SE439567B - Direct-current - electric arc furnace or shank - Google Patents

Abstract

The invention refers to a direct-current electric arc furnace or shank for warming, comprised of at least one electric current arc electrode and at least one gauge ring with shank lining. The furnace or shank are thereby characterized by the furnace or shank bottom (1) and even the lowermost parts of the furnace or shank (2) are comprised of tamping clay or non-electric conducting brick, alternating with the layer of electricity conducting pin bars or plates respectively electrical conducting brick, at which the lower part of the bottom and sides widespread bottom contact is achieved.<IMAGE>

Description

15 20 25 , 30 8305683-8 The present invention is a supplement to the subject matter of this application, where the layer closest to the melt may be differently shaped, but the same effect is achieved.

The present invention is characterized in that the oven or ladle bottom and also the lower parts of the oven or sideboard sides consist of stamping compound or electrically non-conductive bricks, alternating with the layer through electrically conductive pins rods or plates, respectively electrically conductive bricks, wherein a the bottom and the lower part of the sides comprising the bottom contact part are obtained.

You get an oven or sideboard through this device, which can be supplemented with one or more electromagnetic stirrers, the fields of which are essentially non-existent affected by the bottom contact. This or these stirrers can suitably be placed ceras next to the sideboard / oven.

The oven or ladle according to the invention is further exemplified in the accompanying figure, showing a ladle (or oven) with at least one arc electrode 12, cathodically connected to a DC power source (not shown). The oven / sideboard can be used for all types of metals or alloys including steel.

Layer 1, directly below the melt 13, consists of electrically conductive bricks, such as magnesite-graphite, alternating with non-conductive bricks. In this layer is obtained good electrical conductivity and at the same time good thermal insulation. Layer 1 can also consist of stamping compound, electrically non-conductive, and provided with the layer walking pins or plates 14 for conducting electric current, i.e. completely according to the just mentioned patent application.

Electrically conductive, possibly sheet-lined, are arranged at the sides of the oven or sideboard brick 2, which layer can also have the composition specified for layer 1.

Eventual; can for layers; 2 bricks with steel sheets were used, nen dess-a sidøskikf included together with layer 1 in the bottom contact.

Under layer 1, a steel plate 3 is arranged with welded steel pins, rods or plates 1U, through the layer 1. The entire bottom contact part 3 can be prefabricated. verknd and designed as a cylindrical plate shape, fitted with fßtßvßtß fl dv pins, rods or plates 14. Between these pins, rods or plates can then electrically non-conductive stamping compound is stamped in the usual manner. In it the cylindrical plate shape includes the side parts 2, covering the lower parts of the inside of the sideboard / oven. A thermal insulator is arranged behind the side partitions 2 of ' Poon eUALITY J » fi ï? .. “ fi f šf, « 15 20 szossss-a and electrically non-conductive layer 8 of dry-stamped magnesite pulp or dyed similar, and behind this layer a heat-insulating and electrically non-conductive layer Y of chamotte bricks or the like. Under the bottom part 1 can be placed one second layer 4, consisting of electrically conductive bricks, such as magnesite fitt brick, coal brick or graphite brick, or also sheet metal lined brick.

Below this layer is placed a usually thicker layer 5 of electrically non-conductive bricks, such as chamotte, mixed with electrically conductive bricks, such as magnesite graphite or graphite bricks. Layer 5 must be able to conduct Current. Below this layer 5, a new layer U of conductive may be placed bricks, similar to the aforementioned layer U. Under this layer H or in contact with layer 5, copper plates 6 or other electrically conductive are placed into one terminal 9, such as a copper terminal 9. This is suitably anodically connected.

The sideboard is provided with a metallic casing 10.

Centrally at the bottom of the sideboard / oven is placed a tap hole, provided with valve or stopper means 11, intended for draining the ladle / oven. IN layer 5, non-conductive bricks can also be provided with conductive sheet metal spacers, for example according to the previously mentioned patent application.

Through the design of the bottom contact part 1-2-IM, provided with the bottom plate 3, space is allowed in or next to the sideboard / oven for one or more electromagnetic agitators 15. Their flows are not affected by the ground contact the parts and customary stirring can take place of the melt 13, for example in purpose of reduction, reduction and / or homogenization. Bottom contact part can thus be kept free from magnetic fields.

The oven / sideboard bottom can be made straight, as in the case shown, or arched, but with upwardly extending side edges.

The invention can be varied in many ways within the scope of the following patent claims.

PQ @ Rfï¿ & UTY , I

Claims (4)

8305683-8 N PATENT REQUIREMENTS A direct current arc furnace or ladle for heating, comprising at least one arc electrode and at least one bottom contact or bottom liner, characterized in that the bottom of the oven or ladle (1) and also the lower parts (2) of the oven or ladle sides consist of stamping compound or electrically non-conductive brick, alternating with the layer through electrically conductive brick, whereby a bottom and the lower part of the sides comprising a bottom contact part (1-2) are obtained. Oven or ladle according to Claim 1, characterized in that a layer (Ä) of electrically conductive brick is arranged below the bottom contact part, and that non-conductive tamping compound (8) is arranged behind the side parts of the bottom contact part. Furnace or ladle according to claims 1-2, characterized in that at or outside the oven / ladle, for example outside the side wall, and above the bottom contact there is space for application of at least one electromagnetic stirrer (15). Oven or ladle according to claims 1-3, characterized in that the bottom contact part (1-2) comprises a prefabricated, cylindrical plate shape (3), the bottom of which is provided with welded-on, vertical conductor plates or rods (14) or pins . rä ”i PÛQR Qfwamv wei?