The main raw materials for producing electrodes are anthracite, metallurgical coke and coal and coal tar pitch, which can be divided into two categories according to different formulations:
1. Standard and non-standard electrode paste: standard electrode paste is mainly used for open ferroalloy furnace and medium and small calcium carbide furnace, and medium temperature asphalt is used as binder; The non-standard electrode paste is mainly used in large open calcium carbide furnace. Its dry material particle composition is the same as that of the standard electrode paste. However, in order to properly improve the sintering speed of the electrode paste, a small amount of tar is added to the medium temperature asphalt as a binder.
2. Airtight paste: this kind of electrode paste is suitable for airtight ferroalloy chopping furnace, carbide furnace and other metallurgical furnaces. Anthracite is used as the main raw material for the closed paste. In order to improve the sintering performance of the electrode paste, a small amount of graphite chips and petroleum coke should be added, and a low softening point binder should be used.