US948098A - Smelting-furnace. - Google Patents

Description

J. s. LODER.

SMELTING FURNACE.

APPLIUATION FILED. AFB. 4, 1908.

Patented Feb. 1, 1910.

2 SHEETS-SHEET 1.

wi/tmaooe J. S. LODER.

SMELTING FURNACE. APPLIOATION FILED ABBA, 1908. 948,098 Patented Feb. 1,1910.

2 SHEETS-SHEET 2- UNITED STATES PATENT OFFICE.

JOHN S. LODER, F RENO, NEVADA, ASSIGNOR T o LODER SHELTER &

OF RENO, NEVADA, A CORPORATION OF NEVADA.

BEFINER (30.,

SMELTING-FURNACE.

arenas.

Specification of Letters Patent.

Patented Feb. 1, 1910.

To all whom it may concern:

Be it known that I, JOHN S. LODER, a citizen of the United States, residing at Reno, in the county of Washoe and State of Nevada, have invented certain new and useful Improvements in smelting-Furnaces, of which the following is a specification.

This invention relates 'to the smelting of ores andhas articular reference to the vertical type of urnace. It embodies a vertical furnace of novel construction which is not heated by solid fuel of any which has the fuel su plied in fluid form through burners near tli e bottom of the furnace. The'fuel as well as all of the air used to support combustion is supplied under high pressure and results in supporting the ore 1n the furnace above the combustion space.

My invention includes this novel process of operating furnacesof the vertical type.

Some of the broad features of my invention are disclosed in my application 335,094, tiled SeptemberlS, 1906. 4

In the accompanying drawings, Figure l is an end View partly in section of a furnace embodying my invention; Fig. 2 is a side view of the furnace; and Fig. 3 is a detail of the burner.

My furnace embodies an upper section made up of the vertical refractory walls 1 which are built in the usual way, and which are supported on the angle irons 2 carried by the pillars 3. This upper section has an outlet 5 for products of combustion and an inlet door 4 for the admission of theore to be treated. Below the lower open end of the upper section there is'placed a funnelshaped lower section 6 made of metal and provided with double walls havin a space between them to receive a coolin fluid such as water. The upper end of this funnelshaped section fits closely against the angle bars 2, and therefore constitutes a continuation of the walls of the upper section. The

inner wall of the funnel-shaped section has a shoulder or bulge 7 at the point Where the tapered portion joins the straight sidedportion. This shoulder 7 projecting into the furnace assists in supporting the ore at that point.

The bottom of the funnel-shaped section is supported on a plate 8, which plate is covered within the furnace by refractory material 9, and this constitutes the floor of the furnace on which the melted materiallower part.

kind, but

.that consequently the section 6 may be clamped ti htly between that plate and the bottom of t e upper section. It will further be noted that this construction produces a furnace which is practically air-tight at its Below the shoulder 7 burners 12 enter the furnace, and .these burners are supplied with gas for reducin by ipes 13 and with oil for natteing throug pipes 14. The air necessary to support combustion is supplied through pipes 15, and it is to be understood that meansare provided for supplying the fuel and the air to said pipes under high pressure ranging from thirty to sixty pounds to the square inch.

At the bottom of section 6 and on a level with the bottom of the furnace there is a pipe 16 extending throu h the double walls constituting an outlet fhr the melted material witliin the furnace. Constituting a continuation of this pipe there is a water cooled extension 17 U-shaped in vertical transverse sect-ion which registers with the inlet opening 18 of the outside car 19. This car 19 is mounted on wheels 20 so that it may be easily removed for purposes of repair, and it is also provided with a spout 21 at the top for the discharge of slag. A water cooled discharge opening 22 for the melted metal is provided in the side of the car. The Water for cooling the section 6 and the discharge spouts is supplied through the main pipe 23 and branches 24, 25 and 26, and the Water which has been heated is led away by the branches 27,28 and 29. The pipes 25 and 28 may be flexible so as to permlt movement of the receptacle 19 or they may be provided with joints which are easily disconnected. It will be understood that the outlets 16 and 22 are to be closed in the usual way such as by the use of clay. It will also be understood that the burners 12 may be made adjustable as in my prior application.

The particular. form of furnace shown is long and comparatively thin and is similarly constructed on both sides, having the same inlets and outlets.

In operation the ore char ed into the upper part of the furnace stri es the inclined portion of the section 6 and the shoulder 7 burners 12. It is apparent that by this structure and methoo of operation there is a free combustion space in the bottom of the furnace immediately beneath the ore, so that the flame plays on the'bottom of the ore gradually melting the ore, which at once falls to the floor 9. 'By this means combus-.

tion is localized where the operator may observe its operation through the sight opening, and may control it with great accuracy. This accurate regulation and means for observing the condltion of the material at all times is not possible where solid fuel is used in the furnace, since that fuel is distributed over a larger area and the flame extends for some distance up the furnace. The use of as as fuel furthermore avoids the noxious umes and gases which result from burning solid fuel in furnaces of this kind.

While the use of gas as the fuel has obvious advantages in the vertical type of smelting furnaces it was not possible to use it practically in the lower part of the furnace until means had been devised for supporting the ore'above it, leaving a free comustion-space. Furthermore even where the ore was supported above the burner the apparatus was liable tobecome choked by the melted metal, and it was to avoid these difficulties that the present system and method of operation under high pressure in a closed furnace was devised.

.By drawing off the melted ores into the receptacle outside of the furnace and allow-, ing them to settle and separate there I avoid the objectionable agitation which necessarily takes place if it is attempted to perform the separation within the furnace.

. Having thus'described the invention, what is claimed is: I

1. The combination in a vertical smelting furnace having a normally closed bottom adapted to receive and maintain gas under pressure, of inwardly inclined sections of the walls of said furnace above the bottom, a shoulder or bulge at the bottom of said inclined sections, burners below said bulge, and means for supplying air and fuel to said burners under pressure.

2. In a smeltin furnace the combination with vertical re ractory walls havin an inlet for material and an outlet for pro nets of combustion near the top, of an inwardly tapering double walled metal continuation of said refractory walls, means for sup lying a cooling fluid between said double we 5, an inwardl extending bulge on the inner wall at the bottom of said tapering portion, a closed combustion chamber below said bulge, burners discharging into said combustion chamber, and means for supplying air and gas under pressure to said burners.

3. A vertical smelting furnace having a tapering lower portion provided with an inwardly projecting bulge or shoulder at the bottom of said ta erin portion, an outlet for the products of com ustion at the upper part of said furnace, means for'supplymg ore. thereto, a parallel-sided air tight combustion chamber below said bulge provided with a floor for receiving molten metal, burners extending into said combustion chamber, pipes for supplying air and as to said burners under pressure in su cient quantity to support combustion, and means for drawing oil the molten material from the bottom of said combustion chamber.

4. A vertical smelting furnace having an inwardly tapering double-walled lower ortion, means for supplying a coolin fiui between said double-walls, an inward y extending bulge on the inner wall at the bottom of said tapering portion, a combustion chamber below said bulge, and means for supplying fuel to said chamber.

5. A vertical smeltin furnace having an inwardly tapering doub e-walled lower ortion, means for supplying a cooling flui between said double walls, an inwardly extending bulge on the inner wall at the bottom of sad tapering portion, an air-tight combustion chamber below said bulge, burners discharging into said combustion chamber, and means for supplying air and gas under pressure to said urners.

-In testimony whereof I afiix my signature in presence of two witnesses.

JOHN S. LODER.

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