GB701082A - Contact arrangements for continuous self-baking electrodes in electric furnaces - Google Patents

Abstract

701,082. Furnace electrodes. ELEKTROKEMISK AKTIESELSKAP. April 18, 1952 [April 20, 1951], No. 9762/52. Class 39 (3). In a continuous self-baking electrode having a lower hard-baked zone 1 of electrode material surmounted permanently or periodically by an upper zone 2 of unbaked material and in which metal contact rods 3 are inserted vertically into the top of the electrode for supply of current to the baked zone 1 into which the rods 3 extend, the contact rods 3 are tapered or of reduced cross section at their lower ends and are surrounded above the baked zone by liquid or fusible electrode material, so that when each rod is raised from its lowest position to a higher position in which its tip still just projects below the top of the baked zone, the liquid electrode material will flow down past the contact rod into the hole left in the baked zone. When the rod is raised, a gap ¢-1¢ ins. width is formed between the rod and the side of the hole. The rod is wholly or at its lower end of frusto-conical shape, the conicity of the rod being between 1:3 and 1:24. The upper part of the rod may be cylindrical and carry a close fitting hollow or solid metal cylindrical sleeve 6 which extends partly into the baked zone when the rod is in its lowest position. The outside diameter of the iron sleeve is 1-3 ins. greaterthan that of the cylindrical rod, the bottom of the sleeve being 10 ins. from the tip of the rod. When there is no layer of liquid electrode material covering the baked zone 1, a funnel 7 is placed around the rod on the baked zone and filled with liquid or fusible electrode material, the bottom of the funnel being closed by the electrode surface. On raising the contact rod the liquid or melted funnel contents flow to fill the hole 4 and bake and bond the tip of the rod in the electrode. Specification 590,250 is referred to.