US654335A - Roasting-furnace. - Google Patents

Description

No. 654,335. Patented lu-ly 24,' |900.

Y U. WEDGE.

RQASTING FUBNAGE.

(Application led Mar. 13| 1899.)

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i-rTED u STATES' PATENT Orrin.

UTLEY WEDGE, or BAYONNE, NEW JERSEY.

.aoAsTiNc-FURNAQE.

SPECIFICATION forming part `of Letters Fatent No. 654,335, dated July 24, 1900. Application filed March 13,1899. Serial No. 708,806. (No model.)

To @Uu/homA it may concern: V

Be it known that I, UTLEY WEDGE, a citizon of the United States, residing at Bayonne, in the county of Hudson nand State of New Jersey, have invented certain new and useful Improvements in Roasting-Furnaces; and I do hereby declare the following' to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thel same.

My invention relates to improvements in furnaces for roasting, calcining,oxidizing,and like operations, the object being to improve the construction of the furnace and obtain better results in its operation; and the invention consists in the novel features of construction, combination, 4and arrangement of the various parts for coaction 'to produce such results, all as hereinafter described, and set forth in the claims. l

In the drawings, Figure 1 represents in cen tral vertical section afurnace in the construction of which my invention is embraced. Fig. 2 represents a horizontal section through one of the furnace-chambers of the furnace shown in Fig. 1, the plane of section being indicated by the broken linen: in Fig; l. Fig. 3 represents a central Vertical section of a furnace embracing certain 4modifications of construction. Fig. 4 is a horizontal section through the furnace shown in Fig. 3,`taken en the plane indicated by the broken line y y on Fig. 3. Fig. 5 is a horizontal section 4through the furnace shown in Fig. l, taken on the plane indicated by the broken line w won Fig. l; and Fig. 6 is a like section through vthe furnace shown in Fig. 3, taken on the broken line a e' on Fig. Fig. 7 is a horizontal section on the same plane as Fig. 5, but illustrating a modified construction wherein the passages from one roasting-chamber to the next are carried outside of the furnace-chambers. Fig. 8 is a vertical sectional detailon the plane indicated by the broken line n fu on Fig. 7, illustrating more clearly the construction shown in Fig. 7. Fig. 9 is a sectional detail through one of the passages g, taken on line u u of Fig. 2; and Fig. l0 is a detail showing more clearly the connection of the stirring-arms to 5o the shaft and the arrangement of the stirringblades.

The furnace is constructed with chambers in a tier one above the other, forming what is nace, andl is provided with a central vertical shaft carrying horizontal stirring-arms in the several roasting-chambers, by the rotation of which the material under treatment is continuously stirred and moved so as to pass from 6o chamber to chamber until it is finished and discharged. i

My improved furnace is adapted to such o'perations as drying, desulfurizing,chloridizing, oxidizing, roasting, or calcining ores, mattes, metallic bodies, orcom pou nds, oxids or other crushed, ground, or comminuted materials; but for convenience I shall describe the operation' of roating ores or sulds-such, for instance, as pyrites iines-it being under-v 7o stood thatwherever I use the term roasting such operations as chloridizing,oxidizin g,dry ing, tc., are also included.

The furnace comprises the tower-like structure A, of` brick or other suitable refractory material, `divided into roasting-chambers a a2 CL3, dac., as many as are required. A central vertical shaft B is provided in each' of the chambers a 0,2 a3, dro., with oneyor more arms h, carrying stirring-blades b2, which ext-end so 8o near the floor of the chamber as to just have sufficient clearance and are set at such an angle to the arm which carries them as to pass the material on the floor outward or inward toward the passage into the next lower roasting-chamber, as'seen in Figs. 5 and 6, where the inclination of the blades b2 is indicated by the dotted lines on the arms l). The arms b are preferably attached to the shaft B by to flanges b4, formed on short lateral branches b of the shaft B, as best seen in Fig. lO.

In some roasting operations the material itself has not sufficient combustible constituents to effect its own` roasting, and in such cases it is necessary to supply some heat additional to that generated by theroasting ore itself. This has been done by arranging furcommonly called a tower7 or turret fur- 55 being bolted through flanges b3 on the arm b 9o i naces in connection with the roasting chambers and burning fuel in such furnaces, the combustion-gases from the furnaces passing into and through the roasting-chambers and commingling with the gases given off by the `roasting material. In many cases, however, this mingling of combustion-gases with the gases from the roasting material is very deleterious and even fatal to the operation. It' the 1o sulfurous gases from sulid ores are to be used in manufacturing sulfuric acid or sulfates,

the presence of the carbonaceous combustiongases is extremely objectionable, while in many operations-such as-the dead-roasting I5 of ores, &c.the presence of such carbona- Ceous gases in the roasting or oxidizing charnber atthe high temperature employed exerts a reducing effect upon the material and very seriously interferes with the operation and zo also impairs the quality of the product. A further objection to `such mingling of the gases in the roasting-chambers is thatin many cases the material contains more or less dust,which is of value, and the increased volume of gases z 5 passing through the roasting-chambers carries out more of this dust than would otherwise be taken up, and some portion of the dust so carried out is not recovered in the dust-chamber, but is lost.

Tosupply the heat necessary to supplement that generated by the combustion of the material itself or to supply the heat required when the material is not itself combustible, I interpose between the roasting-chambers one or more furnace-chambers, preferably alternating the furnace-chambers c c2, &c., with the roasting-chambers ct d2 d3, &.c., as shown in Figs. l and 3. The furnace-chambers may be more or less in number than the roastingchambers, and two, three, or v more of the roasting-chambers may intervene between the furnace-chambers, as the nature of the material treated may require; butfor most purposes the alternate arrangement shown is to be preferred. The furnace chambers are heated by any preferred means-as furnaces C, oil-burners d CZ, or gas-burners e-as I do not limit myself to any specific mode of heating. The combustion-gases from one furnace-chamber are preferably passed by a fl ue, as c6, to the next furnace-chamber, thus further' utilizing the heat of the combustiongases, and from the last furnace-chamber the combustion-gases pass, as by flue '05, to the 5 5 stack f. In any case the gases may be passed to any device, as a boiler or feed-water heater, for utilizing their waste heat instead of passing them to the stack.

The shaft B is protected where it passes through the furnace-chambers by a wall c7, of masonry, built around it, and a wall cs, of masonry, incloses the passages g g2, through which the material is passed from one roasting-chamber to the next, as seen in Figs. 1,

2, and 4, or the passages g may be formed in the outer wall of the furnace A without passing through the intervening furnace-charnber, as shown at g3 in Figs. 7 and'S.

The material to be treated is fed by any su itable feeding device-such, for instance, as the 7o hopper B and conveyer h-into the upper roasting-chamber through an inlet t', and from thelower chamber an outlet j delivers the finished product into cars lo or into bins or other desired receptacle; From the upper chamber a gas-flue Z conducts the gases thrown oif from the material to any desired place of disposition, such as acid-chambers, dust-chambers, &c.

By the construction I have shown and de- 8o scribed it will be seen that n-one of the-combustion-gases are allowed to enter the roasting-chambers, but each kind of gases isv kept separate and separately utilized and disposed of. between two of, the roasting-chambers heats both of the latter chambers by the sam-e expenditure of fuel which would be required. to heat one only, and this effect is increased by utilizing in the upper chambers the waste 9o heat of the gases from the lower chambers.

The shaft B, which may be of any usual or suitable construction, is supported at the bottom, as by the step n, and is rotated by any suitable means-such, for instance, as the 95 gear m and driven gear m2. Doors d afford access to the various chambers for any desired purpose-such as inspection, sampling, adding reagents, or making repairs-and through these doors air can be admitted, if roo desired, at any point and in any quantity required, or the air can be entirely excluded,-if the particular operation may require. The gases given off by the material pass up from chamber to chamber through the passages g g2 and out of iiue Z, the course of the gases being indicated by light arrows. The course of the combustion-gases is in like manner indicated by heavy arrows.

p represents a damper in the stack f for 11o controlling the combustion products and regulating the draft and heat in the furnacechambers, as may be required.

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

1. In a roasting-furnace the combination of a tier of roasting-chambe1's,.furnace-chambers interposed in the series of roasting-chambers and not communicating therewith, but so communicating with each other that the com- 12o bustion products of one furnace-chamber are conducted into another, passages connecting the roasting-chambers with each other, whereby the material'in the roasting-chambers may be passed from chamber to chamber out of 125 contact with any gases other than those generated therein, and stirring mechanism in each roasting-chamber, substantially as described.

2. In a turret-furnace the combination of 13ov The interposin g of the furnace-chambers 85 oom munioating with the intervening fnrnaee- 1o chamber, and means for rotating said shaft, substantially as described.

In testimony whereof I hereto affix my signature in presence of two Witnesses.

UTLEY WEIDGE.

VvTitnesses:

CHAS. E. ANNETT, M. P. STRINGHAM.

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