The relationship between the resistivity and maximum discharge of charged electrode paste during self baking electrode roasting
The relationship between the resistivity and maximum discharge of charged electrode paste during self baking electrode roasting is a complex but important technical issue, which involves the physical and chemical changes during electrode roasting, as well as various factors related to electrode production efficiency and quality. The following is a detailed analysis of this relationship:
1、 The variation law of electrical resistivity
Initial stage: In the early stage of roasting, when the temperature is below 200 ℃, the electrical resistivity of the electrode paste will increase due to the melting of the binder in the electrode paste. This is because the binder may form a liquid or semi-solid layer with poor conductivity during the melting process, leading to an increase in electrical resistivity.
Main decline stage: As the temperature continues to rise, especially when the temperature exceeds 400 ℃, a large amount of volatile matter in the electrode paste begins to be discharged, and the binder also undergoes thermal shrinkage reaction, generating asphalt coke with good conductivity. This process leads to a significant decrease in the resistivity of the electrode paste. At around 700 ℃, the resistivity can decrease by approximately 98%.
Stable stage: When the temperature further rises to above 800 ℃, the resistivity tends to stabilize, and most of the current is input into the furnace through the sintered electrodes. At this point, the electrode paste has been roasted into a dense electrode, and its electrical resistivity remains at a relatively low level.
2、 Factors to consider for maximum downward release
The influence of electrical resistivity: Electrical resistivity is one of the key factors determining the quality and efficiency of electrode roasting. Under low resistivity conditions, the conductivity of the electrode is better, which is conducive to heat transfer and electrode sintering. Therefore, in the stage of low electrical resistivity (such as when the temperature is above 400 ℃), it is appropriate to increase the downward discharge of the electrode to accelerate the sintering process of the electrode.
Consideration of electrode strength: Although increasing the amount of discharge can accelerate electrode sintering, the issue of electrode strength also needs to be considered. If the amount of discharge is too large, the electrode may fracture or deform during the sintering process due to insufficient strength. Therefore, when determining the maximum discharge amount, it is necessary to comprehensively consider factors such as electrical resistivity, electrode strength, and calcination time.
Optimization of process parameters: The electrical resistivity and maximum discharge amount of electrode paste are also influenced by process parameters such as batching, kneading, pressing, as well as the furnace atmosphere, pressure, heating rate, and final temperature of the roasting system. By optimizing these process parameters, the resistivity of the electrode paste can be further reduced and the sintering speed and strength of the electrode can be improved.
3、 Specific relationships
Based on the above analysis, the relationship between the resistivity of charged electrode paste during self baking and the maximum discharge amount can be summarized as follows: in the stage of low resistivity (such as when the temperature is above 400 ℃), the discharge amount of the electrode can be appropriately increased to accelerate the sintering process of the electrode; However, when determining the maximum discharge amount, multiple factors such as electrical resistivity, electrode strength, and process parameters need to be comprehensively considered.
Furthermore, it is worth noting that the resistivity and maximum discharge of the self baking electrode are not constant, but constantly change with the progress of the baking process. Therefore, in actual production, it is necessary to monitor and adjust the resistivity and maximum discharge amount in real time according to specific situations to ensure the baking quality and production efficiency of the electrodes.
In summary, the relationship between the resistivity of charged electrode paste and the maximum discharge amount during self baking electrode roasting is a dynamic equilibrium process that requires comprehensive consideration of multiple factors and real-time adjustment.
