US 569901 A
Description (OCR text may contain errors)
No Model.) 2 Sheets-Sheet 2. J, L. WELLS,
Nol 569,901. Patented Oct. Z0, 1896.
WW @w .4 TTOHNEYS.
UNITED STATES PATENT OFFICE.
JAMES L. WELLS, OF LEADVILLE, COLORADO.
SPECIFICATION forming part of Letters Patent No. 569,901, dated October 20, 1896.
Application i'iled November 29,1895. Serial No. 570.428. (No model.)
To all whom t may concern:
Be it known that 1, JAMES L. WELLS, of Leadville, in the county of Lake and State of Colorado, have invented a new and Improved Roasting-Furnace, of which the following is a full, clear, and exact description.
The object of the invention is to provide a new and improved roasting furnace arranged to utilize the available heat from the burning ore and to insure a complete roasting at a comparatively low expense.
The invention consists principally of a shaft provided with zigzag flues through which falls the ore to be roasted, and a hotair chamber connected with the lower ends of the tlues to cause hot air to pass upward through the downwardly-moving ore.
The invention further consists of a hearth adapted to receive the ore, an air-chamber divided from said hearth by aperforated bedplate, and a fume-chamber separated from said hearth by a perforated top plate.
The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.
Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding` parts in all the figures.
Figure l is a sectional side elevation of the improvement on the line 1 l of Fig. 3. Fig. 2 is a transverse section of part of the same on the line 2 2 of Fig. l. Fig. 3 is a transverse section of the improvement on the line 3 3 of Fig. 1. Fig. 4 is a longitudinal section of part of the improvement on the line 4 4 of Fig. 3. Fig. 5 is a cross-section of the air supply on the line 5 5 of Fig. 1. Fig. 6 is a transverse section of the hearth and adjacent parts on the line 6 6 in Figs. 1 and 4, and Fig. 7 is a transverse section of the fume or dust chamber on the line 7 7 of Fig. 1.
The improved ore-roasting furnace is provided vvith an inclined hearth A, provided at its lower end with a discharge-hopper B, having a valve B'- for opening said hopper at its bottom from time to time to discharge the roasted ore. The upper end of the inclined hearth A opens into a shaft C, provided with a series of longitudinally-extending hollow partition-walls, D, arranged to form a series of zigzag flues E, terminating a suitable distance below the top of the shaft O, as is plainly illustrated in Figs. 1 and 3.
The top of the shaft C is provided with inlet-openings F, through which the ore in a finely-divided state is discharged into the upper end of the shaft to cause the said ore to fall downward into the zigzag flues E to the lower end of the shaft and upon the inclined hearth A, so that-the latter as well as the hopper B are completely filled with the ore, which latter extends into the lower end of the shaft O, but below the partition-walls D. The latter are formed at their exterior surfaces with V-shaped projections to produce the zigzag viiues and cause the falling ore to turn over in its descent, and permit the hot air moving upward in the shaft, as hereinafter more fully described, to come in contact with all the particles of the downwardlymoving ore. The upper ends of the partitionwalls are peak-shaped, to insure a ready passage of the ore into the ilues.
The bed-plate A' of the hearth A is perforated, as plainly shown in the drawings, and this bed-plate separates the hearth at its under side from an air-chamber G, separated by a solid plate G' from a combustion-chamber i H, parallel to the inclined hearth and the airchamber G. The lower end of the combustion-chamber AH is provided with a suitable fire-box H. Air for the air-chamber G, the combustion-chamber H, and the fire-box H is supplied through an air-supply pipe I, connected with a suitable fan or blower, and having branch pipes I', I2, and I3 leading through the hopper B into the said air-chamber G, combustion-chamber H, and fire-box H', respectively, at the lower ends thereof, as Shown in Fig. 1.
The top of the hearth A is separated from the fume-chamber J by a perforated top plate A2, so that the air from the air-chamber G and heated from the combustion-chamber H passes through the ore filling the hearth A, and passes through said perforated plate A:l into the fume-chamber J to remove the last trace of sulfur or like matter contained in the ore in the hearth A. The upper end of this fume-chamber J opens at J into the zigzag flues E a short distance above the lower IOO ends of the partitiomwalls D, so that the fumes ascend in said fines, together with hot opposite side from that of the fines J. (See Fig. l.) Part of the air in the air-chamber G, rising and passing through the ore in the i upper part of the hearth and the lower part of the shaft (l, passes into the fines to rise therein, so that the fumes as well as the hot air passing up in the shaft are mixed and heat the downwardly-moving ore, so that a preliminary roastin of the latter takes place before the ore reaches the hearth, in which it receives a final roasting in the manner above described.
The mixture of fumes, air, and gases passes at the upper end of the shaft C over the bridgewall C into a suitable chamber L, having an inclined bottom L', leading to inclined passages L?, passing through the bridge-wall C back into the shaft C, near t-he lower end thereof, so that the particles carried up by the fumes and air and settling on the bottom Li slide down the same and through the passages L2 pass back into the shaft C and to the hearth A. The several passages L2 are controlled by a gate L3, pivoted at its upper end and arranged to permit the particles to slide down through the passages, but to prevent the upwardly-1noving air and gases to pass into the settling-chamber L by way of said passages.
Into the settling-chamber L extends from the top a partition N, which terminates at its lower end below the back wall N of the settling-chamber L, said back wall terminating a suitable distance below the top of the fur nace, as plainly indicated in Fig. l, so that the rear end of the settling-chamber L is connected with a chamber O,leading to the smokestack l). In this chamber O are arranged a series of coils of pipe Q, connected with a suitable air supply Q and discharging at their forward ends Q2 into the hot-air chamber K, it being understood that the air in passing through the coils of pipe Q is heated by the gases passing through the chamber O to the smokestack P.
The upper end of the combustion-ehamber .ll leads to a series of flues H2, discharging into the lower open ends of the hollow partition-walls D, so that the smoke and gases from the burning fuel in the fire-box ll', after passing through the said combustion-chamber, pass through the flues H2 into the hollow partition-walls D, which connect at their upper closed ends by openings G2 with a trans- \\*ersely-extending chamber C3, formed in the upper portion of the partition-walls D. The sides of this chamber C3 are provided with outlets C4, leading to the outer air at the top of the furnace, (see Fig. 2,) and the upper ends of the outlets are adapted to be closed by suitable valves C5.
' to be opened by a gate C to an opening UT, i leading to the settlingchamber L'. Then the gate C6 is closed and the valves C5 are open, as shown in Figs. l and 2, then the smoke and gases rising in the hollow partition-walls D and passing into the chamber C3 can pass from the latter to the outer air by way of the outlets C1. lVhen the valves C5 are closed and the gate C is open, then the smoke and gases instead of passin to the outer air pass through the chamber C3 and openings Cinto the settling-chamber L.
Now it will be seen that by the arrangement described the outgoing gases heat the incoming air previous to the latter passing upwardly in the zigzag fines to heat and roast the downward ly-falling ore. A final roasting is given to the ore filling the hearth by the hot air passing through said ore from the hotair chamber G. By passing the smoke and gases from the combustion-chamber through the hollow partitions D, the latter are heated to insure heating of the ore coming in contact with the partitions while passing through the zigzag ilues.
The bottom of the chamber O is inclined, as shown in Fig. 7, and extends through a side wall to the outside to permit the dust that settles in the chamber to be conveniently scraped into a conveyer, cars, or other means on the outside of the furnace at the lower end of the said bottom.
The material composing the plates A and A may be iron or fire-clay, either separately or jointly used.
Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. A roasting-furnace comprising a shaft, an inclined hearth into which discharges said sha-ft, a settling-chain ber connected with the upper end of said shaft and having an inclined bottom, and valved passages leading from said settling-chamber into said shaft, substantially as shown and described.
2. A roasting-furnace comprising a shaft having hollow partition-walls forming vertical flues for the passage of the ore, a hearth connected with the lower end of the said shaft below said partition-walls, a chamber in the upper end of the bridge-wall of the shaft and connected with the upper ends of the hollow walls, valved outlets leading from said chamber to the outer air, a settlingchamber eonnected with the upper end of said shaft, and a valved opening leading from said chamber into said settling-chamber, substantially as shown and described.
3. In a roasting-furnace, a housing, a shaft in the housing, a hearth, a settling-chamber in communication with the shaft, a series of flues arranged in the shaft, and a chamber within the housing, the said chamber being in communication with the atmosphere and with the flues and having a valved opening int-o the settling-chamber, substantially as de- The lower end of the chamber CS-is adapted scribed.
l. A roasting-furnace, comprisinga casing having a shaft and a settling-chamber therein, the settling-chamber having a valved passageinto the shaft, a series of vertically-extending fines having spaces between them and located Within the shaft, a chamber with which the fines have common communication, the chamber having a valved passage into the settling-chamber and beingin communication with the atmosphere, a hearth, and a lire-box, the iire-boX being in communication With the iiues and the hearth with the shaft, substantially as described.
5. A roasting-furnace, comprising a housing having a shaft, a hearth at the lowei` end of the shaft, a fire-box, a series of flues extendin g vertically Within the shaft and having vertical passages between them, the lues being in communication with the fire-box, and a chamber Within the housing, the chamber being in communication with the iues and With the atmosphere, substantially as described.
G. A roasting-furnace, comprising a housing, a shaft Within the housing, a fire-box, a series of vertically-extendin g flues communicating with the iire-box and having vertical spaces between them, the iiues having corrugated sides, and a chamber Within the housing, the cham ber having com munication with the fines and with the atmosphere, substantially as described.
JAMES L. WELLS. lVitn esses A. J. PLUME, E. G. H. ARNOUX.