Molding characteristics of electrode paste products
As a type of carbon product, electrode paste products have both commonalities and unique characteristics in their molding process. The uniqueness of the molding process of electrode paste products is mainly determined by the product performance. Electrode paste is the raw material for self-baking electrodes, and its baking process is completed in calcium carbide and ferroalloy submerged arc furnaces. That is to say, the baking speed and time of electrode paste are variable and determined by the furnace type, smelting variety, geometric and electrical parameters of the submerged arc furnace. The variability of baking speed and time allows for a wide variety of models for the volatile and plastic properties of electrode paste products. Most electrode paste products have much higher volatile content than general carbon products, which determines that it is difficult or unnecessary to use vibration molding and isostatic pressing molding for electrode paste products. Instead, mainly using molding and extrusion molding. Extrusion molding and general carbon product performance are basically the same, but due to the continuity and large quantity of electrode paste product production, well-known domestic electrode paste manufacturers basically use a similar molding process. The so-called similar molding process refers to having the characteristics of molding but not traditional molding. The pressure is not transmitted by external pressure heads, but mainly relies on its own weight to pressurize the lower electrode paste products. The model continuously moves at the bottom to form a series of molded blocks.
The advantage of this molding method is that the equipment is simple and easy to repair, the continuous production performance is good, and the size of the molded blocks is stable and uniform. However, its disadvantages are also inevitable. The main disadvantage is that due to the effect of elastic after-effects, the upper part of the model blocks have certain connections, and the wear and poor contact of the model lead to some crushing and paste in production. When producing in small batches, due to changing product formulas, it is impossible to continue to pressurize, which can lead to poor molding in the last batch of products due to the lack of gravity of the upper products themselves.
