US528016A - Fueiaoe fob boasting ores - Google Patents

Description

1 2 sheets-sheet 1.v

(No Model.)

` P NABF PURNAGE FOR RoAsTING CRBS. No 528:016. L Pa.,te\nted`0ot.23,f1994.

2 Sheets-Sheet 12.

mmm ont. 23,1894.,

(No Medef) P. NEP.

` 'FURNAGE- POR 'ROASTING 0RBS No. y528,0l6.

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Enom, smhgjasfwin enable-othersskmed1in; the 1Q Itho senile;` reference fbeingy to'the .accom-" pgtnyin g drawgsiand to letters of reference marked thereon;- wli`ich.:-f9mpartpt' this UNiTED lS'Tiifrlazs- PATENT OFFICE..

PAUL nrt-hinten ARcEN-rgmn, KANSAS- I Yifummcla'FoR RoArsTl'Nec-rones.. j

` srEcmcnrroN forming-pact omettere. .Patent No; seeplegnatd october 23,1894. A ppntmgn; neanugtsfzt, 189s. rtm1ivo.ts4.'o7o.,- maman' of. Switzerland, residingsat Argentine; in theart to which it" gappertai'nsto. make-and' use ianys'frequisite,- the 'cylinders beinggenf orally/@bont thirty feet in length,ga.nd driven,V

: are` shown-it respeic-tively.v The. ire-I vbrick'liningvto the furnace-fis; Withad-vstimmige,l

1 xn-ztdeiol` consi-dernblethickness so as'etofretain other, .the ..orepassing into and-.zout c'lifthe' `roast i"n gcy linder ini a continnnsstrenr, and

the obgectfoffthe'epresent;invention is 'to pros vide such a;furnace?whichwillgaorda. most intimate contact betweenthel pnlvernlent ore I 25';

and thefairladmi'ttedffor the 'combustion of theY sulglur'carried by theroreseend will proiduce, as @t product; e;perfectly roastedore, Aand, also concentrated-,1 snlphurons scid, gas, by

roasting cylinder.

Ai fnrtherobject; inl view is' tored nce, the Y repair, by System yof iron partitions, .and ein arrap gement'of Fthei-y air inlet ductsif and fur-ifi nace construction -whichf prevents fthe 'del` heat-or the action thereonof snlphuricecidi generated inthe furnace.

`I`14: .1 struction and-'arrangementhereinafter tiescribed and claimed.

These;objects1 attain byme'ansj oi .the con x 1sA a vertically :longitudinal sectlon of 'er revolving roasting furnace embodying the presi',

- ent invention. 'I jFiiz; 2 is an end view` of, 'the -dischztrg'eend of the same. Fig'.3 isa transf,

verse section taken on the'lne Fig.` 1i

Fig-4. is atransversesecton taken on the v` er se sections of 'a roastingcylinder i1lns-` angle' irons or tiangeslattatched to oreformed f on .thecen'traliron tubeLDl4 the partitionsfsuccessively lift-.the ore and allow it to fall ina. shower throhgh-the holes there `is inserted-a smaller pipe E,"nn air in let-, which pipe extendsfin nearly to the Dv neagrrthe discharge epd of the cylinder, for

. the roastingcylinder as' hereinafter described.'v In mostcases it is not desirable toallow oreduring' theiirst stage ofroestingfor the heat at'thet p ointis the greatest, andfurthex:

irons here"a.re bolted for. .riveted Atheradi'atl f .iron partition "plates C, C; which-plates, in -the iirstform. of' construction illustrated, are bolted, OrrivetedQaIOng' their inner edges 'to` 75 lllajchotl thejplates isf provided with .a line 'of holes; c, andas thecylinder revolves 8 A. c',-f,ron'1 one of the rndialchamber's formed by *the partitions into the n extfchamber. Thus a shower of nre-is :produced -over thewhole farther endl oftheencompassingpipe D, and issn-pported and stayed to the v'latter bythe rbolts ef. Openings e are provided in the pipe 495 the passage-of airfromthe central pipe-into' iron constructions te come incontact with the IOO 'if the finoistureis all driven oft `fron1 the l fresh ore before it reaches the iron of 'f of ore, 'which is a great advantage in se the roaster, the destruction of the llatter by' t curing good roasting.

snlphnric acid is avoided. "llo this end the iron partitions,'C, and the central tube, l), do not extend entirely through to the receiving end of the roasting cylinder, ybut stop/ sho'rtas shown; and the brick .lining of the upper end of the cylinder is provided with 'longitudinally 4projecting ledges Il which" 1o formv ore litters that carry up the ore as the cylinder slowly revolves, and/allow it to fall back in showers. l

The upper end of the cylinder tits closel-y against the face of the l*stationary line Vl, i 5 which may lead to aV chimney stack or to ap pliances for treating or saving the sulphurous or' other gases produced by the roasting process. Afeed'ehutefor the oreis shown at R and the ore is fed'into the cylinder ina zo steadystream, by any suitablev automatic. feeding device in the usual way. In the present case a feed hopper and Achute simply are shoWn,lit not being necessary to illus- 'trat'e the details of an automatic, feeder.

Thesnccessful operation of the roasting furnace req'uiresgthe exclusion of .all air except such asenters through the ai'rinletpipe E and becomes WarneA before itre'aches "the ore, and also calls for a uniform and auto- -matic discharge ofthe roasted ore. For this purpose there are discharge openings f, in the-.discharge end d of the cylinder, one opening for each longitudinal section'r apartment. These openings are normally closed 3 5 by means of thefspring pressed covers or doors g, each of which is hinged to a support' ing arm g', and has an outwardly extending arm Y his the spring. for hold itsseat.

G' is a stationary rod or cam surface conforming in curvatureltothe, diameter of the cylinder as will appear fromllig. 2, and so placed with respect to the end of the roastingcylinder that 'itwill engage with the rods t' and press them back, opening the discharge holes f as they successively approach the bottom position, and holdthem` open for a short' period. After eachv rod t' has passed the stationary ycam rod G, the cover closes down on itsopening till the furnace has again made a revolution, and the opening remains closed against the admission of cold air.. In connection with each opening, f, there is a slide 5 5 K 'which can 'be pushed in more or less in order to reduce the` size of the opening f. The openings f when fully opened extend to the inner edge of the cylinder lining, and by-pushing in the slide K, lit will be seen that a barrier lis formed againstthe free discharge of allore resting at that point on the bottom ofthe cylinder. Qnly such'ore as can flow over the inwardly projected end of the slide" plate K can be discharged; Hence the amount of ore inthe furnace can thus be regulated at will according tothe character ing the door against lt will be seen that it is not material how many of the iron partitions the furnace has. 7o instead ot four as above described there may be six, as illustrated by Fig, 5,- and in this casethere would be six discharge openings. ln VFig' each of the parti-tion plates C2 is bent laterally and riveted along its -inner edgeto the adjacent plate, thus inclosing a' central space which performs thefunction'of the tube D in the first construction.

The operation. of the furnace is briefly as follows: `The ore beingvfed in steadily and con. 8o tinuously through the'feed spout R it enters v the upper end of thecylinder andas the latter slowly revolves it is carried up by the ledges II, and later bythe partitions Chaud show ered through the openingsjc, thus giving an 'intimate and oft repeated contact between the ore particles and the hot air.` Finally when the ore .reaches the lower end of the cylinder it discharges through the openings f, the same being automatically opened for a` short period of tim`e,'as before described,

I when they reach the lower part of .the cylin. ders revolution, and then closed for the rest of the circle. The ai-r'enters only through the center pipe E yand natural dr'aft'alone may be used or it may be forced in by means `ot` a fan orblower. .Passing in to the farther end of the pipe E it theny returns through the annular passage around the pipe E and within the -pipe D, or inthe case of the construction illustrated by Fig. 6 through the tight central channel around the pipe E. The air then enters the roasting part of the furnace through the holes e.- During the pas. vsage of the air along the red hot iron it is heated, and the iron, especially at the inner end 'of the flue D where the heat from the roasting of .the freshore is the greatest, is cooled' and preserved from destruction. A- part of the superfluous heat, which is produced by the intense combustion of fresh ore near the feeding end of the furnace, is thus transported to the discharging end, wherein ordinary furnaces a large volume of cold air meets-partially burned ore and reduces the' heat below the roasting temperature. lf ore is to be roasted which does not furnish enough heatvby its own combustion, the air can be heated' before it is introduced through the pipe E. y Having thus describ I claim as new is- 1. "A revolving roasting furnace' having a central metal air inlet pipe receiving air in at one'end and with openings therefrom into the roasting cylinder only at the discharge end thereof, in combination with metal par` titions connecting said central pipe with the cylinder walls, said partitions having holes for the passage of ore therethrough, substaned theviuvention, what tially as and for the purpose set forth.

2. ln a revolving roasting cylinder the com- IOO binationwith' an Linner. air inlet ,pipe leading in 'from the discharging end of the furnace' toward the'feeding end, of'an outer pipe en# oompassing theisame and forming a' return passage for the incoming air back to the discharging4 end, said outer pipe having air pas,-`

j sages from .the same into the roasting chamber only at the'l discharging end of the cylinder, substantially as and for the purpose set forth.

' Y 3. A revolving roastinglcylinder having an op'en section at the feeding end with-lining.

and `ore lifting devices carried thereby of fire brick, in combination with a metal airinlet pipe and ore lifting partitions extending through the lowerportion of thecylinder,

radially and outwardly projecting arm4 thereso placed as to engage with said arms and temporarily open the doors, substantially as l l 3 and for the purpose set forth. f

I5. A revolving roasting cylinder having an 4open section at the feeding end with lining [and ore lifting devices of fire brick, inv combination with` an air inlet flue and metal ore,

lifting devices extending through the lower portion of the cylinder, said air inlet flue discharging air into theroasting chamber near th'edischarge end thereof, substantially as and for the' purpose set forth.

6.- A4 revolving roasting cylinder having oneor more discharge openings in the end thereof, said openings extending inward from the surface of the'furnace lining, with movableslides therefor adapted to be moved radially inward, whereby the amount of ore retained in the cylinder can be regulated, substantially as set forth.

i. PAUL` NAEF. Witnesses:

.G. GARTON, S. B. DAVIS.

'for,"in' combination with a stationary piece

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