US1000321A - Rotary furnace. - Google Patents

Description

I. L. BRIGGS.

ROTARY FURNAOE.

APPLICATION FILED JAN. 30, 1911. I

1,000,321. Patented Aug. 8, 1911.

III

STES ATNT OFFICE.

IRVING L. BRIGGS, OF CLARKSBURG, WEST VIRGINIA, ASSIGNOR TO LILLIE PEARLMAN, 0F PHILADELPHIA, PENNSYLVANIA.

ROTARY FURNACE.

Application filed January 30, 1911.

To all whom it may concern:

Be it known that I, IRVING L. BRIGGS, a citizen of the United States, residing at Clarksburg, in the county of Harrison and State of Vest Virginia, have invented certain new and useful Improvements in R0- tary Furnaces, of which the following is a specification, reference being had to the accompanying drawings.

This invention is an improved rotary furnace for use for reducing and refining metals, and consists in the construction, combination and arrangement of devices, hereinafter described and claimed.

In the accompanying drawings-Figure 1 is a vertical longitudinal central sectional view of a rotary furnace constructed in ac cordance with my invention. Fig. 2 is a front elevation of the same.

The furnace body 1 is cylindrical in form, and'is provided at its front end with an annular circumferential enlargement 2, and near its rear end with a similar enlargement 3, the diameter of which is less than that of the enlargement 2. The annular enlargement 2 is hollowed on its inner side to form an annular chamber 4, which communicates with the interior of the body of the furnace, and the annular enlargement 3 is also hollowed on its inner side to form a similar annular chamber 5, the diameter of which is less than that of the chamber 4. An opening 6 is at the front end of the furnace body, a similar but'smaller opening 7 is at the rear end thereof. The furnace body comprises a shell 8 which in practice is preferably made of steel about half an inch thick and a lining 9 on the inner side of the said shell, and which in practice is usually made of fire brick, but may be made of any other suitable refractory material. The furnace body is mounted in a horizontal position, and owing to the difierence in the diameter of the annular chambers 4, 5, and the openings 6, 7 there is a fall from the lower side of the opening 7 to the lower side of the opening 6, and the bottom of the chamber 4 is lower than that of the chamber 5 as will be understood.

The enlargements of the furnace body are respectively provided with circumferentially disposed annular track rails 10, 11, and the central portion of the body of the furnace is also provided with a similar annular track rail 12. The rail 10 bears upon Specification of Letters Patent.

Patented Aug. 8, 1911.

Serial No. 605,499.

a pair of peripheral channeled rollers 13 which are mounted in the bearings 14 of pillow blocks 15. The shafts of the said {rollers are provided with worm wheels 16 10f the furnace is supported at its ends and at its center upon the rollers and is adapted to be revolved.

In practice the driving shaft 18 is operatedat such speed as to cause the furnace body to be revolved once in about four minutes.

The intake hood 23 of the stack 24 is disposed atand above the opening 7 at the rear end of the furnace body.

In the operation of my invention, the charge is introduced into the furnace through the opening 7, and the furnace is gas fired through the opening 6. Slow rotation of the furnace causes all the particles of the charge to turn and exposes all the particles to the action of the blast. More over, the rotation of the furnace together with the fall from the lower side of the opening 7 to that of the opening 6 causes the charge to move from the opening 7 to the opening 6. The metal which is sweated out or melted from the charge flows into the annular chamber 4 from which it may be ladled and poured in ingots or slabs as the case may be, while the impurities are oxidized and discharged at the opening 6.

The annular chamber 5 at the charging end of the furnace serves to retain the metal until the same is in the molten state when the addition of another charge causes the molten metal to flow from the chamber 5 toward the larger chamber 4, thus making the process of reducing the metal continuous. The rotation of the furnace exposes the flowing metal to the oxidizing influence of the gases, purification taking place in the chamber 9, between the chambers 4 and 5. When the metal arrives in the chamber 4, it is in the pure state, the impurities having been oxidized during its passage from the chamber 5 to the chamber 4. The metal is ladled from the chamber 4 and run in molds to form slabs or pigs as the case may be. As the result of the operation of my furnace,

a metal of high purity is recovered from the ore at very low cost. My improved furnace is also adapted for the preparation of ores for subsequent treatment, and for the production of red lead, and litharge.

In Fig. 1 I show a gas pipe 25 the lower end of which extends slightly into the fur nace through the opening 6, and is provided with a cross branch 26 which has downwardly and inwardly directed nipples 27 to discharge burning gas jets into and through the furnace. The gas pipe is also provided with a gas regulating valve 28.

If the furnace is to be fired with fuel, a removable fire box will be provided, and connected to the furnace at 6.

I claim 1. The herein described rotary furnace comprising a cylindrical main portion, annular circumferential chambers at the ends of and communicating with the main portion and forming diametrical enlargements of the furnace, one of the said chambers being of greater diameter than the other, the said furnace being provided at its ends with openings, the diameter of the opening at the end of the furnace provided with the larger chamber being greater than that of the opening at the end of the furnace provided with" the smaller chamber.-

2. The herein described rotary furnace comprlslng a cyllndrlcal maln portion, an-

nular circumferential chambers at the ends having its intake arranged at the smaller opening of the furnace.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

IRVING L. BRIGGS.

WVitnesses:

JAMES O. WHITENER, HARRY L. BRIGGS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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