US2433781A

US2433781A - Ore roaster

Info

Publication number: US2433781A
Application number: US503607A
Authority: US
Inventors: Harry L Mcfeaters
Original assignee: PENNSYLVANIA ENGINEERING WORKS
Current assignee: PENNSYLVANIA ENGINEERING WORKS
Priority date: 1943-09-24
Filing date: 1943-09-24
Publication date: 1947-12-30
Anticipated expiration: 1964-12-30

Description

5 Sheets-Sheet l ORE ROASTER H. L. MCFEATERS Filed Sept. 24, 1943 II E/ Dec. 30, 1947.

Dec. 30; 1947. MCFEATERS 2,433,781

ORE ROAS TER Filed Sept.' 24, 1943 5 Sheets-Sheet 3 Dec. 30, 1947'.

H. L. M FEATERS ORE ROASTER Filed Sept. 24, 1945 5 Sheets-Sheet 4 Dec. 30, 1947. L, MOFEATERS 2,433,781

" ORE ROAS TER Fi-led Sept. 24, 1.943 5 Sheets-Sheet 5 Patented Dec. 30,1947

ORE ROASTEE Harry'L; McEe'atcrs," New cam ra; g assignor to Pennsylvania Engineering-Works?a corporation This-invention! relatessto ore :roasters "andione object of this invention is to produce an improved rotatable, internally fired =ore..,roas.ter., Y

Another; object is' .to.,.produce arotatablelhorir zontallt? disposedf, internally firedl ore. roaster, having a1. normally; closed 17 opening in ionic wall thereof ,"whihsis' offsuch size .asjto permitjja relai tiyelit, quickl. dischargeli of the roasted contents. whens-the ,ldoor J is. removed). andlthe roaster vrotatedgto dischargezposition andi'a quickl chargingoffthe roasteriwhene the same islrot'ated to. ch'arg lng positiontwit'h' the? doornremoyed-u iAnother-v object; is; tom produce. an, active ore roaster I of; the arotatable, internally. fired". type, wh'lch is, of such-relativelygreat'internaldiameterias 1:omparedvwithitsrinternalflength that the exposedisurfacetofjthe material. bfeing roasted; lis relativelyegreatil A'stillffurtherrobjct is,.to..lproduce. a,rotatable, horizontally, di'sposedlore I-roasterl of: sturdy; and. improvedconstruction; I

A still further obj ect issto-produceranaextremely. efiicient combinationr comprising; a, rotatable; horizontally d-isposediinternally. fired-llore roaster having a relatively -v large,- normally closed openings intermediate its (ends-fora charging-, anddi'scharging a,chutel,forg1 l iding a,fu1ll;charge -of materialtto be roasted-into ,the. roaster whenrthe same ,is' in charging position another chute+fon conyeying the entire ,.contents.k.of the-roastento a. ladle gor'oth'er' receiving container when the. roast-. er is" rotated to discharge ositi'onlwlth' its" door open.

These andother objects whichfwi'l'lbe apparent to -thoseskilled= irr-the ore-roaster 'art, rattainby means of the elements and their coasting-"ar rangement*described'fin'the:specification andils lustrateddnthe drawings-accompanyingthe same and fdrmin-gpartof thisapplication;

In'the-drawin'gs: v V

Figurvl aviewipartiallynn" side elevation; and partially in 1; section; of an ore; roaster emf. bbdyingfthis' invention; r I

caster, in ,transyersesection; on{ at; re

duced .lscale's. This, {view illustrates; more or 1685.

schematically.v the: door raisingig and?v lowering; mechanism thew chute for o-idles the :1 char e into-r the roasterathe=1chutatforrconveyingstherdis charged ero'astedsoreofrom tltheiroaster to the re ceivingz- 1ad1e:.:or:.car:andithe ladlesflor contz'tinens= usedefor scharging the roaster and for receiving the roasted charge.

"Siasomewhat dia rammatic-view show-+ 2.- Fig; 4'is"'a front. elevationalview looking toward'the left'of 3} and" Fig1fl5f is" a" transVersesectiorial view of the roaster? and illustrates the damper" controlled conn'ectlon'between the exhaust endof the roast- The roaster; of thisyapplication' has an outer shelfformed 'of"relatiVely-heavy steel plate sections welded" together: The shellcomprises a central cylindricalbody'portion I0, having-a diameter thatexceedsi its length, and-frusto-conicalfendjportions I Iiand I2 joined'to the body portion and having their" walls inclined to the horizontal axis of the body portion at-an angle of approximately; 45. The outer' ends of the frusto=conical endportion are open;

The cylindricahb'ody"portion is provided with a generally rectangular charge and discharge opening I 3 "*(Fig: 4)], which is normally closed by means if ofia" door I 4- having lifting lugs I5 cast thereon.

The shell is provided with'anouter heat insulating "lining; I G'iand an inner refractory lining IT, preferably formed-"0f suitable fire brick. Each of'these liningsis of substantially uniform thickness throughout the shell body.

Encircling the'iroaster at each weld line betweenjthe central "body portion I0 and end 'portions I Ii'and I2'iis 'a' ring-like member I 8. Each ofith'ese memb ers ispreferably' formed from loco-' motive'ti're'tsteel'and the shell beneath each of these ring-like members is encircled; and therefore reinforced, by several layers of steel plate as at; I91 These;v encircling reinforcing plates extend inwardly 'beyond'thelines of weld 20 and also' out beyond thelines of weld so that they overlie and are spaced from the end portions II and'jI zas'sh'own in*Fig.11.

Afringgear'il ismounted' on and secured to endsh'ell I2'and"of"course is concentrically arranged with relation to the outer bearing surfaces'ofring members I8 which contact with spacedsupportrollers 22. There are two spaced rollers" with "which each" ring memberw contacts, so that the roasterfis'supported for rotationon fourrollersizr The -roller shafts 23 are 'journaledfor rotation withinpill'ow"blocks'i24 which can be adjusted to; and set in adjusted position on slides 25 by means of adjusting screws 26;

End membjerI I of 'the'roaster'terminates in a cylindrical sleeve-like portion 21, and secured to this "portion" is a sealing tmemberl Ed-which is L,-

shaped in.1crossjsection.and. which coeoperates withaistationaryasealihg. member 29, also prererably L-shaped in cross section. Member 29 is secured to a metal ring-like member 30 which forms part of the support for the stack connection iii; the stack being numbered 32.

The stack connection support is lined with refractory material 33 and has an opening 34 in its bottom leading to a metal dust leg 35. This dust leg is provided with a sliding bottom or gate 35 which can be opened and closed by means of a hand lever 37 through a link connection 38.

Stack connection 3| is provided with a damper 39 which may be operated by a lever 40 arranged to be locked in adjusted position by means. of a locking pin il. End l2 of the roaster is provided with a depending annular sealing flange 42.

A burner, which as an entirety is numbered 43 is preferably a long flame emulsion type oil burner. This is provided with a burner block 44 which projects into the opening in end member l2 and terminates in line With the inner face of the fire brick refractory lining of such end member. A hollow annular metallic member 45, forming a cooling water chamber, surrounds and forms a'support for burner block M. This is provided with a cooling water inlet and a cooling water outlet (not shown) by means of which cooling water is circulated through such chamber. Member 45 and therefore burner 53, is supported by a stationary support 45.

Air is supplied to the burner through an air pipe 47 while steam is supplied through a valve controlled pipe 53, and oil through a valve controlled pipe 49.

A pinion i] meshes with ring gear 2| and is driven by an electric motor 5| through a suitable reduction gear 52. A magnetic brake 53 is used for stopping the motor and therefore the roaster when desired. A turbine type pressure blower 54 driven by an electric motor 55 is used for supplying air under pressure to the burner through air pipe 41.

The cast iron door M for closing charge and discharge opening I3 is lined with refractory ma terial 56 and said door is provided with a looking bar 57 which is mounted for swinging movement about a pivot pin 58 bolted to the door casting at its center. This locking bar is adapted to be manually operated and swung to and from looking position beneath lugs 59 secured to the roaster shell at spaced positions adjacent the longitudinal center of the door. Bolts provided with hand wheels 59 at their upper ends are threaded through the locking bar and the bar is swung to position under lugs 59. These bolts may be used to lock the bar. in position beneath the lugs.

The door may be raised from and lowered to.

position by means of a crane. I prefer however. to use an electric or air operated hoist 6| for that purpose.

A chute 62 secured in position above the roaster is so constructed and arranged as to be capable of guiding a full roaster charge of ore delivered to it by a ladle or other container 63.

Chute 65 positioned below the roaster is so constructed and arranged as to receive and guide the roasted charge from the roaster to a suitable ladle or other container 65, by means of which it may be carried to the furnace.

In Figure 3, hoist 6| is shown attached to the lifting lugs of the door by chains 66. After the door is unlocked (it being shown in locked position) and lifted clear of the roaster, the roaster is rotated in a clockwise direction until opening ted lines. A charge sufficient to fill the roaster to the normal charge line is then dumped into chute 62 and by it delivered through opening l3 as a single charge.

After the roaster is charged, it is rotated counterclockwise until opening 13 is below the suspended door. The door is then lowered to position in the opening, unhooked from the hoist and latched. The roaster is then rotated either clockwise or counterclockwise as desired at a speed of about 5 R. P. M. until the ore charge is completely roasted or calcined. Rotation is then stopped with the door directly below the hoist. The door is then unlatched and lifted clear of the roaster and the roaster is slowly rotated in a counterclockwise direction until opening I3 is at the bottom of the roaster. The roasted charge starts to discharge as soon as the down side of opening i3 passes top 61 of chute 64.

The entire contents will have been discharged by the time opening 53 reaches its extreme down position.

Since the opening I3 extends throughout substantially the full length of the refractory lining for the cylindrical body portion, it will be seen that when the roaster is rotated to discharge position with the door open, the inclination of the inner surfaces of the refractory lining of the frusto-conical end portions causes the roasted material not only to flow freely toward opening l3, but to in effect avalanche through such opening, thus facilitating a rapid discharge.

In one roaster involving this invention and of six tons capacity, the internal diameter of the central body portion is about 9 feet 6 inches and the distance from the burner mouth 68 to the entrance 69 of the outlet passage is about 11 feet. The internal diameter, therefore, is relatively great as compared with the length of the. roaster chamber. A charge line is indicated at T9 and is but slightly less in length than the distance between the burner mouth and the entrance to the outlet passage.

As the roaster rotates, thecharge of course is carried by the advancing side and at its center will be slightly lower than indicated at T0. The exposed surface of the charge, due to the relatively great diameter of the central cylindrical portion, is relatively great and is, therefore, effectively heated by the burner flame traversing the roasting chamber from the burner outlet to the outlet port.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: I

1. An ore roaster mounted for rotation about a horizontal axis and comprising a central cylin-- drical body portion having a diameter which is at least equal to its length, frusto-conical end portions joined to the body portion, andeach having its outer end open, a refractory lining for the cylindrical body portion and the frusto-conical end portions; said body portion being provided with a charge and discharge opening in its cylindrical wall having a length substantially equal to the distance between the refractory line ings of the frusto-conical end portions, a door for closing said charge and discharge opening, and means for rotating the roaster about its horizontal axis; the angle between the inclined surfaces of the refractory linings of the frustoconical end portions and the horizontal axis of the roaster being such that discharge of roasted material is facilitated.

2. An ore roaster mounted for rotation about a horizontal axis and comprising a cylindrical body portion, frusto-conical end portions joined to such body portion and each having its outer end open, a refractory lining for such body portion and refractory linings for said frusto-conical end portions; said body portion being provided with a charge and discharge opening in its cylindrical wall having a length substantially equal to the distance between the refractory linings of the frusto-conical end portions, a door for closing such charge and discharge opening, means for rotating the roaster about its horizontal axis, a burner extending into the outer open end of one frusto-conical end portion, a stack connection engaging the open end of the other frusto-conical end portion, and a dust leg below such stack connection.

3. An ore roaster mounted for rotation about a horizontal axis and comprising a cylindrical body portion, frusto-conical end portions joined to such body portion and each having its outer end open, a refractory lining for such body portion, and refractory linings for said frusto-conical end portions; said body portion being provided with a charge and discharge opening in its cylindrical wall having a length substantially equal to the distance between the refractory linings of the frusto-conical end portions, a door for closing such charge and discharge opening, means for rotating the roaster about its horizontal axis, a water cooled burner extending into the open end of one such frusto-conical end portion, a seal between such burner and such end portion, a stack connection to the open end of the other frusto-conical end portion, a seal between such stack connection and such end portion, and a dust collector below such stack connection,

4. An ore roaster mounted for rotation about a horizontal axis and comprising a cylindrical body portion, frusto-conical end portions joined to such body portion and each having its outer end open, a refractory lining for such body portion and refractory linings for such end portions; said body portion being provided with a charge and discharge opening in its cylindrical wall having a length substantially equal to the distance between the refractory linings of the frusto-conical end portions, a door for closing such charge and discharge opening, means for rotating the roaster about its horizontal axis, a burner extending into the outer end of one frusto-conical end portion and a stack connection engaging the open end of the other frusto-conical end portion.

5. An ore roaster mounted for rotation about a horizontal axis and comprising a cylindrical body portion, frusto-conical end portions joined to such body portion and each having its outer end open, a refractory lining for such body portion, and refractory linings for said frusto-conical end portions; said body portion being provided with a charge and discharge opening in its cylindrical wall, having a length substantially equal to the distance between the refractory linings of the frusto-conical end portions, a door for closing such charge and discharge opening, means for rotating the roaster about its horizontal axis, a water cooled burner extending into the open end of one such frusto-conical end portion, a seal between such burner and such end portion, a stack connection to the open end of the other frusto-conical end portion, and a seal between such stack connection and such end portion.

HARRY L. MCFEATERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 567,848 Campbell Sept, 15, 1896 916,487 Rendall Mar. 30, 1909 1,334,459 Jones Mar. 23, 1920 1,524,397 Jones Jan. 27, 1925 1,712,287 Allen May 7, 1929 1,859,727 Benson May 24, 1929 1,866,668 Protzeller July 12, 1932 2,057,526 Horton Oct. 13, 1936