US483934A - Zinc-furnace - Google Patents

Description

(No Model.)

0. LUMAGHI', ZINC PURNCE.

No. 483,934 Patented Oct. 4,j 1892.

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UNITED STATES PATENT Orrrcn.

OCTAVIUS LUMA-GHI, OF ST. LOUIS, MISSOURI.

z|Nc-FURNAoE.

SPECIFICATION formingpart of Letters Patent No. 483,934, dated October 4:, 1892.

Application filed November 10, 1891- Serial No. 411,462. (No model.)

To all whom it may concern,.-

Be it known that I, Ocrnvrcs LUMAGHI, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Zinc-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

This is a substitute for the bags used for recovering the oxide from the fumes escaping from reducing furnaces or retorts, the object being to substitute a safe and easy way for collecting the fumes on shelves, and, if preferred, in dust-pans placed therein, so as to avoid all contact with the dust that is necessarily raised in collecting this material from bags, the oxides from these fumes being liable to contain lead and arsenic, so that the health of the operators is very seriously in jured.

The invention consists 'of a furnace having a devious passage for the circulation of the fumes, intercepted by many deflectors and connected to an inclosure which receives the fumes from the retorts. The passage leads from the inclosure to the downtake-liue, then through the horizontal flue or iiues into the lower end of the uptake-flue, and thence out the chimney. The uptake-flue being made of the best conductive. material-such as sheetiron--and being located as near as convenient to the front of the furnace, while the rest of the apparatus is made of less conductive material-such as lumber or brickwork-and located farther from the furnace, the heat radiated from the furnace is promptly transmitted to the heated air and fumes in the up? take-line and their volume so increased that an ascensional force is set in motion to pro-4 l is the furnace, having retorts 2. The furnace formsone wall or part of one wall of a fume-chamber 3, the mouths 2 of the retorts discharging the metallic fumes, dmc., into the chamber. The chamber has a horizontal partition or iioor 4, separating the lower part of the chamber from the upper part 3a. v

5 .is a passageway leading from the lower part of the chamber to the upper part 3a.

6 is the downtake-ue, whose upper end is open to the upper part 3? of the chamber, so that the fumes descend from the upper chamber 3a down the downtake.

7 is the horizontal fine or receiving-box, connecting the lower end of the downtakeflue to the lower end of the uptake-due S, ending in a chimney 9. The uptake-due is near to the furnace,while the downtake-flue is distant `from the furnace, and thus the heat of the furnace produces the current in the due. If the fumes were allowed to pass through the tlues Without any obstruction, the metal sublimate would be carried out through the chimney and so wasted without some other means were provided to recover it. In order to arrest the sublimate, I place deflectors in the iiue. These may be of any suitable form and arrangement; but I have adopted deflectors whose construction will now be described.

l0 is a plate adapted to fit the inside of the flue, except that one side is cut away at 11, leaving a passage through which the fumes pass.

lOa is a plate formed like the plate l0 and connected therewith by a bar l2. Upon the plate 10iL is a standing frame 13, adapted to support another deiiector by the bearing of its lower plate IO upon it. Thus the vertical flues may be iilled or partly lled with the deflectors, as seen in Fig. I, each deiiector composed of the two plates 10 and 10a, connected together by a bar l2 and having the standing frame 13. The delectors are stood one upon another, the lower one being supported on a cross-bar 14, passed through the ue. More or less of these deiectors are used according to circumstances. If it is found that there is waste at the chimney, additional defiectors are put in the flue. By examination of Figs. I and II it will be seen that the position of the plates lOvand 10a are reversed, so that the aperture 11 comes on opposite sides TOO alternately, and thus the fumes have to take a devious track, impinging against each of the plates and 10a as 4they pass through. the iiue. This will cause the metal oxides or sublimate to adhere to the plates, from which it may be dislodged by concussion given to the flues at intervals and Will fall into thev ing device or depositor by a forced or suction draft produced by a fan or other blower or suction device. (Not shown.) lisa pipefrom the chamber, into which the retorts discharge. This pipe is preferably carried down to a coil 16, having one or more turns, and connected at the discharge end With an ascending iiue 17, having goose-neck connection with the interior of the depositing-'chamber 18. The depositing-chamber has vertical partitions 19 and 20, descending from the top and ascendin g from the bottom alternately. The descending partitions stop short of the bottom and the ascending partitions short of the top,

-so that the fumes alternately descend and ascend in the chamber. In addition to the vertical partitions are horizontal deflectors `2l, adapted to receive the impingement lof the fume-curren t, and thus delay its progress and cause the deposit of the sublim-ate or metal oxide upon the dellectors. The deiiectors have a main horizontal part with -a vert-ical flange 21a. Where the currentisdescending the anges extend upward, and Where the current is ascending the lflanges extend downward, so as to form a more effective obstacle to the current. The detlectors yextend from opposite sides alternately of the Walls or the vertical partitions, respectively, 1'9 2O of the depositing-chamber, as seen in Fig. III, so that the current passes from side to side, as indicated by the arrows.

At the proper time for the removal of the deposit access may be had to the inside of the horizontal ilues by removing one of the sidesl of the apparatus that in'closes the iiues, and thus exposing the oxide 4deposited upon the shelves, which may be easily removed, afterj which the side is replaced and the apparatus is again in Working order.

The oxide of zinc obtained by the combustion of the metal in the ore is not homogeneous; but about one-half of itis exceedingly light and very difficult to deposit. To counteract its buoyancy, ali mited amount of steam, just enough to dampen the oxide floating in the current, may be introduced into the current. This Will cause the oxide to settle about as soon as the steam has time to condense into Water and Will afford a cheaper and more satisfactory substitute for the bags now in use for this purpose.

Heat from the furnace which would be otherwise Wasted is made available for starting and maintaining a steady current through the depositing chamber and flues. The fact that floating bodies are more easily'deposited when taken horizontally is made use of in the form of apparatus shown in Fig. III.

This invention can be used to gather the fumes or smoke from any kind of furnace Whenever valuable matter is prese-nt.

I claim as my invention- 1. In combination with a flue f-or collecting fumes, a series of removable deflectors, each having two plates 10 10a with recesses upon the opposite sides, a bar connecting the plates, and a standing frame secured upon the plate 10n and adapted to support another deflec-tor, as set forth.

2. In a zinc-sublimin-g furnace, the combination of the retorts,a passage incommunication with the retorts and containing deiectors adapted to receive deposits of the metallic oxide, a-nd an ascending flue in connection with the discharging end of such passage and in proximity -to the retorts, so as to cause an upward current through such fine, substantially as set forth.

3. The combination, in a zinc-sublimi-ng 9 furnace, yof the retorts, a chamber for receiving the metallic fumes from the retorts, a passage containing detlectors, having an induction end open to said'chamber and an ascending flue at the eduction end in proximity to the retorts, for the purpose set forth.

GCTAVIUS LUMAGHI.

Witnesses:

SAML. KNIGHT, J. M. MAROT.

ICO

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