(1) Calcination. Both petroleum coke and asphalt coke need to be calcined at a temperature of 1350 ℃ to fully remove the volatile matter contained in the carbonaceous raw material and improve the true density, mechanical strength, and conductivity of the coke.

(2) Crushing, screening, and batching. Crush and screen the calcined carbon raw materials into designated size aggregate particles, grind some coke into fine powder, weigh according to the formula, and aggregate to form a dry mixture of various particles.

(3) Mix and knead. Mix and knead the dry mixture of various particles with a certain amount of binder in a heating state to form a plastic paste.

(4) Forming. Under external pressure (extrusion molding) or high-frequency vibration (vibration molding), the paste is pressed into a certain shape and high density of raw electrodes.

(5) Roasting. Place the raw electrode in a specially designed roasting furnace, and use metallurgical coke powder to fill and cover the raw electrode. At a high temperature of around 1250 ℃, the binder is carbonized to form bonded coke, thus producing a non baked carbon electrode.

(6) Impregnation. In order to improve the density and mechanical strength of the electrode product, the roasted electrode is installed in a high-pressure equipment, and the liquid impregnating agent asphalt is pressed into the pores of the electrode. After impregnation, secondary roasting should be carried out. Depending on the performance requirements of the product, sometimes impregnation and secondary roasting need to be repeated 2-3 times.

(7) Graphitization. Install the calcined electrode into a graphitization furnace, cover it with insulation material, and use a heating method that directly generates high temperature by electrification. At a high temperature of 2200-3000 ℃, convert the carbon electrode into a graphite electrode with a graphite crystal structure.