US1162894A - Ore-furnace. - Google Patents

Description

' amount of agitation, to produce thelargest possible amount of reactlonolt' the ore under 7 HQWARDFLWIERHM, or UPPER MoNTeLAIR, NEW JERSEY.

- 'onn-rmmaen To all whom it may canoe m:

Be it'known that I, HOWARD F. Weaken; citizen of the United States, residing at Upper Montclair, in the countyof E sex and State of New Jersey,vha've inventedor discovered certain new and useful Improvements in Ore-Furnaces,--of;which the followingis, a specification, reference being had therein to the accompanying'drawings.

' ()ne of the'objects of my presentfin'v'ention is to improv upon mechanical, reverberatory furnaces,

particular those furnaces which havealarge hollow central revolving shaft, for carrying the rabble arms, etc, by the application to the shaftits'elf of burners'to be used for h'eatingthe ere under treatment. 7

Another object is to modify the mechan'ical furnaces, of the types above referred to,

by the addition thereto oi heating means,

capable, on account of the particular location and arrangement thereof, of heating the ore. under treatmenhatj'the opportune moment, namely just before, or, just after, or just before and just after the rabbling takes place. I

A further object isto devise ainethod for the treatment of ore with flames and agita'tion, ints'uch a manner as to enable a given im rint of heating flame and a given treatment, With the other materials present. A' further "objectv is to introduce steam into 'theore; compartment, er; compare ments)" in such a manner as not to interfere with the proper and desired operation of the furnace, and of the flames above referred to.

This invention has 'spe'cial'applica'bility to a method of recovering sulfur from sulfid ores/by the action of a reducing flame pref erably in the presence'iot'some steam, and

i i ers have been placed, so as to p oject through preferably during the .agitation of said ore,

but can also beusfed in other c'onnections.

Berna-shave heretofore been 'ap'p'lie'dto furnaces of some of'these types, which burn the outer'ffwallfof the furnace, su h a manner that the flame, projected toward the center of the furnace, namely; toward the central revolving shaft, ,bu "is has been found to be open to certain ctions,

namely since the flame is ordinarily, more or less fan-shaped, theore which is ,near

the central shaft gets 'very'mech more heat,

of the f l\ lcDougall, ledge, Herreshotf or similartypes, andin' Application filed .l'u'ne '27", 1913. swim m, 775,128.

than the ore which is near the periphery of the furnace, and consequently the action isless uniform than isto be desired. *This makes it necessary either to overheat'the ore near the' central shaft, or to-insutliciently heat the Ore near the peripheryiof the hearth, or both,-and theseare both objectionable as making 'theffurnace reactions somewhat different in these two zones; By

jection is very largely-overcome, forthe reason that the. 'v'videst' part of the flame is near the periphery 'ofrthe hearth, and the narrower part of the 1"l ame,is near the hol- 10w shaft. i Also by--this arrangement the Specification of Letters Patent. 7 te ted- 7 5 placing the burners as above stated, this Ohflame does jnot'come into contact with the to the objection that the flame itself producespracticallynogheatingof the ore at the time when "it is in contact with the me ble, or rabble 'arIn's, iso that a material amount of heat is lost by being absorbed by the cooling fluid in the rabble arm. More;

nibbles themselves, which contact is open over, theaction of the flame upon therab-fl ble arm, causes the latter to burn out more or less, and thereby mal're's renewals more frequent. The location of the flame in'the present application avoids this injury to the rabbl a m's. a

Byarr'ang'ing the burners as above indicated,-a1-l portion of the hearth surface, or i the ore upon the hearth surface, are sue c'essively'and, uniformly heated,- and also means of this arrangement of the flame,

I can impart tothe ore on each unit of hearth surface, substantially the same amount of heat, which-means that the heat will be very uniformly distributed, and con sequently better utilized. By, this arrange ment of theb rnergwith respect to the rabbles, or'rabb1e arms, I can impart the heat to the ore, at a particular time, with reference to the stirring action of the rabblesand inthis manner I am 'enabledt'o heat-"the ore at exactly the time when jag given amount of heat, and a given amount of stirring, willjproduce a; maximum of" All this means 'a' considerable economy of fuel, also a considerable de -c crease in the wear and'iteariof the apparaa t me, and the even conditionsflmakes the process e erate more smoothly and means an increased percentage of yield from a given ambient or ere,'- -ahd also more ore eanlbe neatea'per' unit of tii'ne. i

T emp x y ng d awin s ep e t rather, diagrammatically, a] ffiififiil equipped in accordance with the present invention. I V

In said drawings, Flgure 1 represents'a vertical section of said furnace, and Fig. 2

represents a substantially horizontal plan section taken on the line 22 of Fig. 1.

In said drawings 10 represents the interior iron pipe, which forms the hollow shaft,

and whichis incased witha layer 11 of fire 7 art, and rabbles of this kind are preferably rovided ineach of the compartments, of which the furnace is constituted.

14 representsa burner, of which a num-. her are preferably provided, in each compartment, as illustrated in Fig.2, and one set of these burners is preferably placed as indicated in Fig. 2, at a point slightly in advance of the-rabble arms (the 'shaft,-burn ers and ra'bbles being rotated in the direction of thearrow 15, in Fig. 2). If desired; also another set of burners, shown at l6-may be so placed, as toimmedi'ately follow the rabble, in order to heat'the ore immediately after'the rabbling action.v These burners of this second set maybe of a smaller size and.

capacity than the burnersl, if desired.

The burners .14 and 16are connected as illustrated with an air supply 17 and a gas orioilsupply 18, both. by valved pipes in a manner well understood in the art. I

Upon the outside of the furnace Ipreferablyprovide a'buss pipe 19, through which steam is delivered to the steam inlets 20, which are preferably placed in a tangential manner, as illustrated in Fig. 2, which steam pipes are provided with suitable valves 21, for thepurpose of controlling the amount of steam admitted.

By means of the tangential arrangement of these steam pipes I can produce a much more thorough action with the apparatus, and not interfere with the flames, when the latter come in front of the steam inlets.

As stated above the burners 14 and 15 produce a more or less fan-shaped flame, as

indicated at 24, whereby the maximum amount of uniformity of heating of theore underfltreatment is possible.

Ore ispreferably admitted to the furnace througha suitable hopper 25, and the roasted, ore is removed through a spout 26, lo-

cated at the bottom of the furnace.

27 represents an exit pipe for the gases and vapors produced in operating the fur- It is to be understood that each of the several compartments or shelves of the fur- Ooples of this patent may be obtained for five cents each, by addressing" the Com mlss ionerpfia tenta v wasmn mtnc." a

. though .these xmay be omitted from some.

air and fuel supply as illustrated, and each or oil and -steam,'or, oil, steam and air, to

be controllable by a master valve, or any namely, so that the burner tube, having its 9i 'ence of a circle concentric with the shaft nace may be provided with the burners, al-

Each burnermay be connected to its own burner may be independently controllable, since it may be desired to'voperate some'of the flames highly reducing, and others only very slightly reducing, and some oxidizing.

It is'to be noted that while I have shown one: particular form of furnace, the invention is applicable toffurnaces of various forms, and I do not limit myself to the particular structure of furnace illustrated.

By the term burner in this specification and claims, I mean the device which is used to deliver the gas or oil, or thegas and air, or the gas and steam, or the oil and air,

the desired point, to be burned.

r The. burners may be all so connected as to desired combinations of burners may be :connectedby several master valves, one ofsuch valves operating the burnersof that particular set or combination Such a combination of burners as those in a given compartment 4 form a combination of burners which lend themselves readily to such an arrangement. 7 The term radially "as used in the up.- pended claims is used to designate'the man ner of locating the burners, as shown,

opening at the end, as is usual with burners of this kind, pointstoward the circumfer which carries the rabblesand burners. It I is to be noted that while the burner isshown as'having a considerable slope, in order to project the flame downwardly, my invention) is not restricted to any particular angle i this respect.

What I claim is 1. In a mechanical furnace provided with I i a revolving'shaft carrying a rabble arm, burner having an opening at its end, carried substantially radially by said shaft, said burner and the flame thereof beingout of contact with said rabble arm, and a tangent tial steam inlet to said furnace.

2. In a mechanical ore furnace, a rotatable central shaft carrying rabble arms, said shaft being provided with burners having flame openings attheir ends, said burners, bein at a small angle injadvance of 551' rabb e arms, whereby the ore on the hearth of the furnace is heated immediatelybeforq. being rabbled. i I 5 In testimony whereofI have aflixedn; signature, in presence of two witnesses.

' HOWARD F. WIERUM Witn es:

- I PERKINS,

MA? R. MCIQY... v

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