US1217306A - Electric-furnace-wall construction. - Google Patents

Description

UNITED STATES PATENT OFFICE.

ING-ENUIN I-IECI-IENIBLEIKNER, OF CHARLOTTE, NORTH CAROLINA, ASSIGNOR TO SOUTHERN ELECTRO-CHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORA- TION OF NEW JERSEY.

ELECTRIC-FURNACE-WALL CONSTRUCTION.

Specification of Letters Patent.V 'Patented Feb, 27, 191 '7.

Original application led November 2, 1914,-Serial No. 869,8301 Divided and this application filed September 27,1915. ser'ia1No.52,sca. l

To allwkom t may concern Be it known that I, INGENUIN HEGHEN- BLEIKNER, a subject of the Emperor of Austria-Hungary,and resident of Charlotte, in the State of North Carolina, United States of America,'haveinvented certain new and useful Improvements in Electric-Furnace- Wall Construction, lof which the following is the specification. i This invention relates l,to improvements in electric furnace wall construction and is especially designed for luse in connection with the treatment of phosphate rock to eX- pel phosphoric acid, and the objects of the invention are to overcome the peculiar diliculties present by the extremely high temperature of the slag formed in this process, and it consists essentially of the improved construction hereinafter described in detail in the accompanying specification and drawing.

The drawing shows a vertical section through an embodiment of the invention.

The details of the electrodes and other features of the furnace constructed apart from the walls thereof are shown in my application Serial No. 869,830, filed November 2nd, 1914, of which this is a division.

The electric furnace itself may, in the present invention, be said to consist of three parts comprising the bottom section A, the tapered stack section B and the outlet elbow C. These parts are detachably connected and fit together, the detachable convnection between the bottom portion and tapered stack section being effected by abut.

ting channel sections 10 and 11 which are bolted or otherwise clamped together while the detachable .connection between the taypered stack section and the elbow section is effected by similar channel steel sections 12 and 13 which are similarly connected together. l

The bottom section A is water-cooled and is, in fact, practically in the form ofa water jacket, being formed with inner and outer walls 14. and 15 of thin sheet metal separated and connected together by I-beams 16 or the like and having means for circulating water in the interior and distributing the same equally therethrough.

To eect an even distribution of water an annular outlet channel 17 is formed around the top on the exterior into .which `equally -distributed overflow pipes 18 are ,arranged to discharge, such overflow pipes extending in a radial direction from the interior of the water acket. t

The inflowing water is adapted to.- pass through a conduit 19 which opensv at the topy of the water acket. The furnace is originally constructed without any lining in the bottom section whatever. The water jacket, however',l being considerably cooler than the slag-formed within the, furnace will cause a portion of the slag to freeze tothe inner wall of the water'jacket to thereby form a liningD of frozen slag. s

It is found that a lining of this character is .the only one which will resist the action of the calcium lsilicate slag; It is impracticable to use any form of fire-brick or other lining generally used in electric furnaces, owing to the fact that such lining will be readily attacked by the phosphoric' acid and calcium. silicateslag.

The body portion rests on suitable transverse'bearings 2O conveniently formed of wood or like' insulating material. Onv one side ofthe body portion a slag overflow E is provided which is kept open during the operation and which is so arranged that the molten slag seals `the furnace.

Suitable manholes 25 arfI also formed around the body portion having' water cooled doors 26, the inner sides of the water cooled doors being covered with a layer of frozenI slag.

The tapered section B of the furnace is not water cooled and is adpated to carry the electrodes-F which extend in an inclined direction through it.

The electrodes and the holders and means vfor adjusting the electrodes do not form part of the present invention and are disz pelled lfrom the furnace gases will be suitably oxidized and caught b v suitable abs0rption towers, such for example as those shown in my United States Patent Number 1,112,211, granted on September 29th-1914.

The walls of the body portion will be effectively 4protected from the action of the slag and phosphoric acid by the layer of molten Slag which will form on it.

In the process as above described a comparatively high voltage (say in the neighborhood of 300 volts) is necessary for a successful operation, and experiments made have proved that it is impossible to use any type of well known furnace lining with a voltage as high as this and with a slag having the high temperature of the calcium silicate slag produced in the process. Itis found, however, that the water cooled furnace walls chill the slag to form an effective protective coating as above described.

What I claim as my invention is:

1. An electric furnace comprising a water cooled body, a non-water cooled tapered portion connected to the body portion, a non-water cooled elbow section connected to the tapered portion, and a lining of chilledslag,- of substantially uniform thickness for. both the water cooled and nonwater cooled parts. f l

2. An electric furnace comprising a water cooled body portion, a lining of chilled slag extending` completely around the sides and over the bottom of the body portion, a tapered portion fitting on the body portion, a detachable connection between the tapered portion 'and body portion formed by channel steel sections bolted together, and an elbow section connected to the tapered section, a pair of channel steel sections forming the connection between the tapered section and the elbow section.

In witness whereof I have hereunto set my hand in the presence of two witnesses,

INGENUIN HECIIENBLEIKNER. Witnesses:

D. C. CARMIGHAEL,

A.. M. HWEBB.

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