects of the invention include the provision of a sulphur burningfurnace in which the'ore is burned in the form of a 'uo spray, and in which -the oxidizing vmedium or air is properly conditioned by being pre-heated 4 to relativelyhigh temperatures through heat exchanging relation with the combustion gases produced in the furnace; the further provision of a sulphur burning apparatus of this nature in which the ash or cinders produced inthe burning process are collected without interfering with the proper operation of the combustion zone of the furnace; the further provision of an ore spray burning furnace provided with means for. suitably treating the cinder or ash so as to prevent coagulation or fusion thereof and so as to permit efficient removal of the formed cinders in and during the continuing operation of the furnace; and the further provision of a furnace of this kind which is comparatively simple in construction, subject to relatively facile operation, and capable of easy regulation and control.

To the accomplishment of the foregoing and such other objects as will hereinafter appear, myl invention consists in the elements and their relation 'one to the other, as hereinafter. more particularly described and sought to be defined in the claims; reference being had to the accompanying drawings which show the preferred embodiments of my invention, and in which:

Fig. 1 is a vertical elevational view partly in lcrass-section of a simplified form of the apparatus or sulphur burner of my invention,

Fig. 2 is a plan view thereof,

Fig. 3 is a vertical elevational view partly in cross-section of a modified form of the apparatus or burner, and

Fig. 4 is a plan view of this modified form.

Referring now more in detail to the drawings and having reference first to Figs. 1 and`2 thereof, the sulphur burning furnace of my invention comprises a combustion chamber generally designated as A provided with a'means generally designated as B for introducing a spray of sulphur bearing ore fines or dust into the combustion chamber and foreffecting combustion of said spray, thereby producing sulphur dioxide gases, an exit ue means generally designated as C for the combustion gases, and a collecting means generally designated as D for collecting the cinders or ash produced in the combustion process.

The combustion chamber A comprises preferably a vertically elongated unitwhich may consist of a cylindrical metal shell 10, which in the form of the invention shown in Figs. 1 and 2 is double walled to provide an intermediate air chamber for a purpose to be explained hereinafter, the inner wall 10a being interiorly surfaced with a lining 11 of fire resisting brick and the outer wall 10b being exteriorly surfaced with a heat insulating lining 12, both linings Gextending over the combustion end of the furnace or combustion chamber and terminating a distance f above the bottom section D of the furnace, as

clearly shown in Fig. I1 of the drawings. The spray producing means B is arranged `at the top or the head of the furnace, the cinder collecting l means D is arranged at the lowermost region of the furnace, and the exit flue C for the combustion gases is preferably arranged adjacent the bottom of the combustion section of the furnace, and vtherefore at a point intermediate the ends of the furnace. The furnace, if built for a y capacity to treat 500 pounds of ore fines or dust y per hour, may have an over-all height of about 30 feet and a diameter of 6 feet. The inner fire resisting brick lining functions to protect the furnace shell and to aid combustion by heat radiation, ,and the insulating lining 12 functions to insulate the air space formed between the walls 10 and 10b of the furnace shell.

The sulphurA ore `fines or dust to be used with the furnace is pulverized or ground to a degree of fineness corresponding say to 60 mesh, and a stream of this spray dust or fines is fed into the combustion chamber at the top thereof through a nozzle 13, with which may communicate a feed pipe 14 extending from the nozzle 13 to a pumping apparatus 15 located at a low level, and which pumping apparatus serves to feed the spray dust from a feed hopper 16 to and through the nozzle 13. For effecting com- `bustion of the ore stream and for assisting in injecting the same through the nozzle 13, a stream of oxidizing fluid such as air is introduced into the system by means of a valved pipe line 17 at a point or region which may be considered the junction between the nozzle 13 and the feed pipe 14, as clearly shown in Figs. 1 and 2 of the drawings. This stream of oxidizing air constitutes a primary iiow of oxidizing medium. For effecting completion of the oxidation or combustion and for producing additional air for intermixture with the combustion gases so as to produce. resulting gases of desired concentrations, there is provided a secondary stream of oxidizing fluid or air which is introduced into the combustion chamber A in a region surrounding the ore stream or the spray produced. This secondary air stream is intrcduce'd through a conduit 18 into the head 19 at the top of the furnace, and moves from this head into and through a tube or cylinder 20 which surrounds the nozzle 13, the said tube being provided with a plurality of circumferentially arranged holes or openings 2l for this purpose.

Both the primary and secondary air streams are rst suitably conditioned to effect combustion of the sulphur ore; and to this end theA air is preheated to relatively high temperatures, as for example about l000 F. Desirably the pre-heating of the air is effected by heat exchange with the hot combustion gases, and this may be accomplished by designing the furnace structure'so that a part thereof forms a heat exchanging apparatus for this purpose. In the construction shown in Figs.`1 and 2,'this is accomplished by the double walled shell structure hereinbefore referred to, the space between the shell walls 10a and 10b forming a circulating passage for the air which is fed into the system by means of a blower 22 communicating with the air space between the shell walls through an entrant opening 23 arranged adjacent the bottom of the furnace, and which air moves upwardly in said space, as shown by the arrows on the drawings, the air being pre-heated to the desired temperatures by contact with the heated interior shell wall 10a of the furnace. pre-heated air divides into the primary and secondary streams, the primary air stream piping 17 and the secondary air stream conduit 18 being for this purpose connected to the arched top of the air space, as clearly shown in the drawings. The primary and secondary air streams may be suitably controlled by means of the valve 24 in the piping 17 and the damper structure 25 in the flue 18.

For minimizing or preventing coagulation or fusion of the cinders which gravitate onto and collect upon the interior wall of the hopper- At the head of the furnace this :,osasoe to provide cooling means for this collecting hopper D.l To this end the collecting hopper may be either water or air cooled; and in the construction exemplied in Figs. 1 and2 of the drawings, I utilize the circulating air o'f the system as the cooling means for the collecting hopper. It is for this reason that I prefer to introduce the cool air at the nethermost portion of the hopper vthrough the entrant opening 23, the air in this region serving to chill or cool the inner wall 'of the collecting hopper and thereby functioning to minimize fusion diillculties. 'I'he air, as it rises in the air space between the. walls of the furnace shell, is gradually heated, and the inner fire resisting brick lining 11 is made to terminate at a point or region of the furnace so as to permit suilicient pre-heating of the air to the desired high temperatures. The outer insulating lining 12, it will now be understood, functionsto prevent heat loss of the pre-heated air. The ash' or cinder is removed through a discharge passage 26.

In the modiiication of the invention shown in Figs. 3 andl of the drawings, the oxidizing air is pre-heated by heat exchange apparatus which is separated from the furnace proper, the heat exchange apparatus functioning, however, for utilizing heat of the combustion gases for'eilecting the pre-heating of the oxidizing medium. The-furnace structure in this modication may then comprise a vertically elongated preferably cylindrical metal shell surfaced interiorly 'with a lining l1' of nre resisting brick laid onto an inner lining 27 of insulating material and forming the combustionchamber generally designated as A. The head or top of the furnace is constructed similarly to that already described in connection with Figs. land 2 ofthe drawings, in which head is mounted the ore spray producing means generally designated as B', and the bottom of the furnace forming the hoppershaped cinder collecting receptacle generally designated as D' is lalso constructed in a manner similar to that already described in connection with the construction of Figs. l and 2 of the drawings, and is provided with a cooling chamber or compartment 28 surrounding the cinder hopper, into which compartment cooling air news from an entrant opening 29 and out of an exit opening 30.

Similar to the construction already described, the ore is lintroduced through a nozzle 13 communicating with a feed pipe 14 which is connected to a` combination hopper and pump mechanism 15', 18. y l The'heat exchange means in this modified 'form of the invention comprises a brick lined .chamber 31 in which are arranged a plurality of U-shaped tubes 32, one end of each of which communicates with 'an air entrant head 33 and 'the other end ofeach of which communicates withan air exit head ,34, both heads forming parto! the chamber structure., The chamber 3 1 has a combustion gas entrant ilue 35 which communicates directly with the furnace chamber A and has a combustion gas exit flue 364 adjacent The combustion gases produced in the furnace chamber A'imove through the 'same and through the heat exchange chamber in the manner indicated by the run-mowed unes in tue drawings. 'rhefir for the system `is forcedby means of a blower apparatus 22 through a stand pipe or conduit 31 and' into the air entrantihead as, the einen lmoving-fromV this head through thepiping s2 and into the air outlet head 34. From this air outlet or exit head the air may be divided into the two streams, the primary stream moving through the piping 17 and the secondary stream moving through the conduit 18', this piping and conduit vbeing connected into the furnace system in a manner similar to that heretofore described in connection with the construction of Figs. 1 and 2 of the drawings and by means identified by similar and primed reference characters. The now of the air through the stand pipe heat exchangechamber andinto the furnace is in dicated by the arrows in Fig. 3 of the drawings. By the means described, the combustion air can be preheated to any temperature between 400 and 1000 AF., the desired temperature of the pre-heated air at the nozzle of the furnace being preferably about 1000 F. For regulating the temperature of the hotor heated air into the air chamber or tube 20' around the spray nozzle 13.', hiere is provided the valvecl bypass38 connecting the stand pipe 37 with the secondary air conduit 18'. For further controlling the air flow a valve 39 may be provided in the conduit 18'. `z In both modications of the invention, .the ore dust or fines is introduced into the furnace .chamber in the form of a spray which is oxidizedor burnedvin an atmosphere of pre-heated air. This air is pre-heated by heat exchange with the hot combustion gases either in the fur` 1 nace proper or in apparatus auxiliary to or separate from the furnace structure. The oxidizing medium or air ispreferably' divided into streams so as to carry out a completion of the oxidation, thereby minimizing sulphur loss in the resulting cinders and thereby effecting maximum oxidation of the sulphur, the fiow of the streams being so regulated or controlled as to permit the obtaining of sulphuridioxide lgases of! desired concentration or atrength.` 'I'he cinder isreadily collected and removed, and is so treated as to coagulation troubles. \The apparatus in either form of the invention is oi`rela' tivelyrv simple design and may be built at a ccmparatively small or low initialcost? The apparatus may be readily regulated and easilyl controlled, and may be repaired at small cost. Other advantages will be obvious to those skilled in the art;

While I have shown and described my lnvention in the preferred forms, it will be apparent that other changes and modifications may be made in the structure disclosed without departing from.. the spirit of the invention, deiined in the following claims.

I claim:

, 1. A furnace for burning sulphur orev to produce 'sulphur dioxide for sulphuric acidl a combustion chamber,

4manufacture comprising bearing means for producing a spray of sulphur ore fines and introducing rsaid spray into vcombustion--chamberyimeans to pre-heat the oxidizing medium by means of the heat'of combustion of the sulphur ore, and means for in-f troducing the thus heated oxidizing medium into comixing' relation combustion ot-"said ore' and for the ,production oi' sulphur dioxide gases.

2. A furnace for burning sulphur ore to produce sulphur dioxide forsulphuric acid said with said spray; for'.

manufacture comprising a combustion chamber,

means-for introducing a spray'of sulphur bearing ore mies L into said combustion chamber. :means for introducing an medium-into co-mixing relation with said spray for combustion. of said spray thereby producing sulphur dioxide gases, and means arranged in heat exchange relation with the combustion gases for preheating the oxidizing medium.

3. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture comprising a combustion chamber, means for introducing a spray of sulphur bearing ore fines into said combustion chamber, means for heating an oxidizing medium to relatively high temperatures, and means for introducing the said heated oxidizing medium into co-mixing relation with said spray for combustion of said spray and for the production of sulphur dioxide gases.

4. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture comprising a combustion chamber, means for continuously feeding a stream of sulphur bearing ore ilnes into said combustion chamber, means for 'injecting an oxidizing medium directly into said ore stream, and means for introducing additional oxidizing medium into said chamber in a stream surrounding said ore stream.

5. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture comprising a combustion chamber, means for continuously feeding a spray of sulphur bearing ore fines into said combustion chamber, means for injecting anair stream di- -rectly into said ore spray, means for introducing additional air into said chamber in a stream surrounding said ore spray, and means for preheating said air streams to relatively high temperatures.

.6. A furnace for burning sulphur bearing ore lto produce sulphur dioxide for sulphuric acid manufacture comprising a combustion chamber,

i means for continuously feeding a spray of sulA phur bearing ore fines into said combustion chamber, means for injecting an air stream into said ore spray, means for introducing secondary' air into said chamber in a stream surrounding said ore spray, means for controlling said air streams to'eifect combustion of said ore and prc-^ duction of sulphur dioxide gases of predetermined concentrations, and means arranged in heat exchange relation with said combustion gases for preheating at least one of said air streams to relatively high temperatures.

'7. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuricY acid manufacture comprising a vertically elongated combustion chamber including top, intermediate, and bottom portions, a spray nozzle arranged at the top portion of said combustion chamber,"

means for -feeding a stream of sulphur bearing ore fines into said spray nozzle and producing a spray of said lore nes, means for intermixing a heated oxidizing'medium with said stream of ore fines lfor combustion of said spray and for the production of sulphur dioxide gases, means at the intermediate portion of said combustion chamber' defining an exit for the combustion gases, and the bottom portion of said combustion chamber being arranged for lcollecting and discharging the ore cinders.4

8. A furnace for burning sulphur bearing ore to producesulphur dioxide for sulphuric'acidIy manufacturel comprising a vertically elongated combustion chamber including top, intermediate,

and bottom portions, a spray nozzle arranged' combustion of said spray and .for the production of sulphur dioxide gases, means at the intermediate portion of said combustionA chamber defining an exit for the combustion gases, the bottom portion of said combustion chamberv being arranged for collecting and discharging the ore v cinders, and means for cooling said cinder collecting portion to prevent fusion of said cinders. 9. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture comprising a vertically elongated ,-v.

combustion chamber including top, intermediate,

andvbottom portions, a spray nozzle arranged at the top portion of said combustion chamber, means for feeding a stream of sulphur bearing ore fines into said spray nozzle and producing a spray of said ore fines, means for introducing a stream of heated air with said stream of ore fines for combustion of said spray and'for the production of sulphur dioxide gases, the bottom portion of said combustion chamber being arranged for collecting the ore cinders, and means for cooling said collecting portion to prevent fusion of said cinders and-for heating said air stream by causing heat exchange therebetween.

'1 0. A furnace for burning sulphury bearing ore to produce sulpur dioxide for sulphuric acid manufacture comprising a vertically elongated combustion chamber including top, intermediate,

and bottom portions, a spray nozzle arranged at thev top portionof said combustion chamber, means `for feeding la stream of sulphur bearing ore nes into said spray nozzle and producing a spray of said ore fines, means for introducing a manufacture comprising a vertically elongated combustion chamber including top, intermediate, and bottom portions, a spray nozzle arranged at the top portion of said combustion chamber, means for feeding a stream of sulphur bearing ore fines intosaid spray nozzle and producing a spray of said ore fines, means for introducing a stream of an oxidizing medium into said stream of ore fines and for introducing a secondary 0x1-- dizing medium into said chamber into al stream surrounding said spray, said streams of oxidizingA medium functioning for combustion of Vsaid ore spray and for the production of sulphur dioxide gases of desired concentrations, heat exchange means utilizing heat of said combustion gases Afor pre-heating'` said streams of oxidizing medium to relatively highvtemperatures.

and means to cool the bottom portion-ofsaid'- combustion chamber for collecting the ore cinders.

to produce sulphur dioxide for sulphuric acid manufacture comprising a vertically'elongated combustion chamber including top, intermediate, and bottom portions. a spray nomle arranged at the top portion of said combustion chamber,

12. A furnace for burningsulphur m T means for feeding a stream of sulphur bearing ore nes into said spray nozzle and producing a spray of said ore fines, means for introducing a stream of an oxidizing medium with said stream of ore fines for combustion of said orev spray and for theproduction of sulphur dioxide gases, means arranged at the intermediate portion of said combustion chamber dening an exit for said combustion gases, heat exchange means utilizing heat of said combustion gases for' preheating said stream of oxidizing medium to relatively high temperatures, the bottom portion of said combustion chamber being shaped to act asa hopper for collecting the ore cinders, and means fory cooling said hopper or bottom portion. y

13. A furnace fory burning sulphur bearing ore to produce sulphur dioxidev for sulphuric acid manufacture comprising a vertically elongated combustion chamber including top, intermediate', and bottom portions, a spray nozzle arranged at the top portion of Asaid combustion chamber, means for feeding a stream of sulphur bearing ore fines into said spray nozzle and producing a spray of said orelines, means for feeding a stream of air with said stream of ore fines for combustion of said spray in order to produce sulphur dioxide gases, means at the intermediate portion of said 'combustion chamber defining an exit for the desired combustion gases, the bottom portion of Vsaid combustion chamber being arranged for collecting and discharging the'ore cinders and impurities remaining after the combustion of the sulphur.

14. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture, comprising a' vertically disposed greatly elongated combustion chamber including top, intermediate, and bottom portions,

means at the top portion of said combustion chamberfor feeding sulphur bearing ore fines into said combustion chamber, means for introducinga stream of an oxidizing medium into said chamber for combustion of `said 4ore and for the production of sulphur dioxide gases, an exit duct f or the combustion gases at the intermediate portion of thechamber, the bottom portion of said chamber being shaped to act as a hopper for the collection and discharge of ore cinders.

l5. A furnace for burning lsulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture, comprising a vvertically disposed greatly elongated combustion chamber including top and bottom portions, means at the top portion of said combustion chamber for feeding sulphur bearing ore iines into said combustion chamber, means for introducing a stream of an oxidizing medium into said chamber for lcombustion of said ore and for the productionof sulphur dioxide gases, the bottom portion of said chamber being shaped to act as a hopper for the collection and discharge of ore cinders, and means to cool the bottom portion of said combustion chamber.

16. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture, comprising a vertically disposed greatly elongated combustion chamber including top, intermediate, and bottom portions, means at the top portion of said combustion chamber for feeding sulphur bearing ore nes into said combustion chamber, meansfor introducing a stream of an oxidizing medium into said chamber for combustion of said ore and for the production of sulphur dioxide gases, an exit duct for the`combustion gases at the intermediate portion of the chamber, the bottom portion of said chamber being shaped to act as a hopper for the collection and discharge of ore cinders, and means to cool the bottom portion of said combustion chamber.

17. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture, comprising a vertically disposed greatly elongated combustionchamber 'including top, intermediate, and bottom portions, means at the top portion of said combustion chamber for feeding sulphur bearing ore fines into said combustion chamber, means for introducing a stream of an oxidizing medium into said chamber for combustion of said ore and for the production of sulphur dioxide gases, an exit duct for the combustion gases at the intermediate portion ofthe chamber, the bottom portion of said chamber being shaped to act as a hopper for the collection and discharge of ore cinders,

-at ,the top portion of said combustion chamber for feeding sulphur bearing ore fines into said combustion chamber, means for introducing a stream of an oxidizing medium into said chamber for combustion of said ore and for the -production of sulphur dioxide gases, and an exit duct for the combustion gases at the intermediate portion of the chamber. the bottom portion of said chamber being shaped to act as a hopper for the collection and discharge of ore cinders, said bottom portion being provided with heat exchange means for bringing the oxidizing medium into contact therewith, in order to preheat the oxidizing medium and cool the bottom portion.

mGENUm HEcnENBLEmNER.

disposed 1,923,866.Ingenuin Hechenbleikner, Charlotte, N. C. SULPHUR BEARING ORE FURNACE. Patent dated August 22, 1933. Disclaimer filed May 21, 1935,

by the assignee, Chemical Construction Corporation. f Herebyenters this disclaimer to claims 3, 7, 13, and 14 of said patent reading as o ows:

3'. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacturecomprislng a combustion chamber, means for introducing a spray of sulphur bearing ore fines into said combustion chamber, means for heating an oxidizing medium to relatively high temperatures, and means for introducing the said heated oxidizing medium into co-mixing relation with said spray for combustion of said spray and for the production of sulphur dioxide gases.

7. A furnace for burning sulphur bearing ore to produce sulphur dioxide for sulphuric acid manufacture comprising a vertically elongated combustion chamber including top, intermediate, and bottom portions, a spray nozzle arranged at the top v 'ortion of said combustion chamber, means for feeding a stream of sulphur bearing ore fines, means for inter-mixing a heated oxidizing mediumwith said stream of ore nes for combustion of said spray and for the production of sulphur dioxide gases, means at the intermediate portion of lsaid combustion chamber defining an exit for the combustion gases, and the bottom portion of said combustion chamber being arranged for collecting .and dischar ing the ore cinders.

' 13. A furnace for burning suphur bearing ore to produce sulphur dioxide for sul huric acid manufacture comprising a vertically elongated combustion chamber inciuding top, intermediate, and bottom portions, a spray nozzle arranged at the top portion of said combustion chamber, means for feeding a streamV of sulphur bearing ore fines into said spray nozzle and producing a spray of said ore fines, means for feeding a stream of air with said stream of ore fines, means for feeding a stream of air with said stream of ore fines for combustion of said spray in order to roduce sulphur dioxide gases, means at the intermediate portion of said combustion c amber defining an exit for the desired combustion gases, the bottom portion Vof said combustion chamber being arranged for collecting and discharging the ore cinders and impurities remaining after the combustion of the sul hur.

` 14. A furnace for burning sulphur caring ore to produce sulphur diozde for rsulphuric acid manufacture, comprising a vertically disposed greatly elongated comt bustion chamber including top, intermediate, and bottom ortions, means at the top portion of said combustion chamber for feeding sulphur earingore fines into said combustion chamber, means for introducing a stream of an oxidizing medium into said chamber for combustion of said ore and for the production of sulphur dioxide ases, an exit duct for the combustion ases at the intermediate portion of the chamr, the bottom portion of said cham r being shaped to ac t as a hopper for the .collection and discharge of ore cinders.-1

.Gazette June 18 1935.]

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