The electrode paste is roasted in the submerged arc furnace
Study on the effect of different coal tar pitch content and additives on the plasticity of electrode paste
The unique baking and use mode of the electrode paste put forward very high requirements for its plasticity. If the plasticity is too poor, the electrode paste does not have enough fluidity during the process of heating and softening, and cannot fully fill the inside of the electrode barrel to form a dense whole. After baking, there are many holes in the electrode, which is prone to “hard breaking” accidents; If the plasticity is too good, during the softening process of the electrode paste, under the pressure generated by its own weight and volatilization, the asphalt is easy to migrate, resulting in paste flow and segregation, and easily leading to “soft break” accidents.
Plasticity is a very important index of electrode paste. At present, most factories judge the plasticity of paste according to their actual production experience, and adjust the plasticity of paste by adjusting the amount of asphalt or adding additives. The plasticity of electrode paste is closely related to its elongation, which can be characterized by elongation. The key point of the electrode paste elongation test is to press it into a cylindrical shape with a specified size, and measure its relative elongation after holding at 200 ℃ for 1 h at a fixed slope. The plastic quality of electrode paste was studied by changing the asphalt content and using different additives, and the relationship between the plasticity of electrode paste and its properties was discussed and analyzed.