US1536654A - Tilting furnace - Google Patents

Description

May 5, 1925. 1,536,654

v. B. BROWNE Filed June 25, 1923 //V VENTOI? wily/5535s v m 6 /amfuwmm Patented-May 5, 1925.

i UNITED STATES PATENT OFFICE.

VERE B. BROWNE, OF BRACKENRIDGE, PENNSYLVANIA, ASSIGNOR TO VALLEY HOLD- ING CORPORATION, OF BRACKENRIDGE, PENNSYLVANIA, A. CORPORATION OF TIL'TING FURNACE.

Application filed June 23, 1923-. serial No. 647,207.

To all 'whom it may concern:

Be it known that I,- VERE B. Baownn, a citizen of the United States, anda resident of Brackenridge, in the county of Allegheny and the State of Pennsylvania, have niade a new and useful invention in Improvements in Tilting Furnaces, of which the following is a specification. I v

This invention relates to the manufacture of steel and those alloys that have a tendency to freeze rapidly as well as those during the refining of which viscous slag is formed.

It is customary in electric furnaces of the tilting type, as Well as in tilting open hearth furnaces, to locate the tap-hole or pouring spout through which the metal is poured from the furnace above the slag line. In such furnaces, the pouring of the metal from the furnace to the ladle is accomplished by merely tilting the furnace and pourlng the slag and metal into the ladle, and in this manner, the sla and metal become intimately mixed, whic. makes it practically impossible to get a complete separation of slag from the metal, and as a result, the metal invariably contains finely divided particles of slag.

An object of this invention is to provide a tilting furnace by means of which the slag and metal can be poured independently from the furnace, so that slag free metal may be obtained.

Another object is to provide a tilting furnae of the electric or open hearth type having two spouts and two tap-holes, one through which the slag can be removed and one through which the slag free metal is poured. V

A further object is to provide a novel method of removing slag free metal from a tilting type of furnace.

These, as well as other-objects which will readily appear to those skilled in the steel making art, I attain by means of the method and furnace described in the specification and illustrated in the drawings accompanying and forming part of this application.

In the drawings, Figure 1 is a view in side sectional elevation, of a furnace embodying this-invention. Fig. 2 is a top plan view illustrating the superimposed spouts and Fi 3 is a sectional view taken on line 33 0 Fig. 1, looking in the direction of the arrows.

For the purpose of illustration, I have shown an electric furnace mounted for tiltmg in a manner similar to the Campbell furnace without any idea, however, of limiting the invention to a specific ty of. tilting furnace. The furnace may e of any well own construction and is provided with a metal pouring spout 4 and a superimposed slag spout 5. These are both preferably lined with suitable material and the slag spout is pivotally mounted at 6-6 on the up-standing sides 7-7 of the metal pouring spout. The slag spout may be removed by means of a chain 8 attached thereto or by any other suitable means. A taphole 9 located well below the slag line is provided for the metal pouring spout 4 and a tap-hole or opening 10 above the slag line is provided for removing the slag during the refining of the metal and if desired, for pouring off a portion of the slag before the refined metal is tapped. During refining of the metal tap-hole 9 will be plugged.

Prior to pouring metal into the ladle, a portion of the slag will be run off through tap-hole or opening 10 and by means of spout 5 will be prevented from coming into contact with the metal pouring spout. The

slag spout may be raised about its pivot point or completely removed, the plug then removed from ta -hole 9 and slag free metal poured into 51c ladle. By this means, I- am enabled to readily separate the metal from the superimposed slag and if the ladle is removed at the proper moment or the furnace tilted back to vertical position at the proper moment, it is possible to obtain al ladle of metal absolutely free from any s ag.

In some cases, it is desirable after all of the metal has been run into the ladle to permit a certain amount of slag to flow on top of the metal in the ladle to form a protective covering for preventing radiation losses. Slag poured onto the metal in the ladle in this manner cannofl become mixed with the underlying metal.

This method of removing the slag before the metal is poured into the ladle is particularly valuable in making certain ferrous alloys such as high chromium steels.

Having thus described my invention, what I claim is 1. A tilting furnace provided with two vertically aligned tap-holes one of which is located below and the other above the slag line and spouts adapted to co-operate with said tap-holes. v

2. A tilting furnace provided with superimposed tap-holes one of which is located below and the other above the slag line, a fixed spout co-operating with the lower of said tap-holes and a movable spout oooperating with the upper of said tap-holes.

3. A tilting furnace provided with superimposed tap-holes, one located at the bot tom of the furnace when tilted and one above the slag line when in normal posi tion, a fixed spout co-operating with the lower of said tap-holes and a removable spout co-operating with the upper of said tap-holes. I

4. A tilting furnace provided with tap holes, one located below and the other above the slagline, a fixed spout cooperating with the lower of said tap holes and a removable spout cooperating with the upper of said tap holes.

5. A tilting furnace provided with superimposed tap holes, one located at the bottom of the furnace when tilted and one above the slag line when in normal position, a fixed. spout cooperating with the lower of said tap holes and a removable spout movably supported upon said fixed spout and cooperating with the upper of said tap holes.

In testimony whereof, I have hereunto subscribed my name this 15th day of June, 1923.

VERE B. nnownn.

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