Carbon equipment products carbon paste products can be divided into two categories, one is conductive materials (such as electrode paste and anode paste); One is used as bonding filler for masonry carbon blocks (such as bottom paste, coarse joint paste and fine joint paste). 1、 Electrode paste, which is an important consumable conductive material for the production of calcium carbide and ferroalloy, is a “self baking electrode” in terms of its use nature. At present, the thermoelectric furnace consumes about 45kg electrode paste for each ton of ferrosilicon containing 75% Si, and about 30kg electrode paste for each ton of calcium carbide.
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 formulas: 1) standard and non-standard electrode pastes: standard electrode pastes are mainly used in open ferroalloy furnaces and medium and small calcium carbide furnaces, and medium temperature asphalt is used as binder; Non standard electrode paste is mainly used in large open calcium carbide furnace.
Its dry material particle composition is the same as that of standard electrode paste. However, in order to appropriately improve the sintering speed of electrode paste, a small amount of tar is added to medium temperature asphalt as binder. 2) Closed paste: this kind of electrode paste is suitable for closed ferroalloy cutting furnace, calcium carbide furnace and other metallurgical furnaces. Anthracite is used as the main raw material for the sealed paste. In order to improve the sintering performance of the electrode paste, a small amount of graphite chips and petroleum coke need to be added, and the binder with low softening point should be used.