Production method of large-size graphite electrode

Abstract

The invention relates to a production method of a large-size graphite electrode which comprises the components in percentage by weight: 76-79 percent of calcined petroleum coke, 21-24 percent of medium-high temperature modified asphalt and the balance of filling material with the diameter of 0.075-2 mm, wherein the calcined petroleum coke comprises the following components in percentage by weight: not more than 4 percent of granules with the diameter of more than 12 mm, 6-10 percent of granules with the diameter of 8-13 mm, 13-17 percent of granules with the diameter of 4-8 mm, 9-13 percent of granules with the diameter of 2-4 mm and 30-32 percent of powder with the diameter of not more than 0.075 mm according to the particle size distribution; and the coking value of the modified asphalt is over 55 percent and the softening point is 95-100 DEG C. After the raw materials are mixed according to the proportion, the large-size graphite electrode is produced by adopting a conventional process, wherein the mixing temperature is 160-165 DEG C and the thicker lumpiness during the die-filling is less than 40 mm. A huge-size electrode with the diameter of over 960 mm can be produced by adopting the production method of the large-size graphite electrode; meanwhile, the electrode has low resistivity and good conduction property and can bear strong current, thereby enabling the unit consumption and the electricity consumption to be greatly lowered and saving the production cost.

Description

technical field [0001] The invention relates to a production method of electrodes heated by electric discharge, in particular to a production method of graphite electrodes used in electric furnace smelting or industrial silicon electric heating equipment. Background technique [0002] An electrode is a cylindrical object, an important part of an electric furnace for smelting industrial silicon, and a part of a short network. Rely on the electrode to send the low-voltage and high-current delivered by the furnace transformer to the furnace, and through the arc at the end of the electrode, the resistance of the charge and the melt, the electric energy is converted into heat energy for high-temperature smelting. Therefore, in order to keep the electrode in good and stable operation and reduce the occurrence of electrode accidents as much as possible, the electrode needs the following requirements: 1) It has good conductivity, moderate resistivity, and matches the electrical para...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of carbon electrodes caused by various defects in industrial silicon smelting, the invention provides a production method of large-scale graphite electrodes, which solves the problems existing in the current production of graphite electrodes with a diameter greater than 600mm, and can produce ultra-high-power electrodes with a diameter of 960mm. graphite electrode