The influence of plasticity of electrode paste on its quality

The electrode paste is consumed while being roasted in a submerged arc furnace (sintered in an electrode cylinder made of steel plates), hence it is also known as a continuous self baking electrode.
 
The unique roasting and usage methods of electrode paste have very high requirements for its plasticity. If the plasticity is too poor, the electrode paste does not have enough fluidity during the softening process, which cannot fully fill the interior of the electrode cylinder to form a dense whole. After roasting, there are many pores in the electrode, which is prone to "hard fracture" accidents; If the plasticity is too good, during the softening process of the electrode paste, under the pressure generated by its own weight and the escape of volatile substances, the asphalt is prone to migration, causing flow and segregation, which can easily lead to "soft fracture" accidents. Plasticity is a very important indicator of electrode paste.
 
At present, most factories judge the plasticity of the paste based on their actual production experience, adjusting the amount of asphalt added or adding additives to adjust the plasticity of the paste. The plasticity of electrode paste is closely related to its elongation, which can be characterized by elongation. The key to testing the elongation of electrode paste is to press it into a cylindrical shape of specified size, and measure its relative elongation after holding it for 1 hour at a fixed slope of 200 ℃. The experiment studied the plasticity quality of electrode paste by changing the amount of asphalt added and using different additives, and analyzed the relationship between the plasticity of electrode paste and its performance.