US1035186A

US1035186A - Mechanical ore-roasting furnace.

Info

Publication number: US1035186A
Application number: US63075711A
Authority: US
Inventors: John Harris
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-06-02
Filing date: 1911-06-02
Publication date: 1912-08-13
Anticipated expiration: 1929-08-13

Description

J. HARRIS. MECHANICAL ORE ROASTING FURNACE.

APPLICATION FILED JUNE 2l 1911.

Patented Aug. 13, 1912.

2 SHEETS-SHBET 1.

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J. HARRIS.

MECHANICAL ORE ROASTING I'URNAGE. APPLIoATIoN FILED JUNE 2, 1911.

1,085, 186. R Patented Aug. 13, 1912.

., 2 SHBBTMAEBET 2.

sectional plan taken on. vthe line 2-2 of Fig.

.the drawings.

JOHN HARRIS, OF SH EFFIELD, ENGLAND.

MECHANICAL OREROASTING FURNACE..

1,035,186. Specification of team rama. Patented Aug.. 13,1912.

Application led June 2, 1911. Serial No. 830,757.

Tov all whom it may concern:

Be it known that I, JOHN Harms, a subject of the King of England, residing in Sheflield, in the county of York, England, have invented certain new and useful Improvements in or Relating to Mechanical Ore-Boasting Furnaces, of which the following is a specification.

This invention relates to mechanical ore roasting furnaces and has for its object toy provide improvements in the construction and operation thereof, whereby a portion of the furnace may be cooled for any purpose, such as effecting repairs or renewals, without interfering with the continuous o eration of the remainder of the furnace, and whereby such a cooled portion may be reheatcd without using coal or like fuel. Her'etofore even they smallest breakdown inside has neccssitated the whole furnace being cooled down, and after the repair has been made, the furnace has had to be lighted up again with coal or like fuel, resulting in its being idle for many days or even for two or three weeks. By the employment of the present invention, however, a breakdown can be repaired or a renewal effected with greater ease than heretofore and without stopping the whole furnace, and afterward considerable time is saved in reheating the cooled portion by the hot gases from the remainder of the furnace which has been in continuous operation while the repair or renewal has been made. By the employment of this invention also the dust raised in the furnace is reduced to a minimum with the consequent increase of purity in the acid obtained when dealing withsulfur ores. Means are also provided for enablin when desired, a concentration of heat to ie effected upon, or auxiliary heat to be directed upon a portion of the furnace.

In the accompanying drawingsz-Figure 1 is 'a longitudinal section of a furnace according to this invention, the section being taken on the line 1-1 of Fig. 2 which is a 1. Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2 and Fig. 4 is a trans-Y verse section on the line kwa in Figs. l and 2.

Like letters indicate like parts throughout A\ furnace according. to this-invention is l built in two or more vertical sections, three being shown in the drawings separated by walls A. Each section comprises a plurality of superimposed hearths in the form of arched floors or the like B which thus divide the section into the desired number of tiers or compartments. a pair of vert-ical rake shafts C carryiiuir a rake D in each tier. A space is provided eneath the lowest floor B in each section to form a dust chamber E. One or,n'\ore vertical flues F are provided for each section communicating with the dust chamber E at t-he bottom and with an exit flue or channel Gr at the top leading to the acid forming tower or chimney. 'lhe [lues F of each section also communicate by a suitable port with the uppermost tier thereof and two dampers H and H1 (Figs. 1, 3 and Il) are provided adjacent to such communicating aperture so that the gases from the interior may be led either to the channel Gr or to the dust chamber E by manipulating these dampers. An aperture J controlled by a damper J1 is provided between the dust chamber E and the lowest tier of each section, and similar openings J 2 are also made in the arched floors B separating the various compartments of the section. The apertures J 2 are preferably arranged at alternate ends of successive floors B as shown in Fig. 3, those adjacent to the flue F being conveniently formed by an enlargement of the hole in the floor through which the rake shaft C at this end passes.

In each section there is The rake shafts C are mountedv on suitable p0 pcdestals separated from the interior of the dust chamber by compartments K. The two rakes D in each tier are arranged so that their paths overlap only a comparatively short distance as indicated by the circles Dp in the central section shown in Fig. 2. The ore to be roasted is fed through a suitable feed aperture Lin the roof o the furnace (Fig. 3) adjacent to the center of one of the rakes in theupperinost tier. The blades on this rake are so arranged in relation to its sense of rot-ation that the ore is gradually moved'toward the circumference ofthe rake path, where it comes under the action of the other rake in that tire whdse blades-are arranged to move the ore toward its shaft t0 a yfeed opening L1 adjacent thereto whence the ore passes to the next tier and so on until it ies is finally delivered from the lowermost tier. In Fig. 3 rakes D1 are also shown above the roof of the furnace and in this way the heat of the roof may be employed to dry damp ores.

The dust chambers E communicate with one another by means of ports or passages M (Fig. 2) in the separating walls A. F lues N are provided leading from the series of dust chambers to the acid forming tower on chimney (either directly or by joining the exit flue Gr).

In operation the dampers H are open and H1 and J1 closed, the gases from each sect-ion passing from the uppermost .tier direct to the channel G. If too much dust inds its way through the channel G, the gases from the section or sections causing the dust may be passed through the chambers E in order that the dust may settle therein, by closing the dampers H and opening H1. From the chambers E the gases will pass to the chan` nel G by way of the flues N or their equiva-V lent or through one section by wayof the ports M and opening J. ln case it is desired to permit any section to become cool, as for instance to make repairs or renew some part thereof, the generation of gases therein is prevented by cutting off the vfeed of ore thereto. rilhe cooling maybe, and prefer ably is, expedited by opening the damper* J1 and closing the dampers H and H1 of the section to be cooled, and by opening to their fullest extent the air inlets A1 of that section which, as is well known, it is necessary to provide in all ore roasting furnaces to supply the air necessar for the combustion of the sulfur container in the ore. It will thus be seen that the discontinuance of such section is edected without interfering with the continuous operation of other sections. The cold section or sections may be reheated quickly and easily without the use of coal or like fuel by feeding the ore (slowly at first) and directing the hot gases from the other section or sections through it by clos'- ing the dampers H and opening H1 of the hot section, and opening the dampers J1 and H and closing H1 of the cold sectio'n. The hot gases from the section. in operation will then pass into its dust chamber and thence as indicated on the left hand side of Fig. 2 through the ports M and Jl into and through the various tiers of the cold section and iin ally into the channel G. The rods tying the lower ends of the girders supporting the furnace are preferablyarranged in channels beneath the dust chamber as shown diagrammatically at Q. These channels have one end open to the atmosphere, the other being suitably connected to an air inlet opening of the. furnace. A double advantage is thusq obtained, the current of air passing alonou the' channels to the furnace being delivere thereto in a heated condition andthe tie iary heat is required. This is especially the case with zinc and copper sulid ores which would still retain a small proportion of sulfur if treated simply in the manner described above. To complete the roasting of such ores and thoroughly to eliminate the sulfur therefrom a furnace according to this invention is modified as indicated in Fig. 4 and in the left hand section shown in Fig. 1 by providing a flat false floor O (conveniently of tiles) a short distance above the arched floor B of the lowermost tier, lthis floor B being preferably arranged somewhat farther below the one above it than would otherwise be the case. `The floor O is supported on this arch by a number of transyverse walls extending from one side of the sectiony but not quite reaching the opposite side and alternately arranged so as to provide also a baiiled passage between the lowest arch B and the floor O. At one end Aof the section this passage is opengto one or more of the fiues F a damper P being arranged below sueh openin yor otherwise so that hot gases fromthe ue F may be directed into this passage. At the other end the passage may be provided with a ue leading to the channel G or is as shown open to the port or ports J. In .the latter case two dam ers J1 and J? are 'furnished for the port the upper one J1 is only open to heat the section by the hot gases from other sections, while the lower one J 3 is also used to open a path between the passage under the Hoor O and the dustv chamber E. I It will thus be appreciated that the hot gases emerging from the uppermost tier of a section may be directed through the baliied passage beneath the flat door O in order to provide thev auxiliary heat necessary com- -pletely to eliminate the sulfur from certain ters Patent is What I claim and desire to secure by Leti l. In a roasting furnace of the described the combination of segregated sections thereof, and means for connecting the space above the uppermost hearth of one section with that above the lowermost set forth.

hearthl of another section for the purpose 2. In a roasting furnace of the kind den i scribed the combinationof segregated 'cections thereof, an eX-it flue, a dust chamber, a. passage )between the dust chamber and each sectiomdampers controlling said passages, a flue for each section communicating with the exit ue and with the dust chamber, a port between each section and its flue,

a damper in each section Hue between said ort and the exit Hue and a second damper 1n each section Hue between said port and the dust chamber for the purpose set forth.

3. In a roasting furnace of the kind described the combination of segregated sections thereof each comprising a plurality of superimposed hear'ths, an exit i chamber, a passage between the dust chamber and each section, dampers controlling said passages, a Hue for each section communicating with the exit flue and with the dust chamber, a port between each section and its Hue, a damper in each section Hue between said port and the exit Hue, a second damper in each section Hue bctwccn said port and the dust chamber, an outlet Hue from the dust chamber, a passage below the lowermost hearth in each section and means for supplying heat to said passage for the purpose set forth.

4. In a roasting furnace of the kind dcscribed the combination of segregated sections thereof each comprising a plurality of superimposed hearths, an exit Hue, a dust chamber, a passage between the dust chamber and each section, dampcrs controlling said passages, a Hue for each section communicating with the exit Hue and with the dust chamber, a port between each Section and its Hue, a damper in cach section Hue between said port and the exit Hue, a second damper in each section Hue between said port and the dust chamber, an outlet Hue from the dust chamber, a passage below the lower-most hearth in each section and means for dircctinglthe products of combustion from the section Hue through said passage .to the dust chamber for the purpose set forth.

In testimony whereof I have signed' my name to this speciication in the presence o two subscribing. witnesses.

JOHN HARRIS.

Witnesses ARTHUR Il. GREENWOOD,

Enrri-I A. Pon'rEUs.