Patent ID: 9131538
Filing Date: 2015-09-08
Classification: H01B,H05B

Abstract:
1. An electrode paste of the non-metallic type for obtaining self-baked Soederberg electrodes for the electro-thermal production in submerged arc furnaces of ferro-alloys, consisting of a mixture of: (A) 10-90% by weight, with respect to the weight of the paste, of a binder consisting of a mix of fine graphite and/or anthracite powder having particle size smaller than 0.2 mm for at least 95% of particles in said mix, at least one carbohydrate admixed with a solvent and/or dispersant for said carbohydrate, and optional additives in a total amount between 0.1% and 10% by weight with respect to the total weight of the paste, (B) 90-10% by weight, with respect to the weight of the paste, of a coarse powder of non-metallic grain particles of a material not containing metal, said powder having particle size greater than 0.2 mm, wherein the optional additives are selected from the group consisting of boric acid; silicic acid; phosphoric acid; ammonium phosphate; stearine; saturated, mono-unsaturated or polyunsaturated fatty acids; organic acids; and s mixtures thereof, and said additives are between 1% and 5% with respect to the total weight of the paste when said additives are based on metalloids and transition metals, wherein the coarse powder of (B) is a powder selected from the group consisting of anthracite, graphite, calcined anthracite, calcined graphite, electro-calcined anthracite, electro-calcined graphite and mixtures thereof, and wherein said at least one carbohydrate is selected from the group consisting of monosaccharides, disaccharides, and oligosaccharides.