US898024A - Roasting-furnace. - Google Patents

Description

PATENTBD SEPT. 8, 1908.

a SHEETS-SHEET 1.

7J, Z /Q A. R. WILFLEY. ROASTING FURNACE.- `APPL'IGATION FILED 00T. 13, 1906.

No, 898,024. PATBNTED SEPT. 8, 1908.

A'. R. WILPLEY- j ROA/SUNG VFURNACE.

'APPLICATION FILED'OOT. 13, 1906.

ARTHUR R. WILFLEY, DENVER, COLORADO.

' RoAsrrnG-FURNAcn--- Specicatin of Letters Patent. Application siedocioiier is, i906. serial no. 338,726.-

Patented sept. s, 1908.

To all whom it may concern: l

, Beit known that lI, ARTHUR R. WILFLEY,

` a citizen of the United States, residing in the city and county of Denver andI State of Colorado, have invented vcertain new and useful Improvements in Roasting-Furnaces; and I do declare the vfollowing to be-a full, clear',

'- and exact description of the invention, such- -as will enable others skilledin the art to which it appertains to vmake' and use' the same, reference being had .to the accom any- I Vjing drawings, and tothe letters and gures A. of. reference marked thereon, which form a part of this specification. I

--My invention relates toimp'rovementS in roasting furnaces ofthe class adapted to pro- .duce Aa magnetic roast or a roast preparatory to the treatment of ores by magnetism,

whereby the magnetic particles are separated from the non-magnetic particles. p eretofereso far-as I lam aware great difficulty has beenv experienced in obtaining a proper roast vision for su of this c aracter,'since it is very easy to overheat the ore and cause the particles thereof to become sufficiently softA or slightly fused, to .cause them'to clingl or adhere together thusfouling. or contaminating the particles and defeating the object of the roasting operi, ation, since the clinging particles cannot be magnetically` separated. .y j In myim roved construction I make probjecting the ore under treatment and while falling, to the action of a downwardly traveling current of hot air where-byl the ore vand hot air current are traveling in V the same direction. Heretofore it'has-been attempted to obtain aroast of this character vby dropping the ore downwardly in a shaft containing an upwardly traveling current "of hot air and flame.

' andV insufliciently heating t e heavier parexactly op o site those desired. By 'causing' the -ore to e treated, to move downwardly in the same direction as the heat current, thi'sdiff'iculty is overcome @and providing a cooling medium preferably4` a water :jacket ,itI reaches the outer air since This has resulted in overheating the finer or lighterarticles ofsore,

Hence -the finer par-l at the bottom of the shaft or roasting. compartment, with Vwhich the fallingparticles of ore come in contact, the evil influences of excessive heat (attended by the clinging ofthe ore particles together) are overcome.' The ner particles 'of ore are'immediatelysuificilently cooled by contact with this j acket and it` is 4these particles thatare exceedingly .f vliable to be heated too much; while the coarser particles, though only artiallycooled by their first contact with t le water jacket, will be sufficiently cooled before they leave the furnace, -by reason of the extensive water yjacketedsurface with which they are brought in contact before they reach the atmosphere. In fact it `-is my intention to cool the entire body of ore beyond the roasting lpoint before this is not done,.the oxygen of the` air uniting with the exceedingly hotsore, will roducean overroast of the outer layer of t e mass and thus counteract or retard the beneficial effects obtained within the furnace. j l j Having briefly outlined my improved construction as well as the function it is intended to perform, I will proceed to describe the same 1in detail reference being made to the accompanying drawingl in which is illustrated an embodiment thereof.

' In this drawing, Figure 1 is a vertical section taken through a'furnace equipped with myriniprovements. Fig. 2 isa cross section taken on the line,2-2 Fig. 1 looking downwardly. Fig. 3 is a section taken on the line 3-3 Fig. 1 looking toward'the right, the upper portion of the furnace being'broken awa 'Ifie saine reference characters indicate the same .parts in all the views.

Let the numeral 5 desio'nate an upright roasting' .chamber provided cally disposed 'compartments 6 and 7 separated by. a 'partition 8 whose upper extremity-terminates' a short' distance below the archQ'at the top of the furnace whereby the two fines or compartments 6 and .7 comwith two verti A municate with each other at they top. The

The flue 7 is narrowest at the top and increases .in v size as it extends 'downwardly l' therefrom. Atthexbottom of this flue .is located a water jacket member V15 which forms a bottorninclined downwardly` from the ,par-'f tition 8. Below this water jacket member is a fire clay member 16, while below the last named member is another water jacket member 17. The three members 15, 16 and 17 are inclined in the same direction and form a continuous surface down which the ore slides as it leaves the Hue 7. At thelower extremity of the water jacket member 17, is an' outlet passage 18 while on the oppo-` .site side of this passage is a water jacket member 19 also sloping toward the said passage and adapted to guide downwardly into the said passage,v any particles or pieces of ore which may bound from the inclined sur.- face com osed of members 15, 16 and 17. Some of t e particles, particularly the Vlarger particles, when they strike the inclined mem.

l bers at the bottom of the Hues 7, are liable to drawing generally by the numeral 25. Suit- 'leftreferring to Fig. 3.

boundacross the chamber 20 andvstrike upon able provisionis made for the introduction of coolin water at one extremity of the jacket 22 and aowing it to pass out at the opposite extremity. In Fi .2 of the drawing these inlet and outlet con uits are designated 26 and Y 27, respectively.

It is not desirable that the ore after reach-` ing the vibrating trough, should be subjected to the action of the louter air or atmosphere. The rear extremity of the trough'or that farther to the right in Fig. 3 is therefore ractically closed by a depending gate 28, w ile to the opposite side o the furnace is attached a depending swinging gate 29 -which hangs downwardly into. the trough, but swings outwardly in' res onse to the action of the travel-' ing ore whic is designated 'bythe numeral 30. f In this `wa the atmospheric air is practically exclude or kept away from the ore until the latter is fed out of the trough throughthe action of the vibrating movement of the latter; and by this time the ore jury by reason of bringingit inxcontact with will be sufficiently cooled to prevent any inthe air. l

- The outer wall of the Hue or roasting comartment 7, is provided with a series of air lnlet ports 31 which have a tendency to somewhat reduce the temperature of the ore while it is falling downwardly in the said Hue. By reason of the fact that the Hue expands as'it extends downwardly from the to the cooling action is furtherfacilitated. ere it not -for thesU features, the tendency ofthe downwardly falling ore would be to increasein temperature, owing to the combustible elements as sulfur contained therein.

From the foregoing description the use and operation of my improved roasting furnace will be readily understood. By supplying the Hre box 10 with suHicient fuel, the necessary heatis generated and travels u wardly (under the inHuence of the draft of t e stack not shown), through the Hue 6, and then downwardly through the Hue 7, and thence throu the chamber 20 to the stack which must e of sufficient hei ht to give the desired draft through thel ues 6 and 7. The top 9.of the structure is provided with an inlet opening 35 whose upper extremity com- 'municates with a hopper 36 into which the ore to be treated is first fed. This ore drops downwardly and strikes upon the upper extremity 37 of the artition wall 8. The -upper extremity of t is wall is inclined downwardly from the Hue 6 to the Hue 7, thus guid ing the ore into the Hue 7 and causing it to travel downwardly with the heat current from the furnace. During thisl downward travel, the combustible elements in the ore being subjected to the heat of the furnace,

are sufficiently consumed for the purposes ofA the roast whilethe ex anding structure of the Hue together with t e inlet of a limited quantity of atmospheric air through the ports 31, prevent the ore from attaining too hlgh a temperature; and finally by reason of the ore connn in contact with the coolin medium atthe ottom of the Hue 7, the e effects of excessive heat are overcome and excellentvresults obtained. I

Having thus described my invention', what Iclaimi's:

1. A roasting furnace of the character' described, comprlsing a source of heat, an u wardly extending flue connected with t e heat source, means for feeding the ore to be treated whereby itshall enter the ore Hue in the 'upper part of the latter, a cooling medium locate atthe bottom of the last named Hue with which the falling ore comes in contact, said. medium being of such a nature as to cause the falling ore tol slide therefrom autolm'atically, and means located at the bottom of the furnace for excluding the atmospheric air substantially as described.

2. An ore roasting furnace comprising a source of heat, ahot air Hue leading upwardly from the heat source,- an ore roasting Hue communicating at the topwith the up er extremity of the lot air Hue, the ore Hue e-' ing provlded at its discharge extremit with 'a water jacketed bottom downwar 1y inclined whereby the ore is cooled and Aautomatically caused to slide from the furnace, to a device that is free from atmospheric air for the purpose set forth.

3. A roastlng furnace providedwith an upwardly extending roasting flue, a source of "automatically beyond the path ofthe falling heat communicating with said flue at the top which is also provided with an inlet for the ore to be treated, the flue having an inclined water jacketed bottom ,whereby the ore is caused to slide away from the roasting compartment, the structure being provided withl an ore outlet at the lower extiemity of the vsaid inclined bottom beyond the limits of the flue, and vibrating means located underneath said outlet for receiving` the ore and causing it to travel gradually out of the furnace. v 4. A furnace of the class described, provided with an upright roasting flue having a feed opening at the top, asource of heat communicating with said flue at the top whereby the hot air iscaused to travel downwardly through thesaid flue, the said fluo being provided with a downwardly inclined water jacketed bottom, a discharge opening at. thev lowerextremity of said bottom, a trough having a water jacketed bottom located underneath the outlet opening, and means for imparting a longitudinal vibratory movement to the said trough whereby the roasted ore is caused to travel out of the furnace.

5. A furnace of the class described pro vided W-ith an upright roasting flue or compartment provided with a feed opening at the top, the said flue increasing 1n cross sectional area from the top downwardly, the bottom of the iiue being provided with a cooling medium arranged to cause the ore to pass ore particles, substantially as described.

6. A roasting 'furnace of the character described comprising a source of heat, a hot air flue communicating at the bottom with said source of heat, a roasting flue communicating at the top with the hot air flue, the roasting flue expandingv as it extends downwardly, the last named flue being provided with a downwardly inclined water jacketed bottom to cause the ore to slide beyond the limits of the Hue, to a moving trough for the purpose set forth.

l7. A furnace of the class described, provided with a fire box, a hot air flue leading upwardly from'the said lire box, aroasting flue communicating at the top with the said hot air flue, the said roasting ilue expanding from the top downwardly, a downwardly inclinedwater jacketcd bottom at the lower extremity of the roasting flue, an auxiliary chamber communicating with the bottom of the roasting flue, and provided at the bottom with ancre outlet, a vibrating trough located below said outlet opening, and means located at the opposite extremity of the said trougl'i for excluding atmospheric air, substantially as described.

In testimony whereof I allix my signature in presence of two witnesses. ARTHUR l. VILFLEY.

Witnesses:

DENA NELSON, A. J. OBRIEN.

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