TH9911B - Lower electrode for DC arc furnaces - Google Patents

Abstract

Lower electrode for DC arc furnaces With a metal rod which was Arrange them on the base plate of the lower electrode. And along with conductive and non-conductive layers which make With high resistance materials inserted between them The upper layer is conductive brick, the middle layer is a homogeneous conductive substrate, and the lower layer is the non-insulating mass. A conductor is fed through the surrounding part of the base plate. In the area of conductive bricks, metal rods are further embedded in the non-conductive mass. In the feeding of inert gas to expel molten metal Through the lower electrode, the metal rod is provided with a central core hole. And at the top there are number of radial holes First, so that the expelled gas can be sprayed in the area of the conductor brick, or a push hole connected to the second expulsion gas pipe is introduced into the lower part of the pre-plastered lower electrode.

Claims (9)

1. Lower electrode for DC arc furnaces with steel plates (2) and one or more metal rods (3). Or a large number of metal plates Arranged vertically in the bottom of the stove, the bottom end of the rod or The plates are loosely fixed in the base plate (4) of the lower electrode (1) with a layer (8,9,10) of Conductor or non-conductor around a metal rod (3) or sheet metal where the middle layer (9) consists of a secondary material. The only conductive page that has the characteristics that The lower electrode (1) is confined to the upper part around the sheet (2) that the metal rod (3) or sheet metal is embedded in the upper layer (8) of the middle conductive mineral material (9). ) Of the conductive homogeneous substrate and the lower (10) layer of the non-conductive insulating material Support on a steel plate (2) 2. The electrodes according to claim 1 having the characteristics that The upper layer of the conductive mineral material (8) is made up of at least half the height of the bottom of the furnace (17). 3. The electrodes according to claim 1 or 2 are characterized by that the metal rod (3) or sheet metal in the conductive layer above (8) is embedded in a non-conductive high temperature resistant material (11) of Low carbon material 4. Any one of the lower electrodes according to claim 1 to 3 has the characteristics that expel gas can be fed into the molten metal (19) through the lower electrode (1). 5. One of the lower electrodes according to claim 1 to 4 is characterized by that the common axis hole (3a) is made in the ingot (3) and the ingot (3) has a gas outlet on the side. Side (3b) 6. The lower electrodes according to claim 5 have the characteristics that Gas outlet (3b) is arranged in an upper layer containing conductive mineral material (8). 7. The lower electrode according to claim 5 having the characteristic that The gas outlet port (3b) is fixed on the top of the ingot (3). 8. The lower electrode according to Claim 1 to 4, any one having the characteristics that The vertical blind holes (13) for the expulsion gas are made in the refractory material (9,10) of the lower electrode (1). 9. The lower electrode according to claim 8 having the characteristics that The lower electrode (1) is segmented. Digested by the vertical metal plate (14) and the adjustable amount of the expulsion gas can be fed into the pressure hole (13) in the subsection one by one through the expulsion gas tube (13a) 1. 0. The lower electrode according to claim 1 has a feature that a conductive high-temperature resistance cover material (12) can be supplied as optionally: The upper layer of refractory (8,11) of the lower electrode (1)