US591909A

US591909A - Apparatus for roasting and drying ores

Info

Publication number: US591909A
Authority: US
Publication date: 1897-10-19
Anticipated expiration: 1914-10-19

Description

4 Sheets-Sheet 1.

P. ARGALL.

APPARATUS PoR RoAsTING AND DRYING oRBs.

(No Model.)

No. 591,909. Patented Oct. 19,1897.`

@woe/whoa (No Model.) l 4 Sheets- Sheet 2. P. ARGALL.

APPARATUS POB. ROASTING AND DRYING GRES. No. 591,909. Patented Oct. 19,1897.

'(No Model.) 4 Sheets-Sheet 3.

^ P. ARGALL.

APPARATUS FOR ROASTING AND DRYING DRES.

No. 591,909. Patented Oct. 19,1897.

Pm by 17 LE' 6l fbi/Le o l n .nv'no 331A SHO/umd ne: cams Prrtls co. mcrrouma. wAsHmG'rou, n cA (No Model.) 4 Sheets-Sheet 4.

P. ARGALL. APPARATUS FOR ROASTING AND DRYING GRES.

No. 591,909. Patented Oct. 19,1897.

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I INITED STATES PATENT rErcE.

PHILIP ARGALL, OF DENVER, COLORADO.

APPARATUS FOR ROASTING AND DRYING ORES.

SPECIFICATION forming part Of Letters Patent No. 591,909, dated October 19, 1897.

Application filed February 4,1896. Serial No. 577,966. (No model.)

To @ZZ whom it may concern.'

Be it known that I, PHILIP ARGALL, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented a certain new and useful Improvement in Apparatus for Roasting and Drying Ores, of which the following is a speci- 'iicatiorn reference being had therein to the accompanying drawings.

The invention relates to a rotatable tubular furnace for drying ores preparatory to crushing the same for the cyanid, chlorination, or other process where the ores must be crushed in a dry state.

The invention is also used for roasting the dried and pulverized' ore or for the general roasting or calcination of ne ores or furnace products. l

The objection to the rotatable furnaces heretofore in use for roasting ores is that on account of the great diameter of the furnaces the iiame and gases are not brought in intimate contact with the ore. The ore is not thoroughly oxidized because of its insufficient contact or admixture with the air, and, furthermore, the cylinder in such furnaces is always out of balance while being rotated,which necessitates the employment of great and expensive motive power. Again, the loss in dust is heavy, as'the draft carries off large quantities of the fine ore or dust.

The object of my invention is to overcome all these difficulties and provide an apparatus whereby the ore to be treated may be rapidly and perfectly oxidized, the loss of fine ore or dust reduced to a minimum, with the use of but little motive power.

The invention consistsin the novel features of construction of the tubular furnace hereinafter set forth and described, and more particularly pointed out in the claims hereto appended.

Referring to the drawings, Figures l and 1' represent together a longitudinal section of the entire furnace, a portion of which is taken on the lines 1 l of Figs. 2 and 3. Fig. 2 is a view of a transverse section taken on the line 2 2 of Fig. l, showing the parts beyond the sectional plane in elevation. Fig. 3 is a sectional view taken on the line 3 3 of Fig. la. Fig. 4 is a view of a transverse section of the rabble, taken on the line et 4 of Fig. 5. Fig.

5 is a side elevation of the rabble, partly in section, said section being taken on the line 5 5 of Fig. 4. Fig. 6 isa plan view of the rabble, partially broken away.

Like letters refer to like parts throughout the several views.

af, c2, c3, and a4 denote the tubes of the furnace. They are rmlyriveted together at the point of contact and also to the cast-iron center pieces b b, and they are securely attached to the cast-iron rings or track-bands c c', to form, as it were, one tube or a series of tubes which rotate as one tube. These tubes are lined with lire-clay circles d to retain the heat, and are made preferably of steel-plate to make them light in weight. I find in practice that twenty to twenty-six inches is the most suitable inside diameter for these tubes when used for. roasting ores and that the most suitable length is twenty-five to thirty feet for roasting and fifteen to twenty feet when the tubes are employed for drying ores, although I do not hereby intend to limit the invention to tubes of these exact dimensions, nor to limit myself to the use of four tubes, for it is obvious that the dimensions of the tubes may be varied and that more than this number of tubes may be used without departing from the spirit of my invention.

e denotes the smoke-chamber, f the hopper, and g the chute throughwhich the ore is fed into the furnace. At the feed end of the furnace the vtubes Vare joined into one large tube h, which is also lined with fire-clay circles d. This tube h is in the nature of a cap or hood, which fits over and is secured to the ends of the tubes, and at the same time iills up the interstices between the pipes, so that the ore may be properly fed to the tubes.

At the discharge end of the furnace the tubes are preferably joined into one large tube Vz', similar in construction to the large tube h, so that the iiame from the furnace k, which in the drawings is arranged for oil fuel, may readily pass into the tubes.

To supply hot air for drying or oxidizing the ore, one or more fixed hollow rabbles Z are used in each tube. These rabbles are preferably made in one casting, closed at both ends and secured to the inside of the tube by means of the bolts Z. The air is circulated throughithese rabbles bymeans of a fan or IOO other suitable means. The air passes through the supply-pipe m, thence into the air-box n and through the distributing-pipes n', n2, n3,

and n4 into the tube Z2, and having traversed the full length of the tube Z2 passes into the tube Z3 at the fire end of the furnace and emerges through the holes Z4. Over the row of holes Z4 I have shown a projecting ledge or flange, which not only aids in the proper distribution of the ore during aeration, but also protects the outlet air-passages and prevents them from bein g clogged by the shifting mass of ore. The pipe m revolves in the sleeve m and rotates, together with the connections between itself and the rabbles, with the furnace-tubes.

o o' and o2 o3 denote two pairs of carryingwheels, the track-band c resting upon the wheels 0 0, and the track-band c' resting upon the wheels o2 o3. The carrying-wheels are mounted upon suitable bearings, which in turn are mounted upon suitable base-blocks or standards.

The furnace is revolved by means of power transmitted to the carryingwheels 0 02, through the drive-chainp, the sprocket-wheel p', the intermeshing cog-wheels 292193, and the shaft p4, to which the carrying-wheels ol and o2 are rigidly secured.

q is a revolving thrust-bearing mounted upon suitable bearings in the block q', which is securely bolted to the base-blocks or standards.

The capacity of the furnace can be increased or diminished by changing the speed of its revolution or by changing the angle of its inelination.

The under sides of the blocks q2 q2 are provided with a male plate r, adapted to lit into a female plate r on the blocks Q3 g3, thus forming a rocking bearing, which permits the tilting of the furnace and the mechanism for revolving the same without the liability of disarranging the parts.

8 and sare cast-iron frames fastened to the side of the smoke-chamber, and tt' are aprons, elliptical in form, fastened to said frames respectively and extending nearly to and around a portion of the tube h.

s2 and s3 are cast-iron frames fastened to the sides of the furnace 7c, and t2 and 253 are aprons, elliptical in shape, fastened to said frames respectively and extending nearly to and around a portion of the tube t'.

When it is desired to increase or diminish the angle of inclination of the tubes, the base-blocks under and near the feed end of the furnace are raised or lowered and the aprons t, t', 252, and t3 raised or lowered, as the case may be.

justed by jack-screws or any suitable means well known to those skilled in the art, to which I lay no claim. It is to be observed that the furnace is always perfectly balanced, no matter what position the tubes are in, as may be seen from examination of Fig. 3, in

The said angle of inclination is adwhich u represents the ore. The furnace, therefore, requires but little motive power to revolve it, thereby causing a considerable economy. Owing to the small diameter of the tubes, a very great difference in temperature can be obtained between the fire end and the feed end-that is, the re' end can be kept red-hot while the feed end will remain comparatively cool, the heat being absorbed by the ore and moisture when the furnace is used for drying ores, whereas in a singletube furnace the flame would rushl through and heat the cylinder up nearly as hot at the y The operation of the furnace in roasting ore,

in so far as it has not already been described, is as follows: As the furnace revolves the raw ore is fed into the large tube 7L and gradually passes into the small tubes to', co2, a3, and CL4, and thence along them to the discharge end. The small tubes bring the fiame and gases in intimate contact with the ore, while the hollow rabbles at the saine time pass through the charge and eject pure hot air, uncontaminated by the products of combustion, directly into and through the entire mass of ore as the furnace revolves, thus oxidizing and completing the roasting in the most rapid and perfect manner. In drying ores the furnace is operated in a similar manner, except that the ore to be operated upon would be much coarser and the temperature employed would be much lower. I-Iere also the hot air ejected into the body of the oreV as the furnace is revolved rapidly carries oi the moisture and dries the ore more effectually than if it were subjected alone to the action of the iiame and gases of combustion passing over it.

What I claim, and desire to secure by Letters Patent, is-

l. In a roasting or drying furnace, the combination of a plurality of independent noncommunicating cylindrical tubes symmet rically arranged around a common axis, mounted in an inclined position and so as to IOO IIC

be rotated as one, with a combustion-chamj ber sending its products of combustion through all the tubes at once, when all are charged with the material to be operated upon in balanced charges, in conjunction with means provided in each tube for sending pure, hot, dry air through the said charges of ore during rotation, substantially as specied.

2. In a roasting or drying furnace, a revoluble cylinder or tube in combination with a. hollow rabble xed relatively thereto to the interior thereof, and means for supplying air in conjunction with the said rabble to the charge during the process of roasting or drying, substantially as'specified.

3. In a roasting or drying furnace, a revoluble cylinder or tube in combination with a hollow rabble comprising an air-tube having adjacent communicating direct and return flues vwith air-outlet passages leading into the said cylinder, said rabble being fixed relatively to the said revoluble tube to the interior thereof, and means for supplying air to the said rabble during the process of roasting, substantially as specified.

4. In a roasting and drying furnace, a revoluble cylinder or tube in combination with a hollow rabble fixed relatively thereto to the interior thereof; said rabble comprising an air tube having adjacent communicating direct and return fiues with air-outlet passages leading into the said cylinder, means for preventing the air-passages from becoming clogged, and means for supplying air to the said rabble, while the cylinder is revolving, substantially as specified.

5. In a roasting or drying furnace, a revoluble cylinder or tube in combination with a hollow rabble fixed relatively thereto, the said rabble comprising an air-tube having air-outlet passages leading into the said revoluble tube and provided with a projecting ledge or flange, whereby the air-,passages are prevented from becoming clogged, and means 'for supplying air to the said rabble, substantially as specified.

6. In a furnace for roasting and drying ores, the multiple revoluble group of independent cylinders terminating in a single large tube or hood at the feed end of the apparatus, and terminating also in a single tube at the discharge end, in combination with means for revolving said cylinders, means for sending heated gases simultaneously through the same while in revolution, means for feeding ore to the same, and means for sending pure, hot, dry air through the said ore while being simultaneously agitated and heated, substantially as specified.

7. In afurnace for roasting and drying ores, a multiple revoluble group of cylinders provided both at the feed end and at the disthe multiple hollow revoluble group of tubes or cylinders c', a2, a3, a4 in combination with the hollow rabbles Z, iixed relatively thereto one in each tube, having return-passages and outlet-perforations, and means for supplying air in 'conjunction with said rabbles to the ore during the process of drying or roasting, substantially as specified.

9. In a furnace for roasting and drying ores, f v

the multiple hollow revoluble group of tubes or cylinders co', a2, co3, d4 in combination with hollow rabbles Z, one in each tube, fixed to the inside thereof, closed at both ends, having passages Z2, Z3, and perforations Z4, the supply-pipe m, air-box n, distributing-pipes n', n2, n3 and n4, and means for supplying air through the supply-pipe m and the distributing-pipes While the furnace is in operation, substantially as specified.

l0. The combination of a multitubular revoluble cylinder, having a single terminal tube or extension at each end, hollow rabbles, located one in each tube, fixed to the inside thereof, having direct and return passages, and outlet-perforations, means for revolving the said cylinder, means for sending heated products of combustion through all the tubes simultaneously duringrotation, and means for supplying air through the said rabbles and their outlet-perforations to the ore during its agitation while being revolved and heated, all substantially as and for the purpose specified.

In witness whereof I have hereto aiiixed my signature, this 15th day of January, 1896, in

the presence of two witnesses.

PHILIP ARGALL. Witnesses:

E. W. J ENKs, R. H. REID.-